CN100500593C - Compound sewage treatment method and device - Google Patents

Abstract

This invention discloses composite wastewater treatment method and apparatus. The method comprises: introducing wastewater to be treated into the circulation clarification pool at the upper part of the apparatus via the adjustment pool to form a high-level hydraulic head, performing physicochemical coagulation reaction and microbe metabolism in the reaction zone of the circulation clarification pool, introducing wastewater from the reaction zone into the clarification zone, precipitating the suspended substances in the wastewater by gravity into the bucket on the cone wall of the clarification zone, discharging into the sludge pool by water static pressure, collecting the clear water at the upper layer by a water tank, introducing to the bottom of the anaerobic pool by a vertical pipe, performing anaerobic treatment on the wastewater, introducing the wastewater into the aerobic pool from the anaerobic pool, performing microbe metabolism, returning part of the water in the aerobic pool to the anaerobic pool for nitrification and reverse nitrification to remove P and N, introducing the rest wastewater into a precipitation pool, solid-liquid separating, discharging the solid by water static pressure into the sludge pool, introducing the liquid at the upper layer into the water tank, and sterilizing by sterilization equipment for recycling.

Description

Compound sewage treatment method and device

Technical field

The invention belongs to the technical field of sewage treatment, and mainly relates to a compound sewage treatment method and device.

Background technique

The recycling of sewage is an important measure for human beings to protect the ecological environment and solve the shortage of water resources. Cities and towns are the main sources of sewage. General urban sewage includes domestic sewage, industrial wastewater and runoff sewage. The water generally contains suspended solids, aerobic organic matter, plant nutrients-nitrogen and phosphorus, and pathogens. At present, domestic and foreign sewage treatment can be generally divided into physical and chemical treatment process, biochemical treatment process and biochemical physical and chemical treatment process.

The physical and chemical treatment process is to add drugs to sewage to cause coagulation reaction, so that colloidal particles form flocs, and sewage treatment is realized through precipitation. Although this treatment technology has a good effect on the removal of suspended solids in sewage, its removal rate for organic pollutants is limited, and it has almost no effect on the removal of nitrogen and phosphorus in sewage. With the continuous improvement of the country's sewage discharge standards, this treatment technology is no longer used alone. And the device it adopts is arranged in a plane, occupies a large area, and has high investment costs, and the conversion of sewage between individual facilities must be completed by power equipment (water pumps), resulting in increased operating costs for sewage treatment.

The biochemical treatment process is currently a commonly used treatment technology (A/A/O process), which creates anaerobic, anoxic, and aerobic regions in time and space to achieve anaerobic-aerobic (A /O) phosphorus removal, aerobic-anoxic (O/A) denitrification purpose. Commonly used biochemical treatment processes mainly include activated sludge process, such as oxidation ditch process and SBR process.

The SBR method is a process that operates strictly in chronological order in a tank. It has a high removal rate of organic matter, achieves the purpose of phosphorus and nitrogen removal, and does not require secondary sedimentation tanks and sludge tanks to return. The equipment investment and floor area are reduced, but for a single SBR reactor to continuously feed water, a larger regulating tank is required; for multiple SBR reactors, the automatic switching of the water inlet and drain valves is frequent, and the utilization rate of system equipment is low. Low, complex control, once the sludge flows out, it will cause secondary pollution.

Oxidation ditch process is a kind of end-to-end circulating flow, which embodies the characteristics of "A/O" process and solves the problem of phosphorus and nitrogen removal. It is one of the most widely used sewage treatment processes at present, but this process is harmful to Species (SS) removal is limited. Because each unit of this treatment process is arranged in a plane, it not only occupies a large area, but also has high investment costs, and the conversion of sewage between individual facilities must be completed by power equipment (water pumps), resulting in increased operating costs for sewage treatment.

The purpose of the biochemical treatment process is to organically combine the coagulation reaction of physical and chemical dosing with the metabolism of biochemical microorganisms to improve the efficiency of pollutant removal. However, although the biochemical and biochemical treatment processes currently used in sewage treatment have the process characteristics of physical and chemical treatment and biochemical treatment, their physical and chemical treatment and biochemical treatment in sewage treatment are realized in each individual facility in the process, that is, physical and chemical treatment. The drug coagulation reaction is completed in the physical and chemical treatment process section, and the metabolism of biochemical microorganisms is completed in the biochemical treatment process section, which fails to achieve the combined treatment of physical and chemical processes and biochemical processes. In addition, its treatment facilities are still in the traditional layout, and the conversion of sewage between individual facilities still needs to be completed by power equipment. There are still problems of high equipment investment, high energy consumption, large floor space and high operating costs.

The purpose of the present invention arises from this, and proposes a compound sewage treatment method, which organically combines the physical and chemical dosing coagulation reaction with the metabolism of biochemical microorganisms through process compounding, so as to improve the efficiency of pollutant removal; the proposed device not only solves the problem of sewage It solves the problems of large equipment investment, high energy consumption, and large floor area, and uses the initial high water head to realize the full self-flow, which effectively reduces the high operating cost.

The process steps taken by the present invention to realize the above method are: the treated sewage enters the regulating tank at the lower part of the device and stays for a certain period of time, and performs anaerobic treatment on the sewage, that is, completes the biochemical "A" section process; enters the inverted conical first stage from the regulating pond The sewage in the reaction zone is sprayed from bottom to top by the nozzle after being dosed before the pump, so that the treated sewage can obtain physical and chemical coagulation reaction. At the same time, the metabolism of biochemical microorganisms is obtained, and the first combination of physical and chemical processes and biochemical processes is completed; the sewage overflowing from the upper end of the first reaction zone enters the second reaction zone set around the first reaction zone to form a hydraulic cycle to be treated Sewage undergoes physical and chemical coagulation reaction again, and at the same time, through the aeration pipe set in the second reaction zone, the sewage can obtain the metabolism of biochemical microorganisms again while undergoing physical and chemical coagulation reaction again, and a part of the sewage treated in the second reaction zone is refluxed After entering the first reaction zone, another part of the sewage enters the inverted cone-shaped clarification zone through the channel at the lower part of the second reaction zone, and the suspended matter settles under the action of its own weight into the mud collecting hopper set on the cone wall of the clarification zone and flows into the water body. It is discharged into the sludge tank under static pressure, and the clean water on the upper surface is collected by the water receiving tank and sent to the bottom of the anoxic tank through the standpipe. The circulating clarification tank composed of the first reaction zone, the second reaction zone and the clarification zone is located in the device The upper part of the upper part forms a high water head; the anoxic pool is located under the circular clarification tank, and there is a filler in it, and the anoxic treatment is performed on the treated sewage entering it, that is, the biochemical "A" section process is completed; the anoxic pool The treated sewage flowing into the aerobic pool passes through the aeration tube set in it so that the sewage can be metabolized by biochemical microorganisms to complete the biochemical "O" stage process, and part of the water in the aerobic pool flows back into the anoxic pool to form nitrification and reaction. Nitrification, complete the process of dephosphorization and nitrogen removal; the solid-liquid separation is obtained from the treated sewage flowing into the sedimentation tank from the aerobic tank, and the separated solid part is discharged into the sludge tank from the bottom under the static pressure of the water body, and the separated liquid part It flows into the water storage tank from the upper part, and is reused after being sterilized by the disinfection equipment; part of the sludge in the sludge tank flows back to the circulating clarifier and the aerobic tank to realize the activated sludge reaction, and the remaining part is removed by the dehydration equipment before being transported out.

The device adopted by the present invention to realize the above method is: the adjusting tank for anaerobic treatment of sewage is located at the bottom of the device, and the circulating clarifier for compounding the physical and chemical process and the biochemical process is located at the upper part of the device, and the circulating clarifier is an inverted cone structure. In the cone, nozzles, mixing mantle throats and expansion tubes are arranged sequentially from bottom to top. Inside the expansion tube is the first reaction zone. Both the reaction zone and the second reaction zone are equipped with aeration tubes, and the clarification zone is between the diversion body, the expansion tube and the inner wall of the cone. The sludge discharge pipe is connected to the sludge tank, and a plurality of water collection tanks connected to the ring-shaped sump are evenly distributed on the upper end of the clarification area, and a riser connected to the anoxic tank is arranged in the ring-shaped sump; A pressurized pump and a chemical feeder are installed between the clarification tanks. The inlet of the pressurized pump is located in the regulating tank, the outlet is located in the circulation clarifier, and the discharge port of the chemical feeder is located at the inlet end of the pressurized pump; There is a sludge tank next to the pool, and its outlets are respectively connected with the circulating clarifier, the aerobic tank and the sludge dehydrator; Next to it, it communicates with the anoxic tank through pipelines, and there are fillers and aeration pipes inside. An annular water distribution tank is set on the outer wall of the aerobic tank. There are multiple water distribution pipes in the annular water distribution tank, and the multiple water distribution pipes correspond to the sedimentation tank. The bottom of the cone; there is a sedimentation tank around the aerobic tank, and the bottom of the sedimentation tank is divided into multiple independent cones. The lower part of each cone is equipped with a pipe connected to the sludge tank. The lower part of the periphery of the sedimentation tank is provided with a water storage tank, and a disinfection device is provided at the outlet of the water storage tank.

The present invention organically combines the physicochemical dosing coagulation reaction and the metabolism of biochemical microorganisms through process compounding, thereby improving the sewage treatment efficiency; the single facilities in the traditional sewage treatment process are designed from the plane layout according to the spatial sequence to The three-dimensional and vertical layout makes the whole equipment layout compact and the process shortened, which not only reduces the occupied area and investment cost, but also realizes the full self-flow by using the initial high water head, which effectively reduces the operating cost. Through the optimized combination and integration of each treatment unit, the combination of physical chemistry and biochemistry in the treatment process unit; the combination of activated sludge method and biofilm method; the combination of "AO" and "AAO" processes in biochemistry.

The circulating clarification tank designed by the invention integrates the floc coagulation reaction process, the biochemical aerobic-anoxic reaction process and the clarified mud-water separation process. It is installed at the uppermost part of the whole device, forming a high water head effect, realizing the full self-flow of the main sewage treatment system, reducing the number of power pumps used, and effectively reducing investment costs and operating costs. Sewage from the adjustment tank is sent to the first reaction zone by the nozzle for coagulation and flocculation after dosing before the pump, and forms a hydraulic cycle with the second reaction zone, which strengthens the effect of physical and chemical coagulation. The aeration devices installed in the first reaction zone and the second reaction zone create a metabolic environment for aerobic microorganisms. Thus, while completing the biochemical "O" process, the flocculation coagulation reaction process is completed, realizing the combination of physical and chemical technology. Compounding of biotechnology. The sewage entering the clarification zone from the second reaction zone completes the biochemical "A" stage process here. The clear water surface layer formed in the clarification zone is collected through the water collection tank to the water collection tank and sent to the bottom of the anoxic tank through the standpipe; the formed sewage The coarse particle suspension in the mud suspension layer settles into the mud collecting hopper under the action of weight, and is discharged into the sludge thickening tank under the static pressure of the water body.

The regulating pool designed by the present invention is located at the lower part of the whole device, and has the function of regulating water volume, uniformity and water quality, and ensuring the stable operation of subsequent equipment. Sewage stays here for more than 2 hours under non-anaerobic (anoxic) conditions. Through the action of hydrolytic acidification bacteria, the large molecules in the pollutants in the water are changed into small molecules, the ring chains become straight chains, and the long chains become short chains. , to convert refractory substances into degradable substances, further improve the biodegradability of wastewater, and create conditions for biochemical aerobic removal of pollutants. Together with the circulating clarifier to complete the combination of biochemical "AO" process.

The anoxic tank designed by the present invention utilizes anaerobic microorganisms to degrade the difficult-to-degrade organic matter in sewage under anoxic conditions, completes the biochemical "A" stage process, and creates conditions for the aerobic stage. Since the sewage entering the anoxic tank is tangentially swirled from the bottom and enters the aerobic tank, the backflow formed not only prevents sludge deposition, but also achieves the purpose of phosphorus and nitrogen removal.

The aerobic pool designed in the present invention oxidizes and decomposes the organic matter in the sewage through biological oxidation, completes the biochemical "O" section process, and achieves the purpose of purification. Compared with the traditional biofilm method, this method has the following characteristics: 1. All the fillers for microorganisms to inhabit are immersed in water; 2. Mechanical equipment is used to oxygenate the sewage, which is different from general biofilters, which rely on natural ventilation for oxygen supply; 3. There is a certain amount of activated sludge in the sewage in the pool, which is in a suspended state under the strong disturbance of the updraft. When in contact with the sewage, it can fully maintain high activity and improve the purification efficiency. Therefore, this section not only has the characteristics of activated sludge method, but also has the advantages of biofilm method. It is connected with the anoxic pool and reflows locally to further remove organic matter and denitrify and dephosphorize. Thus, the sewage has completed the AAO process of biochemical treatment from the clarification area through the anoxic pool to the aerobic pool. At the same time, a transcendence pipe is set in the clarification area to directly connect with the aerobic tank, so that in the sewage treatment, the anoxic tank can be used or idled according to the water quality status, and the conversion of AAO and AO processes in biochemical treatment can be realized.

The sedimentation tank designed by the present invention adopts a vertical flow structure, and the exfoliated biofilm from the aerobic tank can be separated into solid and liquid, and the separated solid part is discharged into the sludge concentration tank under the static pressure of the water body, and the separated liquid part Into the storage tank, pathogens are killed by ultraviolet disinfection equipment, so that the discharged water meets the requirements of reclaimed water recycling; the designed sludge dehydration equipment can remove a large amount of water in the sludge, reduce the weight of the sludge, facilitate transportation, and avoid secondary pollution at the same time.

Description of drawings

Accompanying drawing 1 is process flow diagram of the present invention.

Accompanying drawing 2 is the schematic diagram of the plane structure of the invention.

Accompanying drawing 3 is the schematic cross-sectional structure diagram of Fig. 2A-A.

Accompanying drawing 4 is the structure schematic diagram of the circulating clarifier of the invention.

Accompanying drawing 5 is the top view of the present invention.

Accompanying drawing 6 is the schematic cross-sectional structure diagram of Fig. 2B-B.

In the figure: 1. Regulating tank, 2. Dosing and feeding machine, 3. Booster pump, 4. Circulating clarifier tank, 5. Anoxic tank, 6. Aerobic tank, 7. Sedimentation tank, 8. Water storage tank, 9. Disinfection device, 10. Sludge tank, 11. Blower, 12. Slurry pump, 13. Sludge dewatering machine, 14. Cone, 15. Nozzle, 16. Mixing cover, 17. Throat pipe, 18. Expansion pipe , 19, guide body, 20 first reaction zone, 21, second reaction zone, 22, clarification zone, 23, mud collecting bucket, 24, standpipe, 25, water receiving tank, 26, annular water collecting tank, 27, mud discharge Pipe, 28, filler, 29, aeration pipe, 30, annular water distribution tank, 31, water distribution pipe, 32, pipeline, 33, overflow weir, 34, sludge storage tank, 35, landscape pool, 36, column.

has implementation

In conjunction with accompanying drawing, provide embodiment of the present invention as follows:

The sewage treatment method adopted in this embodiment is: the treated sewage enters the regulating tank at the lower part of the device and stays for more than 2 hours, anaerobic treatment is performed on the sewage, and the biochemical "A" section process is completed; the regulating pond enters the inverted conical first The sewage in the reaction zone is sprayed from bottom to top by the nozzle after being dosed before the pump, so that the treated sewage can obtain physical and chemical coagulation reaction. At the same time, the metabolism of biochemical microorganisms is obtained, and the first combination of physical and chemical processes and biochemical processes is completed; the sewage overflowing from the upper end of the first reaction zone enters the second reaction zone set around the first reaction zone to form a hydraulic cycle to be treated Sewage undergoes physical and chemical coagulation reaction again, and at the same time, through the aeration tube set in the second reaction zone, the sewage obtains the physical and chemical coagulation reaction and the metabolism of biochemical microorganisms again, completing the second phase of the physical and chemical process and biochemical process. complex. Part of the treated sewage flows back into the first reaction zone, and the other part of the sewage enters the inverted cone-shaped clarification zone from the lower part of the second reaction zone. The upper mud collecting hopper is discharged into the sludge tank through the pipeline under the static pressure of the water body. The clear water on the upper surface is collected by the water collecting tank and then sent to the bottom of the anoxic tank through the standpipe. The first reaction zone, the second reaction zone The circulating clarification tank composed of the clarification zone and the clarification zone is located on the upper part of the device, forming a high water head; the anoxic tank is located under the circulating clarification tank, and there is a filler in it, and the anoxic treatment is performed on the treated sewage entering it, that is, the biochemical process is completed. The "A" section of the process; the treated sewage from the anoxic pool flows into the aerobic pool through the aeration tube set in it to make the sewage get the metabolism of biochemical microorganisms, that is, to complete the biochemical "O" section process, in the aerobic pool Part of the water flows back into the anoxic tank to form nitrification and denitrification to complete the process of dephosphorization and nitrogen removal; the treated sewage flowing into the sedimentation tank from the aerobic tank realizes solid-liquid separation, and the separated solid part is separated under the static pressure of the water body. The bottom is discharged into the sludge thickening tank, and the separated liquid part flows into the water storage tank from the upper part, and is recovered after being sterilized by the disinfection equipment; the sludge part in the sludge tank is returned to the circulating clarifier tank and the aerobic tank to realize the activated sludge reaction, The remaining part is shipped out after being dehydrated by dehydration equipment.

The device that the present invention realizes above-mentioned method adopts is: as shown in Fig. 1 in conjunction with Fig. 2: it mainly consists of regulating tank 1, dosing feeder 2, pressurizing pump 3, circulating clarifier 4, anoxic tank 5, aerobic Pool 6, settling tank 7, water storage tank 8, disinfection tank 9, sludge tank 10, blower 11, mud pump 12 and sludge dehydrator 13 constitute. Regulating pool 1 is located at the lower part of the whole equipment, which is a closed pool body, and the volume of the pool body can allow the sewage to be treated to stay for more than 2 hours. Between the adjustment tank 1 and the circulating clarification tank 4, a pressurization pump 3, a dosing and feeding machine 2, a blower 11 and a sludge dehydrator 13 are arranged. The water inlet of the pressurization pump 3 is located at the bottom of the adjustment tank 1, and The water port enters the circulating clarifier 4 through the water pipe. The drug feeding and feeding machine 2 adopts commercially available products, and its feeding port sends the drug to the water inlet end of the pressurizing pump 3 through a pipeline, so as to realize drug adding before the pump. The drug added in this embodiment is a well-known bio-silicon drug, such as diatomaceous earth, which has a strong coagulation effect. The blower 11 communicates with the aeration pipe 29 in the circulating clarifier 4 and the aerobic tank 6 through pipelines, and the sludge dewatering machine 13 adopts a centrifugal (or belt) dehydrating machine, which is connected to the sludge storage tank through a mud pump 12. The pool 34 is connected, and the sludge storage pool 34 plays a transitional role, so that the sludge enters the sludge dehydrator 13 stably, and the work performance is improved. The sludge storage pool 34 is connected with the sludge pool 10 .

As shown in Fig. 3 in conjunction with Fig. 4: the circulating clarifier 4 is located at the top of the whole equipment, and it is a conical structure. This embodiment is an octagonal pyramid structure, and nozzles 15, The mixing cover 16, the throat pipe 17 and the expansion tube 18, the expansion tube 18 is an inverted tapered structure, and a diversion body 19 is arranged around the outer upper part of the expansion tube. The diversion body is a hollow columnar structure, and the lower part is supported by a cylinder 36. There is a channel communicating with the clarification area. Thus, a first reaction zone 20 is formed in the expansion tube 18, a second reaction zone 21 is formed between the outer wall of the expansion tube and the inner wall of the guide body, and a clarification zone 22 is formed between the guide body, the expansion tube and the inner wall of the cone. Both the first reaction zone 20 and the second reaction zone 21 are provided with an aeration tube 29 , and the aeration tube 29 is in a ring structure and is arranged on the inner and outer walls of the expansion tube 18 . On the inner wall of the cone 1, there are four mud collecting hoppers 23, respectively equipped with mud discharge pipes 27. The function of the mud collecting hoppers 23 is to collect the suspended solids in the clarification area 22, and pass through the mud discharge pipes under the static pressure of the water body. 27 into the sludge tank 10. Sludge tanks 10 are arranged at the four corners of the circulating clarifier 4, and three sludge outlets are arranged at the bottom, one of which is returned to the circulating clarifier 4 through a mud pump to realize the activated sludge reaction, and the other is passed through a mud pump. Return to the aerobic tank 6 to realize the activated sludge reaction, and the remaining one communicates with the sludge dehydrator 13 through the mud pump. As shown in Figure 5, a plurality of water receiving tanks 25 are evenly distributed on the upper end of the clarification area 22, and are arranged in a radial network. The other ends are all in communication with the annular sump 26 . The annular water collection tank 26 is located on the inner side of the upper end surface of the circulating clarifier, and is integrated with the circular clarifier. The water collected by the water receiving tank 25 enters the annular water collecting tank 26 and is sent to the bottom in the anoxic pool 5 by the standpipe 24 . The number of standpipes 24 can be determined according to the amount of water. In the present embodiment, there are two, symmetrically arranged. The purpose is to make the water entering the anoxic pool 5 form a swirling flow.

As shown in Figure 6: the anoxic tank 5 is located below the circulating clarifier 4, and a carrier for microbial growth and reproduction is provided in it - filler 28, and what the filler uses is a soft filler, the purpose is to decompose the organic matter in the sewage and In the process of generating AH ₄ SOC ₂ , the spacing of fillers is determined to meet the survival and reproduction of microorganisms. The outlet at the lower end of the standpipe 24 entering the anoxic pool 5 has an included angle (90 degrees in this embodiment), so that the sewage entering the anoxic pool swirls up to the aerobic pool 6 from the bottom in a tangential direction.

The aerobic pool 6 is located at the outside of the anoxic pool 5 and communicates with the anoxic pool through pipelines. The aerobic tank 6 is divided into multiple grids, which are arranged in parallel. The first grid is fed from the bottom, and the last grid flows into the sedimentation tank 7 from the upper part. The purpose is to ensure a high water head and flow into the sedimentation tank 7 automatically. The aeration pipe 29 is installed at the bottom in the aerobic tank 6, and the function one is to aerate and provide sufficient dissolved oxygen to the activated sludge microorganisms to meet the oxygen required in the metabolic process; the second is to stir and mix to make The activated sludge is in a state of vigorous agitation and suspension in the tank, fully contacting with the wastewater. In the aerobic tank 6, above the aeration pipe 29, there is also a filler 28 for the habitat of microorganisms. When the water in it passes from bottom to top, the microorganisms will survive and reproduce on the surface of the filler, gradually form a biofilm, and absorb The organic pollutants in the sewage are used as nutrients and obtain energy during the metabolic process to form new microbial organisms. When the biofilm reaches a certain thickness, oxygen cannot penetrate into the biofilm, resulting in an anoxic state in the inner layer, making the biological At this time, under the impact of the water flow, the biofilm begins to fall off, and then a new biofilm will grow on the filler, and the cycle repeats. A reflux pump is provided at the lower part of the aerobic pool 6 to return the water in the aerobic pool 6 to the bottom of the filler 28 in the anoxic pool 5, and the formed reflux not only prevents sludge deposition, but also forms the process of nitrification and denitrification , to achieve the purpose of dephosphorization and nitrogen removal. An annular water distribution tank 30 is arranged on the outer wall of the aerobic tank 6, and a plurality of water distribution pipes 31 used in conjunction with the bottom of the cone of the sedimentation tank 7 are arranged in the annular water distribution tank 30.

The settling tank 7 has a vertical flow structure and is arranged in a ring, and its function is to separate the exfoliated biofilm from the aerobic tank 6 from solid to liquid. The bottom of the sedimentation tank 7 is divided into multiple independent cones, each cone corresponds to a water distribution pipe 31 , and the lower part is provided with a pipe 32 communicating with the sludge tank 10 . The annular water distribution tank 30 is respectively sent to the bottom of the cone of the sedimentation tank 7 through the water distribution pipe 31 to realize liquid-solid separation. The separated solid part enters the sludge tank 10 through the pipeline 32 under the effect of the static pressure of the water body, and the separated liquid part flows into the water storage tank 8, and the described water storage tank is located at the lower part of the sedimentation tank 7 periphery, and is connected with the sedimentation tank 7 There is a certain drop between the water outlets, so that the water flowing into the water storage tank flows into the landscape pool 35 in the form of a waterfall, which is highly ornamental. In order to ensure the stability of the water flow and make the water outlet uniform, an overflow weir 33 is provided at the water outlet of the sedimentation tank 7 . A filter layer is provided in the water storage tank 8 to filter the residual suspended matter, and a disinfection device 9 is provided at the outlet of the water storage tank 8, and ultraviolet disinfection equipment is used to kill pathogens, so that the discharged water meets the requirements of reclaimed water recycling.

When this embodiment is in use, the urban sewage enters the regulating tank and stays for more than 2 hours to complete the A-stage process of the biochemical reaction. In the reaction zone, the treated sewage is subjected to physical and chemical coagulation reaction, and at the same time, by setting an aeration tube in the first reaction zone, the sewage can obtain the physical and chemical coagulation reaction and the metabolism of biochemical microorganisms at the same time, and complete the physical and chemical process and biochemical process. The first recombination; the sewage overflowed from the upper end of the first reaction zone enters the second reaction zone set around the first reaction zone to form a hydraulic cycle so that the treated sewage can undergo physical and chemical coagulation reaction again, and at the same time pass through the second reaction zone The aeration tube is set so that the sewage can obtain the metabolism of biochemical microorganisms again while obtaining the physical and chemical coagulation reaction again, and complete the biochemical AO process together with the regulating tank. Part of the sewage treated in the second reaction zone flows back into the first reaction zone, and the other part of the sewage enters the inverted cone-shaped clarification zone from the lower part of the second reaction zone, and the suspended matter settles under the action of its own weight to the clarification zone. The mud collection hopper with the cone wall is discharged into the sludge tank through the pipeline under the static pressure of the water body, and the sewage completes the biochemical "A" stage process in the clarification tank. The clear water on the upper surface is collected by the water receiving tank and then sent to the bottom of the anoxic pool through the standpipe. The biochemical "A" stage process is completed in the anoxic pool. The biochemical "O" section process is completed in the oxygen pool, thereby completing the "AAO" process of the biochemical reaction. The sewage that enters the sedimentation tank from the aerobic tank completes solid-liquid separation in the sedimentation tank, the separated solid part is discharged into the sludge tank through the pipeline, and the liquid part flows into the storage tank through the overflow weir, and the ultraviolet disinfection equipment is used to kill pathogens, so that The discharged water meets the requirements for reclaimed water recycling. The sludge in the sludge tank is pumped into the circulating clarifier tank and the aerobic tank by the mud pump to complete the activated sludge reaction, and the remaining sludge is pumped into the sludge dehydrator through the mud pump for dehydration.

Claims (8)

1. A compound sewage treatment method, characterized in that: the process steps of the treatment method are: the treated sewage enters the lower regulating tank to stay for a certain period of time, and the sewage is subjected to anaerobic treatment, that is, the biochemical "A" section is completed Process: The sewage entering the inverted cone-shaped first reaction zone from the regulating tank is sprayed from bottom to top through the nozzle after being dosed before the pump, so that the treated sewage can undergo physical and chemical coagulation reaction, and at the same time, through the setting in the first reaction zone The aeration tube enables the sewage to obtain the metabolism of biochemical microorganisms while obtaining physical and chemical coagulation reactions, and completes the first compounding of physical and chemical processes and biochemical processes; the sewage overflowing from the upper end of the first reaction area enters the surrounding first reaction area. The hydraulic circulation is formed in the second reaction zone to make the treated sewage get physical and chemical coagulation reaction again, and at the same time, through the aeration tube set in the second reaction zone, the sewage can get the physical and chemical coagulation reaction again and the metabolism of biochemical microorganisms at the same time A part of the sewage treated in the second reaction zone flows back into the first reaction zone, and another part of the sewage enters the inverted cone-shaped clarification zone through the gap in the lower part of the second reaction zone, and the suspended matter settles under the action of its own weight to the clarifier set up in the clarification zone. The mud collecting hopper on the cone wall of the zone is discharged into the sludge tank under the static pressure of the water body. The clear water on the upper surface is collected by the water collecting tank and then sent to the bottom of the anoxic tank through the standpipe. The first reaction zone and the second reaction zone The circulating clarification tank composed of the zone and the clarification zone is located at the upper part, forming a high water head; the anoxic tank is located below the circulating clarification tank, and there is a filler in it, and the anoxic treatment is performed on the treated sewage entering it, that is, the biochemical " A" section process; the treated sewage from the anoxic pool flows into the aerobic pool through the aeration tube set in it to make the sewage get the metabolism of biochemical microorganisms, and complete the biochemical "O" section process, the water part in the aerobic pool Return to the anoxic tank to form nitrification and denitrification, and complete the process of dephosphorization and nitrogen removal; the treated sewage flowing into the sedimentation tank from the aerobic tank is separated from solid and liquid, and the separated solid part is discharged from the bottom under the static pressure of the water body. In the sludge tank, the separated liquid part flows into the water storage tank from the upper part, and is reused after being sterilized by the disinfection equipment; the sludge part in the sludge tank is returned to the circulating clarifier tank and the aerobic tank to realize the activated sludge reaction, and the remaining part is produced by The dehydration equipment removes the moisture and is shipped out. 2. A device for implementing the composite sewage treatment method as claimed in claim 1, characterized in that: the adjustment tank (1) for anaerobic treatment of sewage is located at the lower part of the device, so that the physical and chemical processes and biochemical processes are compounded for circular clarification The tank (4) is located on the upper part of the device, and the circulating clarifier (4) is an inverted conical structure, and the cone (14) is sequentially provided with a nozzle (15), a mixing cover (16), a throat (17 ) and expansion tube (18), the first reaction zone (20) is in the expansion tube, and the second reaction zone (21) is between the guide body (19) and the expansion tube that are arranged around the outer upper part of the expansion tube, and in the first reaction zone Aeration pipes (29) are all arranged in the second reaction zone and the inner wall of the diversion body, the expansion pipe and the cone is a clarification zone (22). The mud collection bucket (23) communicates with the sludge tank (10) through the mud discharge pipe (27), and a plurality of water collection tanks (25) connected with the annular water collection tank (26) are evenly arranged on the upper end of the clarification area. A standpipe (24) communicating with the anoxic tank (5) is arranged in the sump (26); a booster pump (3) and a dosing lower feeder (2), the inlet of the pressurized pump is located in the regulating tank, the outlet is located in the circulating clarifier, and the feeding port of the feeding machine is located at the inlet of the pressurized pump; a sludge tank (10 ), the outlets of which are connected to the circulating clarifier, the aerobic tank and the sludge dehydrator respectively; the anoxic tank (5) is located at the bottom of the circulating clarifier, and fillers (28) are arranged in it; the aerobic tank (6) is arranged on Next to the anoxic tank, it is connected with the anoxic tank through a pipeline, and a filler (28) and an aeration pipe (29) are arranged inside, and an annular water distribution tank (30) is arranged on the outer wall of the aerobic tank, and a plurality of Water distribution pipes (31), the plurality of water distribution pipes correspond to the bottom of the cone of the sedimentation tank respectively; a sedimentation tank (7) is arranged around the aerobic tank, and the bottom of the sedimentation tank is divided into a plurality of independent cones, The lower part of each cone is provided with a pipeline (32) communicating with the sludge tank, a water storage tank (8) is arranged at the lower peripheral part of the sedimentation tank, and a disinfection device (9) is arranged at the outlet of the water storage tank. 3. The composite sewage treatment device according to claim 2, characterized in that: the sedimentation tank (7) is a vertical flow structure. 4. The composite sewage treatment device according to claim 2, characterized in that: the outlet at the lower end of the riser (24) is at an included angle. 5. The composite sewage treatment device according to claim 2, characterized in that: an overflow weir (33) is provided at the water outlet of the sedimentation tank (7). 6. The composite sewage treatment device according to claim 2, characterized in that: a filter layer is arranged in the water storage tank (8). 7. The composite sewage treatment device according to claim 2, characterized in that: the water receiving tank (25) is arranged in a radial network. 8. The composite sewage treatment device according to claim 2 or 7, characterized in that: the water receiving tank (25) is a zigzag dovetail structure.

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