CN215208973U

CN215208973U - Integrated anaerobic-micro-aerobic-MBR (membrane bioreactor) sewage treatment system

Info

Publication number: CN215208973U
Application number: CN202022149925.6U
Authority: CN
Inventors: 赵轩; 王浩; 林轲
Original assignee: Sichuan Yinwo Environmental Technology Co ltd
Current assignee: Sichuan Yinwo Environmental Technology Co ltd
Priority date: 2020-09-27
Filing date: 2020-09-27
Publication date: 2021-12-17
Anticipated expiration: 2030-09-27

Abstract

The utility model discloses an integrated anaerobic-micro-aerobic-MBR (membrane bioreactor), which solves the problems of large occupied area, long retention time and the like of the traditional sewage treatment system and is particularly suitable for sewage treatment of villages and small towns in China. The utility model discloses an air supporting sedimentation tank, anaerobism pond, little oxygen aeration tank, MBR membrane reaction tank and the equipment room that connects gradually from the left hand right side are equipped with intercommunication air supporting device between air supporting sedimentation tank and the equipment room, are equipped with intercommunication three's reflux unit between anaerobism pond, little oxygen aeration tank and the MBR membrane reaction tank, are equipped with intercommunication MBR membrane biological reaction device between MBR membrane reaction tank and the equipment room. The utility model has the advantages of simple structure and scientific and reasonable design, convenient to use has realized villages and small towns sewage treatment device miniaturization, automation, emergent, and the transportation and the installation of being convenient for have reduced area and build time, have reduced the emission of mud.

Description

Integrated anaerobic-micro-aerobic-MBR (membrane bioreactor) sewage treatment system

Technical Field

The utility model belongs to the technical field of sewage treatment, concretely relates to integration anaerobism-little oxygen-MBR membrane bioreactor sewage treatment system.

Background

Along with the development of economy, China pays more and more attention to the treatment of water environment, but the previous research on sewage treatment mainly focuses on urban and industrial sewage, the technical development and treatment degree far exceeds that of village sewage, and the village sewage is not paid more attention for years and develops slowly due to the influence of economy and consciousness.

For many years, domestic sewage in villages and towns has various problems, the discharge source is dispersed, the construction of a sewage pipe network is lagged, and the fluctuation of water quality and water quantity is large; meanwhile, people have weak environmental protection consciousness, and a large amount of domestic sewage is discharged randomly without being treated; and the facility and economic conditions are insufficient, so that the operation management difficulty is high; particularly, many water sources, rivers and the like flow through polluted village and town areas to seriously threaten the water supply safety and the health of people, so that the village and town sewage treatment is a very slow way.

The centralized construction of sewage treatment plants has long construction period, high investment cost and difficult management, and is not suitable for the actual condition of village and town sewage in China. Therefore, research and development and popularization adapt to the sewage treatment system in villages and small towns of China have very important effect, the utility model designs an integration anaerobism-little oxygen-MBR membrane bioreactor sewage treatment system, has solved traditional sewage treatment system and has taken up an area of big, technical problem such as dwell time is long, has reduced investment cost, has guaranteed sewage treatment's efficiency simultaneously.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: the sewage treatment system of the integrated anaerobic-micro-aerobic-MBR membrane bioreactor solves the technical problems of large occupied area, long retention time and the like of the traditional sewage treatment system, and is particularly suitable for sewage treatment of villages and towns in China.

In order to achieve the above object, the utility model adopts the following technical scheme:

the integrated anaerobic-micro-aerobic-MBR (membrane bioreactor) sewage treatment system comprises an air floatation sedimentation tank, an anaerobic tank, a micro-aerobic aeration tank, an MBR (membrane bioreactor) and equipment rooms which are sequentially connected from left to right, an air floatation device communicated with the anaerobic tank and the micro-aerobic aeration tank is arranged between the air floatation sedimentation tank and the equipment rooms, a backflow device communicated with the anaerobic tank, the micro-aerobic aeration tank and the MBR is arranged between the anaerobic tank and the MBR, and an MBR membrane bioreactor communicated with the MBR is arranged between the MBR and the equipment rooms.

Further, the air floatation device comprises a scum collecting tank, an air floatation precipitation dosing pipe, an air floatation precipitation air supply pipe and an air floatation pressure stabilizing tank; the air-flotation pressure stabilizing tank is arranged outside the air-flotation sedimentation tank and is connected with a fan arranged in the equipment room through an air-flotation sedimentation air supply pipe; the air flotation precipitation dosing pipe is connected with a dosing system arranged in the equipment room, and the outlet of the air flotation precipitation dosing pipe is connected into the air flotation precipitation tank; the scum collecting tank is arranged in the air floatation sedimentation tank (1) and is distributed at one side close to the air floatation pressure stabilizing tank.

Further, the reflux device comprises an MBR membrane tank reflux pipe/sewage mixing pipe and a gas reflux and supply pipe; the inlet of the return pipe/the sewage mixing pipe of the MBR membrane tank is arranged at the bottom of the MBR membrane reaction tank, and the return pipe/the sewage mixing pipe of the MBR membrane tank is connected into the anaerobic tank through the micro-oxygen aeration tank; the gas reflux gas supply pipe is connected with a fan arranged in the equipment room, and the gas reflux gas supply pipe is connected into the anaerobic tank through the MBR membrane reaction tank and the micro-oxygen aeration tank in sequence.

Further, the MBR membrane biological reaction device comprises a first MBR membrane reactor, an MBR membrane suction pipe, an MBR gas washing pipe and an MBR membrane suction pump; in MBR membrane reaction tank was located to first MBR membrane reactor, be connected with MBR washing tube and MBR membrane suction tube simultaneously, MBR washing tube links to each other with the fan of locating in the equipment room, MBR membrane suction tube links to each other with MBR membrane suction pump, in MBR membrane suction pump located the equipment room, MBR membrane suction pump with locate the ultraviolet disinfector of equipment room in be connected, ultraviolet disinfector exports the integration delivery port of inserting outside being located the equipment room.

Furthermore, a water inlet is formed in the lower portion of the left tank wall of the air flotation sedimentation tank, a grating is obliquely arranged in the water inlet, and the oblique angle is 30-60 degrees.

Furthermore, a sewage water pipe is arranged at the upper part of the air floatation sedimentation tank and connected with a water outlet of the scum collecting tank, and the sewage water pipe is connected into the anaerobic tank.

Furthermore, a filler frame is fixedly welded on the tank wall of the anaerobic tank, and a combined suspension filler is installed on the filler frame.

Furthermore, an aeration pipeline is arranged at the bottom of the micro-oxygen aeration tank, and micro-pore aerators are uniformly distributed on the aeration pipeline.

Furthermore, a second MBR membrane reactor is arranged between the aeration pipeline and the gas return and supply pipe, and the second MBR membrane reactor is distributed close to the MBR membrane reaction tank.

Furthermore, a water outlet of the micro-aerobic aeration tank is arranged between the micro-aerobic aeration tank and the MBR membrane reaction tank, and the distance between the gas reflux and supply pipe and the wall of the micro-aerobic aeration tank is larger than the opening width of the water outlet of the micro-aerobic aeration tank.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model has the advantages of simple structure and scientific and reasonable design, convenient to use has solved traditional sewage treatment system and has taken up an area of big, and the long scheduling problem of dwell time has reduced investment cost, has guaranteed sewage treatment's efficiency, is applicable to china's villages and small towns sewage treatment.

Sewage treatment system be integral structure, include air supporting sedimentation tank, anaerobism pond, little oxygen aeration tank, MBR membrane reaction tank and the equipment room that connects gradually from the left hand right side, be equipped with intercommunication air supporting device between air supporting sedimentation tank and the equipment room, be equipped with intercommunication three's reflux unit between anaerobism pond, little oxygen aeration tank and the MBR membrane reaction tank, be equipped with intercommunication MBR membrane biological reaction unit between MBR membrane reaction tank and the equipment room. Sewage to be treated enters an air flotation sedimentation tank from a water inlet, a dosing system outputs mixed and stirred reagents (degreasing agents or coagulants) into the tank through a dosing pipe of the air flotation sedimentation tank to react with the sewage to form separable flocs, the flocs are mixed with micro bubbles generated by an air flotation device and coagulated into floating oil, the floating oil is collected in a floating slag collecting tank, and effluent flows to an anaerobic tank through a water pipe to perform next reaction. The sewage is fully contacted with the combined suspended filler in the anaerobic tank, and the phosphorus release reaction is completed under the anaerobic action, so that the biological phosphorus removal function is achieved. The sewage after the anaerobic reaction enters a micro-aerobic aeration tank, a micro-porous aerator at the bottom of the micro-aerobic aeration tank provides a micro-aerobic state, short-range nitrification and denitrification are realized, nitrogen-containing compounds are converted into nitrogen to be released, and meanwhile, the second MBR membrane reactor can intercept most of sludge, so that the concentration of the sludge entering the effluent of the MBR membrane reaction tank is reduced. And finally, the effluent entering the MBR membrane reaction tank is subjected to the action of an MBR membrane suction pump to quickly realize the purpose of filtering the effluent, activated sludge and microorganisms are intercepted in the MBR membrane reaction tank, the standard-reaching water is discharged into an ultraviolet sterilizer, and the sewage treatment process is finally completed through ultraviolet sterilization.

The utility model discloses replace traditional two heavy ponds with MBR membrane reaction tank, combine the interior second MBR membrane reactor of little oxygen aeration tank simultaneously, it is big to have solved area, the long problem of dwell time, its integrated equipment has reduced investment cost, and maintained the microorganism concentration in the whole integrated equipment, the nitrification-denitrification efficiency of system has been improved, water pollutant content has been reduced, and the mud emission frequency has been reduced, the mud expense of handling has been reduced, be particularly useful for the sewage treatment of country villages and small towns.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Wherein, the names corresponding to the reference numbers are: 1-an air flotation sedimentation tank, 2-an anaerobic tank, 3-a micro-oxygen aeration tank, 4-an MBR membrane reaction tank, 5-a plant room, 6-a scum collecting tank, 7-an air flotation sedimentation dosing pipe, 8-an air flotation sedimentation air supply pipe, 9-an air flotation pressure stabilizing tank, 10-a fan, 11-a dosing system, 12-an MBR membrane tank return pipe/sewage mixing pipe, 13-an air return pipe, 14-a first MBR membrane reactor, 15-an MBR membrane suction pipe, 16-an MBR air washing pipe, 17-an MBR membrane suction pump, 18-an ultraviolet sterilizer, 19-an integrated water outlet, 20-a water inlet, 21-a sewage water pipe, 22-a filler frame, 23-combined suspended filler, 24-a micro-oxygen aeration pipe and 25-a micro-oxygen aerator, 26-a second MBR membrane reactor, 27-a water outlet of a micro-oxygen aeration tank and 28-an electric cabinet.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but 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, and thus, it should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; of course, mechanical connection and electrical connection are also possible; alternatively, 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.

As shown in the figure, the integrated anaerobic-micro-aerobic-MBR (membrane bioreactor) sewage treatment system solves the problems of large occupied area, long retention time and the like of the traditional sewage treatment system, and is particularly suitable for sewage treatment of villages and towns in China. The utility model discloses an air supporting sedimentation tank 1, anaerobism pond 2, little oxygen aeration tank 3, MBR membrane reaction tank 4 and equipment room 5 that connect gradually from the left hand right side are equipped with intercommunication air supporting device between 5 between air supporting sedimentation tank 1 and the equipment room, are equipped with intercommunication three's reflux unit between anaerobism pond 2, little oxygen aeration tank 3 and the MBR membrane reaction tank 4, are equipped with intercommunication MBR membrane biological reaction unit between 5 between MBR membrane reaction tank 4 and the equipment room.

Sewage to be treated enters an air flotation sedimentation tank 1 from a water inlet 20, a dosing system 11 outputs mixed and stirred agents (degreasing agents or coagulants) into the tank through a dosing pipe 7 of the air flotation sedimentation tank to react with the sewage to form separable flocs, then the flocs are mixed with micro bubbles generated by an air flotation device and condensed into floating oil, the floating oil is collected in a scum collecting tank 6, and effluent flows to an anaerobic tank 2 through a sewage water pipe 21 to perform next reaction. The sewage is fully contacted with the combined suspended filler 23 in the anaerobic tank 2, and the phosphorus release reaction is completed under the anaerobic action, so that the function of biological phosphorus removal is achieved. The sewage after the anaerobic reaction enters the micro-aerobic aeration tank 3, the micro-porous aerator 25 at the bottom of the micro-aerobic aeration tank 3 provides micro-aerobic state to realize short-cut nitrification and denitrification, nitrogen-containing compounds are converted into nitrogen to be released, and meanwhile, the second MBR membrane reactor 26 can intercept most of sludge, so that the concentration of the sludge entering the MBR membrane reaction tank 4 is reduced. And finally, the effluent entering the MBR membrane reaction tank is subjected to the action of an MBR membrane suction pump 17 to quickly realize the purpose of filtering the effluent, activated sludge and microorganisms are intercepted in the MBR membrane reaction tank 4, the standard-reaching water enters an ultraviolet sterilizer 18, and the sewage treatment process is finally completed through ultraviolet sterilization.

Air supporting sedimentation tank 1 be equipped with the air supporting device, sewage and medicament (degreaser or coagulant) form separable flocculation with sewage, mix with the micro-bubble that the air supporting device produced again and condense into the floating oil, rise to the surface of water and collect in dross collecting vat 6. The air flotation sedimentation tank 1 reduces the burden of subsequent biological phosphorus removal through chemical phosphorus removal and prepositive phosphorus removal, and separates out emulsified oil and small suspended particles in sewage through the air flotation effect, thereby reducing the cleaning frequency of an MBR membrane system and prolonging the service life of the MBR membrane. An air flotation pressure stabilizing tank 9 is arranged outside the air flotation sedimentation tank 1, the air flotation pressure stabilizing tank 9 is connected with a fan 10 arranged in the equipment room 5 through an air flotation sedimentation air supply pipe 8, and air conveyed by the fan 10 is compressed through the air flotation pressure stabilizing tank 9 and then released to form micro bubbles to adsorb flocculates.

Micro-aerobic aeration tank 3 in be equipped with micro-aerobic aeration pipe 24, micro-aerobic aeration pipe 24 goes up equipartition micropore aerator 25, carry out the short distance under the micro-aerobic state and nitrify and denitrify, turn into nitrogen gas release with nitrogen compounds, dissolved oxygen control is between 0.2-0.5 mg/L. The second MBR membrane reactor 26 arranged in front of the water outlet 27 of the micro-aerobic aeration tank can effectively avoid the loss of microorganisms, keep the high sludge concentration in the tank, create an environment beneficial to the growth of nitrifying bacteria in the micro-aerobic aeration tank 3, improve the nitrification capability, improve the treatment efficiency of the difficultly degraded macromolecular organic matters and promote the thorough decomposition of the difficultly degraded macromolecular organic matters; meanwhile, the volume load of the MBR membrane reaction tank 4 can be improved, the sludge load is reduced, and the sludge discharge is reduced.

The MBR membrane biological reaction device comprises an MBR membrane biological reaction device which comprises a first MBR membrane reactor 14, an MBR membrane suction pipe 15, an MBR gas washing pipe 16 and an MBR membrane suction pump 17; first MBR membrane reactor 14 is located in MBR membrane reaction tank 4, be connected with MBR air purge tube 16 and MBR membrane suction tube 15 simultaneously, MBR air purge tube 16 links to each other with the fan 10 of locating in 5 equipment rooms, MBR membrane suction tube 15 links to each other with MBR membrane suction pump 17, MBR membrane suction pump 17 is located in 5 equipment rooms, MBR membrane suction pump 17 with locate the ultraviolet disinfector 18 of 5 equipment rooms and be connected, 18 exports of ultraviolet disinfector insert to being located 5 outer integration delivery ports 19 of equipment rooms. Sewage enters the MBR membrane reaction tank 4 after being reacted in the micro-oxygen aeration tank 3, activated sludge and microorganisms are intercepted in the MBR membrane reaction tank 4 through the pumping action of the MBR membrane suction pump 17 and the membrane separation action of the first MBR membrane reactor 14, so that the purpose of filtering effluent is rapidly realized, and the sewage treatment effect and the effluent quality are improved. The MBR air washing pipe 16 uses the power provided by the fan 10 to timely wash the activated sludge and microorganisms attached to the MBR membrane, so as to ensure the stable operation of the MBR membrane reaction tank 4.

The reflux device of the utility model comprises an MBR membrane tank reflux pipe/sewage mixing pipe 12 and a gas reflux and supply pipe 13; the inlet of the MBR membrane tank return pipe/sewage mixing pipe 12 is arranged at the bottom of the MBR membrane reaction tank 4, and the MBR membrane tank return pipe/sewage mixing pipe 12 is connected into the anaerobic tank 2 through the micro-oxygen aeration tank 3; the gas reflux gas supply pipe 13 is connected with a fan 10 arranged in the equipment room 5, and the gas reflux gas supply pipe 13 is connected into the anaerobic tank 2 through the MBR membrane reaction tank 4 and the micro-oxygen aeration tank 3 in sequence.

Equipment room 5 in be equipped with fan 10, electric cabinet 28, medicine system 11, MBR membrane suction pump 15 and ultraviolet disinfector 18, wherein fan 10, medicine system 11, MBR membrane suction pump 15 have all been expounded in the above-mentioned description. The electric cabinet 28 is responsible for providing power output for the whole equipment and keeping stable operation of each part; the ultraviolet disinfector 18 is connected with the MBR membrane reactor 14 through the MBR membrane suction pipe 15, the effluent of the MBR membrane reaction tank 4 enters the ultraviolet disinfector 18, the maintenance cost is low and no secondary pollution is caused by a physical sterilization method, the current ultraviolet disinfection technology is quite mature, and the sewage treatment ultraviolet disinfection equipment can be directly adopted.

The integrated anaerobic-micro-aerobic-MBR (membrane bioreactor) sewage treatment system realizes the miniaturization, automation and emergency of village and town sewage treatment equipment, is convenient to transport and install, and reduces the occupied area and the construction time; the impact load resistance is strong, the nitrogen and phosphorus can be effectively removed, and the effluent reaches the standard of surface IV; meanwhile, the discharging frequency of the excess sludge is low, the secondary pollution can be effectively prevented, the automation degree is high, and the operation and the management are convenient.

Finally, it should be noted that: the above embodiments are only preferred embodiments of the present invention to illustrate the technical solution of the present invention, but not to limit the same, and certainly not to limit the scope of the present invention; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention; that is, the technical problems solved by the present invention are still consistent with the present invention, and all the modifications or colors made in the spirit and the idea of the main design of the present invention are included in the protection scope of the present invention; in addition, will the technical scheme of the utility model direct or indirect application is in other relevant technical field, all including on the same reason the utility model discloses an in the patent protection scope.

Claims

1. Integration anaerobism-little oxygen-MBR membrane bioreactor sewage treatment system, its characterized in that: including air supporting sedimentation tank (1) that connects gradually from the left hand right side, anaerobism pond (2), little oxygen aeration tank (3), MBR membrane reaction tank (4) and equipment room (5), be equipped with intercommunication air supporting device between (5) between air supporting sedimentation tank (1) and the equipment room, anaerobism pond (2), be equipped with intercommunication three's reflux unit between little oxygen aeration tank (3) and the MBR membrane reaction tank (4), be equipped with intercommunication MBR membrane biological reaction device between MBR membrane reaction tank (4) and equipment room (5).

2. The integrated anaerobic-micro aerobic-MBR (membrane bioreactor) sewage treatment system of claim 1, which is characterized in that: the air floatation device comprises a scum collecting tank (6), an air floatation precipitation dosing pipe (7), an air floatation precipitation air supply pipe (8) and an air floatation pressure stabilizing tank (9); the air-flotation pressure-stabilizing tank (9) is arranged outside the air-flotation sedimentation tank (1), and the air-flotation pressure-stabilizing tank (9) is connected with a fan (10) arranged in the equipment room (5) through an air-flotation sedimentation air supply pipe (8); the air flotation precipitation dosing pipe (7) is connected with a dosing system (11) arranged in the equipment room (5), and the outlet of the air flotation precipitation dosing pipe (7) is connected into the air flotation precipitation tank (1); the scum collecting tank (6) is arranged in the air floatation sedimentation tank (1) and is distributed at one side close to the air floatation pressure stabilizing tank (9).

3. The integrated anaerobic-micro aerobic-MBR (membrane bioreactor) sewage treatment system of claim 1, which is characterized in that: the reflux device comprises an MBR membrane tank reflux pipe/sewage mixing pipe (12) and a gas reflux and supply pipe (13); an inlet of a return pipe/sewage mixing pipe (12) of the MBR membrane tank is arranged at the bottom of the MBR membrane reaction tank (4), and the return pipe/sewage mixing pipe (12) of the MBR membrane tank is connected into the anaerobic tank (2) through the micro-oxygen aeration tank (3); the gas reflux gas supply pipe (13) is connected with a fan (10) arranged in the equipment room (5), and the gas reflux gas supply pipe (13) is connected into the anaerobic tank (2) through the MBR membrane reaction tank (4) and the micro-oxygen aeration tank (3) in sequence.

4. The integrated anaerobic-micro aerobic-MBR (membrane bioreactor) sewage treatment system of claim 1, which is characterized in that: the MBR membrane biological reaction device comprises a first MBR membrane reactor (14), an MBR membrane suction pipe (15), an MBR gas washing pipe (16) and an MBR membrane suction pump (17); in MBR membrane reaction tank (4) is located in first MBR membrane reactor (14), be connected with MBR air washing pipe (16) and MBR membrane suction tube (15) simultaneously, MBR air washing pipe (16) link to each other with fan (10) of locating in equipment room (5), MBR membrane suction tube (15) link to each other with MBR membrane suction pump (17), in equipment room (5) are located in MBR membrane suction pump (17), MBR membrane suction pump (17) are connected with ultraviolet disinfector (18) of locating in equipment room (5), ultraviolet disinfector (18) export is inserted to the integration delivery port (19) that is located outside equipment room (5).

5. The integrated anaerobic-micro aerobic-MBR (membrane bioreactor) sewage treatment system of claim 1, which is characterized in that: the lower part of the left tank wall of the air-flotation sedimentation tank (1) is provided with a water inlet (20), a grating is obliquely arranged in the water inlet (20), and the oblique angle is 30-60 degrees.

6. The integrated anaerobic-micro aerobic-MBR (membrane bioreactor) sewage treatment system of claim 2, wherein: the upper part of the air flotation sedimentation tank (1) is provided with a sewage water pipe (21), the sewage water pipe (21) is connected with the water outlet of the scum collecting tank (6), and the sewage water pipe (21) is connected into the anaerobic tank (2).

7. The integrated anaerobic-micro aerobic-MBR (membrane bioreactor) sewage treatment system of claim 1, which is characterized in that: the tank wall of the anaerobic tank (2) is fixedly welded with a filler frame (22), and a combined suspension filler (23) is arranged on the filler frame (22).

8. The integrated anaerobic-micro aerobic-MBR (membrane bioreactor) sewage treatment system of claim 3, wherein: an aeration pipeline (24) is arranged at the bottom of the micro-oxygen aeration tank (3), and micro-hole aerators (25) are uniformly distributed on the aeration pipeline (24).

9. The integrated anaerobic-micro aerobic-MBR (membrane bioreactor) sewage treatment system of claim 8, wherein: a second MBR membrane reactor (26) is arranged between the aeration pipeline (24) and the gas reflux and supply pipe (13), and the second MBR membrane reactor (26) is distributed near the MBR membrane reaction tank (4).

10. The integrated anaerobic-micro aerobic-MBR (membrane bioreactor) sewage treatment system of claim 3, wherein: a micro-oxygen aeration tank water outlet (27) is arranged between the micro-oxygen aeration tank (3) and the MBR membrane reaction tank (4), and the distance between the gas reflux gas supply pipe (13) and the tank wall of the micro-oxygen aeration tank (3) is larger than the opening width of the micro-oxygen aeration tank water outlet (27).