MABR-MBBR-CW coupled sewage treatment system

Abstract

The utility model relates to the technical field of sewage treatment, and discloses an MABR-MBBR-CW coupled sewage treatment system which comprises a pretreatment module, a biological membrane treatment module, a composite ecological floating bed module and an automatic control system which are communicated in sequence, the biological membrane treatment module comprises an MABR treatment unit and an MBBR treatment unit which are arranged from bottom to top, and the MABR treatment unit is communicated with the pretreatment module; the MBBR treatment unit comprises a transition cavity and an aerobic cavity which are arranged in parallel and communicated with each other, the MABR treatment unit is communicated with the transition cavity, and a first filler area and a gel layer are arranged in the aerobic cavity from bottom to top; the composite ecological floating bed module comprises a CW treatment unit, and the CW treatment unit is located at the top of the aerobic cavity and communicated with the aerobic cavity. The process flow is simple, the retention time is remarkably shortened, the volume load of the system is improved, the occupied area is reduced, the treatment efficiency is stable, and the integration degree is high.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a MABR-MBBR-CW coupled sewage treatment system. Background Technique

[0002] If a large amount of livestock and poultry manure produced by the livestock and poultry breeding industry is directly discharged without treatment, it is easy to cause the decline of the surrounding water environment quality and affect the water body function. There are sewage treatment stations for large-scale livestock and poultry manure, but there is a lack of effective treatment processes for decentralized livestock and poultry manure.

[0003] To effectively solve the problem of decentralized livestock and poultry manure treatment, most regions currently adopt the traditional black film method, which has low investment costs and can remove a certain amount of organic matter in livestock and poultry manure. However, it has a long residence time, a large floor area, and the effluent COD is still relatively high. The removal of SS, nitrogen, and phosphorus in livestock and poultry manure is limited, and direct field application is likely to cause soil compaction and a decrease in crop yields. In addition, high-efficiency anaerobic bioreactors such as upflow sludge bed reactors (UASB), anaerobic filters (AF), and anaerobic expanded granular sludge beds (EGSB) have a high removal rate of organic matter, but they have a complex structure and a low removal rate of nitrogen and phosphorus.

[0004] Therefore, how to provide a sewage treatment system with a simple structure, a small floor area, a short hydraulic retention time, and high treatment efficiency is an urgent problem to be solved by those skilled in the art. Content of the Utility Model

[0005] In view of this, the utility model provides a MABR-MBBR-CW coupled sewage treatment system to solve the problems of large floor area, complex structure, long hydraulic retention time, and inability to effectively remove organic matter, nitrogen, phosphorus, etc. while reducing COD in the existing decentralized livestock and poultry manure treatment.

[0006] To solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A MABR-MBBR-CW coupled sewage treatment system includes a pretreatment module, a biofilm treatment module, a composite ecological floating bed module, and an automatic control system that are connected in sequence;

[0008] The biofilm treatment module includes a MABR treatment unit and an MBBR treatment unit arranged from bottom to top. The MABR treatment unit is connected to the pretreatment module through an inlet at the bottom; the MBBR treatment unit includes a transition cavity and an aerobic cavity arranged in parallel and connected. The MABR treatment unit is connected to the transition cavity through an outlet at the top. A first packing area and a gel layer are arranged from bottom to top in the aerobic cavity;

[0009] The composite ecological floating bed module includes a CW treatment unit, and the CW treatment unit is located at the top of the aerobic cavity and communicates with the aerobic cavity.

[0010] Preferably, along the fluid flow direction, the MABR treatment unit includes an anoxic zone, an anaerobic zone, and an aerobic zone separated by two first baffle plates, and the anoxic zone, the anaerobic zone, and the aerobic zone are arranged in parallel.

[0011] Preferably, the anoxic zone communicates with the pretreatment module through the water inlet, and a sepiolite-modified composite filler is provided in the anoxic zone with a filling rate of 40-60%; modified zero-valent iron zeolite composite fillers are provided in both the anaerobic zone and the aerobic zone with a filling rate of 30-50%; and the aerobic zone communicates with the transition cavity through the water outlet at the top.

[0012] Preferably, the transition cavity and the aerobic cavity are separated by a second baffle plate, a mud guide plate is provided at the bottom of the aerobic cavity, an aeration system connected to the automatic control system is provided at one end near the top inside the mud guide plate, and the first filler zone is located at the top of the aeration system.

[0013] Preferably, a sludge return pipe is connected to the bottom of the aerobic cavity, the sludge return pipe communicates with the anoxic zone, and a solenoid valve connected to the automatic control system is provided on the sludge return pipe.

[0014] Preferably, a dissolved oxygen meter is provided inside the aerobic cavity.

[0015] Preferably, a diversion layer is further provided inside the aerobic cavity, and the diversion layer is located at the top of the gel layer.

[0016] Preferably, the diversion layer is connected with a nitrification liquid return pipe, the nitrification liquid return pipe communicates with the anoxic zone, and a solenoid valve connected to the automatic control system is provided on the nitrification liquid return pipe.

[0017] Preferably, the CW treatment unit includes a second filler zone and a floating bed zone arranged from bottom to top; the second filler zone communicates with the aerobic cavity through a screen plate, and a modified ethylene-propylene copolymer filler is provided in the second filler zone; aquatic plants are provided in the floating bed zone, a water outlet pipe is connected to the side wall of the floating bed zone, and an on-line monitor is installed on the water outlet pipe.

[0018] Preferably, a modified activated carbon polyurethane composite filler is provided in the first filler zone with a filling rate of 30-55%.

[0019] Preferably, pneumatic stirring devices and ORP monitors connected to the automatic control system are provided in both the anoxic zone, the anaerobic zone, and the aerobic zone.

[0020] Preferably, a filter screen plate is provided at the water outlet at the top of the anoxic zone.

[0021] Preferably, the pretreatment module includes a water inlet pipe, a grille, and a solid-liquid separator that are connected in sequence, and the solid-liquid separator is connected to the water inlet of the MABR treatment unit.

[0022] The utility model provides a MABR-MBBR-CW coupled sewage treatment system. Compared with the prior art, its beneficial effects are as follows:

[0023] The process flow of the MABR-MBBR-CW coupled sewage treatment system of the utility model is simple, integrating the functions of MABR, MBBR, and CW processes. The MABR treatment unit converts the organic matter in the fecal sewage into biogas and denitrifies and removes nitrogen. The biogas slurry is intensively nitrified by the MBBR treatment unit, and then the CW treatment unit realizes the in-depth treatment and utilization of nitrogen and phosphorus.

[0024] The gel layer of the MBBR treatment unit can intercept the fillers in the first filler area while strengthening the removal of organic matter, prevent the loss of fillers, shorten the hydraulic retention time, increase the volumetric load, and reduce the investment and operation and maintenance costs. Moreover, the MABR, MBBR, and CW treatment units of the utility model are arranged vertically, effectively reducing the floor area. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0026] Figure 1 It is a schematic structural diagram of the MABR-MBBR-CW coupled sewage treatment system of the utility model.

[0027] In the figure:

[0028] 100 - Pretreatment module, 101 - Inlet pipe, 102 - Grille, 103 - Solid - liquid separator, 1031 - Screen, 1032 - Auger, 1033 - Screw shaft, 200 - Biofilm treatment module, 300 - MABR treatment unit, 301 - Inlet, 302 - First baffle, 303 - Facultative oxygen zone, 304 - Anaerobic zone, 305 - Anoxic zone, 306 - Sepiolite - modified composite filler, 307 - Modified zero - valent iron zeolite composite filler, 400 - MBBR treatment unit, 401 - Transition cavity, 402 - Aerobic cavity, 403 - Second baffle, 404 - Filter mesh plate, 405 - Mud guide plate, 406 - Microporous aeration pipe, 407 - First packing zone, 408 - Gel layer, 409 - Sludge return pipe, 410 - Sludge return solenoid valve, 411 - Diversion layer, 412 - Nitrification liquid return pipe, 413 - Nitrification liquid return solenoid valve, 500 - CW treatment unit, 501 - Second packing zone, 511 - Modified ethylene - propylene copolymer filler, 502 - Floating bed zone, 521 - Planting basket, 522 - Aquatic plants, 503 - Outlet trough, 504 - Screen plate, 600 - Outlet pipe, 700 - Composite ecological floating bed module, 800 - Automatic control system, 801 - First control system, 802 - Second control system, 803 - Third control system, 804 - Fourth control system. Detailed implementation manners

[0029] The following combines the drawings and embodiments to further describe in detail the detailed implementation manners of the present utility model. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0030] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present application.

[0031] The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0032] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0033] As Figure 1 shown, the embodiment of the present utility model provides a MABR-MBBR-CW coupled sewage treatment system. According to the flow direction of fecal sewage treatment, it includes a pretreatment module 100, a biofilm treatment module 200, and a composite ecological floating bed module 700 that are connected in sequence. Among them, the biofilm treatment module 200 and the composite ecological floating bed module 700 are vertically arranged and connected, which can effectively reduce the floor area.

[0034] In some embodiments of the present utility model, the pretreatment module 100 includes a water inlet pipe 101, a grille 102, and a solid-liquid separator 103 that are connected in sequence. Among them, the grille 102 is used to remove larger solid impurities in the sewage, and the solid-liquid separator 103 is used to remove crude fiber organic matter in the fecal sewage, which is used as a raw material for organic fertilizer processing, alleviates the blockage rate of the subsequent reactor, and improves the operation stability of the system. Preferably, the solid-liquid separator 103 is composed of a screen 1031, an auger 1032, and a spiral shaft 1033, and the screen 1031, the auger 1032, and the spiral shaft 1033 are all made of stainless steel.

[0035] In some embodiments of the present utility model, the biofilm treatment module 200 includes a MABR treatment unit 300 and an MBBR treatment unit 400 arranged from bottom to top, and the solid-liquid separator 103 is connected to the water inlet 301 of the MABR treatment unit 300.

[0036] In the present utility model, the MABR treatment unit 300 is used to degrade organic matter in fecal sewage and denitrify, and the MBBR treatment unit 400 is used for nitrification and phosphorus removal.

[0037] In some embodiments of the present utility model, along the fluid flow direction, the MABR treatment unit 300 includes an anoxic zone 303, an anaerobic zone 304, and anoxic zone 305 separated by two first baffle plates 302. The anoxic zone 303, the anaerobic zone 304, and the anoxic zone 305 are arranged in parallel. The water inlet 301 is located at the bottom of the anoxic zone 303, and the anoxic zone 303 is connected to the solid-liquid separator 103 through the water inlet 301. Through the baffle plate, the sewage in the reaction zone enters from the top and exits from the bottom, and the suspended solids in the sewage can be retained at the bottom of the previous reaction zone, better realizing solid-liquid separation.

[0038] Optionally, a filter screen is provided at the connection port of each reaction zone. More preferably, along the fluid flow direction, the pore size of the filter screen gradually decreases, which can gradually intercept the suspended solids in the sewage and achieve solid-liquid separation.

[0039] Optionally, facultative anaerobic sludge is inoculated in the facultative anaerobic zone 303 and it is filled with sepiolite modified composite filler 306, and the filling rate is 40-60%; anaerobic sludge and denitrifying sludge are respectively inoculated in the anaerobic zone 304 and the anoxic zone 305, and both are filled with modified zero-valent iron zeolite composite filler 307, and the filling rate is 30-50%.

[0040] It can be understood that 3D-printed sepiolite modified composite filler 306 and modified zero-valent iron zeolite composite filler 307 are added to the MABR treatment unit 300, and the 3D melting printing porous core-shell structure is used to strengthen the removal efficiency of organic matter and ammonia nitrogen in the system, enhance the stability and antioxidant properties of the filler, and reduce the filler cost.

[0041] Preferably, pneumatic stirring devices and ORP monitors are provided in the facultative anaerobic zone 303, the anaerobic zone 304 and the anoxic zone 305. Stirring can enhance the contact probability between anaerobic microorganisms and pollutants and improve the treatment efficiency of the system. By monitoring the ORP value, the effect of wastewater treatment can be understood to ensure that harmful substances in the wastewater are effectively removed.

[0042] In some embodiments of the present invention, the MBBR treatment unit 400 includes a transition cavity 401 and an aerobic cavity 402 arranged in parallel and connected. The lower part of the transition cavity 401 is connected to the top of the anoxic zone 305 of the MABR treatment unit 300. Preferably, a filter screen plate 404 is provided at the connection to further intercept the solid suspended solids in the sewage.

[0043] Optionally, the transition cavity 401 and the aerobic cavity 402 are separated by a second baffle plate 403. The aerobic cavity 402 is located on one side of the transition cavity 401. The transition cavity 401 introduces the liquid to be treated into the aerobic cavity 402 through the second baffle plate 403. Aerobic sludge such as nitrifying sludge is inoculated in the aerobic cavity 402. A mud guiding plate 405 is provided at the bottom of the aerobic cavity 402. An aeration system is provided at one end near the top inside the mud guiding plate 405. The aeration system includes a microporous aeration pipe 406 and a blower aerator connected to the microporous aeration pipe 406. The aeration system dissolves oxygen in water in the form of bubbles to supply oxygen to aerobic microorganisms and improve the treatment efficiency of the MBBR system.

[0044] Optionally, a first filler area 407 and a gel layer 408 are provided from bottom to top in the aerobic cavity 402. The first filler area 407 is located above the aeration system. The first filler area 407 is filled with modified activated carbon polyurethane composite filler, and the specific surface area is 950-1050m2 / m 3, with a specific gravity of 0.97 - 1.03 g / cm 3 , with a filling rate of 30 - 55%, for example, a specific surface area of 980 m 2 / m 3 , with a specific gravity of 1.01 g / cm 3 , with a filling rate of 40%; the gel filled in the gel layer 408 is a composite material composed of magnetic bentonite, chitosan, sodium alginate, polyvinyl alcohol, and apple pomace cellulose.

[0045] It can be understood that setting the gel layer 408 above the first filler area 407 can intercept the fillers in the first filler area 407 while strengthening the removal of organic matter, prevent the loss of fillers, shorten the hydraulic retention time, increase the volumetric load, and reduce the investment and operation and maintenance costs.

[0046] Optionally, a dissolved oxygen meter is provided inside the aerobic cavity 402. The bottom of the aerobic cavity 402 is connected to a sludge return pipe 409, and the sludge return pipe 409 is connected to the bottom of the anoxic zone 303. A sludge return solenoid valve 410 is provided on the sludge return pipe 409.

[0047] It can be understood that the dissolved oxygen meter can monitor the oxygen content in the water body in the cavity in real time, adjust the oxygen content according to the monitoring data, and the sludge can be recycled by means of sludge return, reducing costs.

[0048] Optionally, a diversion layer 411 is further provided inside the aerobic cavity 402, and the diversion layer 411 is located at the top of the gel layer 408; the side wall of the diversion layer 411 is connected to a nitrification liquid return pipe 412, and the nitrification liquid return pipe 412 is connected to the anoxic zone 305. A nitrification liquid return solenoid valve 413 is provided on the nitrification liquid return pipe 412 to control the return time and return flow rate.

[0049] In some embodiments of the present invention, the composite ecological floating bed module 700 includes a CW treatment unit 500 for nitrogen and phosphorus resource utilization.

[0050] Optionally, the CW treatment unit 500 is located at the top of the aerobic cavity 402 and is connected to the aerobic cavity 402. The CW treatment unit 500 includes a second filler area 501 and a floating bed area 502 arranged from bottom to top; the second filler area 501 is connected to the aerobic cavity 402 through a mesh sieve plate 504, and the second filler area 501 is filled with modified ethylene-propylene copolymer fillers 511; the floating bed area 502 includes a planting basket 521 and aquatic plants 522, and the aquatic plants 522 can be one or several combinations of canna, calamus, scirpus validus, and cyperus alternifolius.

[0051] It can be understood that the CW treatment unit 500 of the present utility model deeply treats nitrogen and phosphorus in wastewater, deeply removes nitrogen and phosphorus through the modified ethylene-propylene copolymer filler 511, and then realizes the resource utilization of nitrogen and phosphorus through the aquatic plants 522 in the floating bed area 502. When the hydraulic retention time of the MBBR is 15 - 30h, it can not only effectively remove nitrogen and phosphorus, but also has landscape benefits.

[0052] Optionally, the floating bed area 502 is provided with an outlet trough 503, the side wall of the outlet trough 503 is communicated with a water outlet pipe 600, and the water outlet pipe 600 is installed with on-line monitors such as COD, ammonia nitrogen, total phosphorus, total nitrogen, etc. It can be discharged after the monitoring data meets the water quality requirements.

[0053] In some embodiments of the present utility model, it further includes an automatic control system 800. The automatic control system 800 includes a first control system 801, a second control system 802, a third control system 803 and a fourth control system 804. Among them, the first control system 801 is connected to the nitrification liquid reflux solenoid valve 413, the second control system 802 is connected to the aeration system, the third control system 803 is connected to the pneumatic stirring device, and the fourth control system 804 is connected to the sludge reflux solenoid valve 410.

[0054] The working process of the MABR - MBBR - CW coupled sewage treatment system of the present utility model is as follows:

[0055] S1. After the livestock and poultry manure is cleared by a manure scraper, it is pretreated through a grille 102 to remove floating impurities for preliminary solid - liquid separation, and then enters a solid - liquid separator 103 for dry - wet separation.

[0056] S2. The liquid after solid - liquid separation is introduced into the MABR treatment unit 300. The anaerobic microorganisms degrade the organic matter in the wastewater. The facultative oxygen zone 303 is filled with the 3D - printed sepiolite - modified composite filler 306, and the anaerobic zone 304 and the anoxic zone 305 are filled with the modified 3D - printed zero - valent iron zeolite composite filler. Anaerobic phosphorus release occurs in the anaerobic zone 304, and the removal of ammonia nitrogen in the biogas slurry is strengthened in the anoxic zone 305, and denitrification and nitrogen removal are carried out. The hydraulic retention time in the MABR treatment unit 300 is controlled to be 1 - 3d.

[0057] S3. The effluent from the anoxic zone 305 is introduced into the MBBR treatment unit 400 to further degrade the organic matter in the wastewater. The ammonia nitrogen is converted into nitrate nitrogen by strengthening the aeration in the aerobic cavity 402, and the removal of nitrogen and phosphorus is further strengthened through the gel layer 408. The hydraulic retention time in the MBBR treatment unit 400 is controlled to be 18 - 36h.

[0058] S4. Concentrate the effluent from the aerobic cavity 402 and send it to the CW treatment unit 500 for in-depth treatment of nitrogen and phosphorus in the wastewater. Deep denitrification and dephosphorization are achieved through the modified ethylene-propylene copolymer filler 511, and then the nitrogen and phosphorus are resourcefully utilized via the aquatic plants 522 in the floating bed area 502. The hydraulic retention time of the MBBR is 15 - 30 h.

[0059] When the concentrations of COD, BOD5, ammonia nitrogen, and total phosphorus in the fecal sewage entering the system are 3500 mg / L, 3000 mg / L, 450 mg / L, and 50 mg / L respectively, the concentrations of COD, BOD5, ammonia nitrogen, and total phosphorus in the effluent can reach 150 mg / L, 80 mg / L, 70 mg / L, and 7.5 mg / L respectively, meeting the "Pollutant Discharge Standard for Livestock and Poultry Breeding Industries" (GB 18596 - 2001).

[0060] In summary, the process flow of the MABR - MBBR - CW coupled sewage treatment system provided by the present utility model is simple, can significantly shorten the retention time, improve the system volume load, reduce the floor area, and has stable treatment efficiency, high integration level, and is equipped with an online monitoring and automatic control system, realizing unattended operation and remote monitoring, with remarkable economic benefits.

[0061] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present utility model, several improvements and replacements can be made, and these improvements and replacements should also be regarded as the protection scope of the present utility model.

Claims

1. A MABR-MBBR-CW coupled sewage treatment system, characterized in that, It includes a pretreatment module, a biofilm treatment module, a composite ecological floating bed module and an automatic control system that are connected in sequence; The biofilm treatment module includes an MABR treatment unit and an MBBR treatment unit arranged from bottom to top. The MABR treatment unit is connected to the pretreatment module through an inlet at the bottom; the MBBR treatment unit includes a transition cavity and an aerobic cavity arranged in parallel and connected. The MABR treatment unit is connected to the transition cavity through an outlet at the top. A first packing area and a gel layer are arranged from bottom to top in the aerobic cavity; The composite ecological floating bed module includes a CW treatment unit. The CW treatment unit is located at the top of the aerobic cavity and is connected to the aerobic cavity.

2. The MABR-MBBR-CW coupled sewage treatment system according to claim 1, wherein Along the fluid flow direction, the MABR treatment unit includes an anoxic zone, an anaerobic zone and an aerobic zone separated by two first baffle plates. The anoxic zone, the anaerobic zone and the aerobic zone are arranged in parallel; The anoxic zone is connected to the pretreatment module through the inlet. A sepiolite modified composite packing is provided in the anoxic zone, and the filling rate is 40-60%; modified zero-valent iron zeolite composite packings are provided in both the anaerobic zone and the aerobic zone, and the filling rate is 30-50%; and the aerobic zone is connected to the transition cavity through an outlet at the top.

3. The MABR-MBBR-CW coupled sewage treatment system according to claim 1, wherein The transition cavity and the aerobic cavity are separated by a second baffle plate. A mud guide plate is provided at the bottom of the aerobic cavity. An aeration system connected to the automatic control system is provided at one end near the top inside the mud guide plate. The first packing area is located on top of the aeration system.

4. The MABR-MBBR-CW coupled sewage treatment system according to claim 2, wherein A sludge return pipe is connected to the bottom of the aerobic cavity. The sludge return pipe is connected to the anoxic zone. A solenoid valve connected to the automatic control system is provided on the sludge return pipe; A dissolved oxygen meter is provided inside the aerobic cavity.

5. The MABR-MBBR-CW coupled sewage treatment system according to claim 2, wherein A diversion layer is further provided inside the aerobic cavity. The diversion layer is located on top of the gel layer; The diversion layer is connected to a nitrification liquid return pipe. The nitrification liquid return pipe is connected to the aerobic zone. A solenoid valve connected to the automatic control system is provided on the nitrification liquid return pipe.

6. The MABR-MBBR-CW coupled sewage treatment system according to claim 1, wherein The CW treatment unit includes a second packing area and a floating bed area arranged from bottom to top; The second packing area is connected to the aerobic cavity through a screen plate. A modified ethylene-propylene copolymer packing is provided in the second packing area; Aquatic plants are provided in the floating bed area. An outlet pipe is connected to the side wall of the floating bed area. An on-line monitor is installed on the outlet pipe.

7. The MABR-MBBR-CW coupled sewage treatment system according to claim 1, characterized in that, A modified activated carbon polyurethane composite packing is provided in the first packing area, and the filling rate is 30-55%.

8. The MABR-MBBR-CW coupled sewage treatment system according to claim 2, wherein, Pneumatic stirring devices and ORP monitors connected to the automatic control system are provided in both the anoxic zone, the anaerobic zone and the aerobic zone.

9. The MABR-MBBR-CW coupled sewage treatment system according to claim 2, wherein, A filter screen plate is provided at the outlet at the top of the aerobic zone.

10. The MABR-MBBR-CW coupled sewage treatment system according to any one of claims 1-9, characterized in that, The pretreatment module includes a water inlet pipe, a grille and a solid-liquid separator connected in sequence. The solid-liquid separator is connected to the inlet of the MABR treatment unit.

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