Domestic sewage treatment system suitable for AOA coupled anaerobic ammonia oxidation process

Abstract

The utility model belongs to sewage treatment device, especially point to a kind of domestic sewage treatment system suitable for AOA coupling anaerobic ammonia oxidation process. Including the pretreatment unit, core reaction unit, solid-liquid separation unit and auxiliary unit connected in proper order;Core reaction unit anaerobic tank, aerobic tank, anoxic tank head-to-tail connection, anaerobic tank pool wall top is communicated with aerobic tank by outlet pipe, anaerobic tank bottom is equipped with the perforated aerator with nitrogen as gas source, perforated aerator top is equipped with screen, anaerobic tank content has the polyurethane sponge ball filling for enriching anaerobic ammonia oxidation bacteria, guide vane is distributed in the anaerobic tank inner cavity above screen along longitudinal direction and is set along transverse direction interval, aerobic tank and anoxic tank are equipped with the combined filling for hanging microbial membrane.Besides the utility model effectively solves the problems of large aeration quantity, high energy consumption and organic carbon source consumption in the prior art, and has the advantages of small aeration quantity, low energy consumption and organic carbon source consumption, and is beneficial to environmental protection.

Description

Technical Field

[0001] This utility model pertains to wastewater treatment devices, and specifically refers to a domestic wastewater treatment system suitable for AOA coupled anaerobic ammonia oxidation process. Background Technology

[0002] Traditional AOA (anaerobic-anoxic-aerobic) equipment is a complete biological treatment system, not a single tank. It is a continuous treatment process consisting of a "pretreatment unit + core reaction unit + solid-liquid separation unit + auxiliary unit". Each working unit works together to achieve the goals of degrading organic matter, removing nitrogen and phosphorus in wastewater. The structural design of the core reaction unit and the solid-liquid separation unit directly determines the treatment effect.

[0003] Traditional AOA equipment operates according to the wastewater treatment process, with the following steps: The pretreatment unit provides stable influent to the core reaction unit; the core reaction unit is the central site for organic matter degradation, nitrogen and phosphorus removal, where the anaerobic tank creates an anaerobic environment for phosphorus release by polyphosphate-accumulating bacteria, the anoxic tank achieves nitrogen removal through denitrification, and the aerobic tank completes nitrification and deep degradation of organic matter; the solid-liquid separation unit separates sludge from the treated water in the mixed liquor, with some sludge returned to the anaerobic and anoxic tanks and some discharged, and the treated water either meeting discharge standards or undergoing further treatment; the auxiliary units, including sludge return devices (return pumps, pipelines), aeration devices (blowers, aerators), chemical dosing devices (pH adjustment, sludge conditioning agents), and monitoring and control devices (online instruments, PLC control cabinets), ensure stable operation of the entire process.

[0004] The above-mentioned treatments are suitable for domestic sewage with low C / N ratios and have the advantages of low sludge production, no need for external carbon sources, and deep denitrification. However, they also have the following disadvantages: First, the aerobic tank undergoes full nitrification, requiring a large aeration volume and numerous aeration devices, resulting in high energy consumption. Second, the anoxic tank undergoes full denitrification, and most of the denitrifying bacteria are heterotrophic, which consume a large amount of organic carbon sources. The anoxic tank also produces the powerful greenhouse gas N2O, which damages the ecological environment. Summary of the Invention

[0005] The purpose of this invention is to provide a domestic wastewater treatment system suitable for AOA coupled anaerobic ammonia oxidation process. By setting polyurethane sponge ball packing material carrying anaerobic ammonia oxidizing bacteria in the anaerobic tank, and setting baffles and perforated aerators, the system facilitates the cultivation of anaerobic ammonia oxidizing bacteria. Short-cut nitrification and short-cut denitrification reactions occur in the aerobic and anoxic tanks, thereby reducing the generation of greenhouse gas N2O and lowering carbon source consumption and energy consumption.

[0006] The overall technical concept of this utility model is:

[0007] A domestic wastewater treatment system suitable for AOA coupled anaerobic ammonia oxidation process includes a pretreatment unit, a core reaction unit, a solid-liquid separation unit, and auxiliary units connected in sequence. The pretreatment unit provides influent to the core reaction unit, which includes an anaerobic tank, an aerobic tank, and an anoxic tank. The solid phase of the solid-liquid separation unit has two outputs: one is discharged externally, and the other is discharged to the core reaction unit. The liquid phase of the solid-liquid separation unit is discharged externally after passing the test. The auxiliary unit includes a sludge return device, an aeration device, and a monitoring device to ensure stable system operation. The anaerobic tank, aerobic tank, and anoxic tank are connected end to end. The anaerobic tank is connected to the aerobic tank through an outlet pipe. The bottom of the anaerobic tank is equipped with a perforated aerator using nitrogen as the gas source. A screen is installed above the perforated aerator. The anaerobic tank contains polyurethane sponge ball packing for enriching anaerobic ammonia oxidizing bacteria. Baffles are distributed longitudinally and spaced laterally in the anaerobic tank cavity above the screen. The aerobic tank and anoxic tank are equipped with combined packing for mounting microbial films.

[0008] Anaerobic ammonium oxidizing bacteria, also known as red bacteria, are autotrophic bacteria. These microorganisms are commercially available. Anaerobic ammonium oxidizing bacteria (AnAOB) typically oxidize ammonia to N2 using nitrite as an electron acceptor under aerobic or anoxic conditions. Enrichment cultivation of anaerobic ammonium oxidizing bacteria requires an anaerobic environment. Therefore, anaerobic ammonium oxidizing bacteria are cultivated in an anaerobic tank, while endogenous denitrifying bacteria undergo carbon fixation, and polyphosphate-accumulating bacteria release phosphorus. By controlling the system's operating conditions, short-cut nitrification coupled with anaerobic ammonium oxidation occurs in the aerobic tank. Under the action of anaerobic ammonium oxidizing bacteria, ammonia nitrogen reacts with the generated nitrite to produce N2, achieving the removal of total nitrogen and ammonia nitrogen. In the anoxic tank, short-cut denitrification coupled with anaerobic ammonium oxidation produces nitrite. Simultaneously, under the action of denitrifying bacteria, endogenous denitrification occurs, and nitrite reacts with ammonia nitrogen to produce N2, achieving the removal of total nitrogen and ammonia nitrogen.

[0009] The function of the perforated tube aerator in the anaerobic tank is to agitate the gas, so that the polyurethane sponge ball packing is in a fluidized state. Using nitrogen as the gas source can prevent it from reacting with the water and create an anaerobic culture environment for anaerobic ammonia oxidizing bacteria. The screen is used to prevent the polyurethane sponge ball packing from falling to the bottom of the tank and to ensure that the polyurethane sponge ball packing is in a suspended state. The applicant has proven through experiments that it can effectively shorten the culture cycle of anaerobic ammonia oxidizing bacteria.

[0010] The specific technical concept of this utility model also includes:

[0011] The function of the effluent pipe is to facilitate the flow of materials between the anaerobic tank and the aerobic tank. To avoid cross-tank flow of polyurethane sponge ball packing and combined packing, the preferred technical means is that the material input end of the effluent pipe is a blind end, and an opening is provided on the effluent pipe for material to pass through.

[0012] The main function of the flow guide plate is to create flow channels for the polyurethane sponge ball packing to facilitate the cultivation of anaerobic ammonia-oxidizing bacteria. The preferred technical means is that the flow guide plate includes a first flow guide plate arranged longitudinally and spaced apart on the left and right sides in the anaerobic tank, and a second flow guide plate arranged between the first flow guide plates and having an arc-shaped structure on the upper part. The above structure enables the polyurethane sponge ball packing to circulate around the first flow guide plate and the second flow guide plate under the agitation of gas.

[0013] The bottom of the aerobic tank is equipped with a disc-type microporous aerator. A rotary blower is connected to the disc-type microporous aerator through a vortex flow meter and a second aeration pipeline. The first combination of packing material for mounting the microbial film is set above the disc-type microporous aerator. The first combination of packing material is arranged longitudinally and distributed laterally at intervals.

[0014] It also includes a sludge concentration meter for detecting the concentration of suspended solids in the aerobic tank and a dissolved oxygen meter for detecting the concentration of dissolved oxygen in the aerobic tank.

[0015] A rotary blower aerates the water in the tank through a second aeration pipe and a disc-type microporous aerator, ensuring the short-cut nitrification coupled with anaerobic ammonium oxidation. Simultaneously, nitrification and aerobic phosphorus uptake occur in the aerobic tank. To meet the dissolved oxygen concentration requirements of anaerobic ammonium oxidizing bacteria, a more preferred technical approach is to adjust the output airflow of the rotary blower in the aerobic tank to control the dissolved oxygen concentration at 1.5–2.0 mg / L, and the dissolved oxygen concentration in the anoxic tank at 0.3–0.5 mg / L.

[0016] The material output from the aerobic tank is connected to the anoxic tank through the first water passage below its side wall.

[0017] The anoxic tank is equipped with a mixer and a second set of packing materials for mounting microbial films.

[0018] The material output from the anoxic tank is connected to the sedimentation tank through a second water passage above its side wall.

[0019] The structural design of the outlet pipe, the first water passage hole, and the second water passage hole allows the material to flow in an "S" shape between the various tanks. This effectively extends the travel time and reaction time of the wastewater within the tank, thereby improving the treatment effect.

[0020] The solid-liquid separation unit includes a sedimentation tank. The sludge from the bottom of the sedimentation tank is discharged to the core reaction unit via two routes. The first route is transported to the material input end of the anaerobic tank via a first sludge return pump and a first electromagnetic flowmeter. The second route is transported to the material input end of the anoxic tank via a second sludge return pump and a second electromagnetic flowmeter. To achieve effective control of sludge return, the preferred technical implementation is that the first return ratio is 100%, and the second return ratio is 200%.

[0021] The nitrogen generator is connected to the perforated aerator via the first aeration pipeline. The water inlet of the pretreatment unit is connected to the material inlet of the anaerobic tank via the water inlet diaphragm pump, the water inlet electromagnetic flow meter, and the sewage inlet pipe.

[0022] It also includes an electrical control cabinet that can effectively control the inlet diaphragm pump, nitrogen generator, rotary blower, mixer, first sludge return pump, and second sludge return pump. Since this is prior art, the applicant will not elaborate on its structure here.

[0023] The applicant needs to explain that:

[0024] In the description of this utility model, the terms "input," "output," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the purpose of simplifying the description of this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. The terms "first" and "second" are used only to indicate distinction and should not be construed as implying importance.

[0025] The technological advancements achieved by this utility model are as follows:

[0026] 1. This invention couples anaerobic ammonia oxidation (AA) technology into traditional AOA equipment. Anaerobic ammonia oxidizing bacteria are cultivated in the anaerobic tank, while short-cut nitrification and short-cut denitrification reactions are completed in the aerobic and anoxic tanks. Firstly, this effectively reduces the aeration volume in the aerobic tank and lowers energy consumption. Secondly, the anaerobic ammonia oxidizing bacteria are autotrophic, and the denitrification process does not require an organic carbon source. Thirdly, the short-cut denitrification reaction is completed in the anoxic tank, resulting in low organic carbon source consumption. Fourthly, the sludge production is low and does not generate the strong greenhouse gas N2O, thus protecting the ecological environment.

[0027] 2. Using polyurethane sponge ball packing as a carrier for anaerobic ammonia oxidizing bacteria can effectively enrich anaerobic ammonia oxidizing bacteria and prevent their loss.

[0028] 3. The perforated tube aerator using nitrogen as the gas source, along with the auxiliary screen and guide plate, serves several purposes: first, it provides an anaerobic culture environment for anaerobic ammonia oxidizing bacteria; second, it ensures that the polyurethane sponge ball packing is in a suspended state and that the guide plate creates a circulation channel, facilitating the circulation movement of the polyurethane sponge ball packing to meet the needs of anaerobic ammonia oxidizing bacteria cultivation; and third, it effectively meets the anaerobic environment requirements during the cultivation of anaerobic ammonia oxidizing bacteria, shortening the cultivation cycle.

[0029] 4. The structure design using a rotary blower and dissolved oxygen meter can effectively meet the dissolved oxygen requirements of anaerobic ammonia oxidizing bacteria, which is conducive to the smooth progress of short-cut nitrification and short-cut denitrification reactions in aerobic and anoxic tanks.

[0030] 5. The first and second combination packing materials in the aerobic and anoxic tanks serve two purposes: firstly, to facilitate the setting and installation of the packing materials, and secondly, to facilitate the attachment of microbial films. Attached Figure Description

[0031] The accompanying drawings of this utility model are as follows:

[0032] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0033] Figure 2 yes Figure 1 Top view.

[0034] Figure 3 This is a schematic diagram showing the connection between the effluent pipe and the anaerobic and aerobic tanks.

[0035] Figure 4 yes Figure 3 View B.

[0036] Figure 5 This is a schematic diagram of the distribution structure of the first and second water passages.

[0037] The reference numerals in the attached figures are as follows:

[0038] 1. Inlet diaphragm pump; 2. Sewage inlet pipe; 3. Polyurethane sponge ball packing; 4. Baffle plate; 4A. First baffle plate; 4B. Second baffle plate; 5. Screen; 6. Perforated pipe aerator; 7. Nitrogen generator; 8. Outlet pipe; 8A. Opening; 9. Inlet electromagnetic flow meter; 10. First aeration pipeline; 11. Rotary blower; 12. Vortex flow meter; 13. Second aeration pipeline; 14. Disc microporous 15. Aerator; 16. Sludge concentration meter; 17. Dissolved oxygen meter; 18. Electrical control cabinet; 19. Mixer; 20. Second sludge return pump; 21. Second electromagnetic flow meter; 22. Second sludge return pipeline; 23. First sludge return pump; 24. First electromagnetic flow meter; 25. First sludge return pipeline; 26. First combined packing; 27. Second combined packing; 28. First water passage hole; 29. ​​Second water passage hole. Detailed Implementation

[0039] The present invention will be further described below with reference to the embodiments, but it should not be construed as a limitation of the present invention. The protection scope of the present invention shall be determined by the contents of the claims. Any equivalent technical means substitution made in accordance with the specification shall not depart from the protection scope of the present invention.

[0040] Example

[0041] The overall structure of this embodiment is shown in the figure. It is suitable for a domestic wastewater treatment system using an AOA coupled anaerobic ammonia oxidation process. It includes a pretreatment unit, a core reaction unit, a solid-liquid separation unit, and an auxiliary unit connected in sequence. The pretreatment unit provides influent to the core reaction unit. The core reaction unit includes an anaerobic tank, an aerobic tank, and an anoxic tank. The solid phase of the solid-liquid separation unit has two outputs: one is discharged externally, and the other is discharged to the core reaction unit. The liquid phase of the solid-liquid separation unit is discharged externally after passing the test. The auxiliary unit includes a sludge return device, an aeration device, and a monitoring device to ensure the stable operation of the system. The anaerobic tank, aerobic tank, and anoxic tank are connected end to end. The top of the anaerobic tank wall is connected to the aerobic tank through an outlet pipe 8. The bottom of the anaerobic tank is equipped with a perforated aerator 6 using nitrogen as the gas source. A screen 5 is installed above the perforated aerator 6. The anaerobic tank contains polyurethane sponge ball packing 3 for enriching anaerobic ammonia oxidizing bacteria. The anaerobic ammonia oxidizing bacteria are solidified carrier microorganisms produced by Fujian Bayer Biotechnology Co., Ltd. The guide plates 4 are distributed longitudinally and spaced laterally in the anaerobic tank cavity above the screen 5. The aerobic tank and the anoxic tank are equipped with combined packing materials for mounting microbial films.

[0042] The material input end of the water outlet pipe 8 is a blind end, and the water outlet pipe 8 is provided with an opening 8A for material to pass through.

[0043] The guide plate 4 includes a first guide plate 4A arranged longitudinally and spaced apart on the left and right sides in the anaerobic tank, and a second guide plate 4B arranged between the first guide plates 4A and having an arc-shaped upper part.

[0044] The bottom of the aerobic tank is equipped with a disc microporous aerator 14. The rotary blower 11 is connected to the disc microporous aerator 14 through the vortex flow meter 12 and the aeration pipeline 13. The first combination packing 25 for mounting the microbial film is set above the disc microporous aerator 14. The first combination packing 25 is arranged longitudinally and distributed laterally at intervals.

[0045] It also includes a sludge concentration meter 15 for detecting the concentration of suspended solids in the aerobic tank and a dissolved oxygen meter 16 for detecting the concentration of dissolved oxygen in the aerobic tank.

[0046] Rotary blower 11 aerates the water in the tank through the second aeration pipe 13 and disc microporous aerator 14, ensuring the realization of the short-cut nitrification coupled with anaerobic ammonium oxidation process. Simultaneously, nitrification and aerobic phosphorus uptake occur in the aerobic tank. By adjusting the output air volume of rotary blower 11 in the aerobic tank, the dissolved oxygen concentration in the aerobic tank is controlled at 1.5–2.0 mg / L, and the dissolved oxygen concentration in the anoxic tank is controlled at 0.3–0.5 mg / L.

[0047] The material output from the aerobic tank is connected to the anoxic tank through the first water passage 27 at the bottom of its side wall.

[0048] The anoxic tank is equipped with a mixer 18 and a second combination packing material 26 for mounting microbial films.

[0049] The material output from the anoxic tank is connected to the sedimentation tank through the second water passage 28 on the upper side wall.

[0050] The structural design of the outlet pipe 8, the first water passage hole 27, and the second water passage hole 28 allows the material to flow in an "S" shape between the various tanks, which can effectively extend the travel time and reaction time of the sewage in the tank, thereby improving the treatment effect.

[0051] The solid-liquid separation unit includes a sedimentation tank. The sludge from the bottom of the sedimentation tank is discharged to the core reaction unit via two routes. The first route is transported to the material input end of the anaerobic tank via a first sludge return pump 22, a first electromagnetic flowmeter 23, and a first sludge return pipeline 24. The second route is transported to the material input end of the anoxic tank via a second sludge return pump 19, a second electromagnetic flowmeter 20, and a second sludge return pipeline 21. The return ratio of the first route is 100%, and the return ratio of the second route is 200%.

[0052] The nitrogen generator 7 is connected to the perforated aerator 6 via the aeration pipeline 10. The water inlet of the pretreatment unit is connected to the material inlet of the anaerobic tank via the water inlet diaphragm pump 1, the water inlet electromagnetic flow meter 9, and the sewage inlet pipe 2.

[0053] It also includes an electrical control cabinet 17, which can be used to effectively control the inlet diaphragm pump, nitrogen generator, rotary blower, mixer, first sludge return pump, and second sludge return pump.

[0054] The working principle of this embodiment is as follows:

[0055] Domestic sewage is pumped into the material input end at the bottom of the anaerobic tank via inlet diaphragm pump 1, inlet electromagnetic flowmeter 9, and sewage inlet pipe 2. Simultaneously, a portion of activated sludge from the sedimentation tank is added to the material input end at the bottom of the anaerobic tank via first sludge return pump 22, first electromagnetic flowmeter 23, and first sludge return pipe 24. Under the agitation of the perforated pipe aerator 6, the activated sludge and sewage in the tank are thoroughly mixed. Meanwhile, the polyurethane sponge ball packing 3, enriched with anaerobic ammonia oxidizing bacteria, circulates along the first guide plate 4A and the second guide plate 4B. The sewage enters the aerobic tank via outlet pipe 8. In the anaerobic tank, the enrichment and cultivation of anaerobic ammonia oxidizing bacteria mainly takes place, while endogenous denitrifying bacteria undergo carbon fixation, and polyphosphate-accumulating bacteria release phosphorus.

[0056] Wastewater enters the aerobic tank, which is equipped with the first set of packing materials 25. Disc-type microporous aerators 14 are connected to rotary blowers 11 through aeration pipes 13 to oxygenate the water in the tank, ensuring the realization of the short-cut nitrification coupled with anaerobic ammonium oxidation process. At the same time, nitrification and aerobic phosphorus uptake reactions take place in the aerobic tank.

[0057] Wastewater enters the anoxic tank after passing through the aerobic tank. Part of the activated sludge from the sedimentation tank is transported to the material input end of the anoxic tank via the second sludge return pump 19, the second electromagnetic flow meter 20, and the second sludge return pipeline 21. The tank is equipped with anoxic zone combined packing material 26 and a mixer 18, which causes short-range denitrification coupled with anaerobic ammonia oxidation reaction. At the same time, denitrifying bacteria use internal carbon sources to carry out denitrification nitrogen removal and denitrification phosphorus removal.

[0058] The effluent from the anoxic tank enters the sedimentation tank, where sludge and water are separated. Part of the sludge formed is returned to the anaerobic tank and the anoxic tank via the first sludge return pump 22 and the second sludge return pump 19, respectively, while the remainder is discharged as surplus sludge.

[0059] The wastewater within the system flows in an "S" shape between the various tanks, and the positions of the water passages between the tanks are as follows: Figure 5 As shown.

Claims

1. A domestic wastewater treatment system suitable for AOA coupled anaerobic ammonia oxidation process, comprising a pretreatment unit, a core reaction unit, a solid-liquid separation unit, and auxiliary units connected in sequence; the pretreatment unit provides influent to the core reaction unit, which includes an anaerobic tank, an aerobic tank, and an anoxic tank; the solid phase of the solid-liquid separation unit has two outputs, one for external discharge and the other for discharge to the core reaction unit; the liquid phase of the solid-liquid separation unit is discharged after passing testing; the auxiliary units include a sludge return device, an aeration device, and a monitoring device to ensure stable system operation; characterized in that... The anaerobic tank, aerobic tank, and anoxic tank are connected end to end. The anaerobic tank is connected to the aerobic tank through an outlet pipe (8) at the top of its wall. The bottom of the anaerobic tank is equipped with a perforated aerator (6) that uses nitrogen as a gas source. A screen (5) is installed above the perforated aerator (6). The anaerobic tank contains polyurethane sponge ball packing (3) for enriching anaerobic ammonia oxidizing bacteria. The guide plate (4) is distributed longitudinally and spaced laterally in the anaerobic tank cavity above the screen (5). The aerobic tank and the anoxic tank are equipped with combined packing for mounting microbial films.

2. The domestic wastewater treatment system suitable for AOA coupled anaerobic ammonium oxidation process according to claim 1, characterized in that... The material input end of the water outlet pipe (8) is a blind end, and an opening (8A) for material to pass through is provided on the water outlet pipe (8).

3. The domestic wastewater treatment system suitable for AOA coupled anaerobic ammonium oxidation process according to claim 1, characterized in that... The guide plate (4) includes a first guide plate (4A) arranged longitudinally and spaced apart in the anaerobic tank, and a second guide plate (4B) arranged between the first guide plates (4A) and having an arc-shaped upper part.

4. The domestic wastewater treatment system suitable for AOA coupled anaerobic ammonium oxidation process according to claim 1, characterized in that... The bottom of the aerobic tank is equipped with a disc microporous aerator (14). A rotary blower (11) is connected to the disc microporous aerator (14) through a vortex flow meter (12) and a second aeration pipeline (13). The first combined packing material (25) for mounting the microbial film is set above the disc microporous aerator (14). The first combined packing material (25) is arranged longitudinally and distributed laterally at intervals.

5. The domestic wastewater treatment system suitable for AOA coupled anaerobic ammonium oxidation process according to claim 4, characterized in that... It also includes a sludge concentration meter (15) for detecting the concentration of suspended solids in the aerobic tank and a dissolved oxygen meter (16) for detecting the concentration of dissolved oxygen in the aerobic tank.

6. The domestic wastewater treatment system suitable for AOA coupled anaerobic ammonium oxidation process according to claim 1, 4 or 5, characterized in that... The material output from the aerobic tank is connected to the anoxic tank through the first water passage (27) below its side wall.

7. The domestic wastewater treatment system suitable for AOA coupled anaerobic ammonium oxidation process according to claim 1, characterized in that... The anoxic tank is equipped with a mixer (18) and a second combination packing material (26) for mounting microbial films.

8. The domestic wastewater treatment system suitable for AOA coupled anaerobic ammonium oxidation process according to claim 1 or 7, characterized in that... The material output from the anoxic tank is connected to the sedimentation tank through the second water passage (28) above its side wall.

9. The domestic wastewater treatment system suitable for AOA coupled anaerobic ammonium oxidation process according to claim 1, characterized in that... The solid-liquid separation unit includes a sedimentation tank. The sludge at the bottom of the sedimentation tank is output to the core reaction unit in two ways. The first way is transported to the material input end of the anaerobic tank via the first sludge return pump (22) and the first electromagnetic flow meter (23). The second way is transported to the material input end of the anoxic tank via the second sludge return pump (19) and the second electromagnetic flow meter (20).

10. The domestic wastewater treatment system suitable for AOA coupled anaerobic ammonium oxidation process according to claim 1 or 9, characterized in that... The nitrogen generator (7) is connected to the perforated aerator (6) via the first aeration pipeline (10). The water inlet of the pretreatment unit is connected to the material inlet of the anaerobic tank via the water inlet diaphragm pump (1), the water inlet electromagnetic flow meter (9), and the sewage inlet pipe (2).

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