Installation for processing water with ozone and methods of its dosing (versions)

FIELD: chemistry.

SUBSTANCE: group of inventions relates to technology of processing water with ozone and can be used in systems of water supply of towns and settlements for decontamination of drinking water from surface water sources, in particular, with large seasonal fluctuations of water contamination, requiring up to sixfold change of ozone dose. Ozone-air mixture is supplied by steps with constant consumption at each step and change of ozone concentration in ozone-air mixture. Ratio of maximal consumption of ozone-air mixture at the last step to minimal at the first step is taken equal to not more than 2. Dimensions of ozone-air mixture bubbles is from 0.8 to 1.2 mm. Device for processing water with ozone contains system of preparation of dried and cooled air, providing its supply into ozone and ozone-air mixture generator onto disperser in steps, as well as three separate lines of similar dispersers.

EFFECT: group of inventions provides reduction of loss of ozone produced by generator, efficiency of produced ozone application not lower than 95%, increased accuracy of ozone dosing, increased reliability of installation functioning and its safety.

12 cl, 14 dwg, 6 tbl

 

1. Brief description of the drawings diagrams schedules

Methods of dispensing ozone and installation are explained by the following drawings, diagrams, schedules:

Figure 1 shows a graph of the degree of absorption of ozone in water specific consumption of ozone-air mixture (OBC) through 1 cm2the working area of the porous plates of dispersants in two types: regular PA-2.1 with plates of porous titanium and experienced of porous glass filters SCHOTT). Tests were conducted in a modernized contact tank (CU) East of the water treatment station of Moscow with an improved scheme of flow of water in CU.

Figure 2 shows a graph of the degree of absorption of ozone in water specific consumption OBC through 1 cm2the working area of the porous plates of standard dispersant PA-2.1 CU staff.

Figure 3 shows the experimental dependence of the size of dispersed air bubbles from the pressure drop across the holes of dispersants at different normalized diameters of the holes 70, 80 and 100 microns.

Figure 4 shows the calculated and experimental dependence of the ozone absorption of water from the size of the bubbles at allied different depth of immersion of the plates dispersant in water CU: 4,5; 5,0; 5,5 m.

Figure 5 shows the experimental dependence of the specific consumption of OBC from the pressure drop across a single �twistie perforated plate dispersant 2 types: dispersant with a thin titanium plate with holes with a diameter of 70 μm and a dispersant AFD-270 with an elastic plate with slotted holes (slits).

Figure 6 shows the experimental dependence of the specific consumption of OBC through 1 cm2square porous plate dispersant of two types: standard dispersant PA-2.1 with a plate of porous titanium, experienced dispersant with filters SCHOTT.

Figure 7 shows the dependence of the ratio of the actual energy consumption for production of 1 kg of ozone to the minimum value from the ratio of the actual concentration of ozone in the OBC to the optimum value corresponding to the minimum energy consumption for production of 1 kg of ozone. The dependence obtained from the results of experimental determination of energy consumption in the pilot plant with the capacity of 25 kg of ozone per hour.

Figure 8 shows a graph of the 4-speed dependence of the flow rate of the OBC on the dose of ozone corresponding to the law of arithmetical progression with the consumption of treated water 10200 m3/h and a range of ozone dose from 1.25 to 4.27 g/m3.

Figure 9 shows a graph of the 3-position dependence of rate of OBC on the dose of ozone corresponding to the law of arithmetical progression with the consumption of treated water 13333 m3/h and a range of doses of ozone of 1.0 to 3.4 g/m3.

Figure 10 shows a graph of the 6-speed dependence of the flow rate of the OBC on the dose of ozone corresponding to the law of arithmetical progression for the installation costs of�Ohm treated water 10700 m 3/h and a range of doses of ozone of 1.0 to 6.0 g/m3three independent lines of dispersers in each CU. On the chart labels with arrows shows the three different parts of the full range of doses, where the dose is provided by the product of the selected ozone concentrations in SVG and flow of the EIA at this stage: the working range, the area overlapping with the range corresponding to low-speed flow of OER, and the reserve range, the minimum dose which corresponds to the minimum permissible concentration of ozone in OBC equal to 10 g/nm3.

Figure 11 shows the sequence diagram of change of total flow OBC, flow lines dispersant, the concentration of ozone in the OBC and the dose of ozone in water in time to install with three independent lines of dispersants, connected in series, with the consumption of treated water 10700 m3/h and a range of doses of ozone of 1.0 to 6.0 g/m3.

Figure 12 presents pneumatic-hydraulic installation scheme with multiple compressors of the same constant capacity in the training system of air. The figures are denoted by:

1 - the system of training of air, which includes a compressor 7, the device of the bypass air from the output to the input - 15; block dehumidifier - 8, a conduit for supplying air into the ozone generator with locking elements 84, gauges �of Alenia 10, 17 and air flow 11.

2 - ozone generator, comprising: a module ozone generator 16 with the cooling system, the power supply 17, a measure of the concentration of ozone in OBC 18.

3 - line submission of the OBC, which includes: a conduit 19, the pressure meter 21, the locking element 20, the automatic expansion device 22.

4 - pin reservoir, which comprises: a reaction tank 23, pipelines raw water supply 24, the drain treated water 25, dispersants OBC, which combined supply conduits 26, 27, 28 in three separate lines, communicate with a distribution manifold 29 is automatically controlled through the input inductors 30, 31, 32. The manifold is provided with a pressure gauge 34 and the concentration of 35. An outlet conduit conveying the manifold off OBC fitted with a valve element 36 and the filter 80 and the flow measuring device 33. CU has a sensor limit of ozone concentration sensor 55 and the residual ozone concentration in the gas cushion during normal working 56.

5 - the system of assignment of allied waste and destruction of residual ozone contains: pipeline of leads 57, the locking member 60, the exhaust fan 65, the destructor of residual ozone 64, the pressure meter 61 dilution in the gas cushion, the sensor maximum permissible concentration of ozone 66 release in OBC ATM�sphere, automatically adjustable throttle 62, the drain pipe 58 with additional mini-destructor residual ozone 59.

6 - purge system includes: main air duct 12, a low pressure compressor 81, the gear 82, the cooler 83, automatically adjustable throttle 14, the filter 79, the flow meter 45, a shut-off valve 51. The purge system further includes a distribution manifold 44, pressure gauge 46, on-off valves 48, 49, 50, the outputs of which are communicated with the outputs of the inductors 30, 31, 32 and lines of dispersants 26, 27, 28, and conduits 41, 42, 43 with cavities measuring the pressure drop across the dispersant 37, 38, 39, other measuring cavity which is communicated with a conduit 40 with a water array CU at the level of dispersants.

Figure 13 shows the pneumatic diagram of the setup with one adjustable compressor in the system of air preparation and air sampling purge air collector from the system. The remaining systems 2, 3, 4, 5 similar to the setup presented in figure 12.

1 - system purge air includes: high pressure compressor 7, cooler 8, the collector 76, the gear 77, the conduit for supplying air into the ozone generator 9 with the locking member 84, a pressure gauge 10 and air flow 11.

6 - purge system differs from that shown at f�góra 12 tubing air supply 12, which communicated with the collector 76 and is provided with a pressure meter air 78 and the gear 13.

Figure 14 shows a scheme of distribution pipelines between OBC dispersants separate lines in a single CU. The numbers on the diagram marked with: 19 - drainage OBC from the highway, 31, 32 - adjustable input chokes, 27, 28 - the supply piping, 91, 92-vertical supply piping, 85, 86 - bottom longitudinal distribution piping, 87 - the drain pipe, 88 - lateral pipelines, 89 - vertical tubes, 90 - dispersers, 53 - waste piping water seal.

2. Symbols, indices, abbreviations

G - flow ozone-air mixture, normal cubic meters per hour (nm3/h)

Q is the performance of the ozone generator, kg/h (g/h)

c is the ozone concentration in the ozone-air mixture, g/nm3

GH2O- the consumption of treated water, m /h

β - dose of ozone injected into water, g/m3

n - number of stages flow rate of the ozone-air mixture

N is the number of holes in the dispensers

Δp is the differential pressure of the ozone-air mixture into the bores of dispersants, kPa

max - maximum value

min - the minimum value

opt is the optimal value of the value

UD - specific value referred to 1 cm2surface area, or 1 hole�

mouth - mounted project value

ass - setpoint value

Teck - current in the given time value

Lyn - value of parameter assigned to a single line of dispensers

Tob - hole disperser

op - experienced

CU - contact tank

SVG - ozone-air mixture

DSU dispatch management system

The LAS - local management system

SST - system of air preparation

MTR - synthesis system ozone

ODS - system for lead-OBC and destruction of ozone

SAP - feeding system and dispersing OBC

3. Area of technology and analogues of the claimed installation

The invention relates to the treatment of water by ozone and can be used in particular for disinfection of drinking water in water supply systems of cities and settlements.

Known analogue of the claimed installation according to the destination and aggregate similar significant structural limitations.

This device contains: a system of training of air, connected to the ozone generator is equipped with a power source, a reaction vessel equipped with supply and discharge of treated water, and a dispersant ozone-air mixture disposed at the bottom of the tank and communicated with each other into a single unit connected t�webprovider with the ozone generator, wherein the dispersant is provided with porous plates with a pore size of 10~150 μm or plate with holes in the form of channels in the form of a truncated cone whose diameter at the inlet and outlet of the ozone-air mixture, respectively 180-200 μm, 100-150 μm, the processing system of excess ozone (Patent No. 2169122 C02F 1/78, publ. 20.06.2001).

A disadvantage of the known device is the presence in its composition of additional systems reduce the concentration of excess ozone in the volume of the gas cushion of the contact tank, which remains in an upward flow of bubbles of ozone-air mixture due to incomplete absorption of its water.

Method of increasing the degree of absorption of ozone in water in the known device is that the raw water is additionally dispersed in the volume of ozone-airbag contact tank containing residual ozone.

Additional device contains a variety of spray nozzles uniformly distributed in the volume of the gas cushion. It greatly complicates the design of the reaction vessel and increases the cost of manufacture and operation.

Without additional devices the degree of absorption of ozone in the known apparatus does not exceed 85-90%.

Also known installation for ozonation of water containing a generator of ozone-gas mixture, the contact tank with�Stamou water supply and drain device to a consumer in the bottom portion of which is mounted the gas-dispersing elements, connected by pipeline with the ozone generator. The gas-dispersing elements, configured as a hollow double-layer panels with evenly perforated top layer, stacked together without gaps with the formation of a closed space between the bottom layer of the panels and the bottom of the contact tank. Water can pass through the panels are provided in the sleeve. The gas-dispersing elements are provided with a twist knots of water flow in the form of a centrifugal nozzle, outlet nozzle which is designed as a circular slit, which is placed above the surface of the perforated layer of the panels and parallel, and the inlet nozzles communicating with the space beneath the panels and the water in the contact tank (Patent No. 2374184 C02F 1/00, publ. 2007).

The unit utilises a method of increasing the degree of absorption of ozone in water by forced separation bubbles of the ozone-gas mixture tangentially directed stream of water and reduce their size in comparison with the natural conditions of their separation.

The disadvantages of this setup is its lack of a device to regulate the flow of water through the nozzle, which is necessary for effective flushing of bubbles at different costs of ozone-gas mixture, �provide different doses of ozone in water.

Another disadvantage of this setup is the technical complexity of creating a backlash-free swivel joints between hollow-core panels that are installed on the entire floor area of the contact tank is $ 70...100 m2and subsequent operation of the equipment, including routine maintenance, including sanitation of the contact tank. There is a real gap between the panels and walls of the contact tank, much larger than the total area of flow section of slit nozzles, requires a significant additional increase of the pressure of the treated water in the space under the panels for the effective functioning of slit nozzles.

Differential water pressure on the nozzles ~of 0.05 kgf/cm2the load on the bottom of the hollow panel and the connections between them based Archimedean buoyancy force is about 45-50 T. this raises additional problems in ensuring the strength of hollow panels and nodes of intersection between them.

In the first known from the above, analogues of the installation of ozonation efficiency in the use of ozone is increased by secondary use of residual ozone in the gas cushion, and the second by the effect of water jet on the natural process of dispersing bubbles of ozone-air mixture.

4. Results�ATA experimental research of influence of various factors on the efficiency of utilization of produced ozone

To establish the main physical factor of the process of dispersion of the ozone-air mixture, affecting the degree of absorption of ozone water with the participation of the authors of the present invention, the comparison tests of the upgraded and standard systems of the dispersion of the ozone-air mixture on an industrial scale in the Eastern water treatment plant in Moscow ["Report on the results of comparative tests of the upgraded and standard systems of the dispersion of the ozone-air mixture in the contact tank No. 8 and No. 10 East waterworks Moscow", JSC "Moscow ozonizer, 2004]. Conditions and results of these tests are given in Tables 1 and 2 and Figures 1 and 2. The degree of absorption of ozone in water was determined by the concentration of residual ozone in the gas cushion and experienced staff contact tanks.

From consideration of these results follows that for the same type of dispersants with porous plates of titanium powder with a pore size of 40...120 μm, installed in a regular and experienced tanks, the degree of absorption of ozone water essentially depends on the value of specific consumption of ozone-air mixture per 1 cm2square porous plate of a dispersant. In experienced contact tank at the specific consumption of ozone-air mixture ~ 1 nl/h at 1 cm the square plate was obtained the degree of absorption of ozone 96-99,5%. In normal (control) contact the tank when you change the specific consumption of 1 cm2square from 2 to 8 nl/h, the utilization ratio (absorption) of ozone is significantly lower 92-85%.

However, note also that the depth of immersion of the dispersant in the experimental tank was 3.5 m, then as in the standard 4.5 m, which is 28% larger. Filters from SCHOTT glass powder with a porosity of 100 microns, tested in the experimental tank, provided the degree of absorption of ozone water 96-97% in the specific consumption of 1 cm2the square from 1 to 3 nl/h.

One of the disadvantages of porous plates dispersant, obtained by sintering particles of the titanium powder or glass, is a big difference in size, through pores formed in a single wafer or in different wafers. The result is a large variation of the magnitude of the airflow to 150-200% at the same values of pressure drop, which greatly complicates the configuration of such dispersant in a bloc with common supply pressure of the ozone-air mixture.

Minimum spread flow-pressure characteristics are plates of sheet titanium normalized with holes made using laser technology.

Were produced�hree and tested in the laboratory model disk dispersers with a diameter of 290 mm with titanium plates with thickness 0.4-0.5 mm, in which the laser were 1500 made holes with a diameter of 70±5 μm. The test result was obtained the dependence of the specific air flow rate from differential pressure at a depth of dispersant 5 m, the approximation of which is represented by the following dependency

where- specific consumption of air through one of the normalized hole, normal cubic meters per hour (nm3/h);

ΔP is the differential pressure of air between the inlet opening and the exit from it into the water, kPa;

ΔP0=3 kPa critical pressure drop of the air hole, wherein the air flow rate is 0;

kcp=0,52·10-3- experimental coefficient of proportionality that depends on the actual average value of the diameter of the holes in the plate and the discharge coefficient. The variance from the average of the 10 tested the plates is ±15%.

Laboratory tests were also obtained dependence of the sizes of the bubbles from the pressure drop holes ⌀70, 80 and 100 μm. The results are presented in Figure 3.

Dependence of ozone absorption on the size of bubbles obtained in [Ozone and other environment friendly oxidants. Science and technology. Publishing house "University and school", 2004], shown in Figure 4.

From a comparison of the dependences R�Alannah Figure 3 and Figure 4, it follows that the degree of absorption of ozone over 95% can be obtained when the sizes of the bubbles from 0.8 to 1.2 mm. Dispersion of the bubbles through the normalized hole diameter of 70±5 μm can be achieved at a pressure drop of from 4 to 6.5 kPa. According to the formula (1) specific consumption will be:

Thus, when using the proposed installation of dispersants with perforated laser normalized hole diameter of 70±5 μm, the degree of absorption of ozone water to more than 95% can be obtained in the range of the differential pressure of the ozone-air mixture from 4 to 6.5 kPa, the specific flow rate through a single hole is from 0.52 to 0.97 nl/h or from 145 to 270 NMM3/S.

From the practice of using a dispersing device for the purification of water known dispersers type AFD-270 allowing for periodic flow ozone-air mixture into the water and having an elastic membrane made of synthetic rubber with a slit-like self-cleaning when Sadducee holes at a pressure drop of ~2 kPa dispersed bubbles of about 1 mm.

Characteristics of four types of dispersants with perforated and porous plates, which can ensure the degree of absorption of ozone water to more than 95%, are shown in Table 3, and Figures 5 and 6 show the graphs of Adelino� of flow rate from differential pressure.

5. The technical problem of the invention and variants of how to resolve it

Establishing the main factor influencing the extent of absorption of ozone water treatment equipment ozone water, allows to formulate the technical problem of the invention.

It consists in the elimination of the contradiction between the need of increasing the total flow rate of the ozone-air mixture to achieve a given dose of ozone in water and the necessity of limiting the value of specific consumption of ozone-air mixture through the holes of dispersants to ensure a high degree of absorption of ozone water, for example, not less than 95%.

The dose of ozone, water introduced into the contact tank, is determined by the formula:

where β is the dose of ozone, g/m3;

with the ozone concentration in the ozone-air mixture, g/nm3;

G - flow ozone-air mixture, nm3/h;

GH2O- water flow, m3/h.

At a constant flow of water, regulation of ozone dose in the automatic operation mode, the installation will be done in three different ways:

1. by changing only the concentration C at a given constant total and specific consumption of using dispersants;

2. by changing the common and specific consumption of using dispersants in the acceptable range at a constant, for example, the optimal concentration C;

3. combined method: by a gradual natural changes in flow rate G while maintaining a constant level in each degree and concentration changes with in a certain range at each stage of the expenditure G.

A positive feature of the first method is that is saved when you select a sufficiently large number of holes in the dispersants of the constancy of the low value of the specific consumption of ozone-air mixture, ensuring a high degree of absorption of ozone water. A significant disadvantage is economic inefficiency of conducting the process of ozonation at a constant maximum flow ozone-air mixture, which is required for maximum ozone dose, and the reduction of ozone concentration in the ozone-air mixture to low doses of ozone associated with an increase in energy consumption for production of 1 kg of ozone.

Experimental dependence of the total energy consumption on the concentration of ozone for a pilot plant with the capacity of 25 kg of ozone per hour is shown in Figure 7. On the abscissa axis shows the value of the ratio of sold to optimal concentration, the ordinate the value of the ratio of actual energy consumption to the minimum�th value the corresponding optimal concentration.

The dependence of the relative value of energy consumption on the ratio of the maximum prescribed dose of ozone to a minimum by adjusting the dose of ozone by changing the concentration shown in Table 4.

From Table 4 it follows that ifenergy costs increase by 10%, with

Increasing the degree of absorption of ozone water in this way the ozone dosage by 5-10% increases energy consumption for ozone production by 10-20%. In this regard, its use is impractical.

The second method of regulating the dose of ozone by proportional changes in the flow of the ozone-air mixture at a constant optimal concentration of the ozone is used in French install water ozonation installed on Rublevsky water treatment station of Moscow. The plant comprises an air compressor with infinitely variable performance 3.5-4 times. This method ensures the minimum energy consumption for production of 1 kg of ozone. However, the degree of absorption of ozone in water not less than 95% can be realized by increasing the minimum dose is not more than 2 times.

An acceptable solution of the technical problem can provide a third of the proposed combined FPIC�b dosing of ozone, where in the different time periods of operation of the plant water ozonation, ozone-air mixture is passed through various dispersants steps at a constant rate, and the change in dose at each stage provide a change in the ozone concentration in the ozone-air mixture within acceptable limits.

5.1. Description the 1st method of dosing

The first version of the proposed combined method of dosing of ozone in drinking water treatment, including the preparation of compressed, cooled and dehumidified atmospheric air, the air passing with a given flow rate through the ozone generator with power supply, ozone synthesis with specific concentrations of ozone in the ozone-air mixture, passing the ozone-air mixture through the apertures of the dispersant with the release of them upward flow of small bubbles in the volume of treated water, flowing through the reaction capacity of the contact tank with a certain dose of ozone in each of them by distributing the total flow rate of the ozone-air mixture between the contact tanks is proportional to the flow rate of water in each of them, the disposal of waste ozone-air mixture from the gas cushions of the contact tanks at the destructor of the residual ozone with subsequent emission of ozone-air mixture with a safe concentration in �her of ozone in the atmosphere, significantly different from the closest analogue of the fact that in different time periods of operation of the installation of ozone treatment water ozone-air mixture was passed through a dispersant different stages at a constant rate, and the required dose at each stage provide a change in the ozone concentration in the ozone-air mixture in the range from 70 to 120% of the optimal concentration corresponding to the minimum energy consumption for production of 1 kg of ozone and characteristic of used ozonizer unit, and the ratio of the maximum specific consumption of ozone-air mixture at the last stage to a minimum at first taken to be no more than 2, the continuous change in ozone dose at the junction of the degrees of the flow rate of the ozone-air mixture by entering the boundaries of each range of doses at the boundary of the adjacent at least 15% of the value range, for example, in the transition to a higher level of consumption OBC minimum working dose of ozone it is selected in magnitude than the maximum working dose of the previous lower level, and the margin in the 15% refers to the entire operating range corresponding to a higher level of consumption. An example of combining ranges are shown in figure 10, and the size of the bubbles of ozone-air mixture from 0.8 to 1.2 mm, provided�ment the degree of absorption of ozone in water in the range of more than 95%, receive by passing an ozone-air mixture through either a thin thickness 0.4-0.5 mm perforated plate dispersant titanium, in which the holes are made by laser firmware, and the average diameter of the holes is set in the range of 65 to 75 μm, and the diameter of any aperture in the range of 60 to 80 µm, the total number of holes in the dispersant and the minimum differential pressure of the ozone-air mixture in the holes is chosen based on the conditions of passage of the dispersants of the specified minimum flow rate of the ozone-air mixture with an average value of the specific volume flow through one hole, is $ 145±15 NMM3(normal mm3in h), or ozone-air mixture was passed through a disperser with a porous plate with a thickness of 3-4 mm, produced by sintering titanium powder with a porosity of 45% to 50% and the size of the through pores of 40 to 120 μm, and the total working area of the plates and the maximum differential pressure of the ozone-air mixture on the plates is chosen according to the conditions of passage of the dispersants of the specified minimum flow rate of the ozone-air mixture with an average value of the specific flow rate through 1 cm2the plate area of the dispersant is equal to 290±30 NMM3second the chosen level of consumption of ozone-air mixture and the concentration values of ozone produces the corresponding�following block software dispatch system automatically control the operation of the installation of ozonation of water which calculates a predetermined current performance of the ozone generator according to the following formula:

where Q is the performance of the ozone generator, kg/h;

β - dose of ozone in water, g/m3;

GH2O- water flow, m3/h;

ε1- the actual degree of absorption of ozone water, which is set according to the results of pre-commissioning works;

ε2- coefficient of ozone losses during transportation of ozone-air mixture from the ozone generator to the dispersants,

and sets the suitable level of consumption at which the following condition holds:

calculates the current value of ozone concentration in the ozone-air mixture by the formula:

where n is the sequence number of rate steps;

then issues messages in the local automatic control system (LAS) block of air preparation, ozone generator and dispersion of the ozone-air mixture on the selected level of air flow and in the LAS ozone generator of the required concentration of ozone and receiving a message from the LASA's readiness for launch, launching the installation according to the accepted timeline, when you go on stage with a high consumption of ozone-air mixture increases the disclosure valves chokes installed at the entrance of the Department�tion lines dispersant, and the pressure drop across the holes and serves extra air into the ozone generator and additional ozone-air mixture of the dispersant, the amount of electric power supply of the ozone generator shall retain, and the ozone concentration is thus reduced by increasing the airflow, so cherish for 3-5 minutes, the dose of ozone level degree, and then, after the establishment of a stationary process, increase concentration, providing a given dose at a new stage of consumption of ozone-air mixture adjusted in the range of 5-10% the level of consumption of ozone-air mixture at the operating stage, the maximum power of the generator and the dose of ozone get to the last stage of consumption of ozone-air mixture at the highest concentrations of ozone equal to 1.2 coptand the minimum on the first stage when the minimum concentration equivalent to 0.7 coptwith largest the saleable value of the ratio of the maximum dose to the minimum determined by the formula:

Given the cost of ozone-air mixture at the selected speed provide by positioning valves chokes installed in the supply piping of the contact tank prior to the individual groups of dispersants.

Signs, kharakterizuyushchiisya only in special cases:

1) the pressure of the ozone-air mixture before it chokes on all the steps of the flow is maintained at the same level, by changing hydrocortisone additional throttle installed on the supply line of the ozone-air mixture, a compensating change in pressure loss of the ozone-air mixture in the network by adjusting the flow rate;

2) the same type dispersants of the ozone-air mixture in the contact tank are combined in three separate lines managed with auxiliary input choke, which provide the required excess reserve disclosure flaps, and use it in case of malfunction of one of the lines of dispersants or by reducing the bandwidth of the holes of dispersants for mineral or biological fouling in the ozonation of water increasing the pressure drop across the holes to the maximum, and achieve the required flow rate of the ozone-air mixture and dose of ozone;

3) for pre-compression of atmospheric air use several axial compressors low pressure (from 1.8 to 2.1 kgf/cm2) with the same constant level of performance, consistently include the work of one compressor to provide a step change in flow rate of air into the ozone generator in accordance with the law of arithmetical progression:

where n is the sequence number of rate steps;

Gn- the consumption of degree n, nm3/h;

d - difference of the progression is equal to the performance of a compressor;

G1=m1·d - flow at 1st stage, nm3/h;

m1- the number of compressors used on the first stage of consumption,

in this case, the ratio of air flow rate on the last stage of consumption at first taken to be 2 and the maximum required number of compressors - mmaxand-speed airflow - nmaxdetermined by the formulas:

mmax=2·m1,

nmax=m1+1.

An example of stepwise dependence of rate of the ozone-air mixture from the ozone dose applied to the law of arithmetical progression, shown in Figure 8;

4) for pre-compression of atmospheric air using at least one working compressor high pressure, for example, 7 to 10 kgf/cm2periodic action with access to the air collector (receiver), provided at the output of the reducer automatically maintaining the air pressure at the exit from it into the network, for example, in the range from 1.8 to 2.1 kgf/cm2when you change the consumption in the network up to 2 times, the selection of air from the receiver and the ozone-air mixture from the ozone generator to produce dispersants steps with flow rate in accordance with the law of geometries�Oh progression:

Gn=G1·qn-1nm3/h

where Gn- the charge on the n-th stage;

G1- flow at 1st stage;

n - number of rate steps;

q is the denominator of progression;

the ratio of the maximum flow rate of the ozone-air mixture to the final stage - Gnkto the minimum flow rate at the first G1take equal 2, and the denominator of progression - q is determined depending on the number of stages flow rate by the formula:

possible the recommended number of steps 3 or 4, wherein the maximum available dose of ozone at each stage of the flow of OER is determined by the formulas:

5.2. Description the 2nd method of dosing

For surface sources of treated water with large seasonal fluctuations in the ozone dose required for its high-quality cleaning, for example, 4-6 times set by the invention the task is solved in that in the second embodiment, a combined method of dispensing of ozone, including the preparation of compressed, cooled and dehumidified atmospheric air, the air passing with a given flow rate through the ozone generator with power supply, ozone synthesis with specific concentrations of ozone in the ozone-air mixture, passing the ozone-air mixture through the apertures of dispersant�in with the release of them upward flow of small bubbles in the volume of treated water, flowing through the reaction capacity of the contact tank with a certain dose of ozone in each of them by distributing the total flow rate of the ozone-air mixture between the contact tanks is proportional to the flow rate of water in each of them, the disposal of waste ozone-air mixture from the gas cushions of the contact tanks at the destructor of the residual ozone with subsequent emission of ozone-air mixture with a safe concentration of ozone in the atmosphere, for dispersing the ozone-air mixture in the contact tank using three separate controlled independently on the consumption of ozone-air mixture line of dispersants, allowing periodic transmission of the ozone-air mixture without the loss of bandwidth due to their mineral and biological fouling of the holes during idle periods that use perforated plate made of ozone-resistant elastomeric ethylene propylene rubber stamps EPDM molded with deposited on the outer surface of the plate with a release coating of Teflon with a lot of cross-slot, self-cleaning drop-down and pulling plates from the pressure of the ozone-air mixture supplied into the cavity of a dispersant, and upon release of pressure closing under water pressure, ensuring waterproof�lichnosti, moreover, the dispersants have a linear dependence of the specific consumption of ozone-air mixture through one drop down the hole from the pressure drop in the form:

where- specific consumption of ozone-air mixture through 1 slot, nl/h/1 resp;

Δ - pressure drop, kPa;

kop≈0,5±0,05 experimental coefficient,

the compressed air for ozone synthesis proizvodjac of air collector system of training of air, and depending on the magnitude of the dose range of ozone in water, the selection of produce at a rate corresponding one of the six prescribed steps, each of which the flow rate of the ozone-air mixture corresponds to the following law of arithmetical progression:

where n is the ordinal number of the stage;

- the total number of holes in the dispersants single line;

- the minimum value of the prescribed doses of ozone in water;

copt- the optimal concentration of ozone in the ozone-air mixture;

- a predetermined flow of water to be treated;

- the minimum value of specific consumption of ozone-air mixture through a single slot of a dispersant, taking is 0.45 nl/h or 125±13 NMM3a /C, p�and the same time to increase the minimum ozone dose not more than 6 times the 1st and 2nd stage flow rate used for the passage of the ozone-air mixture through one line of dispersants, 3-th and 4-th stages for simultaneous synchronous operation of two lines of a dispersant and 5-th and 6-th stages for simultaneous synchronous operation of the three lines.

The allowable range of variation of ozone concentration in the ozone-air mixture at each stage of the flow rate selected from 0.7 coptto 1.2 copt.

Continuous variation of ozone dose in the transition to the next stage of the flow rate of the ozone-air mixture by the use of routes of the boundaries of each plot ranges of doses at the boundary of the adjacent area not less than 15% of the value of the dose range, for example, in the transition to a higher level of consumption of ozone-air mixture. Minimum working dose it is selected in magnitude than the maximum working dose of the previous lower level, and the margin in the 15% refers to the entire operating range corresponding to a higher level of consumption.

Example 6-speed dependence of the flow rate of the ozone-air mixture is shown in Figure 10, which shows the location of overlay zones ranges of doses, and table 5 shows the distribution of rate steps and ranges of ozone dose on separate lines of dispersants. These data show that increasing the dose of ozone is provided 6 times the increase in minimum flow rate of the ozone-air mixture through one line 1.5 times and Uwe�Iconium ozone concentration in the ozone-air mixture, 1.7 times the summation of costs over the lines. For comparison, when skipping the ozone-air mixture simultaneously through all lines of dispersants increase the dose of ozone 6 times requires a similar increase flow on each line in 3.5 times. However, this increase in the specific flow rate through the holes dispersant absorption of ozone water will not exceed 85%.

The consumption of OBC on the selected speed is maintained at a predetermined level by setting the corresponding position of the dampers input chokes separate lines dispersant, wherein all the degrees of consumption is maintained at the same level as the allied pressure before the throttle by changing hydrocortisone additional throttle installed on the supply line allied to all the contact tank installation.

Regulation of the current value of the ozone dose - βnat a constant flow ozone-air mixture at the chosen level is carried out by changing the concentration of ozone within the established from cmin≥0,7 coptto cmax≤1,2·coptwhile

The chosen level of consumption number of working lines dispersant and the concentration of ozone in the ozone-air mixture provides the corresponding block software dispatch system automatic control R�botoi installation which calculates the current required performance of the ozone generator according to the following formula:

where Q is the performance of the ozone generator, kg/h;

β - dose of ozone in water, g/m3;

- water flow, m3/h;

ε1- the actual degree of absorption of ozone in water, determined by the results of pre-commissioning works;

ε2- coefficient of ozone loss due to decomposition during transportation of ozone-air mixture from the ozone generator to the dispersants,

and sets the related rate steps, on which the following condition holds:

calculates for each step of a desired value of the current ozone concentration in the ozone-air mixture by the formula:

and chooses the level of consumption with a minimum difference between the desired concentration and optimal and provide messages to the local system of automatic control of unit air preparation, ozone generator and dispersion of the ozone-air mixture on the chosen level of consumption rooms and working lines dispersant, and a local control system ozone generator is additionally on the desired concentration of ozone; runs-in components according to the established timeline and displays it on set�visa specified operation.

When you receive a new job at increasing ozone dose, which does not require connection of additional line of dispersants, and only change to a great degree of consumption of the EIA, the local control system of the dispersion process at the command of the DAC increases synchronously communicating sections of the input chokes existing lines, making the selection of air from the air collector system of air preparation with the desired total flow rate, and local control system synthesis of ozone on command DSU changes the concentration of ozone in SVG, achieving the desired performance of the ozone generator and ozone dose in water.

If necessary, connect an additional line of dispersants, with the team DSU of the local control system of the first dispersion process issues a command to the synchronous decrease of the flow section chokes existing lines and increasing the passage section of throttle input plug line, achieving first save consumption of ozone-air mixture and the adjustment shares flow rate using the meter pressure drop through the lines, and then to a synchronous increase in flow cross-sections of the throttles together existing lines, seeking to establish the desired total flow rate of the ozone-air mixture, and then local system synthesis ozone� team crushing and screening plant increases the concentration of ozone in the ozone-air mixture, achieving the desired value of the generator's performance and the dose of ozone.

An example timeline of changes in the total consumption of ozone-air mixture, flow lines dispersant, the concentration of ozone in the ozone-air mixture and dose of ozone in water in different time periods of operation of the installation shown in Figure 11.

If a fault occurs in one of the lines dispersant use under power reserve valves chokes serviceable lines and increasing the differential pressure of the ozone-air mixture within the permissible limit seeking to restore the required flow rate and ozone dose.

6. Installation for water treatment by ozone

6.1. Description of the design

Delivered to the invention the problem of increasing the efficiency of the use of ozone produced by increasing the degree of absorption of ozone water in the reaction vessel CU by implementing the claimed method of dispensing ozone and additional task consists in increasing the accuracy of dosing ozone, reliability of the installation and its ozonobezopastny, is solved in that the proposed water treatment plant ozone, containing a system of training of air, comprising a compressor unit, dehumidifier, chiller, system synthesis of ozone, including ozone generator with power supply, contact tanks with�Stamou feed transmission and drain the water to the consumer, supply system, distribution and dispersion of the ozone-air mixture containing the main pipeline which communicates with the ozone generator and with taps on the contact tanks, dispersing bubbles of ozone-air mixture evenly placed in a natural part of the contact tank on the feed conduits which communicate with branches from the main pipeline and the ozone generator, the system of disposal of waste ozone-air mixture from the gas cushions of the contact tanks, destruction of residual ozone and emissions mix in the atmosphere, the system of automatic control with shut-off and regulating and control devices, according to gas hydraulic circuits, shown in Fig.12 and Fig.13, differs by the following combination of structural features that provide the claimed technical effect:

- preparation system with dry air includes 1 or several similar axial compressors 7 low pressure in the range from 1.8 to 2.1 kgf/cm2(Fig.12) with the same constant level of performance, the device of the bypass air 15 from the output of the compressor to the input used when starting the compressors and the air consumption in the network, the unit dehumidifier 8, the pipe feeding the air 9 into the generator Ozo�and 2 weekends with the locking member 84, pressure gauges 10 and flow 11, or includes at least one working compressor 7 (Fig.13) high-pressure 7 to 10 kgf/cm2periodic action with access to the air collector (receiver) 76, provided on the output gear 77, automatically maintaining the air pressure at the output of the network in the range from 1.8 to 2.1 kgf/cm2when you change the consumption in the network, the cooler 8, the pipe feeding the air 9 in the ozone generator 2 weekends with the locking member 84, pressure gauges 10 and flow 11.

The consistent inclusion of multiple compressors of equal performance provides described manner prescribed dosage of ozone, a step change total flow rate of the ozone-air mixture according to the law of arithmetical progression with difference equal to the performance of a compressor.

The presence of air collector in an alternative solution to enable sampling of air and the flow of the EIA for the dispersant to be based on any predetermined law, for example, under the law of an arithmetic progression with constant step or the law of geometrical progression with variable pitch by changing the flow area of the inductors 30, 31, 32, installed at the entrance in a single line of dispersants 26, 27, 28.

- ozone generator 2 includes four modules of the ozone generator 16 Rav�Oh performance with cooling system, the power supply modules 17, measuring the ozone concentration in the ozone-air mixture 18;

- the inlet of the ozone-air mixture 3 includes a conduit 19, which bends to the contact tank mounted pressure gauge 21, the locking element 20 and the automatic expansion device 22 with the possibility of maintaining the level of the feed pressure by compensating the change of pressure loss in the regulation of the flow rate of the ozone-air mixture, as well as to maintain the feed pressure in the contact tank at the level at which you ran the calibration dependence of the flow rate from stroke valves chokes 30, 31, 32;

pin the tank 4 contains: reaction vessel 23, pipelines raw water supply 24, the drain treated water to the consumer 25, the same type of dispersants ozone-air mixture, which combined supply conduits 26, 27, 28 in three separate lines, communicate with a distribution manifold 29 through the input inductors 30, 31, 32 with automatic variable area flow area, the maximum value of which is selected in 3÷4 times more than the total flow area of the holes in the plates dispersant separate line; and a distribution manifold 29 is communicated with the highway 19 bypass pipe fitted with a valve Elementum, fine filter 80 traps particles larger than 20 microns, and the flow measuring device 33, which are located in front of the manifold 29 and the manifold is provided with pressure gauges 34 and ozone 35. Three separate controlled independently of the line of dispersants in conjunction with the stock maximum flow cross section area of the input chokes allow to increase the reliability of the system dispersion by increasing the flow rate of the ozone-air mixture through two lines if a fault occurs in the third, and by reducing the bandwidth of all lines due to mineral and biological overgrowing of holes required flow rate of the ozone-air mixture was maintained through increases in the acceptable range of pressure drop across the dispersant.

- in the individual lines of dispersants, functioning together with equal costs of the EIA, if the increase in ozone dose not more than 3÷4 times (1 a method of dispensing ozone) can be either the same type dispersants with titanium plates with a thickness of 0.4÷0.5 mm, perforated by laser with an average diameter holes component in the party line of dispersants in the range of 65 to 75 microns in diameter of any hole from 60 to 80 μm, or similar dispersing agents with porous titanium plates with thickness of 3÷4 mm, manufactured by sintering of titanium powder � sizes of through pores from 40 to 120 microns in a single dispersant. The total number of holes in perforated laser plates with a hole diameter of 75±5 μm are chosen to provide a minimum prescribed dose of ozone in water at a minimum concentration of ozone in the ozone-air mixture equal to 70% of the optimal concentration and the average specific consumption of ozone-air mixture through 1 hole, equal to (145±15)·NMM3and defined by the formula:

where- installed minimum dose of ozone in water, g/m3

- the set flow rate of treated water, m3/h

withSSE- the optimal ozone concentration, g/nm3;

- minimum specific consumption OBC through one hole in the perforated plate, the magnitude of the specific flow rate can be determined from the experimental dependence of the pressure drop:

where Δp is the pressure drop across the holes, kPa;

Δpo=3 kPa critical pressure drop, corresponding to zero flow of OBC.

Taking Δpmin=4 kPa, that is 33% larger than the critical value, we obtain

The total working area of porous plates dispersant with a pore size of from 40 to 120 microns selected from the conditions:

where- minimum specific consumption OBC through 1 cm2the plate area,

the magnitude of the specific flow rate can be determined from the experimental dependence of the pressure drop:

where Δpo≈1 kPa.

Taking Δpmin≥1,15 kPa, we get:

Thus, the total working area of the porous plates dispersant three lines are chosen to provide a minimum prescribed dose of ozone in water at a minimum concentration of ozone in the ozone-air mixture equal to 70% of the optimal concentration corresponding to the minimum energy consumption for production of 1 kg of ozone used ozone treatment plants, and the average specific consumption of ozone-air mixture through a 1 cm2the working area of the plates, equal

In the individual lines of dispersants, operating in conditions consistent inclusion in the work, provided the required increase in the dose no less than 6 times (2nd method of dispensing ozone), dispersants include periodic action with plates made of ozone-resistant elastomeric synthetic ethylene-propylene rubber stamps EPDM, molded, coated�depended on the external surface of the plate with a release coating of Teflon with a set of through slots, the drop in tension plates of the internal pressure of the EIA, and upon release of pressure, closing under water pressure to ensure a tight seal.

The total number of through slits in the dispersants of each of the three lines selected from the conditions:

the magnitude of the specific flow rate through one through slot can be determined from the experimental dependence of the pressure drop:

where Δ=1 kPa.

Taking Δpmin=2 kPa obtained

Based on the data in table 3, to ensure the degree of absorption of ozone is not less than 95% permissible increase in the specific consumption of using dispersants may be made no more than 1.5÷2 times.

- contact tank 4 is further provided with a purge system of air 6 lines of dispersants for the purpose of excluding water and control reduce the bandwidth of the holes of dispersants. The purge system 6 includes: main air duct 12 (Fig.12, 13), who reported either a collector (receiver) 76 system of air preparation and contains additional gear 13 that is configured to maintain the pressure level at the output of the network in the range from 1.8 to 2.1 kgf/cm2or communicated with a separate additional compressor low�about pressure (1,8÷2,1 kgf/cm 2) 81 (figs.13) type Kaeser compressoren made in Germany, equipped with a device 82 to maintain a constant pressure in the network and cooler 83 at the output of the network, and the main air duct 12 is provided with: a throttle 14, automatically regulating a predetermined flow of air, fine filter 79 traps particles larger than 20 microns, the flow measuring device 45 and a shut-off valve 51, the output of which is communicated with the reservoir OBC 29 the reaction vessel 23. Drain water displaced from the lines of the dispensers 26, 27, 28 is made in CU water through the valves 52, 53, 54, installed in places of the greatest lowering of pipelines drain, wherein the seal is made in the form of two vertical pipes with a rounded crosspiece at the top, the upper point of which is located at 30÷50 mm above the horizon of the location of plates dispersant, open end of the discharge pipe of the trap is lowered into the water CU to a depth of, e.g., 2±0,05 m below the plates of dispersants at depth of their dives 5±0.1 m, this permits operation of the water seal when the pressure of the OBC in the cavity of dispersants equal to 0.2 kgf/cm2or 2 m of the water column, and entry into the water seal is communicated with the cavity of the pipe line of dispersants in place of their greatest lowering to the floor CU.

The air supply system is further provided with a distribution manifold 44C three outlets, the output of each of which is communicated with the outlet ports 30, 31, 32 corresponding line of dispersants 26, 27, 28, and at the entrance to the allotments is installed shut-off valves 48, 49, 50 automatic actions with the possibility of air supply to alternating current control capacity reduction holes dispersant separate line with the regular work of others to OBC, wherein the contact tank is equipped with three gauges 37, 38, 39 of the pressure drop across the dispersant, one measuring cavity which is communicated with a water array on the horizon plates dispersant, and the other with a corresponding branch from the additional distribution header.

Reaction vessel 23 of the contact tank is provided with a system control the concentration of residual ozone in the gas cushion comprising a sensor for maximum permissible concentrations of ozone 55, according to the testimony which is given the permission to enter inside the contact tank service personnel, and the residual concentration sensor 56 when the contact tank at steady-state regular mode. Sampling OBC is directly above the water level in the contact tank. The sensor 56 is used to periodically monitor the actual extent of absorption of ozone water εfactWhy use a formula:

where CRef- the initial concentration of ozone measured by the sensor 35 at the inlet of the contact tank, g/nm3;

WithOST- residual concentration measured by the sensor 56, g/nm3.

By controlling the concentration of residual ozone in the gas cushion is possible to determine the presence of abnormal situations caused, for example, depressurization of pipelines distribution OBC, cavities dispersant, attachment sites dispersers, leading to coarsening of bubbles EOD and increase the "leakage" of ozone gas in the pillow.

- system for lead allied waste gas from the pillows CU and destruction of residual ozone 5 (Fig.12, 13) comprises a conduit leads 57, the locking member 60, the exhaust fan 65, the destructor of residual ozone 64, pressure sensor 61 dilution in the gas cushion, the MPC sensor in the emissions 66, and optionally, the throttle 62, the area of flow section is automatically adjustable according to the testimony of the vacuum sensor 61. The presence of inductors 62 on all CU, communicated between highway leads 63, ensures the pressure of the dilution gas in the pillows within a narrow range, for example, from 50 to 150 mm of water. article necessary to maintain the integrity of the ceiling of the CD.

Emergency drain pipe 58, indicating the volume of the gas cushion with the atmosphere�feroy in case of abnormal pressure rise OBC, additionally mounted destructor residual ozone 59, which increases ozonobezopastny release of the OBC in the atmosphere;

the dispersants can be made in the form of hollow panels with perforated top wall with a length to width ratio from 5:1 to 6:1, while panels in the contact tank installed in rows so that the longitudinal axis of symmetry of the panels parallel to each other, and separate panel lines alternate in the same sequence, and between the rows of panels are provided passages for maintenance; attachment of panels to power nozzles made with the possibility of rotation of the panels in the horizontal plane, with the plane of rotation of panel dispersants individual lines are shifted vertically by an amount greater thickness of the panels; either made in the form of hollow discs and are integrated in a compact group one dispersant from each line with equal distances between the centers with the formation of free passes, sufficient for installation and maintenance during operation;

- the pipeline feeding the ozone-air mixture dispersants individual lines can be configured in a rectangular lattice (Fig.14) mounted on supports at the bottom of the contact tank with a gap relative to the walls, and contains two longitudinal distribution piping 85 86, located on the same horizon at the walls and one drain 87 midway between the walls on the lower level, several lateral pipelines 83 with the vertical pipes 89 and mounted with dispersants 90 and communicated with a drain and distribution pipelines, while the drain pipe is made downwardly from the transverse walls to the middle contact of the reservoir and the site of maximum drawdown to him docked a discharge pipe 52, 53, 54 in the form of two vertical pipes with a rounded crosspiece at the top, the upper point of which is located above the horizon of the plates of the dispersants of this individual line, the open end of the discharge pipe is lowered into the water in the contact tank to a depth of, e.g., 2±0.05 m below the horizon of the plates of dispersants, which corresponds to the permissible excess pressure in the cavities of dispersants equal to 0.2 kgf/cm2or 2 m of the water column, and to the middle of each longitudinal distribution piping docked vertical pipes 91, 92, which, under the ceiling of the contact tank coupled to the conduit 27 which communicates with the outlet ports 31.

Each individual line of dispersants is provided with a protection device against abnormal increase in pressure of the OBC in the form of a water seal, the inlet of which communicates with the supply pipe line Mgr�of Gutorov, and the output of the discharge pipe communicated with a water contact array of the reservoir at a level located below the horizon plates dispersant in an amount corresponding to the allowable differential pressure OVS holes on the dispersant, expressed in m water column.

The proposed construction of a pipeline that feeds the dispersants separate line, provides the necessary uniformity of loading all of dispersants line. Provided the slope of pipelines to the middle contact of the tank and the presence of the discharge pipeline ensure complete removal of water from the system by blowing air, and in case of abnormal increase of the feed pressure of the ozone-air mixture discharge tubing works as a water seal and prevents the destruction of dispersants, which increases the reliability of the installation.

6.2. Example of calculation of parameters of plant and process water ozonation

Considered 2nd variant of the method of dosing ozone with sequential inclusion of the 3 lines of dispersants brand AFD-270. Initial data for calculation are presented in table 6.

Calculation of installation options

1. The total number of holes in the dispersant AFD-270 separate line within the contact tank:

2. The number of dispersers AFD-270 in one l�Institute one Cu:

3. The number of dispersers AFD-270 in one CU:

4. The total number of dispersers AFD-270 in 6 CU:

5. The pressure drop OVS holes on the dispersant separate line:

6. The consumption of EIA at different levels:

7. Range of sold doses of ozone in the water at each stage of the consumption SVG:

Speed dependence of the total discharge from OBC doses of ozone are shown in Fig.10. The sequence diagram of change of total flow OBC, flow through separate lines dispersant, the concentration of ozone in the OBC and the dose of ozone in water by operating time are shown in Fig.11.

8. The range of realizable performance of the ozone generator in each degree of consumption SVG:

6.3. The unit

Job description the installation is made in relation to the 2nd method, the dosage of ozone using different number of concurrent lines of dispersants.

In the description of the plant were used�ins settings, shown in table 6 and the chart speed dependence of the flow rate of the ozone-air mixture from the ozone dose, are shown in Fig.10.

The device operates in the following manner.

Pre-operations:

- Filling in the contact water tanks

It is produced with a limited flow of water, ensuring the effective discharge of displaced air through the drain pipe 58, which excludes offensive pressure on the ceiling of the tank. Filling to produce a predetermined level, for example, at 5.2 m above the horizon caps dispersants.

- Calibration of the air flow in the process of disclosing valves chokes 30, 31, 32 individual lines of dispersants

Set in the closed position of the valve at the outlet of the collector 76 to the ozone generator 2 and the purge system of air by 6, and the valve 36 at the inlet of the contact tank and the valve trireme chokes 30, 31, 32.

Set in the open position of the throttle 14 and the shutoff valve 51 and the purge system 6, the valve 60 and choke 62 system of abstraction and destruction of residual ozone 5.

Start the air compressor 7 and is filled with air receiver 76 to a predetermined pressure. Start the fan 65.

Install the valve first tararueva of the throttle 30 in the position corresponding fraction from the first stage total R�vanishing, per downloadable one focal line of the tank, namely:

Open the valve at the outlet of the receiver 76 in air purge 6 and record the pressure in the reservoir 29 to the sensor 34 and the flow rate sensor 33. Set pressure provide a change in the position of the throttle 14, and is fixed and predetermined flow provide a change in the throttle position tararueva throttle 30. The pressure in the gas cushion is controlled by throttle 62 according to the testimony of the vacuum sensor 61.

Then install the throttle valve 30 in the position corresponding to 6th degree flow, and 3 concurrent lines, namely. Output parameters to steady state and record the flow rate and the valve position of the throttle.

Further calibration is performed for the n-th stage of consumption, and 2 concurrent lines, namely:and for 2nd stage and one of the running line, namely:.

Similarly spanned valve chokes 31 and 32 of the other two lines of dispersants. In the process of calibration of all chokes at each flow record is also evidence of differential pressure transmitters 37, 38, 39.

The results of the calibration process and in the form aproximarse dependencies G=f1(hhonored.) and G=f2(Δ) are entered in �rogramme-mathematical part of the local system of automatic control of the dispersion process.

Start the installation

Start plants produce in automatic mode according to the established timeline.

Dispatch management system (DMS) installation produces a task analysis on the ozonation of water containing the consumption of treated water, the number and the sequence number of the existing contact tanks and the dose of ozone.

Example job

The water consumption of project - 10700 m3/h;

The number of contact tanks - 6;

The dose of ozone in water is 3.3 g/m3.

Software math unit DSU shall decide the necessary level of consumption of ozone-air mixture using the following inequality:

According to the schedule of step-like dependence of the flow rate of the ozone-air mixture from the ozone dose, are shown in Fig.8, this condition is fulfilled for operating ranges of the dose in steps 3 and 4 with the consumption 2140, 2675 nm3/h

when

For a unique choice stage determine the amount required for the current ozone concentrations at each of them according to the formula:

when

Choose the fourth degree of the flow rate at which the required concentration of C4=13,4 g/nm3the closest to the optimal concentrations of Copt=14 g/nm3.

Number 4 selected steps needed to determine�entered as much as possible the number of individual lines of dispersants, is 2.

Taking into account technological losses of ozone software and mathematical unit DSU determines the current required performance of the ozone generator according to the following formula:

where ε1=0,95 - the actual degree of absorption of ozone water;

ε2=0,98 - coefficient of loss of ozone due to the self-destruction during transportation via the inlet pipeline.

The results of the analysis job ozonation of water DSU reports:

in LAS SST, SSS; SAP and SOD the scale degree and the flow rate of the Swan;

in LAS MTR, SPD value of the performance of the ozone generator, the ozone concentration in OER;

in LAS SPD number of separate lines of dispersants.

The local control systems is carried out under diagnostics and serviceability of equipment, valves and instrumentation.

Damper valves and control valves are set in open position corresponding to the pass given flow rate of the ozone-air mixture, in addition to the damper at the outlet of the collector 76 to the ozone generator 2.

In the open position set the valve at the outlet of the modules 16 of the ozone generator is selected as the working, and the valve 18 at the output of the pipeline, combining the modules into the main feed conduit 19 oz�but-air mixture in the contact tanks, as well as the valve 20 and the throttle 22 in the conduit 19.

In the open position set the valve 36 at the inlet to the overhead tanks.

The throttle valve 30 and 31 are installed in the open position corresponding to the pass of the consumption of selected 4th stage, namely:

using the results of calibration carried out before the start.

In the open position set the valve 60 and choke 62 system of abstraction and decomposition 5.

After the message is received from the LAS's readiness to perform the task DSU issues a "start" command, which is executed in automatic mode according to the established timeline.

First, ensure water flow through the contact tank at an appropriate rate.

Include fan 65 system leads 5 and open the valve to permit air from the receiver 76 in the ozone generator 2.

The voltage at the power source is not available. Seek the steady-state parameters of the air flow: pressure, flow, differential pressure at different points of the tract. Measure the actual flow rate of treated water. Adjust the position of the throttle valves 22 on the main conduit 19 and chokes 30, 31 individual lines of dispersants, achieving specified values of air pressure in the reservoir 29 to the sensor 34 and the airflow meter 33.

Then served on�regenie to sources of power supply processing units ozone generator and seek a given ozone dose, equal to 3.4 g/m3. Calculate the realizable performance of the ozone generator. Adjust the ozone concentration in the OBC by matching a given water flow rate and the actual measured, providing a predetermined dose of ozone. The correction is in the range from 10 to 17.1 g/nm3for a given level of consumption.

With increasing degree of contamination of the treated water in the DAC setup a new job arrives at the dose of ozone. For example, increased from 3.4 to 4.5 g/m3. In this case, according to the schedule shown in Fig.10, a transition to 6th degree flow connection with the optional 3rd line of dispersants. Local control system issues a command first on the simultaneous reduction of the flow area of the inductors 30, 31 existing lines of dispersants and increase the flow area of the throttle 32 connected line of dispersants, achieving first save consumption of 4-th degree with adjustment share of consumption by lines, and then to a synchronous increase in flow area of all three chokes, seeking to establish the desired total flow rate of the ozone-air mixture on the 6th degree, equal 3745 nm3/h. Then increase the concentration of ozone in the ozone generator to the desired option and provide the necessary dose of ozone equal to 4.5 g/m3.

1. Method of dosing ozone� in the processing of drinking water, including the preparation of compressed, cooled and dehumidified atmospheric air, the air passing with a given flow rate through the ozone generator with power supply, ozone synthesis with specific concentrations of ozone in the ozone-air mixture, passing the ozone-air mixture through the apertures of dispersants that are installed in the bottom portion of the contact tanks, allowing the distribution of total consumption of ozone-air mixture between the contact tanks is proportional to the flow rate of water in each of them, disposal of waste ozone-air mixture from the gas cushions of the contact tanks at the destructor of the residual ozone with subsequent emission of ozone-air mixture with a safe concentration of ozone in the atmosphere, characterized in that in the different time periods of operation of the installation of ozone treatment water ozone-air mixture was passed through a dispersant different stages at a constant rate, and the required dose at each stage provide a change in the ozone concentration in the ozone-air mixture in the range from 70 to 120% of the optimal concentration corresponding to the minimum energy consumption for production of 1 kg of ozone and characteristic of used ozonizer unit, moreover, the ratio of the maximum flow rate of the ozone-air mixture �and the last step to the minimum at first taken to be no more than 2, and the size of the bubbles of ozone-air mixture from 0.8 to 1.2 mm, providing a range of values of the degree of absorption of ozone in water in the range of more than 95%, is obtained by passing the ozone-air mixture through either a thin, thickness 0.4÷0.5 mm perforated plate dispersant titanium, in which the holes are made by laser firmware, and the average diameter of the holes is set in the range of 65 to 75 μm, and the diameter of any aperture in the range of 60 to 80 μm, the total number of holes in the dispersant and the minimum differential pressure of the ozone-air mixture in the holes is chosen based on the conditions of passage of the dispersants of the specified minimum flow rate of the ozone-air mixture with an average value of the specific flow rate through a single hole, is equal to (145±15)·NMM3/or ozone-air mixture was passed through a disperser with a porous plate of a thickness of 3÷4 mm, made by sintering titanium powder with a porosity of 45% to 50% and the size of the through pores of 40 to 120 μm, and the total working area of the plates and the maximum differential pressure of the ozone-air mixture on the plates is chosen according to the conditions of passage of the dispersants of the specified minimum flow rate of the ozone-air mixture with an average value of the specific flow rate through 1 cm2the plate area of the dispersant is equal to (290±30)·NMM3/sup> second the chosen level of consumption of ozone-air mixture and the concentration values of ozone performs the corresponding block software dispatch system automatically control the operation of the installation of ozonation of water, which computes given the current performance of the ozone generator according to the following formula:

where Q is the performance of the ozone generator, kg/h;
β - dose of ozone in water, g/m3;
GH2O- water flow, m3/h;
ε1- the actual degree of absorption of ozone water, which is set according to the results of pre-commissioning works;
ε2- coefficient of ozone losses during transportation of ozone-air mixture from the ozone generator to the dispersants,
and sets the suitable level of consumption at which the following condition holds:

calculates the current value of ozone concentration in the ozone-air mixture by the formula:

where n is the sequence number of rate steps;
then issues messages in the local automatic control system (LAS) block of air preparation, ozone generator and dispersion of the ozone-air mixture on the selected level of air flow and in the LAS ozone generator of the required concentration of ozone and receiving communications�ions from the LAS readiness for launch runs the installation according to the accepted timeline, when you go on stage with a high consumption of ozone-air mixture increases the disclosure valves chokes installed on the entrance lines of dispersants, and the pressure drop across the holes and serves extra air into the ozone generator and additional ozone-air mixture of the dispersant, the amount of electric power supply of the ozone generator shall retain, and the ozone concentration is thus reduced by increasing the airflow, so cherish 3÷5 minutes dose ozone level degree, and then after the establishment of a stationary process increase the concentration, providing a predetermined dosage at a new stage of consumption of ozone-air mixture, adjust within 5÷10% of the flow of the ozone-air mixture at the operating level, the output of the generator and the dose of ozone get to the last stage of consumption of ozone-air mixture at the highest concentrations of ozone equal to 1.2 coptand the minimum on the first stage when the minimum concentration equivalent to 0.7 coptwith largest the saleable value of the ratio of the maximum dose to the minimum determined by the formula:

2. Method of dosing of ozone according to claim 1, characterized in that �adanya levels of consumption of ozone-air mixture at the selected speed provide by positioning valves chokes installed in the supply piping of the contact tank prior to the individual groups of the dispersant, the pressure of the ozone-air mixture before it chokes on all the steps of the flow is maintained at the same level by changing hydrocortisone additional throttle installed on the supply line of the ozone-air mixture, a compensating change in pressure loss of the ozone-air mixture in the network when the change rate steps.

3. Method of dosing of ozone according to claim 1, characterized in that the same type dispersants of the ozone-air mixture in the contact tank are combined in three separate lines managed with auxiliary input choke, which provide the required excess reserve disclosure flaps, and use it in case of malfunction of one of the lines of dispersants or by reducing the bandwidth of the holes of dispersants for mineral or biological fouling in the ozonation of water, increasing the pressure drop across the holes to the maximum, and achieve the required flow rate of the ozone-air mixture and dose of ozone.

4. Method of dosing of ozone according to claim 1, characterized in that prior to compression of atmospheric air use several axial compressors low pressure (1,8÷2,1 kgf/cm2) with a fixed level of production�capacity and, sequentially activating one compressor, provide a step change in flow rate of air into the ozone generator in accordance with the law of arithmetical progression:
Gn=G1+d·(n-1), nm3/h
where n is the sequence number of rate steps;
Gn- the charge on the n-th level, nm3/h;
d - difference of the progression is equal to the performance of a compressor;
G1=m1·d - flow at 1st stage, nm3/h;
m1- the number of compressors used on the first stage of consumption,
in this case, the ratio of air flow rate on the last stage of consumption at first taken to be 2 and the maximum required number of compressors mmaxand levels of air consumption nmaxdetermined by the formulas:
mmax=2·m1
nmax=m1+1.

5. Method of dosing of ozone according to claim 1, characterized in that prior to compression of atmospheric air using at least one working pressure compressor, for example, 7÷10 kgf/cm2, periodic action with access to the air collector (receiver), provided on the output gear, automatically maintaining the air pressure at the exit from it into the network, for example, in the range from 1.8 to 2.1 kgf/cm2if the consumption in the network up to 2 times, with the selection of air from the receiver to the ozone generator � ozone-air mixture to produce dispersants steps with flow rate in accordance with the law of geometric progression:
Gn=G1·qn-1nm3/h
where Gn- the charge on the n-th stage;
G1- flow at 1st stage;
n - number of rate steps;
q is the denominator of progression;
the ratio of the maximum flow rate of the ozone-air mixture at the last stage of the Gnkto the minimum flow rate at the first G1take equal 2, and the denominator of progression q is determined depending on the number of stages according to the formula:

possible the recommended number of steps 3 or 4, and the limits have on the dose of ozone at each stage of the flow of OER is determined by the formula:

6. Method of dosing of ozone in drinking water treatment, including the preparation of compressed, cooled and dehumidified atmospheric air, the air passing with a given flow rate through the ozone generator with power supply, ozone synthesis with specific concentrations of ozone in the ozone-air mixture, passing the ozone-air mixture through the apertures of dispersants that are installed in the bottom portion of the contact tanks, allowing the distribution of total consumption of ozone-air mixture between the contact tanks is proportional to the flow rate of water in each of them, disposal of waste ozone-air mixture from the gas cushions contact reserve�acres on the destructor of the residual ozone with subsequent emission of ozone-air mixture with a safe concentration of ozone in the atmosphere, characterized in that the dispersion of the smf at CU use three separate adjustable flow allied lines dispersant, allowing periodic transmission OBC without loss of throughput due to mineral and biological overgrowing holes during idle periods that use perforated plate made of ozone-resistant, highly elastic ethylene-propylene rubber stamps EPDM, molded, deposited on the outer surface of the plate with a release coating of Teflon with a set of through slots, wherein the dispersant have a linear dependence of the specific consumption of ozone-air mixture through one drop down the hole from the pressure drop in the form of:

where- specific consumption of ozone-air mixture through 1 hole, nl/h/OTW;
Δp is the pressure drop, kPa;
kon≈0,5±0,05 - pilot ratio,
in this case, the compressed air on the synthesis of ozone produced from air collector system of training of air, and depending on the magnitude of the dose range of ozone in water sampling produces a flow rate corresponding to one of six prescribed steps, each of which the flow rate of the ozone-air mixture corresponds to the following law of arithmetical progression:

where n is the ordinal number of the stage;
- the total number of holes in the dispersants single line;
- the minimum value of the prescribed doses of ozone in water;
copt- the optimal concentration of ozone in the ozone-air mixture;
- a predetermined flow of water to be treated;
- adopted by the minimum value of specific consumption of ozone-air mixture through one hole of a dispersant, nl/h/ot, and if you increase the minimum ozone dose not more than 6 times using 6-speed flow:
- 1st and 2nd - for the passage of the ozone-air mixture through one line of dispersants,
- 3-th and 4-th degree for passing the ozone-air mixture through two lines of dispersants,
- 5-th and 6-th degree for passing the ozone-air mixture through the three lines of dispersants;
with the dose of ozone at each step constant flow ozone-air mixture provides the change in the concentration of ozone in OBC in the range of 0.7·coptto 1.2·copt; specified level of consumption OBC on the selected steps provide by setting the corresponding position of the dampers input chokes separate lines of dispersants OBC, yet supportive at the same level at all stages of the flow pressure of the allied front by changing chokes to�nesiruosia of hydrocortisone additional throttle, installed on the supply line of contact allied tanks of the unit; the choice of rate steps of the EIA and the concentration values of ozone performs the corresponding block software dispatch system automatic control (DSU) the installation of ozonation of water, which computes given the current performance of the ozone generator according to the following formula:

whereQzadteK- the performance of the ozone generator, kg/h;
βzadteK- dose of ozone in water, g/m3;
GH2O- water flow, m3/h;
ε1- the actual degree of absorption of ozone water, which is set according to the results of pre-commissioning works;
ε2- coefficient of loss of ozone due to the self-destruction during transportation OBC from the generator to the dispersants,
and sets the suitable level of consumption at which the following condition holds:

calculates �neobhodimuu value current ozone concentrations in OBC by the formula:

where n is the ordinal number of the selected stage;
then issues messages in the local automatic control system (LAS) system of air preparation, ozone generator and dispersion of the smf on the chosen level of consumption of the allied and advanced to the LAS ozone generator of the required concentration of ozone and receiving messages from all the LAS readiness for launch, launching the installation according to the accepted timeline;
in the transition to a higher level of consumption because of increasing doses of ozone without the need for an extra line of dispersants the LAS dispersion system issues commands for synchronous increase in flow area of the input chokes existing lines of dispersants, trying to achieve the desired total flow rate of the EIA and in the LAS system of ozone production about the change of ozone concentration, trying to achieve the rated output of the generator and ozone dose;
when you connect an additional line of dispersants at the command of the DSU LAS dispersion system first issues a command to the synchronous decrease of the flow section of the input chokes existing lines of dispersants and the increase of the passage section of throttle input plug line, achieving first save of the expenditure of the allied and adjustment share of exp�Yes lines using the meter differential pressure, and then at the simultaneous increase of the flow area of the choke of all existing lines, seeking to achieve the requisite cumulative expense of the EIA and in the LAS system of ozone synthesis about changing ozone concentrations and achieving the rated output of the generator and ozone dose.

7. Installation for water treatment by ozone, containing a system of training of air, comprising a compressor unit, dehumidifier, chiller, system synthesis of ozone, including ozone generator with power supply, contact tanks with feeding system, transmission and discharge of water to the consumer, supply system, distribution and dispersion of the ozone-air mixture (OBC), containing the main pipeline which communicates with the ozone generator and the dispersants of the ozone-air mixture, by means of taps on each of the contact tank and feed lines that have installed and are evenly distributed in the bottom portion of the contact tank dispersants bubbles of ozone-air mixture, system waste diversion OBC from the gas cushions of the contact tanks, destruction of residual ozone and emissions mix in the atmosphere, the system of automatic control with shut-off and regulating and control devices, characterized in that the system of preparation the dried and cooled air includes: �for several similar low pressure compressors in the range from 1.8 to 2.1 kgf/cm 2with the same constant level of performance, the device of the bypass air from the outlet of the compressor to the input with the ability to use it when starting the compressors and the air consumption of the network or includes at least one working compressor high pressure in the range from 7 to 10 kgf/cm2periodic action with access to the air collector (receiver), provided on the output gear, automatically maintaining the air pressure of 1.8÷2,1 kgf/cm2the output in the pipeline feeding the ozone generator and is provided with a shut-off element and the flow of air and pressure; in the main pipeline of submission of the OBC to the taps on the contact tanks mounted pressure gauge and automatic expansion device with the possibility of maintaining the level of the feed pressure by compensating the change of pressure loss in regulating the flow of the Swan; each of the contact tank is provided with the distribution manifold with pressure gauges and the concentration of ozone in the OBC and the flow measuring device installed at the outlet from the main pipe, with the same type dispersants allied joint supply pipes in three separate lines, communicate with a distribution manifold through the inlet chokes with automatically adjustable size� flow section, the maximum value of which is 3÷4 times more than the total flow area of the holes in the plates dispersant individual lines; and each line can be equipped with the same type of dispersant with a porous plate of a thickness of 3÷4 mm, produced by sintering of titanium powder with sizes of through pores from 40 to 120 μm, with a total working area of the plates dispersant three lines are chosen to provide a minimum prescribed dose of ozone in water at a minimum concentration of ozone in OBC equal to 70% of the value of the optimal concentration, corresponding to the minimum energy consumption for production of 1 kg of ozone and characteristic of used ozonizer unit, and the average specific consumption of OBC through 1 cm2the working area of the plates is $ 290±30 NMM3/with or can be equipped with dispersants titanium plates with a thickness of 0.4÷0.5 mm, perforated laser, with an average diameter of holes in a component party in the range of 65 to 75 μm, when the diameter of any hole from 60 to 80 μm, while the total number of holes in the dispersant is selected from the condition to ensure minimum prescribed dose of ozone in water at a minimum concentration of ozone in OBC equal to 70% of the optimal concentration, and average specific consumption Obscures one hole, is $ 145±15 NMM3/with or can be equipped with dispersers of periodic action with plates made of ozone-resistant elastomeric synthetic ethylene-propylene rubber stamps EPDM, molded, deposited on the outer surface of the plate with a release coating of Teflon with a set of through slots, the drop in tension plates of the internal pressure and closing when the pressure relief from tightness, the total number of slots in each individual dispersants lines are chosen to provide a minimum prescribed dose of ozone in water at a minimum concentration of ozone in OBC equal to 70% of the optimal concentration, and average specific consumption of OER through a single slot equal to 125±13 NMM3/s; the system of assignment of the OBC from the gas cushion of the contact tank and destruction of residual ozone is further provided with a throttle with automatic variable area flow section with the possibility to maintain a predetermined pressure level of the vacuum in the gas cushion of the contact tank and the destructor of residual ozone installed on emergency drain tube that tells the gas cushion with the atmosphere; each individual line of dispersants is provided with a protection device not�tatnovo increase in pressure of the OBC in the form of a hydraulic lock, the entrance to which is communicated with the supply pipe line of dispersants, and the output is communicated with a water contact array of the reservoir at a level located below the horizon of the location of plates dispersant in an amount corresponding to the allowable differential pressure OVS holes dispersant; contact tank is further provided with an air supply system in the line of dispersants predetermined pressure and flow rate with the possibility of adjustment of the stroke of the damper input of choke line flow rate at allied, commissioning and subsequent current control reduce the bandwidth of the holes of dispersants during operation, and the displacement of water from the cavities of dispersants and feed lines including a source of compressed air, the supply piping with shutoff and control and recording equipment, and communication with the distribution manifolds contact allied tanks, lines, dispensers, gauges differential pressure OVS holes on the dispersant, as well as protection locks.

8. Installation for water treatment by ozone according to claim 7, characterized in that the air supply system is further provided with a distribution manifold with three taps, the output of each of which is communicated with the outlet ports of the respective line of dispersants, and at the entrance to the allotments set�Lena isolation valves automatic actions with the possibility of air supply to alternating current control capacity reduction holes dispersant separate line with the regular work on other ozone-air the mixture (OBC), wherein the contact tank is equipped with three measuring the pressure drop across the dispersant, one measuring cavity which is communicated with a water array on the horizon of the plates of the dispersants and the other with a corresponding withdrawal from the optional header.

9. Installation for water treatment by ozone according to claim 7, characterized in that the contact tank is further provided with a system of ongoing monitoring of the concentration of residual ozone in the gas cushion, comprising: measuring in the range of maximum permissible concentration (MPC) of the residual ozone in the ozone-air mixture (OBC) drawing a sample from the sea floor CU with the possibility of issuing a permit for the entrance inside the CD to carry out service and maintenance work and measuring the concentration of residual ozone in the functioning of the CU in the normal mode with sampling directly above the water level with the possibility of monitoring the actual value of the degree of absorption of ozone water and the detection of cases of depressurization in the system dispersion.

10. Installation for water treatment by ozone according to claim 7, characterized in that the dispersant can be performed either in the form of hollow panels with perforated top wall with a length to width ratio from 5:1 to 6:1, while panels in the contact tank are installed in rows with gaps for the passage of water�, that the longitudinal axis of symmetry of the panels parallel to each other, and separate panel lines alternate in the same sequence, and between the rows of panels are provided passages for maintenance, attachment of panels to power nozzles made with the possibility of rotation and fixation of the panels in the horizontal plane, with the plane of rotation of panel dispersants individual lines are shifted vertically by an amount greater thickness of the panels, or made in the form of hollow discs and are integrated in a compact group one dispersant from each line with equal distances between their centers with the formation of free passes, sufficient for installation and maintenance.

11. Installation for water treatment by ozone according to claim 7, characterized in that the pipe feeding the ozone-air mixture dispersants separate line, in the shape of a rectangular grating mounted on supports at the bottom of the contact tank with a gap relative to the walls, it includes: two longitudinal distribution piping located on the same horizon at the walls, and one drain in the middle between the walls at a lower horizon, horizontal pipes vertical pipes and mounted with dispersants and communicated with a drain and distribution of drobopro�DAMI, when the drain pipe is made downwardly from the transverse walls to the middle contact of the reservoir and the site of maximum drawdown to him docked seal in the form of two vertical pipes with a rounded crosspiece at the top, the upper point of which is located above the horizon of the plates of the dispersants of this single line, the open end of the discharge pipe of the trap is lowered into the water contact of a reservoir below the horizon plates dispersant in an amount corresponding permissible excess pressure of the ozone-air mixture in the cavity of the dispersant, and expressed in m water column, and to the middle of each longitudinal distribution piping docked vertical pipelines which the ceiling of the contact tank coupled to the conduit communicating with the outlet ports.

12. Installation for water treatment by ozone according to claim 7, characterized in that on each branch from the main pipeline to the contact tank filter is installed with the possibility of additional cleaning of the ozone-air mixture flowing through the micro-holes of the plates of dispersants.



 

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18 cl, 3 ex

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18 cl, 3 ex

FIELD: water treatment.

SUBSTANCE: invention relates to removing and decomposing nitrate ions contained in water, for example in ground water or in surface waters. Process consists in passing aqueous solution through electrochemical cell containing at least one anode and at least one cathode and passing electric current between them. Surface(s) of cathode is(are) covered with layer consisted of metallic rhodium. Aqueous solution is preferably aqueous solution, which was used for regeneration of ion-exchange column.

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18 cl, 3 ex

FIELD: water treatment.

SUBSTANCE: invention relates to removing and decomposing nitrate ions contained in water, for example in ground water or in surface waters. Process consists in passing aqueous solution through electrochemical cell containing at least one anode and at least one cathode and passing electric current between them. Surface(s) of cathode is(are) covered with layer consisted of metallic rhodium. Aqueous solution is preferably aqueous solution, which was used for regeneration of ion-exchange column.

EFFECT: enhanced electrochemical cell efficiency.

18 cl, 3 ex

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