CN112759078A

CN112759078A - Integrated sewage treatment device and method

Info

Publication number: CN112759078A
Application number: CN202011489988.4A
Authority: CN
Inventors: 任海勇; 高天阳; 陈亦力; 任凤伟
Original assignee: Biyuan Water Source Membrane Technology Research Center Beijing Co ltd
Current assignee: Biyuan Water Source Membrane Technology Research Center Beijing Co ltd
Priority date: 2020-12-16
Filing date: 2020-12-16
Publication date: 2021-05-07

Abstract

An integrated sewage treatment device and a method belong to the technical field of sewage treatment. The sewage treatment process comprises the following steps: the ammonia nitrogen is converted into nitrate nitrogen through nitration reaction in an aerobic environment, and the nitrate nitrogen is converted into nitrogen through denitrification reaction in an anoxic environment, so that denitrification is realized; meanwhile, activated sludge is left in the system by utilizing the membrane separation performance of the MBR, so that the yield of excess sludge is reduced, and the high-concentration microbial biomass of the system is kept; the membrane module performs periodic in-situ membrane cleaning through reciprocating motion of the membrane module, and the sludge adsorbed on the surface of the membrane wires is desorbed through mutual collision and friction between the membrane wires and a water body, so that the use frequency and concentration of chemical liquid medicine are reduced, the damage of the chemical liquid medicine to the state of the membrane wires is reduced, the service life of the membrane module is prolonged, and the operation and maintenance cost of equipment is reduced; meanwhile, the resistance of water flowing through the membrane is reduced, the permeability of micropores on the surface of the membrane filaments is maintained, the MBR running flux is improved, and the running stability of equipment is enhanced.

Description

Integrated sewage treatment device and method

Technical Field

The invention relates to an integrated sewage treatment device and method, belonging to the technical field of sewage treatment.

Background

MBR sewage treatment has the characteristics of high solid-liquid separation efficiency, high activated sludge concentration, low excess sludge yield and the like, and realizes the complete separation of Hydraulic Retention Time (HRT) and sludge age (SRT), so that the operation control is more flexible and stable, the automatic control is easy to realize, and the operation management is convenient. However, in the process of MBR sewage treatment, suspended matters such as particles, colloidal particles or solute macromolecules in sewage tend to be adsorbed and deposited on the surface or in membrane pores to cause the blockage of MBR, thereby affecting the degradation and filtration efficiency of MBR, namely, the stable operation and wide application of MBR sewage treatment process are seriously restricted by the problem of membrane pollution, and the occurrence of the suspended matters can directly cause the great reduction of membrane flux, the rapid increase of transmembrane pressure difference and even the abnormal operation of MBR system.

At present, MBR technologies are mainly divided into two types, one is an immersed membrane bioreactor (namely a built-in type), and refers to equipment which is used for immersing a membrane component in a biological reaction tank, performing biochemical reaction on pollutants in the biological reaction tank and performing solid-liquid separation by using a membrane; the other is an external membrane bioreactor, which means that a membrane component and a biological reaction tank are separately arranged, the active sludge mixed liquor in the biological reaction tank is pumped into a membrane component for solid-liquid separation, and the concentrated mud water of the system is mixed and refluxed to the biological reaction tank to form circulation. Generally, the external MBR adopts high-speed water flow scouring as a mode for slowing down membrane pollution, but the external MBR has high energy consumption, and the damage degree of membrane filaments caused by long-term water flow scouring is immeasurable, so that the conditions of membrane life reduction, MBR operation instability and the like are easily caused; the built-in MBR usually adopts a continuous gas aeration mode, the membrane pollution rate is slowed down by utilizing the shaking of gas to membrane filaments and the scouring of the membrane surface, but the mode is easy to generate a large amount of foam on one hand, the gas utilization efficiency is low, the energy waste is caused, on the other hand, the removal effect of the total nitrogen of the system is poor due to the increase of dissolved oxygen in the environment, the water quality of the produced water of the MBR is influenced, and on the other hand, the service life of the MBR is influenced due to the problem of hair winding at the root parts of the membrane filaments generated.

With the promotion of urbanization in China and the adjustment of industrial structures, a large number of small towns with economic development areas and industrial parks are built, the discharge amount of domestic sewage is in the trend of increasing year by year, and due to the factors of imperfect drainage systems, lack of sewage treatment facilities and the like, domestic sewage rich in a large number of pathogenic bacteria, nitrogen, phosphorus and organic matters is discharged without being effectively treated, so that the local water environment is seriously influenced. In recent years, governments have also invested a great deal of effort to treat domestic sewage in villages and towns, and integrated sewage treatment equipment is currently common village and town sewage treatment equipment due to the characteristic of high integration, but the integrated sewage treatment equipment only scales the process of sewage treatment plants, and the traditional sewage treatment technology with complex operation process, difficult maintenance and high energy consumption cannot be effectively applied in consideration of the particularity of dispersed pollution sources, irregular discharge, difficult collection of pipe networks, unstable water quality and water quantity of the sewage treatment plants in villages and towns.

The Membrane Bioreactor (MBR) technology is a high-efficiency sewage treatment technology combining a membrane separation technology and a biological treatment technology, and has the characteristics of high separation efficiency, low residual sludge yield, small occupied area, high sludge-water separation efficiency and biochemical reaction rate, convenience in operation and management, easiness in realizing automatic control and the like. Compared with the conventional sewage treatment process, the MBR sewage treatment process takes the membrane as a separation medium to replace a traditional secondary sedimentation tank for gravity precipitation solid-liquid separation, an MBR membrane bioreactor is arranged in the membrane tank, under the negative pressure action of a suction pump, clear water can enter the inside of the membrane filaments through micropores on the surfaces of the membrane filaments, and sludge particles can not penetrate through the micropores and are intercepted in sewage, so that the solid-liquid separation is quickly realized. However, the conventional MBR process is mainly applied to sewage treatment in an engineering form, belongs to a site-fixed building, and is characterized in that each engineering device is independently and separately arranged, so that the process flow is long, the construction scale is large, the MBR process is immovable, the process is not easy to control, and for sewage treatment and reclaimed water recycling with small scale, particularly, the MBR process is not applicable to projects with dispersed sewage sources, unstable water quality and quantity, short working and running period and lack of professional operation and maintenance personnel, and can generate very large labor and financial consumption.

The prior art has the following disadvantages: (1) the integrated treatment equipment only scales the process of the sewage treatment plant, does not consider the particularity of dispersion of town sewage pollution sources, unstable water quality and quantity and the like, and cannot be effectively applied to the traditional sewage treatment technology with complex operation process, difficult maintenance and higher energy consumption; (2) the conventional MBR process is mainly applied to sewage treatment in an engineering form, belongs to a site-fixed building, has long process flow, large construction scale, is immovable, is not easy to control the process, and is not suitable for village and town sewage treatment engineering; (3) the MBR process usually controls membrane pollution in a continuous gas aeration mode, but the mode easily generates a large amount of foam, has low gas utilization efficiency and causes energy waste, on one hand, the removal effect of total nitrogen of a system is poor due to the increase of dissolved oxygen in the environment, the water quality of produced water of the MBR is influenced, and on the other hand, the service life of the MBR is influenced due to the problem of hair winding at the root of membrane filaments generated by aeration; (4) when the MBR membrane is seriously polluted, the running state of the MBR is recovered by a common chemical cleaning mode, but the mode improves the equipment maintenance cost on one hand, and particularly, the MBR can not be normally used due to the lack of professional personnel for carrying out related maintenance on the membrane module in remote villages and towns, on the other hand, the damage degree of chemical liquid medicine to membrane filaments and the membrane module device per se can not be estimated, and the stable running of the MBR can be influenced when the pollution is serious; (5) the non-aeration MBR adopts ultrasonic wave, electromagnetic vibration or mechanical shaking to control membrane pollution, but the motion form, process design and operation stability of the MBR still need to be improved.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides an integrated sewage treatment device and method.

An integrated sewage treatment device, wherein an anoxic tank, an aerobic tank, a membrane tank and an equipment room which are sequentially arranged are separated by a partition plate in a box body, wherein the anoxic tank is communicated with the bottom of the aerobic tank, the aerobic tank is communicated with the top of the membrane tank, and the equipment room is connected with the membrane tank; the outer wall of a framework of the box body is of a steel contour plate structure, the anoxic tank is connected with the pretreatment unit, the stirrer and the anoxic biochemical area, the first water inlet pipe is connected with the first valve, the other end of the first valve is connected with the water inlet lifting pump, the other end of the water inlet lifting pump is connected with the second water inlet pipe, the other end of the second water inlet pipe is communicated with the pretreatment unit of the anoxic tank, a basket grid is arranged in the pretreatment unit, the aerobic tank is connected with the micropore aerators, the emptying units and the reflux units, the micropore aerators are arranged at the bottom of the aerobic tank in an array manner, one ends of the micropore aerators are connected with the air blower through aeration pipelines and third valves, the third valve is connected between the air blower and the micropore aerators, the emptying units are arranged at the lower parts of the micropore aerators, the second emptying pipe is connected; the reflux unit is arranged on the upper part of the aerobic tank, the reflux unit comprises a second valve, a nitrifying liquid reflux pump and a nitrifying liquid reflux pipe, one end of the second valve is connected with the aerobic tank, the other end of the second valve is connected with the nitrifying liquid reflux pump, the other end of the nitrifying liquid reflux pipe is connected with the nitrifying liquid reflux pipe, the other end of the nitrifying liquid reflux pipe is connected with the anoxic tank, the aerobic tank is communicated with the top of the membrane tank, a low-energy-consumption membrane bioreactor, a reflux unit and an emptying unit are arranged in the membrane tank, the low-energy-consumption membrane bioreactor comprises a transmission mechanism, a carriage mechanism, a membrane module and a water collection unit, the transmission mechanism and the carriage mechanism are arranged on the top of the tank body, the transmission mechanism is connected with the carriage mechanism, the membrane module can mechanically reciprocate in the horizontal direction, the water collection unit comprises a second water outlet pipe, a fourth valve and a water production, the other end of fourth valve is connected and is produced the water pump, produce the other end of water pump and connect first outlet pipe, the membrane group ware lower part is arranged in to the backward flow unit, the backward flow unit includes first mud back flow, second mud back flow, the sixth valve, the mud backwash pump, the second mud back flow is placed in membrane group ware lower part, the second mud back flow is connected with first mud back flow, the sixth valve is connected to the other end of first mud back flow, the mud backwash pump is connected to the other end of sixth valve, good oxygen pond is connected to the other end of mud backwash pump, the evacuation unit is arranged in second mud back flow lower part, including fifth valve and first evacuation pipe, the one end of first evacuation pipe and the bottom intercommunication in membrane pond, the fifth valve is connected to the other end of first evacuation pipe.

The integrated sewage treatment method comprises the following steps:

the sewage treatment process comprises the following steps: the ammonia nitrogen is converted into nitrate nitrogen through nitration reaction in an aerobic environment, and the nitrate nitrogen is converted into nitrogen through denitrification reaction in an anoxic environment, so that denitrification is realized; meanwhile, activated sludge is left in the system by utilizing the membrane separation performance of the MBR, so that the yield of excess sludge is reduced, and the high-concentration microbial biomass of the system is kept;

and (3) low-energy MBR process steps: the membrane bioreactor with low energy consumption replaces the traditional aeration membrane bioreactor, namely, the membrane bioreactor is driven by a speed reducing motor to perform regular mechanical reciprocating motion, so that membrane filaments and a water body form relative motion, under the condition of low membrane surface flow velocity ratio, the phenomenon of membrane surface concentration polarization is effectively scrubbed and controlled by means of inertia force, and the anti-pollution performance of the membrane filaments is improved and enhanced;

in-situ membrane cleaning: the low-energy-consumption MBR process can perform periodic in-situ membrane cleaning through the reciprocating motion of the membrane module, desorbs the sludge adsorbed on the surface of the membrane wires through the mutual collision and friction between the membrane wires and a water body, reduces the cleaning frequency and concentration of chemical liquid medicine, and reduces the damage of the chemical liquid medicine to the state of the membrane wires; meanwhile, the resistance of water flowing through the membrane is reduced, the permeability of micropores on the surface of the membrane filaments is kept, and the MBR running flux is improved.

The invention has the advantages that the box body adopts an integrated modular design, has low manufacturing cost, compact structure, small occupied area and convenient transportation and maintenance, and is suitable for treating the decentralized village and town domestic sewage; by adopting the sewage treatment process, the biochemical treatment efficiency and the solid-liquid separation efficiency are high, the effluent quality is good, and the equipment runs stably; the membrane pool is internally provided with the low-energy-consumption membrane bioreactor, namely, the aeration device is replaced by the mechanical reciprocating motion of the membrane group device, so that on one hand, the energy consumption is reduced by about 40-60%, the operation and investment cost of equipment is saved, on the other hand, the problem of membrane pollution possibly caused by uneven aeration or hair accumulation at the root of membrane filaments and other factors is solved, the operation stability of the equipment is improved, on the other hand, an anoxic environment is created, the membrane pool can be used as a post-anoxic treatment unit, the denitrification effect of a biochemical system is enhanced, and the effluent quality of the equipment is further improved.

In addition, the low-energy MBR process can perform periodic in-situ membrane cleaning through the reciprocating motion of the membrane module, desorbs the sludge adsorbed on the surface of the membrane filaments through the mutual collision and friction between the membrane filaments and the water body, reduces the use frequency and concentration of chemical liquid medicine, reduces the damage of the chemical liquid medicine to the membrane filament state, prolongs the service life of the membrane module, and reduces the operation and maintenance cost of equipment; meanwhile, the resistance of water flowing through the membrane is reduced, the permeability of micropores on the surface of the membrane filaments is maintained, the MBR running flux is improved, and the running stability of equipment is enhanced.

Drawings

A more complete appreciation of the invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein the accompanying drawings are included to provide a further understanding of the invention and form a part of this specification, and wherein the illustrated embodiments of the invention and the description thereof are intended to illustrate and not limit the invention, as illustrated in the accompanying drawings, in which:

FIG. 1 is a schematic view of the process flow and connection structure of the present invention.

Fig. 2 is a schematic structural diagram of the present invention.

In the figure: the device comprises a first water inlet pipe 1, a first valve 2, a water inlet lifting pump 3, a second water inlet pipe 4, a box body 5, a pretreatment unit (built-in basket lifting grid) 6, a stirrer 7, a nitrifying liquid return pipe 8, a nitrifying liquid return pump 9, a second valve 10, a sliding frame mechanism 11, a transmission mechanism 12, an equipment room 13, a first water outlet pipe 14, an air blower 15, an aeration pipeline 16, a membrane module 17, a water production pump 18, a third valve 19, a fourth valve 20, a second water outlet pipe 21, a fifth valve 22, a first emptying pipe 23, a first sludge return pipe 24, a second sludge return pipe 25, a sixth valve 26, a sludge return pump 27, a membrane tank 28, a microporous aerator 29, a second emptying pipe 30, a seventh valve 31, an aerobic tank 32, an anoxic tank 33, a transmission motor 34, a sliding frame 35, a track 36 and a rolling wheel 37.

The invention is further illustrated with reference to the following figures and examples.

Detailed Description

It will be apparent that those skilled in the art can make many modifications and variations based on the spirit of the present invention.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element, component or section is referred to as being "connected" to another element, component or section, it can be directly connected to the other element or section or intervening elements or sections may also be present. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art.

The following examples are further illustrative in order to facilitate the understanding of the embodiments, and the present invention is not limited to the examples.

Example 1: as shown in fig. 1 and 2, in the integrated sewage treatment device, an anoxic tank 33, an aerobic tank 32, a membrane tank 28 and an equipment room 13 are sequentially arranged in a box body 5 and separated by a partition plate, wherein the anoxic tank 33 is communicated with the bottom of the aerobic tank 32, the aerobic tank 32 is communicated with the top of the membrane tank 28, and the equipment room 13 is connected with the membrane tank 28; the outer wall of the framework of the box body 5 is of a Q235 steel compression plate structure, the anoxic tank 33 is connected with the pretreatment unit 6, the stirrer 7 and the anoxic biochemical region, the first water inlet pipe 1 is connected with the first valve 2, the other end of the first valve 2 is connected with the water inlet lifting pump 3, the other end of the water inlet lifting pump 3 is connected with the second water inlet pipe 4, the other end of the second water inlet pipe 4 is communicated with the pretreatment unit 6 of the anoxic tank 33, a basket grid is arranged in the pretreatment unit 6, the aerobic tank 32 is connected with the microporous aerator 29, the emptying unit and the reflux unit, the microporous aerator 29 is arranged at the bottom of the aerobic tank 32 in an array manner, one end of the microporous aerator 29 is connected with the air blower 15 through an aeration pipeline 16 and a third valve 19 and used for providing air into the aerobic tank 32, the third valve 19 is connected between the air blower 15 and the microporous aerator 29, the emptying unit is arranged at the lower part of the microporous aerator 29, the second emptying pipe 30 is arranged at the bottom of the microporous aerator 29 and is used for discharging sludge deposited at the bottom of the aerobic tank 32; the reflux unit is arranged on the upper part of the aerobic tank 32 and comprises a second valve 10, a nitrifying liquid reflux pump 9 and a nitrifying liquid reflux pipe 8, one end of the second valve 10 is connected with the aerobic tank 32, the other end of the second valve 10 is connected with the nitrifying liquid reflux pump 9, the other end of the nitrifying liquid reflux pump 9 is connected with the nitrifying liquid reflux pipe 8, the other end of the nitrifying liquid reflux pipe 8 is connected with the anoxic tank 33, the aerobic tank 32 is communicated with the top of the membrane tank 28, a low-energy-consumption membrane bioreactor, a reflux unit and an emptying unit are arranged in the membrane tank 28, the low-energy-consumption membrane bioreactor comprises a transmission mechanism 12, a sliding frame mechanism 11, a membrane unit 17 and a water collecting unit, the transmission mechanism 12 and the sliding frame mechanism 11 are arranged on the top of the box 5, the transmission mechanism 12 is connected with the sliding frame mechanism 11, the membrane unit 17 is connected with the sliding frame mechanism 11, A fourth valve 20 and a water production pump 18, wherein two ends of a second water outlet pipe 21 are respectively connected with the membrane module 17 and the fourth valve 20, the other end of the fourth valve 20 is connected with the water production pump 18, the other end of the water production pump 18 is connected with the first water outlet pipe 14, a backflow unit is arranged at the lower part of the membrane module 17 and comprises a first sludge backflow pipe 24, a second sludge backflow pipe 25, a sixth valve 26 and a sludge backflow pump 27, the second sludge backflow pipe 25 is arranged at the lower part of the membrane module 17, the second sludge backflow pipe 25 is connected with the first sludge backflow pipe 24, the other end of the first sludge backflow pipe 24 is connected with the sixth valve 26, the other end of the sixth valve 26 is connected with the sludge backflow pump 27, the other end of the sludge backflow pump 27 is connected with an aerobic tank 32 and used for returning sludge concentrated liquid in the membrane tank 28 to the aerobic tank 32, an emptying unit is arranged at the lower part of the second sludge backflow pipe 25 and comprises a fifth valve 22 and, one end of the first emptying pipe 23 is communicated with the bottom of the membrane pool 28, the other end of the first emptying pipe 23 is connected with the fifth valve 22, the fifth valve is used for discharging residual sludge in the membrane pool 28, and the integrated equipment in the equipment room 13 is of a whole integrated skid-mounted structure and comprises an air blower 15, a water production pump 18 and a control device.

The control device comprises an automatic control system, a membrane cleaning system, a dosing system, an instrument system and an ultraviolet disinfection system.

The automatic control system comprises an operation control system and a data transmission system, wherein the operation control system comprises water production control, vibration control, backwashing control and the like and is used for intelligently and remotely controlling the stable operation of the integrated sewage treatment device; the data transmission system is connected with the instrument system and used for remote feedback of data, and timely adjustment of the operation parameters of the device is facilitated.

The membrane cleaning system comprises a water backwashing system and a medicine backwashing system, is generally started when the in-situ vibration cleaning can not effectively recover the state of the membrane module device, and is used for carrying out online backwashing on the membrane module device so as to improve the running state of the membrane module device.

The dosing system comprises a backwashing dosing system and a phosphorus removal dosing system, wherein the backwashing dosing system is used for adding a chemical cleaning agent of the backwashing system, and the phosphorus removal dosing system is used for adding a phosphorus removal agent, so that the phosphorus removal function of the system is improved, and higher effluent quality is obtained.

The instrument system comprises a liquid flowmeter, a gas flowmeter, a vacuum pressure gauge and a water quality monitoring instrument, wherein the liquid flowmeter is used for monitoring the water outlet flow of the anoxic tank, the aerobic tank and the membrane tank, the gas flowmeter is used for monitoring and adjusting the air outlet flow of the air blower, the vacuum pressure gauge is used for monitoring the transmembrane pressure difference of the MBR membrane group device, and the water quality monitoring instrument is used for continuously monitoring the water outlet quality in real time.

The ultraviolet disinfection system is used for performing ultraviolet disinfection on the effluent of the membrane tank, and improving the quality of the effluent so as to meet the discharge requirements of different effluents.

The low-energy-consumption membrane bioreactor comprises a transmission mechanism 12, a sliding frame mechanism 11 and a membrane bioreactor 17, wherein the transmission mechanism 12 comprises a transmission motor 34, the sliding frame mechanism 11 comprises a sliding frame 35, a track 36 and a rolling wheel 37, the rolling wheel 37 is arranged on the upper part of the track 36, and the sliding frame 35 is arranged on the upper part of the rolling wheel 37; the film assembly device 17 is supported by the sliding frame 35, the film assembly device 17 is driven by the track 36, the rolling wheel 37 and the transmission motor 34 to do regular horizontal reciprocating motion,

the connection relationship between the track 36, the rolling wheel 37 and the transmission motor 34 and the film assembly device 17 provides output power for the transmission motor 34, the sliding frame 35 supports the film assembly device 17, and the track 36, the rolling wheel 37 and the transmission motor 34 drive the film assembly device 17 to perform mechanical reciprocating motion. The transmission motor 34 is arranged at the upper part of the membrane pool 28 and fixed at the top of the box body 5, the transmission motor is connected with the sliding frame 35 through an output arm, the sliding frame 35 is installed on a track 36, the upper parts of the cross beams at the two sides of the sliding frame 35 support the membrane module 17, the bottom of the sliding frame is provided with a plurality of rolling wheels 37, and the rolling wheels 37 horizontally reciprocate on the track 36 to further drive the membrane module 17 to mechanically horizontally reciprocate.

Example 2: as shown in fig. 1 and 2, the integrated sewage treatment device and method, the low-energy MBR process and the in-situ membrane cleaning mode ensure high-efficiency, low-energy consumption and stable operation of the MBR integrated sewage treatment equipment.

(1) A movable integrated sewage treatment device is adopted, namely an anoxic tank, an aerobic tank, a membrane tank and a device room which are sequentially arranged are separated by a partition plate in a box body structure, wherein the anoxic tank is communicated with the bottom of the aerobic tank, the aerobic tank is communicated with the top of the membrane tank, and the device room is close to the membrane tank; the box body adopts an integrated modular design, the production quality and the production period are controllable, the manufacturing cost is low, the structure is compact, the occupied area is small, the transportation and the maintenance are convenient, the full-automatic operation and the remote intelligent monitoring can be realized, and the device is suitable for treating the distributed village and town domestic sewage;

(2) a sewage treatment process is adopted, wherein ammonia nitrogen is converted into nitrate nitrogen through nitration reaction in an aerobic environment, and the nitrate nitrogen is converted into nitrogen through denitrification reaction in an anoxic environment, so that denitrification is realized; active sludge is left in the system by utilizing the membrane separation performance of MBR, so that the yield of excess sludge is reduced, the sludge treatment cost is saved, the high-concentration microbial biomass of the system is kept, the removal capacity of the system on ammonia nitrogen and organic matters is improved, the impact load resistance is strong, the effluent quality is good, and the process operation is stable;

(3) the membrane bioreactor adopts a low-energy-consumption MBR process, replaces the traditional aeration membrane bioreactor, namely, drives the membrane group device to perform regular mechanical reciprocating motion through a speed reducing motor, so that membrane filaments and a water body form relative motion, effectively scrubs and controls the phenomenon of concentration polarization of the membrane surface by means of inertia force under the condition of low membrane surface flow velocity ratio, and remarkably improves and strengthens the anti-pollution performance of the membrane filaments; because the process is not provided with an aeration device and only carries out solid-liquid separation in a mechanical reciprocating motion mode, on one hand, the energy consumption is reduced by 40-60%, the operation and investment cost of the equipment is saved, on the other hand, the problem of membrane pollution possibly caused by uneven aeration or hair accumulation at the root of membrane wires and other factors is solved, the operation stability of the equipment is improved, on the one hand, an anoxic environment is created and can be used as a post-anoxic treatment unit to strengthen the denitrification effect of a biochemical system and further improve the effluent quality of the equipment;

(4) in addition, the low-energy MBR process can perform periodic in-situ membrane cleaning through the reciprocating motion of the membrane module, and desorbs the sludge adsorbed on the surface of the membrane wires through the mutual collision and friction between the membrane wires and the water body, so that the use frequency and the concentration of chemical liquid medicine are reduced, the damage of the chemical liquid medicine to the state of the membrane wires is reduced, the service life of the membrane module is prolonged, and the operation and maintenance cost of equipment is reduced; meanwhile, the resistance of water flowing through the membrane is reduced, the permeability of micropores on the surface of the membrane filaments is maintained, the MBR running flux is improved, and the running stability of equipment is enhanced.

An integrated sewage treatment device, namely an anoxic tank, an aerobic tank, a membrane tank and an equipment room are separated by a partition plate in a box body structure; the box body is in an integrated modular design, is low in manufacturing cost, compact in structure, small in occupied area and convenient to transport and maintain, and is suitable for treating distributed village and town domestic sewage; the design process is a sewage treatment process, the biochemical treatment efficiency and the solid-liquid separation efficiency are high, the effluent quality is good, and the equipment runs stably; the membrane pool is internally provided with the low-energy-consumption membrane bioreactor, namely, the mechanical reciprocating motion of the membrane group device is used for replacing aeration, so that on one hand, the energy consumption is reduced by about 40-60%, the operation and investment cost of equipment is saved, on the other hand, the problem of membrane pollution possibly caused by uneven aeration or hair accumulation at the root of membrane filaments and other factors is solved, the operation stability of the equipment is improved, on the other hand, an anoxic environment is created, the membrane pool can be used as a post-anoxic treatment unit, the denitrification effect of a biochemical system is enhanced, and the effluent quality of the equipment is further improved.

In addition, the low-energy MBR process can perform periodic in-situ membrane cleaning through the reciprocating motion of the membrane module, desorbs the sludge adsorbed on the surface of the membrane wires through the mutual collision and friction between the membrane wires and the water body, reduces the cleaning frequency and concentration of chemical liquid medicine, reduces the damage of the chemical liquid medicine to the membrane wire state, prolongs the service life of the membrane module, and reduces the operation and maintenance cost of equipment; meanwhile, the resistance of water flowing through the membrane is reduced, the permeability of micropores on the surface of the membrane filaments is maintained, the MBR running flux is improved, and the running stability of equipment is enhanced.

The integrated sewage treatment device adopts movable integrated sewage treatment equipment, namely an anoxic tank, an aerobic tank, a membrane tank and an equipment room which are sequentially arranged are separated by a partition plate in a box body structure, wherein the anoxic tank is communicated with the bottom of the aerobic tank, the aerobic tank is communicated with the top of the membrane tank, and the equipment room is close to the membrane tank; the box adopts integral type modularized design, and production quality and cycle are controllable, and low in cost, compact structure, area are little, and the transportation and the maintenance of being convenient for can realize full automatic operation and long-range intelligent monitoring, are applicable to and handle distributed villages and small towns domestic sewage.

According to the characteristics of dispersion, instability and the like of domestic sewage in villages and small towns, an integrated sewage treatment process is designed and adopted, wherein ammonia nitrogen is converted into nitrate nitrogen through nitration reaction in an aerobic environment, and the nitrate nitrogen is converted into nitrogen through denitrification reaction in an anoxic environment, so that denitrification is realized; the activated sludge is left in the system by utilizing the membrane separation performance of the MBR, so that the yield of excess sludge is reduced, the sludge treatment cost is saved, the high-concentration microbial biomass of the system is kept, the removal capacity of the system on ammonia nitrogen and organic matters is improved, the impact load resistance is strong, the effluent quality is good, and the process operation is stable.

The membrane bioreactor adopts a low-energy-consumption MBR process, replaces the traditional aeration membrane bioreactor, namely, drives the membrane group device to perform regular mechanical reciprocating motion through a speed reducing motor, so that membrane filaments and a water body form relative motion, effectively scrubs and controls the phenomenon of concentration polarization of the membrane surface by means of inertia force under the condition of low membrane surface flow velocity ratio, and remarkably improves and strengthens the anti-pollution performance of the membrane filaments; because the process is not provided with an aeration device and only carries out solid-liquid separation in a mechanical reciprocating motion mode, on one hand, the energy consumption is reduced by about 40-60%, the operation and investment cost of the equipment is saved, on the other hand, the problem of membrane pollution possibly caused by uneven aeration or hair accumulation at the root of membrane filaments and other factors is solved, the operation stability of the equipment is improved, on the one hand, an anoxic environment is created, the anaerobic treatment unit can be used as a post-anoxic treatment unit, the denitrification effect of a biochemical system is enhanced, and the effluent quality of the equipment is further improved.

The low-energy-consumption MBR process can perform periodic in-situ membrane cleaning through the reciprocating motion of the membrane module, desorbs the sludge adsorbed on the surface of the membrane wires through the mutual collision and friction between the membrane wires and the water body, reduces the use frequency and concentration of chemical liquid medicine, reduces the damage of the chemical liquid medicine to the state of the membrane wires, prolongs the service life of the membrane module and reduces the operation and maintenance cost of equipment; meanwhile, the resistance of water flowing through the membrane is reduced, the permeability of micropores on the surface of the membrane filaments is maintained, the MBR running flux is improved, and the running stability of equipment is enhanced.

Example 3: as shown in fig. 1 and 2, the integrated sewage treatment device and method, the low-energy MBR process and the in-situ membrane cleaning mode ensure high-efficiency, low-energy consumption and stable operation of the MBR integrated sewage treatment equipment.

One movable integrated sewage treatment device: an anoxic tank, an aerobic tank, a membrane tank and an equipment room which are sequentially arranged are separated by a partition plate in a box body structure, wherein the anoxic tank is communicated with the bottom of the aerobic tank, the aerobic tank is communicated with the top of the membrane tank, and the equipment room is close to the membrane tank; the box body adopts an integrated modular design, the production quality and the production period are controllable, the manufacturing cost is low, the structure is compact, the occupied area is small, the transportation and the maintenance are convenient, the full-automatic operation and the remote intelligent monitoring can be realized, and the device is suitable for treating the distributed village and town domestic sewage;

② a sewage treatment process: the ammonia nitrogen is converted into nitrate nitrogen through nitration reaction in an aerobic environment, and the nitrate nitrogen is converted into nitrogen through denitrification reaction in an anoxic environment, so that denitrification is realized; meanwhile, activated sludge is left in the system by utilizing the membrane separation performance of the MBR, so that the yield of excess sludge is reduced, the sludge treatment cost is saved, the high-concentration microbial biomass of the system is kept, the removal capacity of the system on ammonia nitrogen and organic matters is improved, the impact load resistance is strong, the effluent quality is good, and the process operation is stable;

and thirdly, low-energy consumption MBR process: the membrane group device is driven by the speed reducing motor to perform regular mechanical reciprocating motion, so that the membrane wires and the water body form relative motion, under the condition of low membrane surface current ratio, the phenomenon of concentration polarization of the membrane surface is effectively scrubbed and controlled by the action of inertia force, and the anti-pollution performance of the membrane wires is remarkably improved and enhanced; because the process is not provided with an aeration device and only carries out solid-liquid separation in a mechanical reciprocating motion mode, on one hand, the energy consumption is reduced by about 40-60%, the operation and investment cost of the equipment is saved, on the other hand, the problem of membrane pollution possibly caused by uneven aeration or hair accumulation at the root of membrane wires and other factors is solved, the operation stability of the equipment is improved, on the other hand, an anoxic environment is created and can be used as a post-anoxic treatment unit to strengthen the denitrification effect of a biochemical system and further improve the effluent quality of the equipment;

fourthly, in-situ membrane cleaning mode: the low-energy-consumption MBR process can perform periodic in-situ membrane cleaning through the reciprocating motion of the membrane module, desorbs the sludge adsorbed on the surface of the membrane wires through the mutual collision and friction between the membrane wires and the water body, reduces the use frequency and concentration of chemical liquid medicine, reduces the damage of the chemical liquid medicine to the state of the membrane wires, prolongs the service life of the membrane module and reduces the operation and maintenance cost of equipment; meanwhile, the resistance of water flowing through the membrane is reduced, the permeability of micropores on the surface of the membrane filaments is maintained, the MBR running flux is improved, and the running stability of equipment is enhanced.

Example 4: as shown in figures 1 and 2, the integrated sewage treatment equipment comprises an anoxic tank 33, an aerobic tank 32, a membrane tank 28 and an equipment room 13 which are sequentially arranged and separated by a partition plate in a box structure, wherein the anoxic tank 33 is communicated with the bottom of the aerobic tank 32, the aerobic tank 32 is communicated with the top of the membrane tank 28, and the equipment room 13 is close to the membrane tank 28.

The box body 5 is an anti-corrosion heat-preservation box body, the outer wall of the framework of the box body is of a Q235 steel contour plate structure, the strength is high, the service life is long, the splicing design can be carried out on each treatment unit according to the water quality, the emission requirement and the like, and the process selection is flexible.

Sewage to be treated sequentially passes through a first water inlet pipe 1, a first valve 2, a water inlet lifting pump 3 and a second water inlet pipe 4 and enters an anoxic tank 33 in a box body 5; the anoxic tank 33 comprises a pretreatment unit 6, a stirrer 7 and an anoxic biochemical region, wherein a basket grid is arranged in the pretreatment unit 6, sewage enters the basket grid through a second water inlet pipe 4, large particle substances such as hair and the like in the sewage are removed, the biochemical treatment load is effectively reduced, and the long-term normal operation of the system is guaranteed; after the preliminary filtration is finished, the sewage enters an anoxic biochemical area through an outlet of a grid of the basket, the nitrate nitrogen and part of COD (chemical oxygen demand) are removed by the organic matters in the sewage through denitrification, and the COD is used as an index for measuring the content of the organic matters in the water. The larger the chemical oxygen demand, the more serious the water body is polluted by organic matters. Further realizing the denitrification treatment of the system; the stirrer 7 is arranged in the anoxic biochemical area and is mainly used for stirring and mixing the primarily filtered sewage and the nitrifying liquid in the anoxic biochemical area, so that denitrifying bacteria, nitrate nitrogen and organic matters in the sewage in the nitrifying liquid are in close contact, and the biochemical treatment efficiency is improved.

The sewage treated by the anoxic biochemical region in the anoxic tank 33 enters the aerobic tank 32 through the communication part of the anoxic tank 33 and the bottom of the aerobic tank 32; the aerobic tank 32 is internally provided with the microporous aerators 29, the emptying unit and the reflux unit, wherein the microporous aerators 29 are arranged at the bottom of the aerobic tank 32 in an array manner, one end of each microporous aerator is connected with the air blower 15 through the aeration pipeline 16 and the third valve 19 and used for providing air for the aerobic tank 32 so as to ensure that the dissolved oxygen concentration of the sludge mixed liquor in the aerobic tank 32 is maintained at 1-2mg/L and the air distribution is uniform, thereby providing necessary oxygen for the growth and the propagation of microorganisms in the environment, improving the activity and the concentration of the microorganisms, being beneficial to the biochemical degradation of organic matters in sewage, providing a growth environment for aerobic nitrobacteria, being beneficial to removing ammonia nitrogen from the organic matters in the sewage through nitrification, providing more contact opportunities for nitrobacteria in the nitrifying liquid and the organic matters in the sewage, and improving the biochemical treatment efficiency; a third valve 19 arranged between the blower 15 and the microporous aerator 29 can adjust the air inflow of the aerobic tank 32; the emptying unit is arranged at the lower part of the microporous aerator 29 and comprises a seventh valve 31 and a second emptying pipe 30, and the second emptying pipe 30 is arranged at the bottom of the microporous aerator 29 and is used for discharging sludge deposited at the bottom of the aerobic tank 32 and the like; the reflux unit is arranged at the upper part of the aerobic tank 32 and comprises a second valve 10, a nitrifying liquid reflux pump 9 and a nitrifying liquid reflux pipe 8, and is used for partially refluxing the nitrifying liquid in the aerobic tank 32 to the anoxic tank 33 so as to provide more nitrate nitrogen for the organic matters in the sewage for denitrification.

The sewage after biochemical treatment in the aerobic tank 32 enters the membrane tank 28 through the communication part of the aerobic tank 32 and the top of the membrane tank 28; the membrane pool 28 is internally provided with a low-energy-consumption membrane bioreactor, a reflux unit and an emptying unit, wherein the low-energy-consumption membrane bioreactor comprises a transmission mechanism 12, a sliding frame mechanism 11, a membrane group device 17 and a water collecting unit, the transmission mechanism 12 and the sliding frame mechanism 11 are arranged at the top of the box body 5, and the mechanical reciprocating motion of the membrane group device 17 in the horizontal direction is realized through the combined action of the transmission mechanism 12 and the sliding frame mechanism 11, so that membrane filaments and a water body form relative motion, under the condition of low membrane surface flow rate ratio, the membrane filament is effectively scrubbed and the membrane surface concentration polarization phenomenon is controlled by means of the action of inertia force, and the anti-; the water collecting unit consists of a second water outlet pipe 21, a fourth valve 20 and a water producing pump 18 and is used for collecting effluent subjected to deep filtration by the membrane group device 17, and sludge particles cannot permeate the microporous structure of the membrane surface and are trapped in the membrane tank 28, so that sludge-water separation is rapidly realized; the backflow unit is arranged at the lower part of the membrane group device 17, comprises a first sludge backflow pipe 24, a second sludge backflow pipe 25, a sixth valve 26 and a sludge backflow pump 27, and is used for returning the sludge concentrated solution in the membrane tank 28 to the aerobic tank 32, controlling the concentration of the sludge mixed solution in the aerobic tank 32 and ensuring the biochemical treatment efficiency of the sewage; the emptying unit is arranged at the lower part of the second sludge return pipe 25 and comprises a fifth valve 22 and a first emptying pipe 23, and the first emptying pipe is used for discharging residual sludge in the membrane tank 28 and ensuring the stable operation of the MBR process.

The low-energy-consumption membrane bioreactor adopted in the membrane tank 28 replaces an aeration device by the mechanical reciprocating motion of the membrane group device, and has the characteristics of three aspects: firstly, the energy consumption is reduced by about 40-60%, the operation and investment cost of the equipment is saved, secondly, the problem of membrane pollution possibly caused by factors such as uneven aeration or hair accumulation at the root of membrane filaments is solved, the operation stability of the equipment is improved, thirdly, an anoxic environment is created, the anaerobic treatment unit can be used as a post-anoxic treatment unit, the denitrification effect of a biochemical system is strengthened, and the effluent quality of the equipment is further improved.

The integrated equipment is a skid-mounted structure integrated as a whole in the equipment room 13 and comprises an air blower 15, a water producing pump 18, an automatic control module, a membrane cleaning module, a dosing module, an instrument module and an ultraviolet disinfection module, and the control device comprises the automatic control module, the membrane cleaning module, the dosing module, the instrument module and the ultraviolet disinfection module.

The air blower 15 is used for providing air for the aerobic tank 32, the water production pump 18 is used for sucking out water through the negative pressure of the membrane group device 17, the water which is deeply filtered in the membrane tank 28 is subjected to ultraviolet disinfection and is discharged or recycled through the first water outlet pipe 14, and the control device is used for stably operating the low-energy MBR integrated equipment.

The low-energy-consumption membrane bioreactor comprises a transmission motor 34, a sliding frame 35, a track 36, a rolling wheel 37 and a membrane group device 17, wherein the rolling wheel 37 is arranged on the upper part of the track 36, and the sliding frame 35 is arranged on the upper part of the rolling wheel 37, so that the movement stability of the sliding frame 35 and the running reliability of equipment are ensured; the membrane group device 17 is supported by the sliding frame 35, the membrane group device 17 is driven by the rail 36, the rolling wheel 37 and the transmission motor 34 to perform regular horizontal reciprocating motion, so that the membrane wires and the water body form relative motion, under the condition of low membrane surface flow velocity ratio, the membrane surface concentration polarization phenomenon is effectively scrubbed and controlled by means of the action of inertia force, and the anti-pollution performance of the membrane wires is remarkably improved and enhanced; the low-energy-consumption membrane bioreactor performs solid-liquid separation in a mechanical reciprocating motion mode, reduces the energy consumption by about 40-60%, saves the operation and investment cost of equipment, solves the problem of membrane pollution possibly caused by factors such as uneven aeration or hair accumulation at the root of membrane filaments and the like, improves the operation stability of the equipment, creates an anoxic environment, enables a membrane pool to be used as a post-anoxic treatment unit to strengthen the denitrification effect of a biochemical system, and further improves the effluent quality of the equipment; the number of the membrane group devices 17 can be reasonably designed and flexibly managed according to the requirements of water quality and water quantity.

In addition, the low-energy-consumption membrane bioreactor can perform periodic in-situ membrane cleaning through the reciprocating motion of the membrane group device 17, and desorbs the sludge adsorbed on the surface of the membrane filaments through the mutual collision and friction between the membrane filaments and the water body, so that the use frequency and the concentration of chemical liquid medicine are reduced, the damage of the chemical liquid medicine to the state of the membrane filaments is reduced, the service life of the membrane group device is prolonged, and the operation and maintenance cost of equipment is reduced; meanwhile, the resistance of water flowing through the membrane is reduced, the permeability of micropores on the surface of the membrane filaments is kept, the running flux of the membrane module device 17 is improved, and the running stability of the equipment is enhanced.

As described above, although the embodiments of the present invention have been described in detail, it will be apparent to those skilled in the art that many modifications are possible without substantially departing from the spirit and scope of the present invention. Therefore, such modifications are also all included in the scope of protection of the present invention.

Claims

1. The integrated sewage treatment device is characterized in that an anoxic tank, an aerobic tank, a membrane tank and an equipment room which are sequentially arranged are separated by a partition plate in a box body, wherein the anoxic tank is communicated with the bottom of the aerobic tank, the aerobic tank is communicated with the top of the membrane tank, and the equipment room is connected with the membrane tank; the outer wall of a framework of the box body is of a steel contour plate structure, the anoxic tank is connected with the pretreatment unit, the stirrer and the anoxic biochemical area, the first water inlet pipe is connected with the first valve, the other end of the first valve is connected with the water inlet lifting pump, the other end of the water inlet lifting pump is connected with the second water inlet pipe, the other end of the second water inlet pipe is communicated with the pretreatment unit of the anoxic tank, a basket grid is arranged in the pretreatment unit, the aerobic tank is connected with the micropore aerators, the emptying units and the reflux units, the micropore aerators are arranged at the bottom of the aerobic tank in an array manner, one ends of the micropore aerators are connected with the air blower through aeration pipelines and third valves, the third valve is connected between the air blower and the micropore aerators, the emptying units are arranged at the lower parts of the micropore aerators, the second emptying pipe is connected; the reflux unit is arranged on the upper part of the aerobic tank, the reflux unit comprises a second valve, a nitrifying liquid reflux pump and a nitrifying liquid reflux pipe, one end of the second valve is connected with the aerobic tank, the other end of the second valve is connected with the nitrifying liquid reflux pump, the other end of the nitrifying liquid reflux pipe is connected with the nitrifying liquid reflux pipe, the other end of the nitrifying liquid reflux pipe is connected with the anoxic tank, the aerobic tank is communicated with the top of the membrane tank, a low-energy-consumption membrane bioreactor, a reflux unit and an emptying unit are arranged in the membrane tank, the low-energy-consumption membrane bioreactor comprises a transmission mechanism, a carriage mechanism, a membrane module and a water collection unit, the transmission mechanism and the carriage mechanism are arranged on the top of the tank body, the transmission mechanism is connected with the carriage mechanism, the membrane module can mechanically reciprocate in the horizontal direction, the water collection unit comprises a second water outlet pipe, a fourth valve and a water production, the other end of fourth valve is connected and is produced the water pump, produce the other end of water pump and connect first outlet pipe, the membrane group ware lower part is arranged in to the backward flow unit, the backward flow unit includes first mud back flow, second mud back flow, the sixth valve, the mud backwash pump, the second mud back flow is placed in membrane group ware lower part, the second mud back flow is connected with first mud back flow, the sixth valve is connected to the other end of first mud back flow, the mud backwash pump is connected to the other end of sixth valve, good oxygen pond is connected to the other end of mud backwash pump, the evacuation unit is arranged in second mud back flow lower part, including fifth valve and first evacuation pipe, the one end of first evacuation pipe and the bottom intercommunication in membrane pond, the fifth valve is connected to the other end of first evacuation pipe.

2. The integrated sewage treatment device according to claim 1, wherein the transmission mechanism comprises a transmission motor, the carriage mechanism comprises a carriage, a rail and a rolling wheel, the rolling wheel is arranged on the upper part of the rail, and the carriage is arranged on the upper part of the rolling wheel; the film assembly device is supported by the sliding frame, the film assembly device is driven to perform regular horizontal reciprocating motion by the rail, the rolling wheel and the transmission motor, the connection relation among the rail, the rolling wheel, the transmission motor and the film assembly device provides output power for the transmission motor, and the sliding frame supports the film assembly device, and the rail, the rolling wheel and the transmission motor drive the film assembly device to perform mechanical reciprocating motion; the transmission motor is arranged on the upper portion of the membrane pool and fixed at the top of the box body, the output arm is connected with the sliding frame, the sliding frame is arranged on the track, the upper portion of the cross beams on the two sides of the sliding frame supports the membrane module device, the bottom of the cross beams on the two sides of the sliding frame is provided with a plurality of rolling wheels, and the rolling wheels horizontally reciprocate on the track and further drive the membrane module device to horizontally reciprocate mechanically.

3. The integrated sewage treatment method is characterized by comprising the following steps;

4. The integrated sewage treatment method of the integrated sewage treatment apparatus according to claim 1, characterized in that: sewage to be treated sequentially passes through a first water inlet pipe, a first valve, a water inlet lifting pump and a second water inlet pipe and enters an anoxic tank in the box body; the anoxic tank comprises a pretreatment unit, a stirrer and an anoxic biochemical region, wherein a basket grid is arranged in the pretreatment unit, sewage enters the basket grid through a second water inlet pipe, large hair particle substances in the sewage are removed, the biochemical treatment load is effectively reduced, and the long-term normal operation of the system is guaranteed; after the primary filtration is finished, the sewage enters an anoxic biochemical area through an outlet of a basket grid, and organic matters in the sewage are subjected to denitrification to remove nitrate nitrogen and part of Chemical Oxygen Demand (COD), so that the denitrification treatment of the system is realized; the stirrer is arranged in the anoxic biochemical area and is mainly used for stirring and mixing the primarily filtered sewage and the nitrifying liquid in the anoxic biochemical area, so that denitrifying bacteria, nitrate nitrogen and organic matters in the sewage in the nitrifying liquid are in close contact, and the biochemical treatment efficiency is improved.

5. The integrated sewage treatment method according to claim 4, wherein the sewage treated by the anoxic biochemical region in the anoxic tank enters the aerobic tank through a communication part between the anoxic tank and the bottom of the aerobic tank; the aerobic tank is internally provided with a microporous aerator, an emptying unit and a backflow unit, wherein the microporous aerator is arranged at the bottom of the aerobic tank in an array manner, one end of the microporous aerator is connected with an air blower through an aeration pipeline and a third valve and is used for providing air for the aerobic tank, so that the dissolved oxygen concentration of sludge mixed liquor in the aerobic tank is maintained at 1-2mg/L, the air distribution is uniform, necessary oxygen is provided for the growth and the propagation of microorganisms in the environment, the activity and the concentration of the microorganisms are improved, the biochemical degradation of organic matters in sewage is facilitated, the growth environment is provided for aerobic nitrifying bacteria, the ammonia nitrogen is removed from the organic matters in the sewage through nitrification, more contact opportunities are provided for nitrifying bacteria in nitrifying liquid and the organic matters in the sewage, and the biochemical treatment; a third valve is arranged between the blower and the microporous aerator and used for adjusting the air inflow of the aerobic tank; the emptying unit is arranged at the lower part of the microporous aerator and comprises a seventh valve and a second emptying pipe, and the second emptying pipe is arranged at the bottom of the microporous aerator and is used for discharging sludge deposited at the bottom of the aerobic tank; the reflux unit is arranged at the upper part of the aerobic tank, comprises a second valve, a nitrifying liquid reflux pump and a nitrifying liquid reflux pipe and is used for partially refluxing the nitrifying liquid in the aerobic tank into the anoxic tank so as to provide more nitrate nitrogen for the organic matters in the sewage for denitrification.

6. The integrated sewage treatment method according to claim 4, wherein the sewage after the biochemical treatment in the aerobic tank enters the membrane tank through a communication part between the aerobic tank and the top of the membrane tank; the membrane pool is internally provided with a low-energy-consumption membrane bioreactor, a reflux unit and an emptying unit, wherein the low-energy-consumption membrane bioreactor comprises a transmission mechanism, a sliding frame mechanism, a membrane group device and a water collecting unit, the transmission mechanism and the sliding frame mechanism are arranged at the top of the box body, and the mechanical reciprocating motion of the membrane group device in the horizontal direction is realized through the combined action of the transmission mechanism and the sliding frame mechanism, so that membrane wires and a water body form relative motion, under the condition of low membrane surface flow rate ratio, the membrane surface concentration polarization phenomenon is effectively scrubbed and controlled by means of the action of inertia force, and the anti-pollution performance of the membrane wires; the water collection unit consists of a second water outlet pipe, a fourth valve and a water production pump and is used for collecting effluent after deep filtration by the membrane group device, and sludge particles cannot permeate the microporous structure of the membrane surface and are trapped in the membrane tank, so that sludge and water separation is quickly realized; the backflow unit is arranged at the lower part of the membrane group device and comprises a first sludge backflow pipe, a second sludge backflow pipe, a sixth valve and a sludge backflow pump, and the backflow unit is used for returning the sludge concentrated solution in the membrane tank to the aerobic tank, controlling the concentration of the sludge mixed solution in the aerobic tank and ensuring the biochemical treatment efficiency of sewage; the emptying unit is arranged at the lower part of the second sludge return pipe and comprises a fifth valve and a first emptying pipe, and the first emptying pipe is used for discharging residual sludge in the membrane tank and ensuring the stable operation of an MBR process.

7. The integrated sewage treatment method according to claim 4, wherein the membrane group device is driven by the rail, the rolling wheel and the transmission motor to perform regular horizontal reciprocating motion, so that the membrane wires and the water body form relative motion, under the condition of low membrane surface flow velocity ratio, the membrane surface concentration polarization phenomenon is effectively scrubbed and controlled by means of the action of inertia force, and the anti-pollution performance of the membrane wires is improved and enhanced; the low-energy-consumption membrane bioreactor performs solid-liquid separation in a mechanical reciprocating mode; the low-energy-consumption membrane bioreactor carries out periodic in-situ membrane cleaning through the reciprocating motion of the membrane group device, and the sludge adsorbed on the surface of the membrane filaments is desorbed through the mutual collision and friction between the membrane filaments and the water body.