Method of deep biological purification of sewage waters from organic compounds and ammonium salt nitrogen

FIELD: chemistry.

SUBSTANCE: invention can be used for biological purification of household and close to them in composition industrial sewage waters from organic compounds and nitrogen of ammonium salts. Initial sewage water is processed in alternating zones with reduced oxygen regime and aerobic regime with further settling biologically purified water and recirculation of active silt. First, sewage water is processed in two zones with reduced oxygen regime, where growth of attached microorganisms is performed on planar inert material with specific area of its surface in first zone 17 m2/m3 and in second- 21 m2/m3 and hydraulic load in first zone not higher than 1.38 m3/m2 of carrier and in second - 0.43 m3/m2 of carrier. After that, processing is carried out in two aerobic zones with specific surface of inert charge material 24 m3/m2 and hydraulic load 0.32 m3/m2 of carrier in each. Recirculated mixture of sewage water and active silt from last aerobic zone is supplied to beginning of first zone in amount 120-150% of volume of supplied sewage water. Concentration of oxygen in zones with reduced oxygen regime is supported in amount 0.5 mg/l, and in aerobic zones - 4-5 mg/l. Settling of purified water is realised for 1-1.5 hours.

EFFECT: method provides increased stability of purification processes, reduction of energy consumption for air supply, twofold reduction of volume of secondary settling tanks.

1 ex, 1 tbl, 4 cl

 

The invention relates to the field of purification of household and similar industrial waste water from organic compounds and nitrogen of ammonium salts and can be used for wastewater treatment from detached residential buildings, complexes, townships, and cities in the reconstruction of existing and construction of new sewage treatment facilities.

The closest in technical essence to the proposed invention is a "Method of deep biological treatment of wastewater from the nitrogen of ammonium salts" (patent RU N2185338 with priority from 31.05.2000 ). The method comprises treating the waste water in an alternating zones of low oxygen regimes, and aerobic regime with subsequent sedimentation of biologically treated water and recirculation of activated sludge in the amount of 100% of the volume of incoming wastewater with its distribution in areas with low oxygen content, with 60% of the source water is fed into the first zone with low oxygen regimes, and in the next zone with low oxygen regimes - 40%.

The disadvantages of this method are:

- low stability during volley discharges hardly oxidized wastewater;

- an overabundance of electricity to the flow of air into the aerobic zone (6-7 IHO2/l);

- a great time defending biologist�Cesky purified water - 2.5-3.0 hours.

The technical result of the invention - improving the stability of the system to volleys and other emergencies; reducing energy consumption; reducing the time of sedimentation of biologically treated wastewater up to 1-1,5 hours.

The technical result is achieved in that the first waste water in full handle in areas with low oxygen regimes, and then in the aerobic zones with attached microorganisms, wherein the recycled mixture of wastewater and free activated sludge from the last aerobic zone is served at the beginning of the first zone with low oxygen regimes in the amount of 120-150%) of the total volume of influent wastewater; capacity of the attached microorganisms produce inert material "Irrigation" with a specific area in the first zone with low oxygen regimes 17 m2/m3in the second zone 21 m2/m3and in areas with aerobic mode - 24 m2/m3when the hydraulic load is respectively not higher: 1,38; 0,43; 0.32 m3/m2media treatment of waste water in areas with low oxygen regimes is carried out respectively for 1.4 and 3.4 hours; in areas with aerobic regime of 2.6 and 1.4 hours.

The concentration of oxygen in the aerobic zones regime support in the amount of 4-5 mg/L. Standing for�R produce purified water for 1-1. 5 hours.

The figure shows a diagram of a method of deep biological treatment of wastewater organic compounds and nitrogen of ammonium salts, where:

1 - the zone of low oxygen regime with a specific area of the carrier 17 m2/m3;

2 - the zone of low oxygen regime with a specific surface area of 21 m2/m3;

3 and 4 - zone aerobic mode with a specific area of the carrier 24 m2/m3;

5 is a cesspool.

The purification method is as follows. All initial waste water is fed into the first zone (1) low oxygen regimes, as well as recycle from the last aerobic zone (4) a mixture of biologically treated water with free-floating activated sludge in the amount of 120-150% of the volume of wastewater. The mixed stream is passed in turn through all the zones in ascending-descending or nishadas-upward direction, surrounding the planar inert carrier overgrown with microorganisms on it. The denitrification process in the proposed method is performed without the use of external source of carbon, i.e. organic substances contained in the waste water, i.e. the purified waste water passes through a specific, selective for each zone of attached microorganisms that sequentially oxidize pollution that causes �high quality of wastewater treatment. In areas with low oxygen regimes (1 and 2) support the oxygen concentration of 0.5 mg/l in the aerobic zones (3 and 4) - 4-5 mg/l. the Specific surface planar carrier was in the area (1) is 17 m2/m3in the zone (2) - 21 m2/m3in zones 3 and 4 - 24 m2/m3. The hydraulic load on an inert carrier, respectively: 1,38; 0.43 and 0.32 m3/m2. In the sump (5) carry out the separation of purified water from the activated sludge, which is output from the system for further processing.

Example: the proposed scheme was tested on a pilot plant based on NEIL RMBSS the sanitation Department MGRS. Waste water characteristics on pollution: BOD5=190-250 mg/l, ammonia nitrogen NH4+=20-30 mg/l, phosphorus of PO43-=7-8 mg/l, filed on biological treatment, after the zone (4) has written to the recirculating water in an amount of 120-150% of the total volume of incoming wastewater. The specific surface area of planar media, "Irrigation" was in the zone (1)-17 m2/m3in the zone(2) - 21 m2/m3in zones 3 and 4 - 24 m2/m3. The hydraulic load on an inert carrier, respectively: 1,38; 0.43 and 0.32 m3/m2. The average concentration of attached microorganisms in the zone (1) - 2.7 g/l; in the zone (2) - 1.8 g/l; in zones (3 and 4) - 0.9 g/L. In this case about�Alitalia power, respectively: 1,32; And 0.01 to 0.074 kg BOD51 m3a day. The processing time of the waste water was taken in the zone (1) is 1.4 hours, in the zone (2) 3.4 hours, in the zone (3) - 2.6 hours in the zone (4) is 1.4 hours; time, settling to 1.5 hours.

Already at the exit zone (3) the concentration of contaminants on BOD5did not exceed 3.7 mg/l and ammonia nitrogen salts - 0.3 mg/L. Indicators of purified water (BOD, ammonia nitrogen,-in substances) after clarification in a settling tank were below the MCL for discharging sewage into water bodies of commercial fishing importance.

To determine the stability of wastewater treatment by the proposed method repeatedly off the air for 5-10 hours and were completely drained from the unit water filling its waste water source composition. A day after launching the installation of all the cleaning performance restored.

Thus, when comparing wastewater treatment by the proposed method and the closest in technical essence (EN N2185338) as implemented in the reconstruction of treatment facilities of the city of Kolomna, the following should be noted:

- on the restoration of the wastewater system for the proposed method takes about a day after an emergency, and by a known method at least a week, which testifies to the stability and resilience of the proposed method;

in aerobic �areas proposed method, the demand of oxygen is 4-5 mg/l, and in present - 6-8 mg/l, whereby it is possible to save energy;

- for clarification of biologically treated wastewater by the proposed method requires no more than 1.5 hours due to the fact that it settles in a wastewater biofilm, sorbera on yourself free-floating activated sludge, as in the known method, the time of clarification is 2.5-3.0 hours, i.e. the volume of secondary settling tanks may be reduced almost in 2 times.

The proposed method can be applied in existing aeration tanks-the propellants after a simple renovation, and construction of new treatment facilities.

1. Method of deep biological treatment of wastewater organic compounds and nitrogen of ammonium salts, comprising treating the waste water in an alternating zones of low oxygen regimes, and aerobic regime with subsequent sedimentation of biologically treated water and recirculation of activated sludge, characterized in that the first waste water is treated in two zones with low oxygen regimes, where the capacity of the attached microorganisms to produce planar inert material in its specific surface area in the first zone 17 m2/m3and the second is 21 m2/m3and the hydraulic load is not above 1.38 m3/m2media and second - 0.43 m3/m2medium, and W�in the two aerobic zones in a specific area of inert boot material 24 m 2/m3and hydraulic load of 0.32 m3/m2media in each with attached microorganisms, wherein the recycled mixture of wastewater and free activated sludge from the last aerobic zone is served at the beginning of the first zone with low oxygen regimes in the amount of 120-150% of the volume of incoming wastewater.

2. A method according to claim 1, characterized in that the treatment of the waste water in the first zone with low oxygen regimes is carried out in a period of 1.4 hours, in the second zone 3.4 hours; and in the first aerobic zone to 2.6 hours in the second zone is 1.4 hours.

3. A method according to claim 1, characterized in that the oxygen concentration in the aerobic zone is maintained in the amount of 4-5 mg/L.

4. A method according to claim 1, characterized in that the advancement of the biologically treated water is carried out for 1-1. 5 hours.



 

Same patents:

FIELD: process engineering.

SUBSTANCE: invention relates to biological treatment of domestic and industrial effluents. Proposed device comprises tank divided by webs and partitions into separate sections and compartments, air feed system lines, effluents distribution and discharge lines and system of silt mixes distribution and biological filter. Said tank is composed of cylindrical outer wall 2 fitted coaxially at bed 1, mid cylindrical wall 3 and settler composed by lower conical part 4, lower cylindrical part 5, upper cylindrical part 6 and upper cylindrical part 7. Space between walls 2 and 3 is separated by different-height webs. Every compartment has separate web with bore at its bottom part. Space between mid wall 3 and settler is divided by vertical different-height webs with cutouts 51 into separate cascade-overflow sections. Settler bottom part has slotted valves and wastes trap 33 arranged at the bottom.

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FIELD: chemistry.

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2 dwg

FIELD: chemistry.

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12 cl, 1 dwg, 1 tbl

FIELD: chemistry.

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FIELD: chemistry.

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13 cl, 3 dwg, 1 ex

FIELD: chemistry.

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22 cl, 1 dwg

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4 dwg, 1 ex

FIELD: chemistry.

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14 cl, 4 ex

FIELD: oil and gas industry.

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4 cl

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22 cl, 6 dwg

FIELD: machine building.

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2 cl, 9 dwg

FIELD: chemistry.

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14 cl, 6 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to combined magnetic processing of fluids. Proposed device comprises housing 1 connected via fluid feed and discharge pipes and magnetic unit 6 fitted therein and composed of the set of permanent magnets. Fluid flow channel is arranged between said magnetic unit 6 and housing 1 and composed of spiral with pitch ratio equal to six. The length of magnetic unit 6 is comparable with its diameter. Ferromagnetic washers 7 are fitted between three circular magnets of magnetic unit 6. Electromagnets 4 built around Helmholtz coils 5 with reactive power compensators are arranged at fluid feed and discharge pipes 2 and 3.

EFFECT: efficient magnetisation of fluid flow, ruled out permanent magnet effects.

1 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to water crystal cleaning of harmful admixtures including heavy isotopes of deuterium. Proposed device comprises case 11 to house riser 8 with two chambers 4, 1. The latter make inlets for portable water and heat carrier. Portable water chamber 4 is connected with inside of case 11 that has outlet at its bottom. Heat carrier chamber 1 is connected with inside of ribs 7 arranged in case 11 and combined by outlet. Outer surface of ribs 7 is wavy.

EFFECT: continuous formation of deuterium ice in portable water.

2 dwg

Steam separator // 2554132

FIELD: process engineering.

SUBSTANCE: invention relates to steam fractions separators. Steam separator comprises vessel for boiling fluid with top section provided with circular horizontal ring with inner groove and hole for condensate. Several identical elements consist of vertical tubes with horizontal rings arranged at their lower part and like rings at upper part provided with grooves with holed for condensate draining. Note here that said elements are fitted one on the other while the last one at upper part is plugged.

EFFECT: higher efficiency.

2 cl, 1 dwg

FIELD: devices for purification of household and industrial sewage.

SUBSTANCE: the invention is dealt with devices for purification of household and industrial sewage and intended for electrical and cavitational treatment of sewage containing a large quantity of organic compounds. The device for purification of sewage consists of a body made out of a dielectric material partitioned by diaphragms for two electrode chambers and one working chamber, that contains a filtering material. The electrode chambers have cavitational field sources installed and the working chamber is supplied with a the bubbler installed in it. The technical result consists in an increase of recuperation of the filtering material at the expense of application of a cavitational field to it, decrease of the microbiological semination, and an increase of cavitational effect on particles.

EFFECT: the invention ensures an increase of the filtering material recuperation, decreased microbiological semination and increased the cavitational effect on particles.

1 dwg

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