CN214167477U

CN214167477U - Novel sewage treatment device combining MABR and MBR

Info

Publication number: CN214167477U
Application number: CN202022408634.4U
Authority: CN
Inventors: 李均迎
Original assignee: Foshan Aoxin Membrane Technology Co ltd
Current assignee: Foshan Aoxin Membrane Technology Co ltd
Priority date: 2020-10-26
Filing date: 2020-10-26
Publication date: 2021-09-10
Anticipated expiration: 2030-10-26

Abstract

The utility model relates to a novel sewage treatment device of MABR and MBR combination, its technical scheme main points are: the method comprises the following steps: the biological sewage treatment system comprises a water inlet component, a biological reaction tank, an MABR aeration membrane component for carrying out aeration treatment on sewage in the biological reaction tank, a gas supply component for supplying gas to the MABR aeration membrane component, an aerobic MBR tank for carrying out enhanced aeration treatment after the aeration treatment, an MBR component for filtering to obtain purified water after the enhanced aeration treatment and a drainage component for discharging the purified water; the water outlet of the water inlet assembly is communicated with the water inlet of the biological reaction tank, the water outlet of the biological reaction tank is communicated with the water inlet of the aerobic MBR tank, the MBR assembly is installed in the aerobic MBR tank, and the water outlet of the MBR assembly is communicated with the water inlet of the drainage assembly; the MABR aeration membrane component is arranged in the biological reaction tank, and an air outlet of the air supply component is communicated with an air inlet of the MABR aeration membrane component; this application has higher sewage treatment efficiency.

Description

Novel sewage treatment device combining MABR and MBR

Technical Field

The utility model relates to a sewage treatment technical field, more specifically say, it relates to a sewage treatment device of novel MABR and MBR combination.

Background

With the rapid development of domestic economy and the expansion of urbanization, a large amount of domestic and industrial wastewater is not treated up to the standard or is directly discharged to rivers or lakes, so that pollutants in water bodies of the rivers or the lakes exceed the standard, the water bodies are anoxic and eutrophicated, and black and odorous water bodies are formed.

MABR is an advanced aerobic biological treatment process with low energy consumption based on a membrane aeration bioreactor. Due to the characteristics of the MABR membrane, the influence of water depth resistance on the aeration process can be ignored, so that air is not required to be pressurized, and the energy consumption is obviously reduced compared with the traditional aeration process. Constant low-pressure air enters the membrane module through a gap between the breathable membrane and the spacing layer and distributes oxygen into the wastewater. This structure allows for optimal oxygen mass transfer efficiency, with oxygen diffusing from one side of the membrane into the wastewater on the other side by a free diffusion mechanism. The biofilm layer on the surface of the membrane can realize synchronous nitrification and denitrification, and has a very high pollutant removal level compared with the traditional biofilm method.

At present, the main MABR technology adopts a pocket type membrane component form, and the treatment efficiency is lower.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims to provide a sewage treatment device of novel MABR and MBR combination has higher sewage treatment efficiency.

The above technical purpose of the present invention can be achieved by the following technical solutions: a novel sewage treatment device combining MABR and MBR comprises: the biological sewage treatment system comprises a water inlet assembly, a biological reaction tank, an MABR aeration membrane assembly, a gas supply assembly, an aerobic MBR tank, an MBR assembly and a drainage assembly, wherein the water inlet assembly is used for injecting sewage into the biological reaction tank, the biological reaction tank is used for receiving the sewage injected by the water inlet assembly, the MABR aeration membrane assembly is used for carrying out aeration treatment on the sewage in the biological reaction tank to obtain first intermediate water, the gas supply assembly is used for supplying gas to the MABR aeration membrane assembly, the aerobic MBR tank is used for carrying out intensified aeration treatment on the first intermediate water after aeration treatment to obtain second intermediate water, the MBR assembly is used for filtering the second intermediate water after the intensified aeration treatment to obtain purified water, and the drainage assembly is used for discharging the purified water; the water outlet of the water inlet assembly is communicated with the water inlet of the biological reaction tank, the water outlet of the biological reaction tank is communicated with the water inlet of the aerobic MBR tank, the MBR assembly is installed in the aerobic MBR tank, and the water outlet of the MBR assembly is communicated with the water inlet of the drainage assembly; the MABR aeration membrane component is arranged in the biological reaction tank, and the air outlet of the air supply component is communicated with the air inlet of the MABR aeration membrane component.

Optionally, the MABR aeration membrane module comprises: the MABR aeration membrane comprises a plurality of MABR aeration membrane wires, end sockets and mounting frames; the seal head is installed in the installation frame, a groove is formed in the seal head, an air inlet channel is formed in the seal head, a plurality of installation holes communicated with the air inlet channel are formed in the groove, and a plurality of MABR aeration membrane wires are installed in the installation holes in a one-to-one correspondence mode; sealant is filled in the groove; an installation groove is formed in the installation frame, the seal head is installed in the installation groove, an air inlet hole is formed in the installation frame, and the air inlet hole is communicated with the air inlet channel; the air inlet is communicated with the air outlet of the air supply assembly.

Optionally, a plurality of clamping grooves are formed in the outer side of the end socket, and a plurality of elastic clamping blocks which are clamped with the clamping grooves in a one-to-one correspondence manner are arranged in the mounting groove.

Optionally, the section of the elastic fixture block is arc-shaped.

Optionally, the sealing heads and the mounting frames are respectively provided with two sealing heads and are respectively mounted at the upper ends and the lower ends of the plurality of MABR aeration membrane wires; and a ventilation emptying valve is arranged at the air inlet of the mounting frame arranged at the upper end of the MABR aeration membrane wire.

Optionally, the water inlet assembly includes: the sewage treatment system comprises a filtering grid for filtering sewage, a mixed diversion tank for mixing the filtered sewage and sludge, and a sludge pump for refluxing the sludge in the aerobic MBR tank to the mixed diversion tank; the water outlet of the filtering grid is communicated with the water inlet of the mixed water diversion tank; a sludge outlet at the bottom end of the aerobic MBR tank is communicated with a water inlet of the sludge pump, and a water outlet of the sludge pump is communicated with a water inlet of the mixed water diversion tank; and the water outlet of the mixed water diversion tank is communicated with the water inlet of the biological reaction tank.

Optionally, the method further includes: the device comprises an air injection pipe and a stirring fan, wherein the air injection pipe is used for stirring sewage in a biological reaction tank; the gas injection pipe is arranged at the bottom of the biological reaction tank; and the air outlet of the stirring fan is communicated with the air inlet of the air injection pipe.

Optionally, the air supply assembly is a low-pressure oxygen supply fan, an air compressor and/or an oxygen generator.

Optionally, the MABR aeration membrane filaments are tubular MABR aeration membrane filaments made of PVDF or PP.

Optionally, the aerobic MBR tank comprises a tank body, an aeration pipe for injecting oxygen into the tank body, an aeration fan for injecting oxygen into the aeration pipe, and a flushing pipe for flushing the MBR assembly; the aeration pipe is arranged at the bottom of the tank body, and an air inlet of the aeration pipe is communicated with an air outlet of the aeration fan; the flushing pipe is arranged in the tank body and is positioned below the MBR component; the flushing pipe is communicated with the aeration pipe.

To sum up, the utility model discloses following beneficial effect has: when sewage needs to be treated, the sewage is injected into the biological reaction tank only through the water inlet assembly, then air or oxygen is injected into the MABR aeration membrane assembly through the air supply assembly, and the air or the oxygen is dissolved in the sewage through tiny bubbles through the MABR aeration membrane assembly, so that an aerobic microorganism reaction area, an anoxic microorganism reaction area and a sewage area are sequentially arranged from an area close to the MABR aeration membrane assembly to an area far away from the MABR aeration membrane assembly; carrying out nitrification treatment on water in the aerobic microorganism reaction zone, and carrying out denitration treatment on the water in the anoxic microorganism reaction zone; after treatment, first intermediate water is obtained, the first intermediate water is injected into an aerobic MBR tank for enhanced aeration treatment to obtain second intermediate water, then the second intermediate water is filtered by an MBR component to obtain purified water, and finally the purified water is discharged from a water discharge component; sludge in the tank body is discharged to the mixed water diversion tank by a sludge pump for cyclic utilization; thereby having higher sewage treatment efficiency.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the cross-sectional structure of the MABR aeration membrane module of the present invention.

In the figure: 110. filtering the grating; 120. a mixed diversion basin; 130. a sludge pump; 2. a biological reaction tank; 3. an MABR aeration membrane module; 31. MABR aeration membrane filaments; 32. sealing the end; 33. a mounting frame; 4. a gas supply assembly; 51. a tank body; 52. an aeration pipe; 53. an aeration fan; 54. flushing the pipe; 6. an MBR component; 7. a drainage assembly; 8. a groove; 9. an air intake passage; 10. mounting holes; 11. sealing glue; 12. mounting grooves; 13. an air inlet; 14. a card slot; 15. an elastic clamping block; 16. a ventilation evacuation valve; 17. a gas ejector tube; 18. a stirring fan.

Detailed Description

In order to make the objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. Several embodiments of the invention are given in the accompanying drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art. The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature. The terms "vertical," "horizontal," "left," "right," "up," "down," and the like are used for descriptive purposes only and are not intended to indicate or imply that the referenced device or element must be in a particular orientation, constructed and operated, and therefore should not be construed as limiting the present invention.

The present invention will be described in detail with reference to the accompanying drawings and examples.

The utility model provides a novel sewage treatment device of MABR and MBR combination, as shown in figure 1 and figure 2, include: a water inlet component for injecting sewage into the biological reaction tank 2, a biological reaction tank 2 for receiving the sewage injected by the water inlet component, an MABR aeration membrane component 3 for carrying out aeration treatment on the sewage in the biological reaction tank 2 to obtain first intermediate water, a gas supply component 4 for supplying gas to the MABR aeration membrane component 3, an aerobic MBR tank for carrying out intensified aeration treatment on the first intermediate water after the aeration treatment to obtain second intermediate water, an MBR component 6 for filtering the second intermediate water after the intensified aeration treatment to obtain purified water, and a water discharge component 7 for discharging the purified water; the water outlet of the water inlet component is communicated with the water inlet of the biological reaction tank 2, the water outlet of the biological reaction tank 2 is communicated with the water inlet of the aerobic MBR tank, the MBR component 6 is arranged in the aerobic MBR tank, and the water outlet of the MBR component 6 is communicated with the water inlet of the drainage component 7; the MABR aeration membrane component 3 is arranged in the biological reaction tank 2, and the air outlet of the air supply component 4 is communicated with the air inlet of the MABR aeration membrane component 3.

When sewage needs to be treated, the sewage is injected into the biological reaction tank 2 only through the water inlet assembly, then air or oxygen is injected into the MABR aeration membrane assembly 3 through the air supply assembly 4, the air or the oxygen permeates the MABR aeration membrane assembly and is dissolved in the sewage through tiny bubbles, and therefore an aerobic microorganism reaction area, an anoxic microorganism reaction area and a sewage area are sequentially arranged from an area close to the MABR aeration membrane assembly 3 to an area far away from the MABR aeration membrane assembly 3; carrying out nitrification treatment on water in the aerobic microorganism reaction zone, and carrying out denitration treatment on the water in the anoxic microorganism reaction zone; after treatment, first intermediate water is obtained, the first intermediate water is injected into an aerobic MBR tank for enhanced aeration treatment to obtain second intermediate water, the second intermediate water is filtered by an MBR assembly 6 to obtain purified water, and finally the purified water is discharged by a water discharge assembly 7; thereby having higher water treatment efficiency.

Further, the MABR aeration membrane module 3 includes: a plurality of MABR aeration membrane wires 31, sealing heads 32 communicated with the MABR aeration membrane wires 31 and a mounting rack 33; the end enclosure 32 is installed in the installation frame 33, a groove 8 is formed in the end enclosure 32, an air inlet channel 9 is formed in the end enclosure 32, a plurality of installation holes 10 communicated with the air inlet channel 9 are formed in the groove 8, and the MABR aeration membrane wires 31 are installed in the installation holes 10 in a one-to-one correspondence mode; the groove 8 is filled with sealant 11; an installation groove 12 is formed in the installation frame 33, the seal head 32 is installed in the installation groove 12, an air inlet 13 is formed in the installation frame 33, and the air inlet 13 is communicated with the air inlet channel 9; the air inlet hole 13 is communicated with the air outlet of the air supply assembly 4.

In practical application, the air supply assembly 4 injects air or oxygen into the air inlet channel 9 through the air inlet 13, and the air in the air inlet channel 9 enters the MABR aeration membrane filaments 31 and enters the biological reaction tank 2 through the membrane holes; wherein, the mounting holes 10 are distributed in an array, and each row has at least two mounting holes 10, in this embodiment, each row has four mounting holes 10, that is, the MABR aeration membrane wires 31 form four rows of MABR aeration membrane layers; thereby having higher processing efficiency.

Optionally, a plurality of clamping grooves 14 are formed in the outer side of the end socket 32, a plurality of elastic clamping blocks 15 corresponding to the clamping grooves 14 one by one are arranged in the mounting groove 12, and the elastic clamping blocks 15 are correspondingly clamped in the clamping grooves 14 respectively. Since the MABR aeration membrane wires 31 have more aerobic microorganisms attached to the MABR aeration membrane wires 31 after use, the MABR aeration membrane wires 31 need to be cleaned; can dismantle the connection through setting up head 32 and mounting bracket 33, can conveniently wash.

Optionally, in order to facilitate the installation of the sealing head 32 in the installation groove 12, the cross section of the elastic clamping block 15 in this embodiment is arc-shaped.

Furthermore, two end sockets 32 and two mounting frames 33 are arranged and are respectively mounted at the upper end and the lower end of the plurality of MABR aeration membrane wires 31; and a ventilation and evacuation valve 16 is arranged at the air inlet 13 of the mounting frame 33 arranged at the upper end of the MABR aeration membrane wire 31. When sewage is treated, the ventilation emptying valve 16 is closed, sewage in the biological reaction tank 2 can be treated normally, and when ventilation is needed, the ventilation emptying valve 16 is opened and the air supply assembly 4 is replaced, so that air in the MABR aeration membrane wire 31 can be replaced.

Further, the water inlet assembly includes: a filter grid 110 for filtering sewage, a mixed diversion pond 120 for mixing the filtered sewage and sludge, and a sludge pump 130 for returning the sludge in the aerobic MBR tank to the mixed diversion pond 120; the water outlet of the filtering grid 110 is communicated with the water inlet of the mixed water diversion pool 120; a sludge outlet at the bottom end of the aerobic MBR tank is communicated with a water inlet of a sludge pump 130, and a water outlet of the sludge pump 130 is communicated with a water inlet of the mixed water diversion tank 120; the water outlet of the mixed water diversion tank 120 is communicated with the water inlet of the biological reaction tank 2. Sludge in the aerobic MBR tank and filtered sewage are mixed and then discharged into the biological reaction tank 2, so that impurities in the sewage can be prevented from scratching the MABR aeration membrane wires 31, and the sludge contains a large amount of microorganisms, so that the water purification efficiency can be further accelerated.

Further, still include: an air injection pipe 17 for stirring the sewage in the biological reaction tank 2, and a stirring fan 18 for blowing air into the air injection pipe 17; the gas injection pipe 17 is arranged at the bottom of the biological reaction tank 2; the air outlet of the stirring fan 18 is communicated with the air inlet of the air injection pipe 17. In order to avoid frequently taking out and cleaning the MABR aeration membrane wire 31 during sewage treatment; in this embodiment, the MABR aeration membrane wires 31 can be vibrated by the air injection pipes 17 and the stirring fan 18, and microorganisms on the MABR aeration membrane wires 31 are washed away, so that the sewage treatment efficiency is further improved.

Further, the air supply assembly 4 is a low-pressure oxygen supply fan, an air compressor and/or an oxygen generator. In practical application, one or more of a low-pressure oxygen supply fan, an air compressor and an oxygen generator can be selected according to actual needs.

Further, the MABR aeration membrane wires 31 are tubular MABR aeration membrane wires 31 made of PVDF or PP. The MABR aeration membrane wire 31 made of PVDF or PP has stronger toughness and longer service life.

Further, the aerobic MBR tank comprises a tank body 51, an aeration pipe 52 for injecting oxygen into the tank body 51, an aeration fan 53 for injecting oxygen into the aeration pipe 52, and a flushing pipe 54 for flushing the MBR assembly 6; the aeration pipe 52 is arranged at the bottom of the tank body 51, and the air inlet of the aeration pipe 52 is communicated with the air outlet of the aeration fan 53; the flushing pipe 54 is arranged in the tank body 51 and is positioned below the MBR assembly 6; the flushing pipe 54 is in communication with the aeration pipe 52. After the MABR aeration membrane module 3 obtains first intermediate water for sewage treatment, the first intermediate water enters the tank body 51, the aeration fan 53 is started to introduce oxygen into the aeration pipe 52, the aeration pipe 52 injects the oxygen into the tank body 51 to perform intensified aeration on the first intermediate water to obtain second intermediate water, the second intermediate water is filtered by the MBR module 6 and purified water is extracted from the MBR module 6 by the drainage module 7, and in the process of extracting purified water, impurities in the tank body 51 can be adsorbed on the MBR membrane along with water flow, so that the flushing pipe 54 is arranged below the MBR module 6, the flushing pipe 54 is communicated with the aeration pipe 52, so that the oxygen can flush the MBR module 6 through the flushing pipe 54, impurities attached to the MBR module 6 are flushed away, and the filtering efficiency of the MBR module 6 is ensured.

In the specific implementation process, when sewage needs to be treated, the sewage is injected into the biological reaction tank 2 only through the water inlet assembly, then air or oxygen is injected into the MABR aeration membrane assembly 3 through the air supply assembly 4, the air or the oxygen permeates the MABR aeration membrane assembly and is dissolved in the sewage through tiny bubbles, and therefore an aerobic microorganism reaction area, an anoxic microorganism reaction area and a sewage area are sequentially arranged from an area close to the MABR aeration membrane assembly 3 to an area far away from the MABR aeration membrane assembly 3; carrying out nitrification treatment on water in the aerobic microorganism reaction zone, and carrying out denitration treatment on the water in the anoxic microorganism reaction zone; after treatment, first intermediate water is obtained, the first intermediate water is injected into an aerobic MBR tank for enhanced aeration treatment to obtain second intermediate water, the second intermediate water is filtered by an MBR assembly 6 to obtain purified water, and finally the purified water is discharged by a water discharge assembly 7; sludge in the tank body 51 is discharged to the mixed water diversion tank 120 by the sludge pump 130 for recycling.

The utility model discloses a novel sewage treatment device of MABR and MBR combination has higher sewage treatment efficiency.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A novel sewage treatment device combining MABR and MBR is characterized by comprising: the biological sewage treatment system comprises a water inlet assembly, a biological reaction tank, an MABR aeration membrane assembly, a gas supply assembly, an aerobic MBR tank, an MBR assembly and a drainage assembly, wherein the water inlet assembly is used for injecting sewage into the biological reaction tank, the biological reaction tank is used for receiving the sewage injected by the water inlet assembly, the MABR aeration membrane assembly is used for carrying out aeration treatment on the sewage in the biological reaction tank to obtain first intermediate water, the gas supply assembly is used for supplying gas to the MABR aeration membrane assembly, the aerobic MBR tank is used for carrying out intensified aeration treatment on the first intermediate water after aeration treatment to obtain second intermediate water, the MBR assembly is used for filtering the second intermediate water after the intensified aeration treatment to obtain purified water, and the drainage assembly is used for discharging the purified water; the water outlet of the water inlet assembly is communicated with the water inlet of the biological reaction tank, the water outlet of the biological reaction tank is communicated with the water inlet of the aerobic MBR tank, the MBR assembly is installed in the aerobic MBR tank, and the water outlet of the MBR assembly is communicated with the water inlet of the drainage assembly; the MABR aeration membrane component is arranged in the biological reaction tank, and an air outlet of the air supply component is communicated with an air inlet of the MABR aeration membrane component; the water inlet assembly comprises: the sewage treatment system comprises a filtering grid for filtering sewage, a mixed diversion tank for mixing the filtered sewage and sludge, and a sludge pump for refluxing the sludge in the aerobic MBR tank to the mixed diversion tank; the water outlet of the filtering grid is communicated with the water inlet of the mixed water diversion tank; a sludge outlet at the bottom end of the aerobic MBR tank is communicated with a water inlet of the sludge pump, and a water outlet of the sludge pump is communicated with a water inlet of the mixed water diversion tank; and the water outlet of the mixed water diversion tank is communicated with the water inlet of the biological reaction tank.

2. The novel MABR and MBR combined sewage treatment plant according to claim 1, wherein said MABR aeration membrane module comprises: the MABR aeration membrane comprises a plurality of MABR aeration membrane wires, end sockets and mounting frames; the seal head is installed in the installation frame, a groove is formed in the seal head, an air inlet channel is formed in the seal head, a plurality of installation holes communicated with the air inlet channel are formed in the groove, and a plurality of MABR aeration membrane wires are installed in the installation holes in a one-to-one correspondence mode; sealant is filled in the groove; an installation groove is formed in the installation frame, the seal head is installed in the installation groove, an air inlet hole is formed in the installation frame, and the air inlet hole is communicated with the air inlet channel; the air inlet is communicated with the air outlet of the air supply assembly.

3. The novel sewage treatment device combining the MABR and the MBR, according to claim 2, wherein a plurality of clamping grooves are formed on the outer side of the end enclosure, and a plurality of elastic clamping blocks which are correspondingly clamped with the clamping grooves in a one-to-one manner are arranged in the mounting groove.

4. The novel sewage treatment device combining the MABR and the MBR as recited in claim 3, wherein the cross section of the elastic fixture block is arc-shaped.

5. The novel sewage treatment plant combining the MABR and the MBR, according to claim 2, wherein the two sealing heads and the two mounting frames are respectively arranged at the upper end and the lower end of the MABR aeration membrane wires; and a ventilation emptying valve is arranged at the air inlet of the mounting frame arranged at the upper end of the MABR aeration membrane wire.

6. The novel MABR and MBR combined sewage treatment plant of claim 1, further comprising: the device comprises an air injection pipe and a stirring fan, wherein the air injection pipe is used for stirring sewage in a biological reaction tank; the gas injection pipe is arranged at the bottom of the biological reaction tank; and the air outlet of the stirring fan is communicated with the air inlet of the air injection pipe.

7. The novel sewage treatment plant combining an MABR and an MBR according to claim 1, wherein the air supply module is a low pressure oxygen supply fan, an air compressor and/or an oxygen generator.

8. The sewage treatment plant of claim 2, wherein the MABR aeration membrane filaments are tubular MABR aeration membrane filaments made of PVDF or PP.

9. The novel MABR and MBR combined sewage treatment plant of claim 1, wherein the aerobic MBR tank comprises a tank body, an aeration pipe for injecting oxygen into the tank body, an aeration fan for injecting oxygen into the aeration pipe, and a flushing pipe for flushing MBR components; the aeration pipe is arranged at the bottom of the tank body, and an air inlet of the aeration pipe is communicated with an air outlet of the aeration fan; the flushing pipe is arranged in the tank body and is positioned below the MBR component; the flushing pipe is communicated with the aeration pipe.