Membrane scrubbing and aerating device of MBR (Membrane Bioreactor) membrane system

Abstract

The utility model discloses a membrane scrubbing and aerating device of an MBR (Membrane Bioreactor) membrane system. The membrane scrubbing and aerating device comprises a membrane scrubbing and aerating module, a flushing module, an aerating module and a control module, the membrane scrubbing aeration module is used for membrane scrubbing aeration of the MBR membrane module; the flushing module is connected with a membrane scrubbing aeration pipeline of the membrane scrubbing aeration module and is used for performing high-pressure flushing on the MBR membrane module by using flushing water; the air-entrapping module is connected with the flushing module and is used for providing compressed air for the flushing water; the control module comprises a water production differential pressure transmitter and a PLC (Programmable Logic Controller), the water production differential pressure transmitter is used for measuring the transmembrane pressure difference, and the PLC is used for controlling the flushing module and the gas filling module to carry out gas-water two-phase pulse flushing on the MBR membrane module when the transmembrane pressure difference exceeds a set value A. According to the utility model, the full-automatic membrane scrubbing aeration of the membrane module device and the automatic flushing of the aeration structure can be realized, the dredging of the aeration structure of the MBR membrane module device is realized, the membrane scrubbing aeration effect is ensured, the transmembrane pressure difference can be rapidly reduced in a short time, and the aims of slowing down the membrane filament pollution and avoiding the continuous rising risk of the transmembrane pressure difference can be achieved through long-term operation.

Description

Technical Field

[0001] This utility model relates to the field of membrane separation technology, specifically to a membrane scrubbing and aeration device for an MBR membrane system. Background Technology

[0002] Membrane bioreactors (MBRs) are widely used in wastewater treatment and resource recovery projects due to their high efficiency, energy saving, lack of secondary pollution, good effluent quality, small footprint, and high degree of automation. In an MBR system, under certain pressure, water in the wastewater diffuses from the influent side to the product water side through the micropores on the membrane surface, while suspended solids and microorganisms are retained on the influent side of the membrane. The pressure difference across the membrane at this point is called the transmembrane pressure differential. The magnitude of the transmembrane pressure differential has a significant impact on the operation of the MBR system, directly affecting membrane flux, membrane fouling, and operational stability. An appropriate transmembrane pressure differential can ensure the system's operating flux, help prevent membrane surface clogging and the accumulation of retained substances, and improve the membrane's antifouling ability and operational stability. In actual MBR operation, through reasonable design and management, an appropriate transmembrane pressure differential can be maintained to ensure the stable and reliable operation of the MBR system.

[0003] Conventional MBR systems employ membrane scrubbing aeration to mitigate membrane fiber surface fouling and slow the rise in transmembrane pressure differential. Current membrane scrubbing aeration methods typically use blowers to aerate the bottom aeration heads or perforated pipes of the membrane module, generating numerous bubbles that scrub the membrane fibers from bottom to top. However, under high-concentration sludge mixed liquor conditions, the high-temperature air inside the aeration heads or perforated pipes accelerates sludge drying and adhesion to the aeration structure, causing blockage and affecting the membrane scrubbing aeration effect, thus hindering the stable operation of the MBR system. Summary of the Invention

[0004] To address the aforementioned problems, this utility model provides a membrane scrubbing and aeration device for an MBR membrane system.

[0005] The technical solution adopted in this utility model is:

[0006] A membrane scrubbing and aeration device for an MBR membrane system includes a membrane scrubbing and aeration module, a flushing module, an aeration module, and a control module;

[0007] The membrane scrubbing and aeration module is used for membrane scrubbing and aeration in MBR membrane modules.

[0008] The flushing module is connected to the membrane scrubbing aeration pipe of the membrane scrubbing aeration module, and is used to perform high-pressure flushing of the MBR membrane module with flushing water;

[0009] The air supply module is connected to the flushing module and is used to provide compressed air for the flushing water;

[0010] The control module includes a product water differential pressure transmitter and a PLC controller. The product water differential pressure transmitter is used to measure the transmembrane pressure difference, and the PLC controller is used to control the flushing module and the aeration module to perform gas-water two-phase pulse flushing on the MBR membrane module when the transmembrane pressure difference exceeds a set value A.

[0011] Furthermore, it also includes a dosing module, which is connected to the flushing module and is used to provide flushing agents to the flushing water; the PLC controller is used to control the flushing module, the gas supply module, and the dosing module to jointly perform gas-water two-phase pulsed chemical flushing on the MBR membrane module when the transmembrane pressure difference exceeds the set value B; the set value B is greater than the set value A.

[0012] Furthermore, the membrane scrubbing aeration module includes a membrane scrubbing blower and a membrane scrubbing aeration pipe, and an aeration switching valve is installed on the membrane scrubbing aeration pipe; the membrane scrubbing blower is connected to the aeration structure at the bottom of the membrane module through the membrane scrubbing aeration pipe and the aeration switching valve; both the membrane scrubbing blower and the aeration switching valve are connected to a PLC controller.

[0013] Furthermore, the flushing module includes a flushing water tank, a high-pressure flushing pump, and flushing pipes. A main flushing valve is installed on the flushing pipes. The flushing water tank is connected to the membrane scrubbing and aeration pipes through the high-pressure flushing pump, flushing pipes, and main flushing valve. Both the high-pressure flushing pump and the main flushing valve are connected to a PLC controller.

[0014] Furthermore, the flushing pipeline is also equipped with a flushing differential pressure transmitter, which is connected to a PLC controller.

[0015] Furthermore, the air filling module includes an air compressor system and a compressed air pipeline. The compressed air pipeline is equipped with a pulse solenoid valve. The air compressor system is connected to the flushing pipeline through the compressed air pipeline and the pulse solenoid valve. The air compressor system and the pulse solenoid valve are connected to the PLC controller.

[0016] Furthermore, the dosing module includes a sodium hypochlorite dosing system and a citric acid dosing system, which are connected to the flushing pipeline of the flushing module via a pipeline mixer.

[0017] Furthermore, the sodium hypochlorite dosing system includes a first storage tank, a first dosing pump, a first dosing valve, and a first dosing pipe. The first storage tank is connected to the first inlet of the pipeline mixer via the first dosing pipe, the first dosing pump, and the first dosing valve. The citric acid dosing system includes a second storage tank, a second dosing pump, a second dosing valve, and a second dosing pipe. The second storage tank is connected to the second inlet of the pipeline mixer via the second dosing pipe, the second dosing pump, and the second dosing valve. The inlet and outlet of the pipeline mixer are connected to the flushing pipe. Both the first and second dosing valves are connected to a PLC controller.

[0018] The beneficial effects of this utility model are:

[0019] 1. The membrane scrubbing and aeration device with built-in high-pressure water flushing, air pulse flushing, and chemical-enhanced pulse flushing functions can realize fully automated membrane scrubbing and aeration of the membrane module and unclog and flush the aeration structure of the MBR membrane module, ensuring the membrane scrubbing and aeration effect. In the short term, it can quickly reduce the transmembrane pressure difference, and in the long term, it can slow down membrane fiber fouling and avoid the risk of continuous increase in transmembrane pressure difference.

[0020] 2. Employing PLC fully automatic control technology, interlocked with the product water differential pressure transmitter, it achieves fully automatic control of MBR membrane scrubbing and aeration, as well as two-phase pulse flushing of the aeration structure. This adapts to membrane modules with varying degrees of fouling, automatically executing corresponding membrane scrubbing and aeration structure flushing strategies. For membrane modules with severely fouled aeration structures, there is no need to shut down production, remove them, or perform manual flushing, saving flushing time and reducing manual labor. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the membrane scrubbing and aeration device for an MBR membrane system according to the present invention.

[0022] Attached reference numerals: 1. Flushing water tank; 2. Flushing water tank outlet valve; 3. High-pressure flushing pump; 4. Flushing check valve; 5. Flushing maintenance valve; 6. Flushing differential pressure transmitter; 7. Pipeline mixer; 8. Flushing main valve; 9. Flushing drain valve; 10. Flushing branch valve; 11. Compressed air system; 12. Compressed air check valve; 13. Pulse solenoid valve; 14. Sodium hypochlorite dosing system; 15. Citric acid dosing system; 16. Sodium hypochlorite dosing valve; 17. Citric acid dosing valve; 18. Membrane scrubbing blower; 19. Aeration check valve; 20. Aeration switching valve; 21. Permeate branch valve; 22. Permeate differential pressure transmitter; 23. Membrane module; 24. Aeration structure; 25. Membrane tank; 101. Flushing pipeline; 102. Compressed air pipeline; 103. Membrane scrubbing aeration pipeline; 104. Drain pipeline; 105. Main permeate pipeline; 106. First dosing pipe; 107. Second dosing pipe. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solution of this utility model will be clearly and completely described below in conjunction with the accompanying drawings and a preferred embodiment.

[0024] A membrane scrubbing and aeration device for an MBR membrane system includes a membrane scrubbing and aeration module, a flushing module, an aeration module, a chemical dosing module, and a control module.

[0025] The MBR membrane system includes a membrane tank 25, which contains several membrane modules 23. Each membrane module is equipped with a membrane scrubbing aeration pipe and a permeate pipe. Each permeate pipe is connected to the main permeate pipe 105 through a permeate branch and a permeate branch valve 21. A permeate differential pressure transmitter 22 is installed on the main permeate pipe 105.

[0026] The membrane scrubbing aeration module includes a membrane scrubbing blower 18 and a membrane scrubbing aeration pipe 103. The membrane scrubbing aeration pipe is sequentially equipped with an aeration check valve 19, an aeration switching valve 20, and a drain port. The membrane scrubbing blower is connected to the aeration structure 24 at the bottom of each membrane module 23 via the membrane scrubbing aeration pipe, aeration check valve 19, aeration switching valve 20, and flushing branch valve 10. The aeration switching valve 20 is used to switch the aeration and flushing sequence of the membrane module, and the aeration check valve 19 is used to prevent flushing liquid from flowing back into the blower. A drain pipe 104, which can extend into the membrane tank, is connected to the drain port. A flushing drain valve 9 is installed on the drain pipe, allowing accumulated liquid in the membrane scrubbing aeration pipe to be discharged into the membrane tank via the drain pipe 104. The membrane scrubbing aeration module is used for membrane scrubbing aeration of MBR membrane modules; this is existing technology.

[0027] The flushing module includes a flushing water tank 1, a high-pressure flushing pump 3, and a flushing pipeline 101. The flushing pipeline 101 is sequentially equipped with a main flushing valve 8, an air inlet, a pipeline mixer 7, a pressure testing port, a flushing maintenance valve 5, a flushing check valve 4, the high-pressure flushing pump 3, and a flushing water tank outlet valve 2. The flushing water tank is connected to the membrane scrubbing and aeration pipeline 103 via the flushing pipeline, passing through the flushing water tank outlet valve 2, the high-pressure flushing pump 3, the flushing check valve 4, the flushing maintenance valve 5, the pipeline mixer 7, and the main flushing valve 8. A flushing differential pressure transmitter 6 is installed on the pressure testing port to monitor the flushing water pressure difference and ensure flushing effectiveness. The air inlet is used to connect to the air supply module.

[0028] The pipeline mixer 7 is equipped with an inlet, an outlet, a first chemical inlet, and a second chemical inlet. The inlet and outlet are connected to the flushing pipeline 101, and the first and second chemical inlets are used to connect to the dosing module.

[0029] The clean water in the flushing tank enters the membrane scrubbing aeration pipe 103 through the flushing pipe 101, and then enters the aeration flushing structure of each membrane module to achieve flushing of the aeration structure.

[0030] The air supply module includes an air compressor system 11 and a compressed air pipeline 102. The compressed air pipeline is equipped with a compressed air check valve 12 and a pulse solenoid valve 13. The air compressor system 11 is existing technology and consists of an air compressor, a compressed air storage tank, and a compressed air pipeline. The compressed air generated by the air compressor is stored in the compressed air storage tank. The compressed air storage tank is connected to the air supply port of the flushing pipeline 101 via the compressed air pipeline 102, the compressed air check valve 12, and the pulse solenoid valve 13 in sequence. The pulsed air supply to the flushing pipeline 101 is achieved by opening and closing the pulse solenoid valve 13, thereby achieving the effect of using a gas-water two-phase pulse cleaning membrane module aeration structure.

[0031] The dosing module includes a sodium hypochlorite dosing system 14 and a citric acid dosing system 15. Both systems are existing technologies and consist of a storage tank, a dosing pump, and a dispensing pipe. The sodium hypochlorite dosing system 14 is used to prepare a bactericide solution primarily composed of sodium hypochlorite, while the citric acid dosing system 15 is used to prepare a descaling solution primarily composed of citric acid.

[0032] In specific implementation, the sodium hypochlorite dosing system 14 includes a first storage tank, a first dosing pump, a first dosing valve 16, and a first dosing pipe 106. The first storage tank is connected to the first inlet of the pipeline mixer 7 through the first dosing pipe, the first dosing pump, and the first dosing valve. The citric acid dosing system 15 includes a second storage tank, a second dosing pump, a second dosing valve 17, and a second dosing pipe 107. The second storage tank is connected to the second inlet of the pipeline mixer 7 through the second dosing pipe, the second dosing pump, and the second dosing valve.

[0033] The dosing module is connected to the flushing module via the pipeline mixer 7. The pipeline mixer 7 can mix the bactericide or descaling agent with clean water and then pump it into the membrane module aeration structure to enhance the flushing effect on the aeration structure.

[0034] The control module includes a PLC controller and a product water differential pressure transmitter 22. The product water differential pressure transmitter 22 transmits signals to the PLC controller to measure the transmembrane pressure difference.

[0035] The flushing branch valve 10, flushing main valve 8, flushing drain valve 9, aeration switching valve 20, pulse solenoid valve 13, first dosing valve 16, second dosing valve 17, membrane scrubbing blower 18, air compressor, first dosing pump, second dosing pump, and high-pressure flushing pump 3 are all connected to the PLC controller. Through PLC fully automatic control technology, the equipment can be automatically started and stopped, and the flushing mode can be automatically switched, thereby realizing fully automated membrane scrubbing and aeration of the membrane module and automatic flushing of the aeration structure.

[0036] For example, by setting an alarm value for the curvature of the transmembrane pressure difference increase, the flushing mode is automatically selected and the flushing sequence is automatically executed to ensure the membrane scrubbing and aeration effect and avoid the continuous increase of the transmembrane pressure difference. The specific method is as follows:

[0037] When the transmembrane pressure difference exceeds the set value A, the PLC controls the flushing module and the aeration module to perform gas-water two-phase pulse flushing on the MBR membrane module. During the flushing process, the membrane scrubbing blower 18 stops working and the aeration switching valve 20 is closed.

[0038] When the transmembrane pressure difference exceeds the set value B, and the set value B is greater than the set value A, the PLC controls the flushing module, the aeration module, and the chemical dosing module to jointly perform gas-water two-phase pulse chemical flushing on the MBR membrane module; during the flushing process, the membrane scrubbing blower 18 stops working and the aeration switching valve 20 closes.

[0039] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications are also within the protection scope of the present utility model.

Claims

1. A membrane scrubbing and aeration device for an MBR membrane system, characterized in that, It includes a membrane scrubbing and aeration module, a rinsing module, an air supply module, and a control module; The membrane scrubbing and aeration module is used for membrane scrubbing and aeration in MBR membrane modules. The flushing module is connected to the membrane scrubbing aeration pipe of the membrane scrubbing aeration module, and is used to perform high-pressure flushing of the MBR membrane module with flushing water; The air supply module is connected to the flushing module and is used to provide compressed air for the flushing water; The control module includes a product water differential pressure transmitter and a PLC controller. The product water differential pressure transmitter is used to measure the transmembrane pressure difference, and the PLC controller is used to control the flushing module and the aeration module to perform gas-water two-phase pulse flushing on the MBR membrane module when the transmembrane pressure difference exceeds a set value A.

2. The membrane scrubbing and aeration device according to claim 1, characterized in that, It also includes a dosing module. The dosing module is connected to the flushing module and is used to provide flushing agents to the flushing water; the PLC controller is used to control the flushing module, the gas supply module, and the dosing module to jointly perform gas-water two-phase pulse flushing of the MBR membrane module when the transmembrane pressure difference exceeds the set value B; the set value B is greater than the set value A.

3. The membrane scrubbing and aeration device according to claim 1 or 2, characterized in that, The membrane scrubbing aeration module includes a membrane scrubbing blower (18) and a membrane scrubbing aeration pipe (103). An aeration switching valve (20) is provided on the membrane scrubbing aeration pipe. The membrane scrubbing blower is connected to the aeration structure at the bottom of the membrane unit through the membrane scrubbing aeration pipe and the aeration switching valve. Both the membrane scrubbing blower (18) and the aeration switching valve (20) are connected to the PLC controller.

4. The membrane scrubbing and aeration device according to claim 1 or 2, characterized in that, The flushing module includes a flushing water tank (1), a high-pressure flushing pump (3) and a flushing pipe (101). A flushing main valve (8) is provided on the flushing pipe (101). The flushing water tank is connected to the membrane scrubbing aeration pipe (103) through the high-pressure flushing pump, the flushing pipe and the flushing main valve. The high-pressure flushing pump (3) and the flushing main valve (8) are both connected to the PLC controller.

5. The membrane scrubbing and aeration device according to claim 4, characterized in that, The flushing pipe (101) is also equipped with a flushing differential pressure transmitter (6), which is connected to the PLC controller.

6. The membrane scrubbing and aeration device according to claim 1 or 2, characterized in that, The air supply module includes an air compressor system (11) and a compressed air pipeline (102). A pulse solenoid valve (13) is provided on the compressed air pipeline (102). The air compressor system (11) is connected to the flushing pipeline (101) through the compressed air pipeline (102) and the pulse solenoid valve (13). The air compressor system (11) and the pulse solenoid valve (13) are connected to the PLC controller.

7. The membrane scrubbing and aeration device according to claim 2, characterized in that, The dosing module includes a sodium hypochlorite dosing system (14) and a citric acid dosing system (15), which are connected to the flushing pipe of the flushing module via a pipe mixer (7).

8. The membrane scrubbing and aeration device according to claim 7, characterized in that, The sodium hypochlorite dosing system (14) includes a first storage tank, a first dosing pump, a first dosing valve (16), and a first dosing pipe (106). The first storage tank is connected to the first inlet of the pipeline mixer (7) through the first dosing pipe, the first dosing pump, and the first dosing valve. The citric acid dosing system (15) includes a second storage tank, a second dosing pump, a second dosing valve (17), and a second dosing pipe (107). The second storage tank is connected to the second inlet of the pipeline mixer (7) through the second dosing pipe, the second dosing pump, and the second dosing valve. The inlet and outlet of the pipeline mixer (7) are connected to the flushing pipe. The first dosing valve (16) and the second dosing valve (17) are both connected to a PLC controller.

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