RU2570546C2 - Method of wasteless biological purification of sewage waters with recycling of separated sediments - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: method includes water percolation, settling, averaging of sewage water consumption and discharge of sewage waters for settling, denitrification of nitrates of return active sludge, nitrification of ammonium nitrogen, settling sludge mixtures, recirculation of return active sludge into denitrifiers, after-purification of sewage waters in bioreactors with biocoenosis of hydrobionts, binding phosphates by reagents, filtration of sewage waters, disinfection of purified waters by UV irradiation or addition of reagents, dehydration of wet sediments and excess of active sludge. To recycling, dehydration, disinfection of dehydrated sediments and reduction of their humidity used are composters in form of rotating drums with duration of composting not more than 5 days with achievement of 80°C temperature in composters; also, additive to dehydrated sediments in form of filler from crushed wastes of vegetation or food wastes is used before composting.

EFFECT: deep decontamination of wastes of sewage treatment plant with reduction of energy consumption, quantity of removed and used air.

8 dwg

Description

The invention relates to methods for biological treatment of domestic and industrial wastewater and can be used in municipal services of cities, industrial complexes.

The use of three-strained biological water treatment is known. Patent for invention No. 2264353, published November 20, 2005, Bull. Number 32. Patent holder Kulikov N.I. Communities of microorganisms attached to a fiber brush nozzle and free-floating activated sludge provide intensive cleaning processes with microbial communities specialized in cleaning stages.

The known device did not pay attention to reducing harmful emissions into the environment, especially the processing of sediments.

The closest in terms of the greatest number of similar essential features, the achieved effect of wastewater treatment, the modularity of blocking of individual units, the completeness of the equipment, the compactness of the treatment plant, and the creation of favorable conditions for maintenance personnel in hygiene and labor protection led to a method of treating wastewater to produce purified water and disinfected waste (Pat. 2475458 C2 Russian Federation. IPC C02F 9/14. Publish. 02.20.2013. Bull. No. 5. Authors: Kulikov N.I. et al. Patentee: CJSC ECOS Company).

The well-known treatment plant achieved a zero balance of waste in the environment, which allowed the treatment plant to be located directly in residential buildings and reduced the land area for the treatment plant. At the same time, there is a large reserve and unrealized opportunities in the processing of sludge in terms of reducing energy costs for conducting the wastewater treatment process and the processing of sludge into organic fertilizer.

The objective of the invention is to achieve a zero balance of waste from the sewage treatment plant into the environment while reducing the amount of air used at the treatment plant for the wastewater treatment process, energy costs for processing and preparing for disposal of sewage sludge.

The tasks are solved in that a method of non-waste biological treatment of wastewater and processing of separated sludge, including filtering wastewater in grates, mechanical cleaning in sand traps with pressing and drying waste from the grates, equalizing wastewater costs by the hours of the day due to cost averagers, settling sewage water in primary sedimentation tanks to remove floating impurities and the bulk of suspended solids; biological wastewater treatment in step nitri-denitrification bioreactors with rec by recirculation of activated sludge and biocenoses attached to a fiber scrub head, additional treatment of wastewater in bioreactors with hydrobionts, including mollusks, dosing of phosphate binding reagents into water-insoluble compounds and their retention in after-treatment filters, isolation of secondary and thin layer sewage sumps, and sediment of primary sedimentation tanks and excess activated sludge treated with flocculants compacted in sludge compactors together with regeneration and wash water water, with filtrate silt from dewatering of sediment of primary sedimentation tanks, ultraviolet irradiation of purified water, the process of nitrogen removal from wastewater is carried out with the use of biocenosis of bacteria anammox kept on a fiber ruff nozzle, the air from the devices for mechanical treatment of effluents due to the ventilation system through blowers is directed on bioreactors of high-speed biological treatment, and part of the air spent in nitrifiers using electrocock devices aliticheskogo disinfection system ventilation dissipated into the ambient air, dewatered sewage sludge after mixing with sand from sand traps and organic filler from vegetable waste or food waste in rotary subjected biocomposting biobarabanah placed indoors and supplied with warm blast of hot air from a pressure air duct. After the processes of heating composted mixtures of sewage sludge with a filler from organic substances to a temperature of 80 ° C, decontamination of the mixtures and the death of insect larvae and helminth eggs, reducing the moisture of the biocompost to 50%, the compost is removed after packing in bags or containers that are closed for use as an organomineral fertilizers in the green economy of the village or for the restoration of disturbed areas or for further processing by vermicomposting to obtain biohumus and worm biomass.

An analysis of the known technical solutions related to the methods of wastewater treatment and processing of the selected sludge and waste from sewage treatment plants showed that technical solutions containing the same set of essential features as the claimed method were not found. This allows us to conclude that the claimed method meets the criterion of "novelty."

Analysis of the identified significant features distinctive from the prototype showed that such or similar features in known technological solutions with the manifestation of the same properties were not found, which allows us to conclude that the claimed method meets the criterion of "significant differences".

The claimed combination of essential features allows you to get a new, higher result, expressed by the deep disposal of waste treatment plant sewage with reduced energy costs and the amount of removed and used air. The allocated sewage sludge is odorless, compact and does not have a harmful effect on people and the environment.

The method is illustrated by the technological scheme of wastewater treatment and sludge treatment in closed block modules (Fig. 1) with rational placement of block modules on the site of the sewage treatment plant (Fig. 2), equipment layout inside the block modules (Fig. 3, 4, 5, 6, 7, 8).

The list of positions of the technological scheme of wastewater treatment and sludge treatment:

I. Block module of the mechanical wastewater treatment unit and cost averaging;

II. Block module of primary sedimentation tanks and denitrifiers;

III. Block module of nitrification of the first stage of nitrification;

IV. Block module of the second stage of nitrification, secondary clarification tanks for post-treatment and disinfection of purified water;

V. Block module of the unit for thickening and dewatering sewage sludge;

VI. Block module for blower and composting unit for sewage sludge mixed with filler;

1. The flow of source wastewater;

2. Lattices;

3. Garbage from grates;

3 ′. Garbage dump from grates;

4. Sand traps;

four'. Sand trap from sand traps;

5. Tanks of averagers of wastewater costs;

5'. Pumps for supplying an average flow rate of wastewater;

6. Primary sedimentation tanks;

7. Reagents for the intensification of the sedimentation process in primary sedimentation tanks;

8. Pumps for pumping sludge from primary sedimentation tanks 6 to block module V for dewatering apparatus 28;

8'. Sedimentation of primary sedimentation tanks;

9. Denitrifiers;

10. The ventilation system of the block modules I and II;

11. Hoisting equipment;

12. Means of automated control over the composition of wastewater and air;

13. Ruff nozzle in cartridges;

14. Bubblers of regeneration of a brush nozzle;

15. Nitrification of the first stage of nitrification;

16. Bubblers of aeration of the sludge mixture in nitrifiers;

17. Gas discharge air treatment unit;

18. The catalytic unit for the decomposition of the components of the exhaust air dispersed into the air basin;

19. Nitrification of the second stage;

20. Secondary thin-layer sedimentation tanks;

21. Transfer pumps return 21 ′ and excess 21 ″ activated sludge;

22. Bioreactors of wastewater treatment;

23. Pumps for pumping regeneration water for post-treatment;

24. Wastewater treatment filters;

25. Contact tanks;

26. Desiccants of regeneration water and excess activated sludge;

27. Preparation of reagents for the intensification of sludge compaction and dewatering of sediments;

27 ′. Flocculant dissolution tanks;

28. Sewage sludge dewatering apparatus;

29. Sludge from sludge dewatering apparatus;

30. Kek;

31. UV irradiation device for treated wastewater;

32. Hopper for mixing dehydrated sewage sludge and filler;

33. Screw pumps for pumping dehydrated sewage sludge;

34. The conveyor feeding the filler into the mixing hopper;

35. Blowers;

36. Pressure ducts;

37. Composters of continuous biocomposting a mixture of sediments with a filler;

38. Storage compost bin;

39. Conveyor feed finished compost into the storage hopper 38;

40. Pipelines for supplying ventilation air to blowers 35;

41. Pipelines for supplying ventilation air to blocks 17 and 18;

42. The flow of treated and disinfected wastewater;

43. Vermicomposters;

44. Sieve for separating worms from vermicompost;

45. Filler.

The feed wastewater stream (Fig. 1) enters the sewage treatment plant (WWTP) into the receiving chamber 1 ′, from which it is distributed to the grates 2, and then to the sand traps 4 and then to the tanks 5 of the wastewater flow averagers. Equipment and tanks 2, 3, 4, 5 belong to the mechanical wastewater treatment unit and cost averaging. Block module I (Fig. 3) is equipped with a system 10 of forced ventilation of the premises, waste accumulators 3 ′ from the grilles 2, sand collectors 4 ′ from the sand traps 4, lifting equipment 11 for mounting and dismounting equipment, removing waste 3 ′ and sand pulp 4 ′ from block module I.

Through pumps 5 ′ from the averagers 5, the wastewater is sent to the primary settling tanks 6 of a thin-layer sedimentation. To intensify the process of sedimentation, a reagent, flocculant 7 (high molecular weight biodegradable organic matter) is introduced into pressure pipelines. From the primary settlers 6, the clarified wastewater flows by gravity to the denitrifiers 9 of the block module II (Fig. 4). The sediment of the primary sedimentation tanks 6 by means of pumps 8 is pumped into the block module V (Fig. 7) in the node for dewatering sewage sludge.

Block II is equipped with a forced ventilation system 10, automated control means 12 for the composition and flow of wastewater, as well as lifting equipment 11 for mounting and dismounting the brush nozzle 13 in the cassettes in the denitifiers 9. Bubbers 14 are placed on the bottom of the denitrifiers 9 under the ruff nozzle 13 regeneration of the brush nozzle, to which through pressure ducts 36 it is possible to supply air from blowers 35 through shut-off and control valves periodically according to a certain schedule.

The denitrifiers 9 have a supply through the pressure pipelines of the return activated sludge from the pumps 21 located in the block module IV (Fig. 6).

From block module II, wastewater flows by gravity into block module III (Fig. 7) of the first nitrification step. Block module III is equipped with a system of bubblers 16 for aeration of the sludge mixture, a brush nozzle 13 in the cassettes, lifting equipment 11 for mounting and dismounting cartridges with a brush nozzle 13 and bubblers 16. The ventilation system 10 has two air outlets. One terminal supplies air to the blowers 35, and the other to the gas discharge processing unit 17, because contains impurities that cannot be dispersed into the air basin. Monitoring the composition of the air in different areas of the block module III is carried out by automated 12 control means, which the block module III is equipped with. From block module III, waste water in the form of a sludge mixture flows by gravity to block module IV (Fig. 6), first to the second stage of nitrification 19, which also has a brush nozzle 13 in the cartridges, and sludge mixers 16 provided with a constant flow air from blowers 35 through pressure ducts 36. Thin-layer secondary sedimentation tanks 20, equipped with pumps 21 for transferring return activated sludge to sludge compactors 26, located in block module V, are built into the nitrifiers 19 of the second nitrification stage (Fig. 7).

From the secondary settling tanks 20, the treated wastewater flows by gravity into the bioreactors 22 aftertreatment with brushes of the brush nozzle 13. At the same time, the aeration bubblers 14 work continuously, and the regeneration bubblers 16 are switched on via shut-off and control valves only according to the schedule established by the readings of automated composition control means 12 Wastewater. During the regeneration period of one of the compartments of the bioreactors 22 of the wastewater treatment, regeneration water from this compartment is discharged by pumps 23 to the sludge compactors 26 of the module V. The purified water after the bioreactors 22 is mixed with reagents that bind phosphates to water-insoluble substances AlPO ₄ or FePO ₄ , and enters the filters 24 wastewater treatment. The treated water is mixed with a disinfecting reagent, for example hypochlorite, and flows into the contact tank 25 or enters the UV decontamination device of cleaned wastewater 31, and then is discharged by stream 42 for technical use or irrigation of green spaces. The washing water from the regeneration of the filter load 24 is also diverted to the sludge compactors 26 of the V module. Since the phosphate content in the wastewater is small after biological treatment, the addition of a metal-containing reagent does not significantly affect the composition of the sewage sludge, therefore it will not affect the fertilizer properties obtained after composting and subsequent vermicomposting of organic fertilizer. Precipitation from primary sedimentation tanks at a moisture content of about 95%, and precipitation condensed in sludge compactors 26 to a moisture content of 98%, after mixing with the flocculant from solution tanks 27 using pumps 8 of primary sumps or sludge compactors 26, are fed to the sludge dewatering apparatus 28. After dewatering, cake 30 is pumped by screw pumps 33 into a hopper for mixing dehydrated sewage sludge with a filler 45 consisting of shredded plant waste, such as sawdust, food waste, grass, straw, etc. The moisture content of the mixture should not exceed 80%. Sludge water from sludge dewatering is sent to sludge compactors 26, and after sludge separation, 5 wastewater discharges are averaged. A mixture of cake 30 with filler 45 from mixing hopper 32 is loaded into composters 37 for continuous bio-composting of the mixture by means of thermophilic aerobic microorganisms. The biocomposting process lasts no more than 5 days and ends when the temperature in the biocomposters reaches 80 ° C. Since the biocomposters 37 are located in the block module VI together with the blowers 35 and are supplied with hot air through the pressure ducts 36, since the composting process is aerobic and requires air oxygen, additional heat supply to the biocomposting room is not required.

It is known that the sediment of primary sedimentation tanks at a humidity of 70% in the summer begins to warm up on the third day already. During the decomposition of 1 kg of ashless matter, the precipitate is released under aerobic conditions of 4 kJ of thermal energy. Of course, it is advisable to inoculate a mixture of sediments with a filler specific for a particular wastewater composition and type of filler with a biocenosis of thermophilic microorganisms. At a temperature of 80 ° C, helminth eggs, insect larvae, pathogenic organisms die, the mixture decreases by 50%. Ready compost is harmless and can be transported in closed containers from hoppers 38 for accumulating the finished compost to reclamation of disturbed areas, to greenhouse composting compartments or to composting sites under natural conditions.

Block modules I-VI are placed on the site of the treatment plant (Fig. 2) so that the pipelines of the communications for the flow of wastewater, sludge pumping, and air supply are of a minimum length. Carbon dioxide emitted in denitrifiers, as well as gaseous organic substances in ventilation air from gratings, sand traps 4 are useful for biological wastewater treatment in nitrifiers 15 and 19, therefore, ventilation air from block modules I and II is sent to block module VI to the inlet blowers 35. At the gas-discharge or catalytic treatment unit 17 and 18, the exhaust air comes only from the unit of the module III, since it is in this exhaust air that substances harmful to dispersion in air can be contained ear basin over the territory of CBS. It is advisable to transport the garbage from grates 3 to a waste sorting station, and sand in the form of sand pulp 4 ′ to be pumped to the bunker 32 for mixing with other dehydrated sludge from the treatment plant, since in the sand pulp 4 ′ organic matter constitutes half of the dry matter. And sand is useful for worms in subsequent vermicomposting. The presence in the technological scheme of the treatment plant of the averagers of 5 wastewater costs allows you to reduce the required number of blowers and the volume of sedimentation tanks and bioreactors for wastewater treatment, calculated in accordance with the design standards for the maximum hourly flow rate, and it can significantly be more than the average flow rate. Placing the brush nozzle 13 in the cassettes in the denitrifiers 9 allows the accumulation and preservation of the biocenosis of autotrophic bacteria anammox, and this reduces the amount of recirculated sludge return flow and the need for air for nitrification of ammonium nitrogen. The value of the recirculation flow of the return activated sludge in the presence of bacteria of the biocenosis anammox in denitrifiers 9 varies depending on the amount of ruff nozzle 13 in stream 1 of the initial wastewater. The choice of its value is made in the design of WWTP. The amount of ruff nozzle 13 in both stage nitrifiers and bioreactors 28 for wastewater treatment is dictated by the quality standards of treated water for a particular treated water reservoir or the quality requirements of industrial water when using treated wastewater for industrial needs. The patterns of the work of microbial communities in bioreactors with complexes attached to a brush nozzle and free-floating activated sludge are given in [3].

When designing composters for biocomposting a mixture of dehydrated sludge of primary sedimentation tanks, excess activated sludge and filler 45, it is necessary to calculate the amount of both types of sediment in the mixture and the type of filler 45, as well as the conditions created by blowers 35 and hot air ducts in block module VI, and they depend from the composition of wastewater and climatic conditions at the site of the planned WWTP. The dimensions of one of the continuous composters 37 depend on the amount of dehydrated sludge emitted and the introduced filler, as well as on the size of block module VI and the duration of biocomposting under the specific conditions of the designed WWTP. Vermicomposters 43 and sieves 44 for separation of worms and vermicompost are located in greenhouses outside the sewage treatment plant.

Currently, the heat generated during the operation of the blowers and carried away with hot air is not used on any WWTP, therefore, we can focus on evaluating the savings in energy costs of processing sludge in comparison with the prototype, in which sludge is dried when processing sludge at a temperature of 240 ° C to a moisture content of 10 ... 25%. As for saving energy costs for wastewater treatment and sludge processing, it is shown in Example 1.

Example.

A sewage treatment plant with a capacity of 5000 m ³ / day receives wastewater from the population with a water discharge rate of 200 l / person · day at k _total = 1.7. The maximum hourly flow rate is 5000: 24 · 1.7 = 354 m ³ / h. Cost Averager 5 should have a volume of at least 10% Q _day , i.e. 500 m ³ and after the averager 5 hour consumption will be 5% Q _day = 250 m ³ / h. The composition of the wastewater will be characterized by the following values: suspended solids - 325 g / m ³ , BOD _full - 375 g O ₂ / m ³ , ammonium nitrogen - 40 g N / m ³ , phosphorus - 1.5 g P / m ³ .

The volume of the averager 5 requires that the diameter of the block module I be 12 m and the height of the water layer is 5 m.

Primary sedimentation tanks 6, with a load on the shelf thin-layer sedimentation tanks of 3 m ³ / m ² · h, should have a shelf space of 250 m ³ / h: 3 = 83 m ² , height 2.5 m, volume about 240 m ³ . The share of denitrifier 9 out of 500 m ³ remains 500-240 = 260 m ³ , which corresponds to the half-hour residence time of the mixture of the initial effluent and return activated sludge.

In primary sedimentation tank 6, about 50% of suspended solids precipitate, i.e. per day Q _OS = 5000 · 325 · 0.5 = 812.5 kg / day. At a humidity of 95%, the sediment volume will be 812.5: 50 kg / m ³ = 16.25 m ³ / day. The composition of the effluent after the primary settling tanks 6 will be as follows: suspended solids - 162.5 g / m ³ , BOD _full - 225 g O ₂ / m ³ , ammonium nitrogen - 40 g N / m ³ , phosphorus - 1.5 g P / m ³ .

The volume of the first stage of nitrification 15 should correspond to a two-hour residence time of the mixture of the initial averaged runoff and return activated sludge at a ratio of 1: 1, i.e. with a total flow rate of 500 m ³ / h, the volume should be equal to 1000 m ³ , and with a water layer of 5 m, the diameter of the reservoir of the block module II needs 16 m.

For the second stage of nitrification 19 (block module III) with a tank diameter of 16 m and a water layer height of 5 m with a mixture residence time of 1 hour, the step volume should be 500 m ³ , the area of the water of secondary settling tanks is 20-83 m ² , volume 240 m ³ . The volume of bioreactors 22 aftertreatment is also 240 m ³ , the volume of aftertreatment filters 24 is about 50 m ³ , the total volume of block module III is not more than 1000 m ³ .

The amount of excess activated sludge growth Pr = 0,8 · C ₁ + 0,3BPK _full = 0.8 · 162 + 0.3 · 220 = 130 + 66 = 200 g / m ^3, and the daily weight of 5000 m ³ / day 200 = 1000 kg / day. When the moisture content of dehydrated sludge is 88%, its volume will be 8.3 m ³ / day, and the sediment of primary sedimentation tanks - 4 m ³ .

The amount of added sawdust is at least 2.5 m ³ / day. In a mixture with filler 45, the volume will be 15.0 m ³ / day. For the total sediment of primary sedimentation tanks 4 m ³ / day and a mixture of sludge with sawdust 11.25 m ³ / day, the volume of precipitation with a moisture content of not more than 80% will be 15.0 m ³ / day. Such a volume will require not take less than 5 biokomposterov load from biokomposter 37 1 day to 3 m ³ / day at a volume of 15 m ³ composter. Composting time - 5 days.

To heat the sediment introduced into the volume of one biocompost 37 at 40 ° C, a heat input of 3,000 l / day · 40 ° C · 1 kcal / l · ° C = 120,000 kcal / day is required.

When drying the sediment at 3000 l / day, thermal energy is required to heat up to at least 100 ° C, i.e. 90 ° C: 3000 l / day · 90 ° C · 1 kcal / l · ° C = 270,000 kcal, which is almost three times more than for biocomposting.

Compost moisture will decrease to 50%, dry matter decomposition will be at least 20%, so the daily volume of compost with a dry matter weight of 2600 kg · 0.8 = 2080 kg and a humidity of 50% (dry matter in compost 500 kg / m ³ ) will be about 4.0 m ³ / day Half of this volume is directed to use in the green economy of the city, i.e. 2.0 m ³ / day, and 1/2 for vermicomposting - 2 m ³ / day. The load on one vermicomposter 43 <0.5 m ³ / day · pcs. 27 vermicomposters with a diameter of 2 m and a height of 3 m are required for two-month vermicomposting of sewage sludge.

From compost, no more than 1.6 m ³ / day of biohumus is obtained with a humidity of 40% and up to 50 kg of biomass of worms per day.

The proposed method of non-waste biological treatment of wastewater and the treatment of precipitates as follows.

The flow of the original waste water 1 enters the block module I and is first filtered in gratings 2, freeing itself from large mechanical impurities (waste). Garbage 3 from the gratings 2 is accumulated in the storage tanks 3 ′, and then taken to a garbage recycling plant. After the gratings 2, the wastewater flows by gravity into the sand traps 4, where sand falls out of them in the form of sand pulp 4 ′. During operation, 4 ′ sand pulp is mixed with dehydrated sludge and dehydrated in biocomposters 37. After sand traps 4, wastewater enters the 5 cost averager. From the reservoirs of the flow averager 5, the wastewater pump 5 ′ is supplied in a uniform flow to the block module II (Fig. 1) first to the primary clarifiers 6, and then to the denitrifiers 9. In the primary clarifiers 6 due to the addition of reagents 7, half of the suspended substances of wastewater. The sludge of the primary sedimentation tanks 6 by means of pumps 8 together with the flocculant of the tanks 27 ′ of the reagent preparation unit 27 is pumped to the block module V (Fig. 7) in the sludge dewatering apparatus 28. Of the denitrifiers 9, the wastewater treated with the biocenosis of the Anammox bacteria attached to the brush nozzle 13 and the free-floating sludge of the denitrifying biocenosis of activated sludge under anoxic conditions flows by gravity together with the return activated sludge 21 ′, which enters the denitrifier 9 using pumps 21 from the secondary thin-layer 20 , to the nitrification 15 of the first stage of nitrification in block modules III (Fig. 5), where the communities of free-floating activated sludge microorganisms and biocenosis attached to the brush nozzle 13 bacteria nitrification is processed under aerobic conditions for two hours. The ruff nozzle 13 is periodically regenerated by bubblers 14, which are located in addition to the main bubblers 16 of the nitrification 15 under the cartridges 13. Then, the sludge mixture flows by gravity into the block module IV (Fig. 6) into the nitrification 19 of the second nitrification stage combined with thin-layer settlers 20. The clarified wastewater after the secondary thin-layer settlers is controlled by means of 12 automated control of the composition of the wastewater as wastewater after the primary settlers 6 and flows by gravity into the bioreactor 22 s post-treatment of wastewater. Excess activated sludge is discharged by a 21 ″ stream to sludge compactors 26 located in the block module V (Fig. 7), together with the regeneration waters of the bioreactors 22 of the wastewater treatment.

In bioreactors 22 of wastewater treatment, the biocenosis of hydrobionts attached to the brush nozzle 13 works, including small animal predators (ticks, worms, mollusks), therefore, the regeneration of the brush nozzle 13 is performed once a week. Bioreactors 22 use aeration through airlift niches, and sparging through a nozzle 13 is carried out only during its regeneration. The reagent from the site 27 for binding phosphorus to the water-insoluble compound AlPO ₄ or FePO _{4 is} added to the overflow from the bioreactors 22 of the post-treatment to the post-treatment filters 24. In the filters 24, the phosphates are retained and the contact reservoirs 25 and the UV dewatering unit 31 receive the purified water 42 already of standard quality. The regeneration water of the post-treatment filters 24 is also diverted to the sludge compactors 26, and then to the apparatuses 28 of the block module V (Fig. 7) of sludge dewatering.

Cake 30 from the sludge dewatering apparatus 28, together with the filler from the hopper 32, coming through the conveyors 34 after mixing, is sent to the containers 37, and the sludge 29 is discharged to the cost averagers 5.

The finished compost from the composters 37 enters the hopper 38 through the conveyor 39, from where it is transported for recycling to the city’s green economy or to the second stage of composting-vermicomposting, located outside the sewage treatment plant. Compost that has undergone vermicomposting in vermicomposters 43 is divided in screens 44 into vermicompost and worms and is used for agricultural purposes.

The I-VI block modules are controlled by system 12 for air composition and are provided with an exhaust or forced ventilation system 10, 40, 41 for supplying to gas cleaning means 17, 18 or for supplying to blowers 35 and through a system of bubblers 14 and 16 via pressure ducts 36 to aerobic nitrification bioreactors, post-treatment and biocomposters 37.

The tasks set in the claimed invention have been completed. Energy costs are reduced by at least three times with a zero balance of waste into the environment.

Claims (1)

A method of biological wastewater treatment with the treatment of precipitates, including filtering water to isolate mechanical impurities, settling to remove sand from wastewater, averaging wastewater costs by hours of day, and then discharging wastewater to sediment wastewater treated with flocculant in primary sumps, for separation of the bulk of suspended solids and partially dissolved organic impurities, denitrification of nitrates of return activated sludge, in anoxide-type bioreactors equipped with EP a new nozzle for retaining the biocenosis of bacteria anammox, nitrification of ammonium nitrogen in two-stage bioreactors equipped with a ruff nozzle, sedimentation of sludge mixtures in thin-layer secondary settling tanks, recycling of activated sludge into denitrifiers, additional treatment of wastewater in bioreactor pumps equipped with bioreactor pumping , phosphate binding by reagents, filtration of cleaned wastewater, disinfection of treated water by UV irradiation or by the addition of reagents, dehydrated the raw sludge extracted in the primary settlers and the excess activated sludge discharged after reagent treatment for thickening into sludge compactors, characterized in that composters in the form of rotating drums with composting duration of no more than a few years are used for processing, dehydration and decontamination of dehydrated sludge 5 days when the temperature in the composters reaches 80 ° C and the filler is added before composting to the dehydrated sediments of the crushed vegetable waste and food waste, or when placing composters indoor blower and involve composting pressurized hot air duct as the source of oxygen for the aerobic thermophilic microorganisms composting.

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