Method and device for treated sewage water utilization

FIELD: methods, systems, or installations for draining-off sewage water into ponds through underground horizons.

SUBSTANCE: method involves prospecting underground horizon with required absorbing capacity extending into pond; arranging gravity water flow into horizon; bringing water flow velocity up to underground horizon seepage velocity and providing dispersed laminar water flow. Device comprises water supply pipeline and receiving filtering well with waterproof side walls filled with coarse filling material and having narrow neck. Arranged inside neck are water flow deflectors installed below water supply pipeline in several rows and filter widening in downward direction. Accumulation chamber is located at upper filter part. Coarse filling material is located under accumulation chamber. Particle size of coarse filling material smoothly reduces in top-down direction and filter bottom is located below upper boundary of underground absorbing horizon.

EFFECT: increased output, increased quality of utilized water.

2 cl, 1 ex, 2 dwg

 

The invention relates to the construction, in particular to methods and devices for disposal of treated wastewater into water bodies through the underground horizons.

A known method of supplying wastewater in underground waterproof layer, including the presence of isolated deep underground aquifers, wells and pumping through them under pressure waste water [see Purification of industrial wastewater. M.: stroiizdat, 1979, str-276].

This method cannot be used, because the current requirements do not allow the exclusion of water from natural water circulation.

A known method of disposal of highly saline waters by filing in underground aquifers through the tubular hub, is provided with radial distributor [see U.S. patent N 5637228, 2 F 1/58, publ. 03.07.95]. In this way karst underground cavities are used as reaction vessels, where the injected reagents for desalination of water. The method requires large amounts of energy for pumping water into underground aquifers. This underground aquifers are not used as improve the water quality factor.

These methods are not always applicable for the disposal of wastewater generated in the cities, as due to the large number and because of unsuitable geological structure adjacent to the cities of the subsurface horizons.

WPI the walls of the method of purification of water, including water supply, first in a collection tank, and then artificially educated waterproof channel below the earth's surface [see German Patent 19737542, C 02 F 3/02. publ. 07.01.99,] the Channel is lined with a soil filter material, enriched air and microorganisms.

This method allows you to clean waste water from mechanical impurities, but it is expensive, and in the future also requires additional treatment and recycling.

Known methods of disposal of treated wastewater by filing them into water bodies [see sewage. - M.: Stroiizdat, 1975, s-423]. Ways to use the device in the form of flow dividers that allow you to use part of the energy of the river as moving the reservoir to a dilution of sewage.

These methods are widely used in the cities and towns located near the water, but they will be disposed of only well-purified water. A serious disadvantage of these methods is the lack of reliable mixing purified water with a water reservoir that leads to negative effects. For example, for injection of treated water into the sea through a deep release of the above reason, treated waste water surface and the sea waves are returned to the coastal edge, worsening sanitary the state Bank. Thus, cost for deepwater production greater than or equal to the cost of sewage treatment plants.

The closest analogues, taken as a prototype, is the process of wastewater treatment including the presence of absorbing horizon and the arrangement of the release it purified water [see SNiP 2.04.03.85. The sewer. External networks and facilities. P.41-42].

This method has low productivity.

The objective of this technical solution and its technical result is better performance and utilization of water in underground aquifers, reducing the cost and improving the quality of recycled water due to the integrated use of the natural factors.

This technical result is achieved in that in the method of disposal of treated wastewater, including the presence of absorbing soil horizon and arrangement of the release of water in it, there are differences, and it is found underground horizon with the required absorptive capacity, forewarned is in the basin and developing the gravity of the issue, and reduce the feed rate of water to a filtration rate of the aquifers and translate mode flow from turbulent to laminar and dispersed.

The proposed method allows the use of injection energy of water is mA that eliminates the need of energy for pumping waste water into underground aquifers. Residuosity stream and translating the movement of water from turbulent to laminar regime, the supply of large volumes of treated wastewater. In addition, the water passing through the filter subsurface horizon with a certain electrostatic charge, is released from a number of fields of anthropogenic origin: magnetic, electromagnetic, electrostatic and other, which has a beneficial effect on its quality [see Abstracts of scientific-technical seminar “Ecological and hygienic problems of the Metropolis-XXI century and a strategy for their solution. International exhibition of the latest technologies environmental and resource-saving technologies “Man, city and environment”. Moscow, 1998,p.33-36].

Passing through the filter and absorb the underground horizons, forewarned in water, purified water moves in the direction of the reservoir very slowly and unloaded in him the filtration speed underground horizon, thus providing the most eco-friendly occurrence of water in the natural environment and is at the same time an additional process of its purification. Thus, the feedwater enters the reservoir dispersed, thus ensuring its thorough mixing with water of the pond.

In addition to the way the utilization of the water present technical solution offers the device for its implementation.

The closest analogue, taken as a prototype, is a device for the disposal of pre-treated wastewater in underground absorbing horizon, including pipe water supply and the receiving filter well with impermeable walls, filled with coarse-grained filler [see SNiP 2.04.03.85, Sewerage, external networks and facilities, p.42].

The disadvantage of these devices is their low performance.

The technical result of the proposed technical solution is improving the performance of the device for disposal of treated wastewater in absorbing horizons.

The technical result is achieved by the fact that in the known device for the disposal of pre-treated wastewater, including pipe water supply and the receiving filter well with impermeable walls, filled with coarse-grained filler, there are differences, namely, the receiving filter well has a narrow neck in the cavity which is below the pipe water supply installed in several levels reflectors flow of water, and extending to the bottom of the filter in the upper part of which is the accumulation chamber, and below there are several layers of coarse aggregate, the size fractions of filler gradually decreases from the top to the bottom, and the bottom is Nerevarine border underground absorbing horizon, forewarned is in the reservoir. The proposed device is infiltration-absorbing.

Figure 1 shows a device for the disposal of pre-treated wastewater in the context, as well as its position relative to ground level, absorbing the horizon. Figure 2 shows the position of the device for the disposal of pre-treated wastewater in the context, as well as its position relative to ground level, absorbing skyline and waterfront.

The device (see figure 1) includes the pipeline 1 supply of treated wastewater and the receiving filter well 2, consisting of a cap 3 and a filter 4, extending to its bottom 5 as well as the collection chamber 6, the reflectors 7 water flow. The filter 4 in cross section has the form of a truncated cone. The bottom 5 of the filter is located below the upper boundary of 8 underground absorbing horizon, forewarned is in the reservoir. In the upper part of the filter 4 is accumulating chamber 6, below the filter 4 is filled with several layers of coarse aggregate 9, for example gravel, particle size of which gradually decreases to the bottom 5 of the filter 4. Wall 10 of the filter 4 is made of waterproof material, such as concrete or reinforced concrete. The reflectors 7 water flow are located in the neck below the pipe 1 water supply in several levels and can be in the form of a cone.

The proposed method Ooty is Itachi pre-treated waste water is carried out in the proposed device, as follows. Using hydrogeological investigations are absorbing subsurface horizon with the required absorptive capacity, forewarned in the reservoir (see figure 2), settle the issue of water in it, why use the proposed device, which will operate in the mode absorber and to provide gravity gravity release water into the underground aquifer. The treated wastewater flows into the neck 3 of the receiving pit 2 of the pipe 1 water supply. The flow of purified water has a velocity V1at the entrance to the well. Getting on the reflectors 7, installed in multiple levels in the receiving pit 2, the water flow is divided into a number and reflected from the faces of the reflectors 7 on the wall of the neck 3 of the well 2 and back on the next series of reflectors 7. As a result, the flow speed decreases to a speed of V2and with this speed the water enters the collection chamber 6, and the movement of water continues to be turbulent in nature.

The cumulative bottom of the chamber 6 at the same time is the upper layer of filler, cotrim filled widening toward the bottom of the filter 4. The particles of the filler 9, such as gravel, are dividers of fluid flow. They quench its speed and regulate the flow of water seeping between the filler particles 9. The next layer of the filler 9 is smaller the size is, due to what the thread is becoming more dispersed, and the water velocity decreases. Reaching the bottom of the 5 filter 4, multiple streams of purified water dispersed absorbed in absorbing the horizon with velocity V3equal to the rate of filtration of underground horizon. Thus the flow of treated wastewater passes from the turbulent regime in laminar and dispersed. The adjustment of the rate of absorption in the underground horizon and a feed rate of the water therein reaches due to the larger area of the bottom 5 of the filter 4 in comparison with the cumulative area of the bottom of the chamber 6. Served in the underground horizon, the treated wastewater then enters also dispersed in water. In underground aquifers, the water is released from anthropogenic fields, resulting from its economic use.

Example. The method is as follows:

When the required amount of utilized water 100000 m3/day was found using hydrological surveys subsurface horizon with absorptive capacity, which is characterized by the infiltration rate 0,0009 m/C. Underground horizon lies at a depth of 27 m and wedged into the pond at a distance of 17 km from the coastal edge. Thus the bottom of the device for disposal must be at a depth of not less than 27 meters, the bottom Area 5 f is of ltra 4 is calculated based on the depth of the absorbing horizon, the number and size of particles of the filler and the water velocity V2in the accumulation chamber 6 and the initial speed of the water flow V1. The bottom of the receiving filter of the well is at a depth of 27 meters

When the speed of water flow in the pipe V1=1.0 m/s and the number of rows of reflectors in the neck, is equal to 4, in the accumulation chamber area 6,28 m2the velocity of flow V2=0.3 m/s To reduce to a filtration rate of the aquifers will need 5 rows of filler, and the sizes of fractions will be:

1-I fraction is 10 mm;

2-I faction - 8 mm;

3rd faction - 6 mm;

4th faction - 4 mm;

5-I fraction - 2 mm.

After passing through the 5 layers of filling the water velocity V3reduced to a filtration rate of the aquifers 0,0009 m/s and with this speed the water will flow into the pond.

Based on the hydrological data from the computer model shows that when the quantity of purified water 100000 m3/d in the proposed device with a base diameter of about 15 m area of the exit stream of purified water is approximately 54 square kilometers, and the time of passing the treated water through the underground horizon will amount to 179 days, which is enough to restore the natural qualities of water.

In the classical scheme of the device receiving the filtering wells once the leader 2× 2 depth of 2.5 m, with the absorptive capacity of 80 l/day for 1 m2the surface in sandy soils, not forewarned in the pond, you will need not less than 52 thousand such wells, which proves the achievability of the claimed technical result of the proposed technical solutions.

1. The method of disposal of treated wastewater, including the presence of absorbing soil horizon and the arrangement of the release of water therein, characterized in that find the underground horizon with the required absorptive capacity, forewarned is in the reservoir, and equipping of gravity of the issue, bring the water velocity to the speed of filtration of the aquifers and translate it to flow in laminar and dispersed.

2. The device for disposal of treated wastewater, including pipe water supply and the receiving filter well with impermeable walls, filled with coarse-grained filler, characterized in that the receiving filter well has a narrow neck in the cavity which is below the pipe water supply installed in several levels reflectors flow of water, and extending to the bottom of the filter in the upper part of which lies the collection chamber, below which are several layers of coarse aggregate, the size fraction of filler gradually decreases from the top to the bottom, with the bottom of the filter náchod is conducted below the upper boundary of the underground absorbing horizon, forewarned is in the water.



 

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