Intermittent aeration system of membrane bioreactor and control method of intermittent aeration system

Abstract

The present application relates to an intermittent aeration system of a membrane bioreactor and a control method of the intermittent aeration system, which belongs to the technical field of sewage treatment. The system is applied to a membrane bioreactor system, wherein a gallery is arranged in the membrane bioreactor system, wherein at least one MBR membrane module is arranged in the gallery, wherein the water outlet of each MBR membrane module is connected to one end of a water pipe located in the gallery, and a water pump and a first valve are arranged on the other end of the water pipe; the intermittent aeration system comprises an aeration pipe, a fan unit and a main control module; one end of the aeration pipe is connected to the purge outlet of each MBR membrane module, and a main pipe and a branch pipe are arranged in parallel near one end of the MBR membrane module, and a control valve is arranged on the main pipe and the branch pipe; the other end of the aeration pipe is connected to the air outlet of the fan unit; the main control module is electrically connected to the water pump, the first valve and the control valve, and the main control module realizes intermittent conduction of the main pipe and the branch pipe by controlling the control valve. The present application has the effect of reducing aeration energy consumption and improving endogenous denitrification capacity.

Description

Technical Field

[0001] The present application relates to the technical field of sewage treatment, and in particular to an intermittent aeration system of a membrane bioreactor and a control method of the intermittent aeration system. Background Art

[0002] The membrane bioreactor (MBR) process is an advanced sewage treatment technology. Due to its excellent solid-liquid separation effect and stable sewage treatment performance, this process is widely praised and used in the fields of municipal domestic sewage and various industrial wastewater treatment.

[0003] The current MBR process has the problem of membrane fouling. The development and change process of membrane fouling mainly has the following three stages: in the initial stage, due to the concentration polarization effect in the sewage, pollutants such as particulate matter and macromolecular organic matter gradually deposit on the membrane surface, and at the same time, some soluble small molecular pollutants will be adsorbed in the membrane pores; in the development stage, as a large amount of soluble substances adhere to the membrane surface, larger particulate pollutants gradually form and deposit on the membrane surface, and finally form a filter cake layer, which reduces the membrane flux and slowly increases the transmembrane pressure (transmembrane pressure, TMP); in the leap stage, as pollutants continue to deposit on the membrane surface, the thickness of the filter cake layer continues to increase and is further compacted, causing a sudden increase in TMP. In other words, membrane fouling will bring about problems such as decreased membrane flux, poor water treatment effect, and reduced membrane service life, thereby increasing the operating energy consumption and maintenance costs of the devices involved in the MBR process.

[0004] In order to control membrane fouling, the usual practice is to aerate the bottom of the membrane pool, such as using a continuous aeration device or a pulse aeration device to generate a gas-liquid mixed flow, and using the disturbance of the gas-liquid mixed flow to control the deposition of pollutants on the membrane surface. Specifically, the continuous aeration device needs to release gas continuously, while the pulse aeration device uses a special pulse purge device to achieve intermittent aeration of a single aeration box. The pulse aeration device is used to release aeration for a short time, and the instantaneous aeration intensity is 5 to 10 times higher than that of the continuous aeration device. However, whether it is a continuous aeration device or a pulse aeration device, there will be the following problems: 1. The sludge in the MBR pool is continuously sheared, resulting in the breakage of the sludge flocs and the generation of a large number of small particles of colloids and soluble substances. These substances are easily adsorbed in the membrane pores, causing more serious membrane fouling;

[0005] 2. The dissolved oxygen in the MBR pool is usually above 6 mg / L. If it is directly returned to the anaerobic pool or anoxic pool, a large amount of dissolved oxygen will be introduced, destroying the anaerobic and anoxic environment and losing the denitrification and phosphorus removal functions;

[0006] 3. Multiple membrane groups in the MBR pool are aerated simultaneously, and the fans equipped have high air volume, high energy consumption, and large investment.

[0007] Therefore, the current membrane fouling control technology has the problems of high aeration energy consumption and low endogenous nitrogen removal capacity, and a new membrane fouling control technology is urgently needed. Summary of the invention

[0008] In order to solve the problems of high aeration energy consumption and low endogenous nitrogen removal capacity of a membrane bioreactor system, the present application provides an intermittent aeration system of a membrane bioreactor and a control method of the intermittent aeration system.

[0009] In the first aspect of the present application, an intermittent aeration system for a membrane bioreactor is provided. The system is applied to a membrane bioreactor system, wherein the membrane bioreactor system comprises at least one gallery, wherein at least one set of MBR membrane modules are arranged in the gallery, wherein the water outlets of the MBR membrane modules are connected to one end of a water pipe in the gallery, and a water pump and a first valve are arranged at the other end of the water pipe; the intermittent aeration system comprises an aeration pipe, a fan unit and a main control module;

[0010] One end of the aeration pipe is connected to the purge port of each set of MBR membrane modules, and a main pipe and a branch pipe are arranged in parallel at one end of the aeration pipe close to the MBR membrane module, and control valves are arranged on both the main pipe and the branch pipe, and the diameter of the main pipe is larger than the diameter of the branch pipe; the other end of the aeration pipe is arranged outside the corridor and communicated with the air outlet of the fan unit;

[0011] The main control module is electrically connected to the water pump, the first valve and the control valve respectively, and the main control module controls the control valve to intermittently conduct the main pipe and the branch pipe.

[0012] By adopting the above technical scheme, in the initial stage of membrane pollution, the main control module controls the intermittent aeration of the branch pipe, which can effectively remove the pollutants on the membrane surface and achieve the purpose of effectively treating membrane pollution; after a long initial stage, in the process of moving towards the development stage, the main control module controls the main pipe for long-term and high-intensity aeration to minimize the accumulated membrane pollution and alleviate the rapid rise of membrane pollution, so that while the MBR membrane group maintains long-term intermittent aeration, the energy consumption of the membrane biological reaction system is more energy-saving than that of the conventional MBR system. Moreover, in the conventional MBR system, several MBR membrane groups are aerated at the same time, and the required air volume is large, and the fan configuration is high and the investment is large. However, in the intermittent aeration system of the present application, the required total air volume is low compared with the original fan air volume, and the total purge system investment is small. In addition, the long-term intermittent aeration state of the membrane biological reaction system keeps the dissolved oxygen at about 0 to 0.8, so that the membrane biological reaction system is in anoxic state for a long time, so that the sludge does not destroy the anaerobic and anoxic environment when it flows back to the front end, and the anoxic environment can also be used to improve the endogenous denitrification capacity.

[0013] In a possible implementation, when there are a plurality of aeration pipes, one end of the plurality of aeration pipes disposed outside the corridor is connected to an air outlet of the fan unit.

[0014] By adopting the above technical solution, multiple aeration pipes are provided with air volume by a set of fan units, so in the intermittent aeration system of the present application, the required total air volume is 30-50% of the original, the fan air volume is low, and the total purge system investment is small.

[0015] In a possible implementation, the control valves arranged on the main pipe and the branch pipe are pneumatic valves or electric valves.

[0016] By adopting the above technical solution, the control valves arranged on the main pipe and the branch pipe are pneumatic valves or electric valves, so that the main control module can perform unified control.

[0017] In a second aspect of the present application, a method for controlling an intermittent aeration system of a membrane bioreactor is provided. The method is applied to an intermittent aeration system of any of the above-mentioned membrane bioreactors, and the method comprises:

[0018] Determine a water production cycle of a water production system, wherein the water production cycle includes a water production time period and a stop time period, and the water production system includes a water pipe and a water pump and a first valve arranged on the water pipe;

[0019] Determine the operation cycle of the intermittent aeration system according to the water production cycle of the water production system, wherein the operation cycle includes a small operation cycle and a large operation cycle, wherein the small operation cycle is the aeration cycle of the branch pipe, and the large operation cycle is the aeration cycle of the main pipe;

[0020] A management and control strategy is generated according to the operation cycle of the intermittent aeration system.

[0021] By adopting the above technical scheme, the initial stage of membrane pollution and the process of continuous development from the initial stage to the development stage are determined according to the water production cycle of the water production system, so as to facilitate the adoption of different management and control strategies at different stages to remove pollutants on the membrane surface in a targeted manner and achieve the purpose of effectively treating membrane pollution.

[0022] In a possible implementation, when the operation cycle is a small operation cycle, determining the operation cycle of the intermittent aeration system according to the water production cycle of the water production system includes:

[0023] The small operation cycle is a time period between a first preset moment in a previous water production time period and a second preset moment in a next water production time period.

[0024] By adopting the above technical solution, the present application takes the time period between any two adjacent water production cycles of the water production system as a small operating cycle. At this time, the MBR membrane module is in a relatively relaxed state most of the time, so the main control module uses branch pipes for aeration during this time period, which can effectively remove pollutants on the membrane surface.

[0025] In a possible implementation, when the operation cycle is a large operation cycle, determining the operation cycle of the intermittent aeration system according to the water production cycle of the water production system includes:

[0026] When the water production time period of the water production system accumulates to 8 to 12 hours, the preset time period is the large operation cycle.

[0027] In a possible implementation manner: the preset time period is 20 to 30 minutes.

[0028] By adopting the above technical solution, this application uses the water production time period of the water production system accumulating to 8 to 12 hours as the initial stage and continuously develops towards the development stage. At this time, the main control module uses the main pipe to perform long-term, high-intensity aeration to minimize the accumulated membrane pollution and prevent further accumulation of membrane pollution.

[0029] In summary, the present application includes the following beneficial technical effects:

[0030] During the time period of the water production system 2 across the water production cycle, the main control module controls the control valve on the branch pipe to open and continuously aerate, which can effectively remove pollutants on the membrane surface and achieve the purpose of effectively treating membrane pollution. After the water production time period of the water production system accumulates to 8 to 12 hours, the main pipe is used for long-term, high-intensity aeration to minimize the accumulated membrane pollution and prevent the membrane pollution from further superposition. Moreover, while maintaining long-term intermittent aeration, energy consumption can be saved by 50 to 60% compared with conventional aeration systems. In conventional membrane biological reaction systems, aeration of multiple MBR membrane modules at the same time requires a large amount of air volume, and the fan configuration required is high and the investment is large. In the membrane biological reaction system of the present application, the total air volume required is 30% to 50% of the original, the fan cost is low, and the total purge system investment is small. In addition, during the long-term intermittent aeration process, the dissolved oxygen in the membrane bioreactor system is about 0-0.8 mg / L, which keeps the membrane bioreactor system in an anoxic state for a long time. When the sewage flows back to the front end, it does not destroy the anaerobic and anoxic environment. The anoxic environment can also be used to improve the endogenous nitrogen removal capacity, thereby achieving the purpose of reducing aeration energy consumption and improving endogenous nitrogen removal capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of an exemplary operating environment of an embodiment of the present application.

[0032] Figure 2It is a flow chart of a method for controlling an intermittent aeration system of a membrane bioreactor according to an embodiment of the present application.

[0033] Figure 3 It is an example diagram of the operation cycle within a single corridor in the embodiment of the method of the present application.

[0034] Figure 4 This is an example diagram of the mutual influence of multiple small operation cycles when the water production cycle is 8 minutes in the embodiment of the method of the present application.

[0035] Figure 5 This is an example diagram of the mutual influence of multiple small operation cycles when the water production cycle is 12 minutes in the embodiment of the method of the present application.

[0036] Explanation of the reference numerals: 1. Membrane biological reactor system; 2. Water production system; 21. Water pipe; 22. Water pump; 23. First valve; 3. MBR membrane module; 4. Intermittent aeration system; 41. Aeration pipe; 411. Main pipe; 412. Second valve; 413. Branch pipe; 414. Third valve; 42. Fan unit; 43. Main control module. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0038] Figure 1 A schematic diagram of an exemplary operating environment in which the embodiments of the present application can be implemented is shown, and the operating environment is a membrane biological reaction system 1, and the membrane biological reaction system 1 includes a water production system 2, an MBR membrane module 3 and an intermittent aeration system 4. The water production system 2 is used to perform negative pressure suction on the inner cavity of the MBR membrane module 3 to achieve the effect of separating water from sludge. The MBR membrane module 3 is used for mud and water separation, and the intermittent aeration system 4 can not only be used for mud and water oscillation around the MBR membrane module 3 to keep the membrane surface clean, but also provide oxygen required for biodegradation.

[0039] Specifically, the membrane biological reactor system 1 is provided with at least one corridor, in which at least one set of independent MBR membrane modules 3 is arranged, and the MBR membrane modules 3 are used to separate mud and water in the corridor.

[0040] The water production system 2 includes a water pipe 21 and a water pump 22 and a first valve 23 arranged on the water pipe 21. The first valve 23 can be a pneumatic valve or an electric valve.

[0041] The intermittent aeration system 4 includes an aeration pipe 41, a fan unit 42 and a main control module 43. One end of the aeration pipe 41 is connected to the purge port of the MBR membrane module 3 located in the same corridor, and a main pipe 411 and a branch pipe 413 are arranged in parallel at one end of the aeration pipe 41 close to the MBR membrane module 3; the diameter of the main pipe 411 is larger than the diameter of the branch pipe 413. In order to control the intermittent conduction of the main pipe 411 and the branch pipe 413 respectively, a second valve 412 is arranged on the main pipe 411, and a third valve 414 is arranged on the branch pipe 413. The second valve 412 and the third valve 414 can also be pneumatic valves or electric valves, which are not limited here. The other end of the aeration pipe 41 is arranged outside the corridor and is connected to the air outlet of the fan unit 42. The fan unit 42 provides wind power to the MBR pool through the aeration pipe 41 to generate a gas-liquid mixed flow for disturbing membrane pollution.

[0042] It should be noted that one aeration pipe 41 is correspondingly arranged in one corridor, and in this example, multiple corridors are arranged, so the intermittent aeration system 4 includes multiple aeration pipes 41, and one end of each aeration pipe 41 arranged outside the corridor is connected to the air outlet of the fan unit 42, that is, the fan unit 42 provides the multiple aeration pipes 41 with the air volume required for the corridor.

[0043] The main control module 43 is electrically connected to the water pump 22, the first valve 23, the second valve 412 and the third valve 414 respectively. Figure 1 The main control module 43 is used to control the water pump 22 , the first valve 23 , the second valve 412 and the third valve 414 .

[0044] In order to illustrate the process of the intermittent aeration system 4 providing aeration for the MBR membrane group 3, the present application proposes a control method for the intermittent aeration system of the membrane bioreactor, which is applied to the above-mentioned main control module 43. Figure 2 As shown, the main processes of the control method are described as follows.

[0045] Step S1, determining the water production cycle of the water production system 2, where the water production cycle includes a water production time period and a stop time period.

[0046] In order to enable the MBR membrane unit 3 to perform stable filtration and achieve membrane surface cleaning, a stop time should be set between suction and pumping.

[0047] The water production cycle of the water production system 2 consists of a water production time period and a stop time period, which are represented by n1 and n2 respectively. Therefore, the ratio of the water production time period to the stop time period in a single water production cycle is n1:n2.

[0048] Step S2, determining the operation cycle of the intermittent aeration system 4 according to the water production cycle of the water production system 2, the operation cycle includes a small operation cycle and a large operation cycle, the small operation cycle is the aeration cycle of the branch pipe 413, and the large operation cycle is the aeration cycle of the main pipe 411.

[0049] For the intermittent aeration system 4 in a single corridor:

[0050] The small operation cycle depends on the water production cycle of the water production system 2, specifically, the time period from the first preset moment in the previous water production time period to the second preset moment in the next water production time period. The first preset moment is usually close to the end of the previous water production time period, and the second preset moment is usually close to the front of the next water production time period. In this example, the first preset moment is within the last 0.5 to 1 minute of the previous water production time period, and the second preset moment is within the first 1 to 2 minutes of the next water production time period. For the sake of convenience, for example Figure 3 As shown: the first preset moment of the small operation cycle is located in the previous water production time period, and the other end spans the stop time period that constitutes a water production cycle with the water production time period to the second preset moment of the next water production time period, so the small operation cycle is greater than the stop time period.

[0051] The large operation cycle also depends on the water production time period of the water production system 2. When the water production time period of the water production system 2 accumulates to 8 to 12 hours, the preset time period is the large operation cycle. The preset time period in this example is 20 to 30 minutes. That is to say, when the water production time period of the water production system 2 accumulates to 8 to 12 hours, the water pump 22 is turned off and the first valve 23 and the third valve 414 are disconnected, and the second valve 412 is opened. The main pipe 411 provides high-intensity wind for the corridor and lasts for 20 to 30 minutes. The 20 to 30 minutes is the large operation cycle. Figure 3 In the example, after the water production time period accumulates for a certain period of time, a large operation cycle will occur.

[0052] For the intermittent aeration system 4 in multiple galleries:

[0053] The small operation cycles affect each other. First, multiple corridors are sorted, and they can be sorted from left to right or from right to left. Then, in any two adjacent corridors, the small operation cycle corresponding to the corridor in the first order is connected with the small operation cycle corresponding to the corridor in the second order. For the sake of explanation, for example Figure 4 As shown:

[0054] When the water production cycle of water production system 2 is 8 minutes, of which the water production time period is 7 minutes and the stop time period is 1 minute, then: the first corridor 0-8min is the water production cycle, 0-7min is the water production time period, 7-8min is the stop time period, and the corresponding small operation cycle is 1min from the end of the previous water production cycle to the first 1min of the next water production cycle, that is, the small operation cycle obtained is 6min-9min, and so on to obtain the small operation cycle in the first corridor in the entire water production cycle;

[0055] The second corridor has a water production time period of 3-10 minutes and a stop time period of 10-11 minutes. The corresponding small operation cycle is from 2 minutes at the end of the previous water production cycle to the first 5 minutes of the subsequent water production cycle, that is, the small operation cycle is 10 minutes to 13 minutes. The small operation cycle in the second corridor during the entire water production cycle can be obtained by analogy.

[0056] It can be seen that when the single water production cycle of the water production system 2 is 8 minutes, every two corridors share one PLC timing control within the water production cycle, that is, the short operation cycle corresponding to the 8-minute water production cycle is 3 minutes, saving about 60% of aeration energy consumption.

[0057] For further explanation, let’s take an example Figure 5 As shown:

[0058] When the water production cycle of the water production system is 12 minutes, of which the water production period is 9 minutes and the stop period is 3 minutes, then:

[0059] In the first corridor, 0-12min is the water production cycle, 0-9min is the water production time period, and 9-12min is the stop time period. The corresponding small operation cycle is 0.5min from the end of the previous water production cycle to the first 0.5min of the next water production cycle, that is, the small operation cycle is 8.5min-12.5min;

[0060] The second corridor has a water production cycle of 8-20 minutes, a water production time period of 8-17 minutes, and a stop time period of 17-20 minutes. The corresponding small operation cycle is from 4.5 minutes at the end of the previous water production cycle to 8.5 minutes at the beginning of the next water production cycle, that is, the small operation cycle is 16.5 minutes to 20.5 minutes.

[0061] The third corridor has a water production cycle of 4-16 minutes, a water production time period of 4-13 minutes, and a stop time period of 13-16 minutes. The corresponding small operation cycle is from 0.5 minutes at the end of the previous water production cycle to the first 4.5 minutes of the next water production cycle, that is, the obtained small operation cycle is 12.5 minutes to 26.5 minutes.

[0062] It can be seen that when the single water production cycle of the water production system 2 is 12 minutes, every three corridors share one PLC timing control within the water production cycle, that is, the short operation cycle corresponding to the 12-minute water production cycle is 4 minutes, saving about 65% of aeration energy consumption.

[0063] It should be noted that when the intermittent aeration systems 4 of multiple corridors are controlled at the same time, the large operation cycles do not affect each other, and the large operation cycle is only related to the water production time period of the water production system 2, that is, when the water production time period of the water production system 2 accumulates to 8 to 12 hours, it enters the large operation cycle.

[0064] Step S3: generating a control strategy according to the operation cycle of the intermittent aeration system 4.

[0065] After obtaining the small operating cycle and the large operating cycle, it is necessary to generate a specific management and control strategy based on the actual water production cycle of the water production system 2 in the corridor, that is, based on the correlation between the water production cycle and the small operating cycle and the large operating cycle, the actual small operating cycle and the actual large operating cycle are obtained under the actual water production cycle.

[0066] That is, according to the actual small operating cycle and the actual large operating cycle, the main control module 43 intelligently controls the start and stop of the water pump 22, the first valve 23, the second valve 412 and the third valve 414. For example, the water pump 22 and the first valve 23 are controlled to start during the water production time period, the third valve 414 is controlled to open during the small operating cycle, and the second valve 412 is controlled to open during the large operating cycle.

[0067] In summary, in the initial stage of membrane pollution, the main control module 43 controls the intermittent aeration of the branch pipe, which can effectively remove the pollutants on the membrane surface and achieve the purpose of effectively treating membrane pollution; after a long initial stage, in the process of moving towards the development stage, the main control module 43 controls the main pipe for long-term, high-intensity aeration to reduce the accumulated membrane pollution to a minimum, and alleviate the rapid rise of membrane pollution. While the MBR membrane group 3 maintains long-term intermittent aeration, the energy consumption can be saved by 50-60% compared with the conventional membrane biological reaction system 1. In the conventional membrane biological reaction system 1, several MBR membrane groups 3 are aerated at the same time, and the required air volume is large, and the fan configuration required is high and the investment is large. In the membrane biological reaction system 1 of the present application, the total air volume required is 30-50% of the original, the fan air volume is low, and the total purge system investment is small. The long-term intermittent aeration state makes the dissolved oxygen in the membrane bioreactor system 1 about 0-0.8, so that the membrane bioreactor system 1 is in anoxic state for a long time, so that the anaerobic and anoxic environment is not destroyed when the sludge is returned to the front end, and the anoxic environment can also be used to improve the endogenous denitrification capacity.

[0068] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of disclosure involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the aforementioned disclosed concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other to form a technical solution.

Claims

1. An intermittent aeration system for a membrane bioreactor, applied to a membrane bioreactor system (1), the membrane bioreactor system (1) comprising a water production system (2), an MBR membrane module (3) and an intermittent aeration system (4), the water production system (2) comprising a water pipe (21) and a water pump (22) and a first valve (23) arranged on the water pipe (21), the membrane bioreactor system (1) comprising at least one corridor, at least one set of MBR membrane modules (3) being arranged in the corridor, the water production ports of the MBR membrane modules (3) being connected to one end of the water pipe (21) in the corridor, the other end of the water pipe (21) being provided with a water pump (22) and a first valve (23); the intermittent aeration system (4) comprising an aeration pipe (41), a fan unit (42) and a main control module (43); One end of the aeration pipe (41) is connected to the purge port of each set of MBR membrane group (3), and a main pipe (411) and a branch pipe (413) are arranged in parallel at one end of the aeration pipe (41) close to the MBR membrane group (3), and both the main pipe (411) and the branch pipe (413) are provided with control valves, and the diameter of the main pipe (411) is larger than the diameter of the branch pipe (413); the other end of the aeration pipe (41) is arranged outside the corridor and is connected to the air outlet of the fan unit (42); The main control module (43) is electrically connected to the water pump (22), the first valve (23) and the control valve respectively, and the main control module (43) controls the control valve to intermittently conduct the main pipe (411) and the branch pipe (413); Determining an operation cycle of the intermittent aeration system (4) according to the water production cycle of the water production system (2), wherein the operation cycle includes a small operation cycle and a large operation cycle, wherein the small operation cycle is the aeration cycle of the branch pipe (413), and the large operation cycle is the aeration cycle of the main pipe (411); The small operation cycle is: the time period between the first preset time in the previous water production time period and the second preset time in the next water production time period; The first preset time is within the last 0.5 to 1 minute of the previous water production time period, and the second preset time is within the first 1 to 2 minutes of the next water production time period; When the water production time period of the water production system (2) accumulates to 8 to 12 hours, the preset time period is the large operation cycle; The maximum operation cycle is 20 to 30 minutes.

2. The intermittent aeration system of the membrane bioreactor according to claim 1, characterized in that: When there are a plurality of aeration pipes (41), one end of each of the aeration pipes (41) disposed outside the corridor is connected to an air outlet of the fan unit (42).

3. The intermittent aeration system of the membrane bioreactor according to claim 1, characterized in that: The control valves arranged on the main pipe (411) and the branch pipe (413) are pneumatic valves or electric valves.

4. A method for controlling an intermittent aeration system of a membrane bioreactor, applied to an intermittent aeration system (4) as claimed in any one of claims 1 to 3, characterized in that: include: Determining a water production cycle of a water production system (2), wherein the water production cycle includes a water production time period and a water stop time period, wherein the water production system (2) includes a water pipe (21) and a water pump (22) and a first valve (23) disposed on the water pipe (21); Determining an operation cycle of the intermittent aeration system (4) according to the water production cycle of the water production system (2), wherein the operation cycle includes a small operation cycle and a large operation cycle, wherein the small operation cycle is the aeration cycle of the branch pipe (413), and the large operation cycle is the aeration cycle of the main pipe (411); A management and control strategy is generated according to the operation cycle of the intermittent aeration system (4).

5. The method for controlling the intermittent aeration system of a membrane bioreactor according to claim 4, characterized in that: When the operation cycle is a short operation cycle, determining the operation cycle of the intermittent aeration system (4) according to the water production cycle of the water production system (2) comprises: The small operation cycle is a time period between a first preset moment in a previous water production time period and a second preset moment in a next water production time period.

6. The method for controlling the intermittent aeration system of a membrane bioreactor according to claim 4, characterized in that: When the operation cycle is a large operation cycle, determining the operation cycle of the intermittent aeration system (4) according to the water production cycle of the water production system (2) comprises: When the water production time period of the water production system (2) accumulates to 8 to 12 hours, the preset time period is the large operation cycle.

7. The method for controlling an intermittent aeration system of a membrane bioreactor according to claim 6, characterized in that: The maximum operation cycle is 20 to 30 minutes.

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