A MBR membrane module test device

Abstract

The present invention relates to an MBR membrane component test device, which is used for flux testing of MBR membrane components. It includes a main box body and a test control system installed in the main box body. It also includes a sewage pool, a clean water pool and a sewage overflow pool formed on the main box body for receiving external sewage, an MBR membrane component body fixed in the sewage pool, a water production system and a backwashing system respectively connected to the clean water pool and the two ends of the MBR membrane component body, and a water replenishment system respectively connected to the sewage pool and the sewage overflow pool. During the water production operation, the sewage in the sewage overflow pool is re-collected into the sewage pool through the water replenishment system. The water production, backwashing and water replenishment operations of the water production system, the backwashing system and the water replenishment system are all controlled by the test control system. The technical solution can accurately measure the attenuation rate of the flux of the MBR membrane component under long-term operation, and obtain accurate effective working time accordingly, and can prevent the effective working time of the MBR membrane component body from being reduced.

Description

Technical Field

[0001] The invention relates to the technical field of environmental protection, and more specifically to a MBR membrane component testing device. Background Art

[0002] MBR, also known as membrane bioreactor, is a new type of efficient sewage treatment equipment that organically combines membrane separation technology with traditional sewage biological treatment technology. The MBR process mainly uses membrane separation technology to intercept active bacteria and macromolecular organic matter in sewage, which can effectively achieve solid-liquid separation, greatly improve the effluent quality, and reduce the volume of the reactor. Among them, the MBR membrane component is the most critical component. When in use, it generates negative pressure inside so that water passes into the inner tube from the micropores on its surface, while the suspended matter in the sewage is blocked outside, achieving the purpose of filtration. Its main function is to intercept active bacteria, improve reactor efficiency, shorten reaction time and improve the quality of reaction effluent, and the effluent quality is high, and its application prospects are very broad.

[0003] During the research and development process, multiple MBR membrane components need to be tested repeatedly. This is because the filtration effects of MBR membrane components on different pollutants are different, and their filtration effects are closely related to the flux of the MBR membrane components. The attenuation change of the flux of the MBR membrane components determines its effective working time.

[0004] At present, after a certain test period of MBR membrane assembly, negative pressure will be generated in the inner tube of the MBR membrane assembly. The negative pressure will cause the suspended matter to adhere to the outer surface of the MBR membrane assembly, resulting in clogging of the outer surface micropores for water flow, which seriously shortens the effective working time of the MBR membrane assembly. In addition, during the test, due to the closed nature of the MBR membrane assembly, the user cannot know the specific flux of the MBR membrane assembly, that is, it is impossible to know whether the MBR membrane assembly has reached the effective working time. In this regard, the entire MBR membrane assembly is disassembled to measure the flux, but the number of MBR membrane assemblies used for the test is large, and it is very inconvenient to disassemble them one by one; or it is estimated based on the intuition and experience of the experimenter, which leads to extremely inaccurate test results, and it is impossible to correctly understand the accurate effective working time of the tested MBR membrane assembly. Summary of the invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present invention is to provide an MBR membrane component testing device which can accurately measure the attenuation rate of the MBR membrane component flux under long-term operation, thereby accurately obtaining the effective working time, and can prevent the effective working time from being reduced.

[0006] In order to achieve the above object, the technical solution of the present invention is:

[0007] A MBR membrane component test device is used for flux testing of MBR membrane components. It includes a main box body and a test control system installed in the main box body. It also includes a sewage pool, a clean water pool and a sewage overflow pool formed on the main box body for receiving external sewage, and a sewage pool for receiving excess sewage in the sewage pool. The MBR membrane component body fixed in the sewage pool is connected to a water production system and a backwashing system at both ends of the clean water pool and the MBR membrane component body, respectively, and a water replenishment system connected to the sewage pool and the sewage overflow pool, respectively. During water production operation, sewage in the sewage overflow pool is re-collected into the sewage pool through the water replenishment system. Water production, backwashing and water replenishment operations of the water production system, the backwashing system and the water replenishment system are all controlled by the test control system.

[0008] Preferably, the water production system includes a water production pipeline whose two ends are respectively connected to one end of the MBR membrane assembly body away from the backwash system and the clean water tank. A negative pressure mechanism, a water production normally open valve, a water production negative pressure gauge, a water production pump and a water production flow meter are sequentially provided on the water production pipeline. The water production negative pressure gauge and the water production flow meter are both fixed on the outer surface of the main box.

[0009] Preferably, a negative pressure sensor and a water production electronic flow meter are provided in sequence on the water production pipeline between the water production normally open valve and the water production pump, and both the negative pressure sensor and the water production electronic flow meter are electrically connected to the test control system.

[0010] Preferably, the backwash system includes a backwash pipeline whose two ends are respectively connected to one end of the MBR membrane assembly body away from the water production system and the clean water tank, and a backwash pump, a backwash positive pressure gauge, a backwash flow meter and a backwash normally closed valve are sequentially provided on the backwash pipeline, and the backwash positive pressure gauge and the backwash flow meter are both fixed on the outer surface of the main box body.

[0011] Preferably, a positive pressure sensor and a backwash electronic flow meter are provided in sequence on the backwash pipeline between the backwash pump and the backwash normally closed valve, and both the positive pressure sensor and the backwash electronic flow meter are electrically connected to the test control system.

[0012] Preferably, the water replenishment system includes a water replenishment pipeline with two ends respectively connected to the sewage overflow tank and the sewage tank, and a one-way valve and a reflux pump are connected to the water replenishment pipeline in sequence.

[0013] Preferably, an overflow groove is provided at the upper end of the side wall of the sewage pool close to the sewage overflow pool, and when the sewage level in the sewage pool reaches a certain height, it flows into the sewage overflow pool through the overflow groove.

[0014] Preferably, the sewage pool is also connected to an aeration system, which is controlled by a test control system. The aeration system includes an aeration pipe with two ends respectively connected to the sewage pool and an aeration pump. The aeration pipe is also connected to an air flow meter, which is fixed on the outer surface of the main box.

[0015] Preferably, an electronic air flow meter is provided on the aeration pipeline between the sewage tank and the air flow meter, and the electronic air flow meter is electrically connected to the test control system.

[0016] Preferably, the test control system controls the water production system to run for 8 minutes and stop for 2 minutes as a cycle, and the test control system controls the backwash system to run once every 1-2 hours.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] This technical solution can perfectly simulate the on-site working conditions and is suitable for repeated tests of multiple MBR membrane module bodies;

[0019] The MBR membrane module body cooperates with the water production system to produce water. The test control system that controls the water production system can obtain the real-time flux of the MBR membrane module body. According to the flux change trend of the MBR membrane module body during the water production operation, the attenuation rate of the flux of the tested MBR membrane module body is obtained, and the effective working time of the tested MBR membrane module body is obtained. During the whole process, there is no need for manual repeated disassembly monitoring and recording, which greatly saves the human resources required for the test and ensures the accuracy of the monitored MBR membrane module body flux and effective working time results;

[0020] Equipped with backwashing function, the backwashing system controlled by the test control system allows clean water to be pumped from the clean water tank into the inner tube of the MBR membrane module body during backwashing operation. As the clean water flow rate continues to increase, the water pressure in the inner tube of the MBR membrane module body increases, so that the clean water in the inner tube flows out from the micropores. When the clean water flows out, the suspended matter attached to the surface of the MBR membrane module body falls off, ensuring the fluidity of the MBR membrane module body, so that the MBR membrane module body can maintain a flux close to that during normal water production operation, thereby avoiding the reduction of the effective working time of the MBR membrane module body;

[0021] The water replenishment system controlled by the test control system can flow clean water from the overflow trough into the sewage overflow tank when the liquid level in the sewage tank rises to a certain height due to the flow of clean water from the micropores of the MBR membrane assembly body, and replenish the sewage in the sewage tank during water production operations, so that the sewage can be used more effectively.

[0022] The aeration system controlled by the test control system can perform aeration during water production operation. The specific aeration value can be set according to the square number of the tested MBR membrane component body to ensure that the aeration value is proportional to the water production per unit time of the tested MBR membrane component body, thereby ensuring that the water-gas ratio during water production operation meets the operation requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the overall structure of the present invention from another angle;

[0025] Figure 3 It is a schematic diagram of the enlarged structure of the A part of the present invention;

[0026] Figure 4 It is a schematic diagram of the enlarged structure of part B of the present invention;

[0027] Figure 5 It is a schematic diagram of the pipeline structure of the present invention.

[0028] As shown in the figure:

[0029] 1 Main box; 2 Sewage tank; 201 overflow tank; 3 Clean water tank; 4 Sewage overflow tank; 5 MBR membrane assembly body; 6 Water production pipeline; 7 Water production normally open valve; 8 Water production negative pressure gauge; 9 Water production pump; 10 Water production flow meter; 11 Negative pressure sensor; 12 Water production electronic flow meter; 13 Backwash pipeline; 14 Backwash pump; 15 Backwash positive pressure gauge; 16 Backwash flow meter; 17 Backwash normally closed valve; 18 Positive pressure sensor; 19 Backwash electronic flow meter; 20 Water supply pipeline; 21 Check valve; 22 Reflux pump; 23 Aeration pipeline; 24 Aeration pump; 25 Air flow meter; 26 Electronic air flow meter; 27 Test control system. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or the directions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of simplifying the description, and do not indicate or imply that the directions are specific directions that must be possessed, specific directions structures and operations, and therefore should not be understood as limitations on the present invention.

[0032] It should be mentioned that the test control system 27 mentioned below is a programmable logic controller (PLC for short). The PLC can store and execute operation instructions such as logical operations, sequential control, timing, counting and arithmetic operations, and control various types of mechanical equipment or production through digital or analog input and output. It has many advantages such as high reliability, strong anti-interference ability, small system design and construction workload, and convenient maintenance.

[0033] like Figure 1 , Figure 2 and Figure 4As shown, an MBR membrane component test device can mainly simulate field conditions and is used for flux testing of MBR membrane components. It includes a main box body 1 and a test control system 27 installed in the main box body 1. It also includes a sewage pool 2, a clean water pool 3 and a sewage overflow pool 4 formed on the main box body 1, wherein the sewage pool 2 is used to receive external sewage, that is, sewage to be treated, and the sewage to be treated is discharged into the clean water pool 3 after treatment, and the sewage overflow pool 4 is used to receive excess sewage to be treated in the sewage pool 2, and an MBR membrane component body 5 is fixed in the sewage pool 2;

[0034] The two ends of the MBR membrane module body 5 are respectively connected to the water production system and the backwash system. The sewage to be treated in the sewage pool 2 is treated by the MBR membrane module body 5 and the water production system, and the clean water obtained after the treatment is discharged into the clean water pool 3. After a long period of sewage treatment, the clean water in the clean water pool 3 is injected into the MBR membrane module body 5 by the backwash system and flows out from the micropores on the surface of the MBR membrane module body 5, so that the suspended matter attached to the surface of the MBR membrane module body 5 falls off, which greatly enhances the flux of the MBR membrane module body 5 and prevents the reduction of its effective working time;

[0035] It should be mentioned that the key part of the MBR membrane assembly body 5 is composed of a number of fiber membranes. The fiber membrane is tubular and has micropores on its surface that are connected to its inner tube. During operation, water can flow into the inner tube from the micropores, while the suspended matter in the sewage is isolated outside the hollow fiber membrane. The MBR membrane assembly body 5 is fixed by a membrane positioning plate arranged in the sewage pool 2 of the main box 1 when it is fixed, and the water production system and the backwashing system are indirectly connected to the MBR membrane assembly body 5 through the membrane positioning plate when it is set. The membrane positioning plate is distributed with through holes that are equal in number and correspond to the inner holes of the hollow fiber membrane, so as to facilitate the circulation of clean water during water production or backwashing. The above content is not the object of protection of this technical solution;

[0036] A water replenishment system is connected between the sewage pool 2 and the sewage overflow pool 4. During water production operations, the sewage in the sewage overflow pool 4 can be re-integrated into the sewage pool 2 through the water replenishment system. This arrangement allows for more effective use of sewage.

[0037] like Figure 1As shown, the test control system 27 is provided with programs for controlling the water production system, the backwash system and the water replenishment system respectively, so as to control the operation and operation duration of the water production, backwashing and water replenishment operations, and the control system can record and analyze the pressure and flow data during the water production operation and the backwashing operation, and obtain the real-time flux data and flux attenuation change of the MBR membrane component body 5, so as to timely and accurately determine the effective working time of the MBR membrane component body 5, avoiding the traditional method of estimating the effective working time of the MBR membrane component body 5 based on experience and intuition, resulting in extremely inaccurate test results and inability to correctly understand the accurate effective working time of the tested MBR membrane component.

[0038] like Figure 3 and Figure 5 As shown, further, the water production system includes a water production pipeline 6 whose two ends are respectively connected to one end of the MBR membrane assembly body 5 away from the backwash system and the clean water tank 3. The clean water obtained by the water production operation is discharged into the clean water tank 3 through the water production pipeline 6, and the water production pipeline 6 is sequentially provided with a negative pressure mechanism, a water production normally open valve 7, a water production negative pressure gauge 8, a water production pump 9 and a water production flow meter 10. In the above settings, the test control system 27 controls the operation of the negative pressure mechanism to form a negative pressure in the water production pipeline 6 and the inner tube of the MBR membrane assembly body 5. At this time, the external air pressure of the MBR membrane assembly body 5 is greater than the pressure in the inner tube of the MBR membrane assembly body 5, and water is pressed into the inner tube of the membrane from the micropores on the surface of the membrane to obtain clean water. , and the suspended matter is attached to the outer surface of the MBR membrane module body 5 due to its large volume and the negative pressure, so that the sewage is filtered and purified. The water production normally open valve 7 remains open during the water production operation, so that the clean water can smoothly pass through the water production pipeline 6 and is pumped into the clean water tank 3 by the water production pump 9. The water production negative pressure gauge 8 and the water production flow meter 10 are respectively used to monitor the negative pressure in the inner tube of the MBR membrane module body 5 and the water production pipeline 6 and the clean water flow pumped by the water production pump 9, and the water production negative pressure gauge 8 and the water production flow meter 10 are both fixed on the outer surface of the main box 1, so that the tester can intuitively understand the real-time water pressure and water flow during the test operation.

[0039] like Figure 3 and Figure 5As shown, further, a negative pressure sensor 11 and a water production electronic flowmeter 12 are sequentially provided on the water production pipeline 6 between the water production normally open valve 7 and the water production pump 9, and the negative pressure sensor 11 and the water production electronic flowmeter 12 are both electrically connected to the test control system 27. In the above settings, the negative pressure sensor 11 and the water production electronic flowmeter 12 are also used to monitor the negative pressure size and the clean water flow in the water production pipeline 6 and the inner tube of the MBR membrane assembly body 5, and are transmitted to the test control system 27 in the form of electrical signals for recording. The negative pressure mechanism is controlled according to the recorded data to ensure that the negative pressure is at a normal value required for the water production operation, and the real-time MBR membrane assembly body 5 flux of the water production operation can be automatically calculated according to the clean water flow data, and the attenuation rate of the flux of the tested MBR membrane assembly body 5 is obtained according to the flux change trend of the MBR membrane assembly body 5 during the water production operation, and the effective working time of the tested MBR membrane assembly body 5 is obtained. In the whole process, there is no need for manual repeated participation in disassembly, monitoring and recording, which greatly saves the human resources required for the test and ensures the accuracy of the monitoring results.

[0040] As mentioned above, since negative pressure is formed in the inner tube of the MBR membrane module body 5 during water production operation, when water enters the inner tube from the micropores on the outer surface of the MBR membrane module body 5, some suspended matter in the sewage cannot enter the micropores and adheres to the outer surface of the MBR membrane module body 5. In the case of long-term water production operation, the micropores are easily blocked, and water cannot enter the inner tube of the MBR membrane module body 5, thereby reducing the flux of the MBR membrane module body 5 and affecting the effective operation time of the MBR membrane module body 5 during its service life. The setting of the backwash system can well deal with this problem.

[0041] like Figure 3 and Figure 5 As shown, specifically, the backwash system includes a backwash pipeline 13 whose two ends are respectively connected to one end of the MBR membrane assembly body 5 away from the water production system and the clean water tank 3, and the backwash pipeline 13 is provided with a backwash pump 14, a backwash positive pressure gauge 15, a backwash flowmeter 16 and a backwash normally closed valve 17 in sequence. Through the above settings, during the backwash operation, the test control system 27 makes the backwash normally closed valve 17 energized and open, thereby ensuring that the backwash pipeline 13 can be in a through state, and the backwash pump 14 generates positive pressure when working, so as to pump the clean water in the clean water tank 3 back to the inner tube of the MBR membrane assembly body 5 along the backwash pipeline 13. The backwash positive pressure gauge 15 and the backwash flowmeter 16 are respectively used to monitor the clean water pressure and clean water flow in the backwash pipeline 13, and the backwash positive pressure gauge 15 and the backwash flowmeter 16 are fixed on the outer surface of the main box 1, so that the tester can intuitively understand the real-time backwash water pressure and backwash flow during the test operation;

[0042] During the backwash operation, since clean water is pumped into the inner tube of the MBR membrane module body 5, as the clean water flow rate continues to increase, the water pressure in the inner tube of the MBR membrane module body 5 increases, so that the clean water in the inner tube flows out from the micropores, and the suspended matter attached to the surface of the MBR membrane module body 5 falls off while the clean water flows out, ensuring the flowability of the MBR membrane module body 5, so that the MBR membrane module body 5 can maintain a flux close to that during normal water production operation, thereby avoiding shortening the effective working time of the MBR membrane module;

[0043] It should be mentioned that during the water production process, the backwash normally closed valve 17 is kept closed to prevent the sewage in the sewage pool 2 from entering the backwash pipeline 13, and during the backwash operation, the water production normally open valve 7 must be energized to keep it in a closed state to prevent the clean water in the inner tube of the MBR membrane module body 5 from flowing into the water production pipeline 6 to form a loop, which affects the normal progress of the backwash operation;

[0044] like Figure 5 As shown, further, a positive pressure sensor 18 and a backwash electronic flowmeter 19 are provided in sequence on the backwash pipeline 13 between the backwash pump 14 and the backwash normally closed valve 17, and the positive pressure sensor 18 and the backwash electronic flowmeter 19 are both electrically connected to the test control system 27. In the above setting, the positive pressure sensor 18 and the backwash electronic flowmeter 19 are also used to monitor the water pressure and flow rate of clean water in the backwash pipeline 13 and the inner tube of the MBR membrane assembly body 5, and transmit them to the test control system 27 in the form of electrical signals for recording. According to the recorded data, the pressure of the backwash pump 14 is controlled to be at a normal value required for the backwash operation, so as to avoid the enlargement of the micropores of the MBR membrane assembly body 5 due to excessive water pressure of the clean water pumped into the inner tube of the MBR membrane assembly body 5, thereby affecting the flux of the MBR membrane assembly body 5.

[0045] Furthermore, the test control system 27 controls the water production system to run for 8 minutes and stop for 2 minutes as a cycle, and the test control system 27 controls the backwash system to run once every 1-2 hours.

[0046] Embodiment 2:

[0047] This embodiment makes one of the optimized designs based on the above embodiment 1. When sewage is stored in the sewage overflow tank 4, the water replenishment system also participates in the water production process of the water production system.

[0048] like Figure 5As shown, specifically, the water replenishment system includes a water replenishment pipeline 20 whose two ends are respectively connected to the sewage overflow tank 4 and the sewage tank 2, and the water replenishment pipeline 20 is connected with a one-way valve 21 and a reflux pump 22 in sequence. In the above arrangement, the sewage passes through the one-way valve 21 in sequence and is pumped into the sewage tank 2 along the water replenishment pipeline 20 by the reflux pump 22. Due to the action of the one-way valve 21, the sewage can only flow from the sewage overflow tank 4 to the sewage tank 2 along the water replenishment pipeline 20, thereby preventing the sewage in the sewage tank 2 from flowing into the sewage overflow tank 4 through the water replenishment pipeline 20, causing a large reduction in the sewage in the sewage tank 2 and making it impossible for the water production operation to proceed normally.

[0049] like Figure 1 and Figure 2 As shown, further, an overflow groove 201 is opened at the upper end of the side wall of the sewage pool 2 close to the sewage overflow pool 4. When the backwash operation is performed, since the clean water flows out from the micropores of the MBR membrane component body 5, the liquid level in the sewage pool 2 rises. When the liquid level rises to a certain height, it flows into the sewage overflow pool 4 through the overflow groove 201. Through the above arrangement, the water level in the sewage pool 2 can be prevented from overflowing due to excessive height and affecting the test environment, and the sewage can be utilized more effectively.

[0050] Embodiment 3:

[0051] like Figure 3 and Figure 5 As shown, this embodiment makes one of the optimized designs based on the above-mentioned embodiment 1, and the sewage pool 2 is also connected to an aeration system, and the aeration system is controlled by a test control system 27. The aeration system includes an aeration pipeline 23 whose two ends are respectively connected to the sewage pool 2 and an aeration pump 24, and the aeration pipeline 23 is also connected to an air flow meter 25. Similarly, the air flow meter 25 is fixed on the outer surface of the main box 1, so that the tester can intuitively understand the real-time aeration value during the test operation;

[0052] like Figure 5 As shown, the aeration system also participates in the water production operation. The aeration pump 24 is controlled by the test control system 27. The aeration pump 24 can pump external air into the sewage pool 2 along the aeration pipeline 23, so that bubbles are continuously generated in the sewage to be treated. During the rising process, the bubbles can drive part of the suspended matter attached to the outer surface of the MBR membrane module body 5 due to the negative pressure to fall off, preventing the suspended matter attached to the outer surface of the MBR membrane module body 5 from condensing due to long-term negative pressure, and further preventing the micropores from being blocked and reducing the water production performance;

[0053] It should be mentioned that the specific aeration value of the aeration pump 24 is set according to the square number of the tested MBR membrane assembly body 5. Specifically, the aeration value of the aeration pump 24 is proportional to the water production per unit time of the tested MBR membrane assembly body 5, thereby ensuring that the water-gas ratio during the water production operation meets the operation requirements;

[0054] like Figure 5 As shown, further, an electronic air flow meter 26 is also provided on the aeration pipeline 23 between the sewage pool 2 and the air flow meter 25, and the electronic air flow meter 26 is electrically connected to the test control system 27. In the above setting, the electronic air flow meter 26 is used to monitor the aeration value in the aeration pipeline 23, and transmits it to the test control system 27 for recording in the form of an electrical signal. According to the recorded data, the aeration value of the aeration head is controlled to be at a normal value required for the water production operation, so as to avoid affecting the water production effect of the MBR membrane component body 5.

[0055] The above embodiments and descriptions are only for illustrating the principles and best embodiments of the present invention. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and improvements, all of which fall within the scope of the present invention to be protected.

Claims

1. An MBR membrane module test device, used for flux testing of an MBR membrane module, comprising a main box (1) and a test control system (27) installed in the main box (1), characterized in that: It also includes a sewage pool (2) formed on the main housing (1) for receiving external sewage, a clean water pool (3) and a sewage overflow pool (4) for receiving excess sewage in the sewage pool (2); an MBR membrane module body (5) fixed in the sewage pool (2), respectively connected to the water production system and the backwash system at both ends of the clean water pool (3) and the MBR membrane module body (5), and respectively connected to the water replenishment system of the sewage pool (2) and the sewage overflow pool (4); during the water production operation, the sewage in the sewage overflow pool (4) is replenished through the water replenishment system. The water is then re-entered into the sewage pool (2), and the water production, backwashing and water replenishment operations of the water production system, the backwashing system and the water replenishment system are all controlled by the test control system (27); the water production system comprises a water production pipeline (6) whose two ends are respectively connected to the end of the MBR membrane assembly body (5) away from the backwashing system and the clean water pool (3), and the water production pipeline (6) is provided with a negative pressure mechanism, a water production normally open valve (7), a water production negative pressure gauge (8), a water production pump (9) and a water production flow meter (10) in sequence, and the water production negative pressure gauge (8) and the water production flow meter ( 10) are fixed on the outer surface of the main housing (1); the backwash system includes a backwash pipeline (13) whose two ends are respectively connected to the end of the MBR membrane assembly body (5) away from the water production system and the clean water tank (3), and the backwash pipeline (13) is provided with a backwash pump (14), a backwash positive pressure gauge (15), a backwash flow meter (16) and a backwash normally closed valve (17) in sequence, and the backwash positive pressure gauge (15) and the backwash flow meter (16) are both fixed on the outer surface of the main housing (1); the water replenishment system includes a backwash pipeline (13) whose two ends are respectively connected to the sewage overflow A water supply pipeline (20) is connected between the sewage pool (4) and the sewage pool (2), and a one-way valve (21) and a reflux pump (22) are connected to the water supply pipeline (20) in sequence; the sewage pool (2) is also connected to an aeration system, and the aeration system is controlled by the test control system (27). The aeration system includes an aeration pipeline (23) whose two ends are respectively connected to the sewage pool (2) and an aeration pump (24), and the aeration pipeline (23) is also connected to an air flow meter (25), and the air flow meter (25) is fixed on the outer surface of the main box (1).

2. A MBR membrane module testing device according to claim 1, characterized in that: A negative pressure sensor (11) and a water production electronic flow meter (12) are also provided in sequence on the water production pipeline (6) between the water production normally open valve (7) and the water production pump (9), and the negative pressure sensor (11) and the water production electronic flow meter (12) are both electrically connected to the test control system (27).

3. The MBR membrane module testing device according to claim 1, characterized in that: A positive pressure sensor (18) and a backwash electronic flow meter (19) are also provided in sequence on the backwash pipeline (13) between the backwash pump (14) and the backwash normally closed valve (17), and the positive pressure sensor (18) and the backwash electronic flow meter (19) are both electrically connected to the test control system (27).

4. The MBR membrane module testing device according to claim 1, characterized in that: An overflow groove (201) is provided at the upper end of the side wall of the sewage pool (2) close to the sewage overflow pool (4). When the sewage level in the sewage pool (2) reaches a certain height, the sewage flows into the sewage overflow pool (4) through the overflow groove (201).

5. The MBR membrane module testing device according to claim 1, characterized in that: An electronic air flow meter (26) is also provided on the aeration pipeline (23) between the sewage pool (2) and the air flow meter (25), and the electronic air flow meter (26) is electrically connected to the test control system (27).

6. The MBR membrane module testing device according to claim 1, characterized in that: The test control system (27) controls the water production system to run for 8 minutes and stop for 2 minutes as a cycle, and the test control system (27) controls the backwash system to run once every 1-2 hours.

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