An aeration system that automatically adjusts the purge air volume of an MBR membrane system

Abstract

This utility model relates to the field of wastewater treatment technology, aiming to solve the problems of inaccurate adjustment, low operating efficiency, and high operating costs in existing technologies. It provides an aeration system that automatically adjusts the purge airflow of an MBR membrane system, including a programmable control system. The programmable control system is electrically connected to a sludge concentration meter, a pressure transmitter, a liquid level sensor, an air flow meter, a temperature sensor, a gas regulating valve, a gas vent valve, and a purge blower. The purge blower is connected to a main purge pipe, which is connected to several purge branch pipes. These branch pipes are connected to several membrane frames, which are adapted to a membrane tank. The sludge concentration meter, liquid level sensor, and temperature sensor are installed inside the membrane tank. The air flow meter, gas regulating valve, and gas vent valve are all installed on the main purge pipe or purge branch pipes, and the pressure transmitter is installed on the effluent pipe. The advantages of this utility model are precise adjustment, high operating efficiency, high operating stability, low operating costs, and reduced energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and more specifically, to an aeration system that automatically adjusts the purge air volume of an MBR membrane system. Background Technology

[0002] In MBR membrane system wastewater treatment processes, the stable and efficient operation of membrane modules plays a decisive role in wastewater purification. The purge air volume, as a key factor in maintaining membrane module performance, requires proper adjustment. Traditional aeration systems struggle to adjust the purge air volume in a timely manner based on dynamic changes in sludge concentration, leading to excessive sludge accumulation on the membrane surface and affecting membrane flux. When transmembrane pressure difference increases due to membrane fouling, the purge air volume cannot be increased quickly and promptly to alleviate fouling. When membrane module liquid levels become unbalanced, the aeration intensity of corresponding areas cannot be adjusted specifically, resulting in uneven aeration. Furthermore, the purge air volume cannot be optimized based on seasonal temperature changes, leading to excessive aeration due to low water viscosity in summer and insufficient aeration in winter, wasting energy. These shortcomings of traditional aeration systems stem from the membrane system's inability to fully perceive and respond to the complex and changing operating conditions during membrane tank operation. These problems severely impact wastewater treatment efficiency, increase operating costs, and hinder the widespread application and development of MBR membrane tank technology. Utility Model Content

[0003] The present invention aims to provide an aeration system that automatically adjusts the purge air volume of an MBR membrane system, in order to solve the problems in the prior art, such as the inability to accurately adjust the purge air volume, low membrane tank operating efficiency, poor membrane tank operating stability, high operating costs, and the inability to promote the advancement of wastewater treatment technology.

[0004] The embodiments of this utility model are implemented as follows:

[0005] This utility model embodiment provides an aeration system that automatically adjusts the purge air volume of an MBR membrane system, which includes a programmable control system for control.

[0006] The programmable control system is electrically connected to a sludge concentration meter, pressure transmitter, liquid level sensor, air flow meter, temperature sensor, gas regulating valve, gas venting valve, and purge blower;

[0007] The outlet of the aforementioned purge blower is connected to a purge main pipe, and the end of the aforementioned purge main pipe away from the aforementioned purge blower is connected to several purge branch pipes. The ends of the aforementioned purge branch pipes away from the aforementioned purge main pipe are each connected to several membrane frames. The air outlets of the aforementioned purge branch pipes are located at the bottom of the aforementioned membrane frames. The top of the aforementioned membrane frames is connected to a water outlet pipe, and the aforementioned membrane frames are adapted to a membrane tank.

[0008] The sludge concentration meter, the liquid level sensor, and the temperature sensor are all adapted to be installed in the membrane tank. The air flow meter, the gas regulating valve, and the gas venting valve are all installed on the main purging pipe or the branch purging pipe. The pressure transmitter is installed on the outlet pipe.

[0009] During stable operation of the MBR membrane system, sludge concentration meters, liquid level sensors, and temperature sensors are installed in each membrane tank to continuously monitor real-time sludge concentration data, membrane module liquid level, and water temperature. The collected real-time data is stored, and the average data over a period of time is calculated and fed back to the programmable control system. At the same time, pressure transmitters installed on the effluent pipes of each membrane module detect the pipeline pressure and calculate the transmembrane pressure difference. Air flow meters installed on the main and branch purge pipes monitor the air flow in the main and branch purge pipes in real time. These data provide a comprehensive and accurate basis for subsequent air volume adjustment.

[0010] The aeration system for automatically adjusting the purge air volume of an MBR membrane system disclosed in this embodiment automatically adapts and adjusts the purge air volume of the MBR membrane system by collecting real-time changes in parameters such as sludge concentration, membrane tank level, water temperature, transmembrane pressure difference, and membrane module start-up and shutdown. This results in a system that offers the following benefits: precise adjustment of the purge air volume, high membrane tank operating efficiency, high membrane tank operating stability, low operating cost, effective protection of membrane modules, prevention of shortened membrane module lifespan, and reduced purge air volume and energy consumption while achieving the same aeration effect.

[0011] Optionally, the above-mentioned purging main pipe is equipped with a main pipe gas regulating valve for adjusting the total purging component, and the main pipe gas regulating valve is electrically connected to the programmable control system.

[0012] With this configuration, the main gas regulating valve and the frequency converter work together, making it easy to control the increase or decrease of the main purging air volume through a programmable control system.

[0013] Optionally, the aforementioned purging main pipe is equipped with a main pipe air flow meter for detecting air flow, and the main pipe air flow meter is electrically connected to the programmable control system.

[0014] With this configuration, the main air flow meter can monitor the air flow in the main purging pipe in real time, providing data support for air volume adjustment. This allows the programmable control system to receive the signal from the main air flow meter and output control commands according to the preset control strategy to adjust the operating parameters and opening of the purging fan and the gas regulating valve.

[0015] Optionally: A secondary pipe is connected to the main purge pipe between the main gas regulating valve and the purge blower, and the gas vent valve is installed on the secondary pipe. The gas vent valve is electrically connected to the programmable control system.

[0016] With this configuration, when the purge air volume drops to the lower limit of the purge fan adjustment, the opening can be adjusted in conjunction with the gas vent valve, the main gas regulating valve, and the main air flow meter to achieve the target air volume.

[0017] Optionally: the above membrane tank has a first membrane tank and a second membrane tank;

[0018] The end of the aforementioned purging main pipe away from the aforementioned purging blower is connected to a first purging branch pipe and a second purging branch pipe. The end of the aforementioned first purging branch pipe away from the aforementioned purging main pipe is connected to a plurality of first membrane frames. The end of the aforementioned second purging branch pipe away from the aforementioned purging main pipe is connected to a plurality of second membrane frames. The plurality of the aforementioned first membrane frames are located inside the aforementioned first membrane tank, and the plurality of the aforementioned second membrane frames are located inside the aforementioned second membrane tank.

[0019] A first branch gas regulating valve is installed on the first purge branch pipe, and a second branch gas regulating valve is installed on the second purge branch pipe. Both the first and second branch gas regulating valves are electrically connected to the programmable control system.

[0020] With this configuration, the main purging pipe blows purging gas into the first and second purging branch pipes. The gas is blown out from the bottom of the first and second membrane frames, generating bubbles in the first or second membrane tank. A large number of bubbles rise and cover the first and second membrane frames, thereby promptly removing the sludge accumulated on the membrane surface inside the first and second membrane frames. This prevents excessive sludge from affecting the membrane flux, allowing the membrane to continuously filter water, which is then discharged from the center of the membrane through the outlet pipe. The gas regulating valves of the first and second branch pipes work in conjunction with the frequency converter, facilitating the adjustment of the purging air volume in the first and second purging branch pipes through a programmable control system.

[0021] Optionally, a first branch air flow meter is also installed on the first purge branch pipe, and a second branch air flow meter is also installed on the second purge branch pipe. Both the first branch air flow meter and the second branch air flow meter are electrically connected to the programmable control system.

[0022] With this configuration, the first branch air flow meter and the second branch air flow meter are used to monitor the air flow in the first purge branch and the second purge branch in real time, providing data support for air volume adjustment.

[0023] Optionally, a first liquid level sensor and a second liquid level sensor for detecting water level are respectively installed on the top of the first membrane tank and the second membrane tank, and both the first liquid level sensor and the second liquid level sensor are electrically connected to the programmable control system.

[0024] With this configuration, the first liquid level sensor and the second liquid level sensor can collect the liquid level of the membrane module in the first membrane tank and the second membrane tank, which facilitates the storage of the collected real-time data and the calculation of the average data over a period of time, which is then fed back to the programmable control system. This data provides a comprehensive and accurate basis for subsequent airflow adjustment.

[0025] Optionally, a first sludge concentration meter and a second sludge concentration meter for detecting sludge concentration data are respectively suspended below the liquid level of the first membrane tank and the second membrane tank. Both the first sludge concentration meter and the second sludge concentration meter are electrically connected to the programmable control system.

[0026] With this setup, the first sludge concentration meter and the second sludge concentration meter will simultaneously report the sludge concentration of the membrane group corresponding to the first membrane tank or the second membrane tank. Once the programmable control system detects a change in the data collected by the sludge concentration meter, it will begin to adjust the purging air volume.

[0027] Optionally, the bottom of the first membrane tank and the second membrane tank are respectively connected to a first temperature sensor and a second temperature sensor for detecting water temperature, and both the first temperature sensor and the second temperature sensor are electrically connected to the programmable control system.

[0028] With this setup, the water temperature fed back by the first and second temperature sensors will also affect the adjustment of the purge air volume. In the high temperatures of summer, the viscosity of water is low, and the programmable control system will appropriately reduce the purge air volume to avoid over-aeration. In the low temperatures of winter, the viscosity of water increases, the resistance encountered by the purge gas as it rises in the water increases, and the rising speed of the bubbles slows down. In order to achieve the same membrane surface scouring effect as at room temperature, the programmable control system will automatically increase the purge air volume to enhance the shear force of the bubbles on the membrane surface and prevent pollutants such as sludge from depositing on the membrane surface.

[0029] Optionally: the above-mentioned water outlet pipe has a first water production pipe and a second water production pipe, the first water production pipe is connected to a plurality of the first membrane frames in the first membrane tank, the second water production pipe is connected to a plurality of the second membrane frames in the second membrane tank, and a main water production pipe is connected to the end of the first water production pipe and the second water production pipe away from the first membrane frame and the second membrane frame.

[0030] A first pressure transmitter and a second pressure transmitter are respectively installed on the first water production pipe and the second water production pipe. Both the first pressure transmitter and the second pressure transmitter are electrically connected to the programmable control system.

[0031] With this configuration, the first and second pressure transmitters can detect the pressures of the first and second product water pipes and calculate the transmembrane pressure difference.

[0032] Optionally: The above-mentioned purge blower is connected to a frequency converter.

[0033] With this setup, the speed of the purge fan is adjusted by a frequency converter, thereby achieving precise control of the output air volume of the purge fan. Furthermore, the purge fan is selected to meet the maximum purge air volume requirement of a single membrane tank.

[0034] In summary, the aeration system for automatically adjusting the purge air volume of an MBR membrane system disclosed in this utility model has the beneficial effects of precise adjustment of the purge air volume, high membrane tank operating efficiency, high membrane tank operating stability, low operating cost, effective protection of membrane modules, prevention of shortening of membrane module life, and reduction of purge air volume and energy consumption under the same aeration effect. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the structure of an aeration system that automatically adjusts the purge air volume of an MBR membrane system according to an embodiment of this utility model.

[0037] Icons: 1-Sludge concentration meter, 2-Pressure transmitter, 3-Level sensor, 4-Air flow meter, 5-Temperature sensor, 6-Gas regulating valve, 7-Gas vent valve, 8-Purge blower, 9-Purge main pipe, 10-Purge branch pipe, 11-Membrane frame, 12-Effluent pipe, 13-Membrane tank, 14-Main pipe gas regulating valve, 15-Main pipe air flow meter, 16-Sub-pipe, 18-First membrane tank, 19-Second membrane tank, 20-First purge branch pipe, 21-Second purge branch pipe, 22-First membrane frame, 2 3-Second membrane frame, 24-First branch gas regulating valve, 25-Second branch gas regulating valve, 26-First branch air flow meter, 27-Second branch air flow meter, 28-First liquid level sensor, 29-Second liquid level sensor, 30-First sludge concentration meter, 31-Second sludge concentration meter, 32-First temperature sensor, 33-Second temperature sensor, 34-First product water pipe, 35-Second product water pipe, 36-Main product water pipe, 37-First pressure transmitter, 38-Second pressure transmitter. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0040] Example

[0041] See Figure 1 This embodiment proposes an aeration system that automatically adjusts the purge air volume of an MBR membrane system, including a programmable control system (not shown in the figure).

[0042] The programmable control system is electrically connected to sludge concentration meter 1, pressure transmitter 2, liquid level sensor 3, air flow meter 4, temperature sensor 5, gas regulating valve 6, gas venting valve 7, and purge fan 8.

[0043] The outlet of the purge blower 8 is connected to the purge main pipe 9. The end of the purge main pipe 9 away from the purge blower 8 is connected to several purge branch pipes 10. The ends of the several purge branch pipes 10 away from the purge main pipe 9 are all connected to several membrane frames 11. The air outlets of the several purge branch pipes 10 are located at the bottom of the membrane frames 11. The top of the several membrane frames 11 is connected to the water outlet pipe 12. The several membrane frames 11 are adapted to the membrane tank 13.

[0044] The sludge concentration meter 1, liquid level sensor 3 and temperature sensor 5 are all adapted and installed in the membrane tank 13. The air flow meter 4, gas regulating valve 6 and gas venting valve 7 are all installed on the main purging pipe 9 or the branch purging pipe 10. The pressure transmitter 2 is installed on the outlet pipe 12.

[0045] During stable operation of the MBR membrane system, sludge concentration meter 1, liquid level sensor 3, and temperature sensor 5 are installed in each membrane tank 13 to continuously monitor real-time sludge concentration data, membrane level, and water temperature. The collected real-time data is stored, and the average data over a period of time is calculated and fed back to the programmable control system. At the same time, pressure transmitters installed on the effluent pipes 12 of each membrane tank 13 detect the pipeline pressure and calculate the transmembrane pressure difference. Air flow meters installed on the purge main pipe 9 and purge branch pipes monitor the air flow in the purge main pipe 9 and purge branch pipes in real time. These data provide a comprehensive and accurate basis for subsequent air volume adjustment.

[0046] The aeration system for automatically adjusting the purge air volume of an MBR membrane system disclosed in this embodiment automatically adapts and adjusts the purge air volume of the MBR membrane system by collecting real-time changes in parameters such as sludge concentration, membrane tank level, water temperature, transmembrane pressure difference, and membrane module start-up and shutdown. This results in a system that offers the following benefits: precise adjustment of the purge air volume, high membrane tank operating efficiency, high membrane tank operating stability, low operating cost, effective protection of membrane modules, prevention of shortened membrane module lifespan, and reduced purge air volume and energy consumption while achieving the same aeration effect.

[0047] In this embodiment, one end of the outlet pipe 12 is connected to a water pump. The first water production pipe 34 and the second water production pipe 35 draw in the membranes in the first membrane frame 22 and the second membrane frame 23. The center of the membrane generates a suction force, and the water in the external membrane tank 13 will pass through the membrane filtration and be pumped away by the first water production pipe 34 and the second water production pipe 35. During this process, the membrane surface is easily blocked by foreign objects, preventing water from passing through the membrane filtration. Therefore, gas is blown to the bottom of the first membrane frame 22 and the second membrane frame 23 through the first purge branch pipe 20 and the second purge branch pipe 21. The gas generates bubbles in the water, and the foreign objects on the membrane surface are removed by the bubble purge, thereby facilitating continuous water filtration by the membrane.

[0048] See Figure 1The main purge pipe 9 is equipped with a main purge gas regulating valve 14 for adjusting the total purge volume. The main purge gas regulating valve 14 is electrically connected to the programmable control system. The main purge gas regulating valve 14 works in conjunction with the frequency converter, which facilitates the control of the increase or decrease of the main purge air volume through the programmable control system.

[0049] The purge main pipe 9 is equipped with a main pipe air flow meter 15 for detecting air flow. The main pipe air flow meter 15 is electrically connected to the programmable control system. The main pipe air flow meter 15 can monitor the air flow in the purge main pipe 9 in real time, providing data support for air volume adjustment. The programmable control system can receive the signal fed back by the main pipe air flow meter 15 and output control commands according to the preset control strategy to adjust the operating parameters and opening degree of the purge blower 8 and the gas regulating valve.

[0050] A secondary pipe 16 is connected to the main purge pipe 9 between the main gas regulating valve 14 and the purge fan 8. A gas vent valve 7 is installed on the secondary pipe 16. The gas vent valve 7 is electrically connected to the programmable control system. When the purge air volume drops to the lower limit of the adjustment of the purge fan 8, the opening can be adjusted in conjunction with the gas vent valve 7, the main gas regulating valve 14 and the main air flow meter 15 to achieve the target air volume.

[0051] See Figure 1 The membrane tank has a first membrane tank 18 and a second membrane tank 19;

[0052] The end of the purge main pipe 9 away from the purge blower 8 is connected to a first purge branch pipe 20 and a second purge branch pipe 21. The end of the first purge branch pipe 20 away from the purge main pipe 9 is connected to a plurality of first membrane frames 22. The end of the second purge branch pipe 21 away from the purge main pipe 9 is connected to a plurality of second membrane frames 23. The plurality of first membrane frames 22 are located inside the first membrane tank 18, and the plurality of second membrane frames 23 are located inside the second membrane tank 19.

[0053] A first branch gas regulating valve 24 is installed on the first purge branch pipe 20, and a second branch gas regulating valve 25 is installed on the second purge branch pipe 21. Both the first branch gas regulating valve 24 and the second branch gas regulating valve 25 are electrically connected to the programmable control system. The purge main pipe 9 blows purge gas into the first purge branch pipe 20 and the second purge branch pipe 21. The gas is blown out from the bottom of several first membrane frames 22 and several second membrane frames 23. The blown gas generates bubbles in the first membrane pool 18 or the second membrane pool 19. A large number of bubbles rise and cover several first membrane frames 22 and several second membrane frames 23, thereby timely removing the sludge accumulated on the membrane surface inside several first membrane frames 22 and several second membrane frames 23, preventing excessive sludge from affecting the membrane flux, and thus facilitating the continuous filtration of water by the membrane. The water is discharged from the center of the membrane through the outlet pipe 12. The first branch gas regulating valve 24 and the second branch gas regulating valve 25 work in conjunction with the frequency converter, which facilitates the adjustment of the purge air volume in the first purge branch pipe 20 and the second purge branch pipe 21 by the programmable control system.

[0054] A first branch air flow meter 26 is also installed on the first purge branch pipe 20, and a second branch air flow meter 27 is also installed on the second purge branch pipe 21. Both the first branch air flow meter 26 and the second branch air flow meter 27 are electrically connected to the programmable control system. The first branch air flow meter 26 and the second branch air flow meter 27 are used to monitor the air flow in the first purge branch pipe 20 and the second purge branch pipe 21 in real time, providing data support for air volume adjustment.

[0055] See Figure 1 The top of the first membrane tank 18 and the second membrane tank 19 are respectively equipped with a first liquid level sensor 28 and a second liquid level sensor 29 for detecting water level. The first liquid level sensor 28 and the second liquid level sensor 29 are both electrically connected to the programmable control system. The first liquid level sensor 28 and the second liquid level sensor 29 can collect the liquid level of the membrane module in the first membrane tank 18 and the second membrane tank 19, which facilitates the storage of the collected real-time data and the calculation of the average data over a period of time and feedback to the programmable control system. These data provide a comprehensive and accurate basis for subsequent air volume adjustment.

[0056] A first sludge concentration meter 30 and a second sludge concentration meter 31 for detecting sludge concentration data are respectively suspended below the liquid level of the first membrane tank 18 and the second membrane tank 19. Both the first sludge concentration meter 30 and the second sludge concentration meter 31 are electrically connected to the programmable control system. The first sludge concentration meter 30 and the second sludge concentration meter 31 will simultaneously report the sludge concentration of the membrane group corresponding to the first membrane tank 18 or the second membrane tank 19. After the programmable control system analyzes that the data collected by the sludge concentration meter has changed, it will start to adjust the purging air volume.

[0057] The bottom of the first membrane tank 18 and the second membrane tank 19 are respectively connected to a first temperature sensor 32 and a second temperature sensor 33 for detecting water temperature. Both the first temperature sensor 32 and the second temperature sensor 33 are electrically connected to the programmable control system. The water temperature fed back by the first temperature sensor 32 and the second temperature sensor 33 will also affect the adjustment of the purge air volume. In the summer when the temperature is high, the viscosity of water is low. At this time, the programmable control system will appropriately reduce the purge air volume to avoid over-aeration. In the winter when the temperature is low, the viscosity of water increases, the resistance encountered by the purge gas when rising in the water increases, and the rising speed of the bubbles slows down. In order to achieve the same membrane surface scouring effect as at room temperature, the programmable control system will automatically increase the purge air volume to enhance the shear force of the bubbles on the membrane surface and prevent pollutants such as sludge from depositing on the membrane surface.

[0058] See Figure 1 The outlet pipe 12 has a first product water pipe 34 and a second product water pipe 35. The first product water pipe 34 is connected to a plurality of first membrane frames 22 in the first membrane tank 18, and the second product water pipe 35 is connected to a plurality of second membrane frames 23 in the second membrane tank 19. The ends of the first product water pipe 34 and the second product water pipe 35 away from the first membrane frames 22 and the second membrane frames 23 are connected to a main product water pipe 36. A first pressure transmitter 37 and a second pressure transmitter 38 are respectively installed on the first product water pipe 34 and the second product water pipe 35. The first pressure transmitter 37 and the second pressure transmitter 38 are both electrically connected to a programmable control system. The first pressure transmitter 37 and the second pressure transmitter 38 can detect the pressure of the first product water pipe 34 and the second product water pipe 35 and calculate the transmembrane pressure difference.

[0059] The purge blower 8 is connected to a frequency converter (not shown in the figure). The speed of the purge blower 8 is adjusted by the frequency converter, so as to achieve precise control of the output air volume of the purge blower 8. The purge blower 8 is selected to meet the maximum purge air volume requirement of a single membrane tank.

[0060] See Figure 1In this embodiment, the programmable control system receives data from the first sludge concentration meter 30 and the second sludge concentration meter 31 and outputs it to the main gas regulating valve 14, the first branch gas regulating valve 24, the second branch gas regulating valve 25, and the purge blower 8 to regulate the purge airflow. When the sludge concentration increases, the purge airflow is automatically increased; when the sludge concentration decreases, the purge airflow is automatically decreased. When the programmable control system receives data from the first liquid level sensor 28 and the second liquid level sensor 29, if there is a liquid level imbalance between the membrane modules and the liquid level difference exceeds a set threshold, the purge airflow of the corresponding membrane module is automatically adjusted, which can effectively avoid uneven aeration caused by water level fluctuations. At the same time, the programmable control system can manually set the liquid level difference threshold to filter out small fluctuations in the liquid level. When the programmable control system calculates the transmembrane pressure difference based on data received from the first pressure transmitter 37, the second pressure transmitter 38, the first level sensor 28, and the second level sensor 29, if the transmembrane pressure difference exceeds a set threshold, the system appropriately increases the purge airflow to alleviate membrane fouling in accordance with the required gas-to-water ratio of the membrane module. When the transmembrane pressure difference returns to the normal range, the purge airflow is adjusted back to the normal level. When the programmable control system receives data from the first temperature sensor 32 or the second temperature sensor 33, in winter when the average water temperature is low, the lower water temperature increases the viscosity of the water, increasing the resistance encountered by the purge gas as it rises in the water, and slowing down the rising speed of the bubbles. In order to achieve the same membrane surface scouring effect as at room temperature, the programmable control system automatically increases the purge airflow to enhance the shear force of the bubbles on the membrane surface and prevent sludge and other pollutants from depositing on the membrane surface. In summer when the average water temperature is high, the system automatically increases the purge airflow. When the programmable control system receives a signal that the membrane module has stopped operating, it can calculate the number of membrane modules currently in operation and adjust the total air volume of the membrane system through the frequency converter. The total air volume of the membrane system will be adjusted again when the number of membrane modules in operation changes next time.

[0061] See Figure 1 In this embodiment, the coordinated action of the programmable control system with the first liquid level sensor 28, the second liquid level sensor 29, the first sludge concentration meter 30, the second sludge concentration meter 31, the first temperature sensor 32, and the second temperature sensor 33 can all be precisely adjusted through the mathematical model of the collected parameters and the purge air volume. At the same time, the parameters can be adjusted according to the actual use scenario when necessary, increasing the applicability and scalability of the aeration system.

[0062] See Figure 1 In this technical solution:

[0063] When the sludge concentration increases on average over a period of time, the programmable control system will automatically adjust the frequency of the purge fan 8 according to the preset mathematical model to increase the purge air volume, thereby removing the sludge accumulated on the membrane surface in a timely manner and preventing excessive sludge from affecting the membrane flux; when the sludge concentration decreases, the frequency of the purge fan 8 will be automatically reduced to decrease the purge air volume and avoid unnecessary energy consumption.

[0064] When a liquid level imbalance occurs between the membrane modules in the first membrane frame 22 and the membrane modules in the second membrane frame 23, and the liquid level difference exceeds a set threshold, the purge gas will automatically concentrate towards the membrane module with the lower liquid level. This causes a sharp increase in the purge gas volume of the membrane module with the lower liquid level, while the purge gas volume of the remaining membrane modules is insufficient. At this time, the first liquid level sensor 28 and the second liquid level sensor 29 will transmit signals to the programmable control system. The programmable control system will automatically adjust the opening of the first branch gas regulating valve 24 and the second branch gas regulating valve 25 of the corresponding membrane module to adjust the purge air volume of the membrane module, prevent uneven aeration, and ensure that each membrane module can work under suitable aeration conditions. At the same time, if the purge intensity cannot be adjusted properly after adjusting the opening of the first branch gas regulating valve 24 and the second branch gas regulating valve 25, the system will further adjust the operating frequency of the main gas regulating valve 14 and the purge fan 8.

[0065] When the programmable control system detects that the transmembrane pressure difference abnormally exceeds the set threshold, it will adjust the operating frequency of the purge fan 8 and the opening of the main gas regulating valve 14 to allow more air to enter the first membrane tank 18 or the second membrane tank 19 to alleviate membrane fouling. When the transmembrane pressure difference returns to the normal range, the purge air volume will be adjusted back to the normal level to ensure the stable operation of the membrane system. Generally, during the normal operation of the MBR membrane system, the transmembrane pressure difference of the membrane modules will gradually increase. The programmable control system will automatically and slowly increase the purge air volume according to the transmembrane pressure difference to ensure that each membrane module can operate under suitable aeration conditions.

[0066] When a membrane module stops operating, the programmable control system, upon receiving the stop signal, quickly adjusts the total airflow of the membrane system via the frequency converter and closes the corresponding branch gas regulating valve. Simultaneously, if necessary, it will adjust the opening of the first branch gas regulating valve 24 or the second branch gas regulating valve 25 of other membrane modules to prevent excessive total airflow from causing excessive purging intensity and unnecessary energy waste. Upon receiving a signal to resume operation of the membrane module, the system will uniformly adjust the opening of the first branch gas regulating valve 24 or the second branch gas regulating valve 25 and the main gas regulating valve 14, restoring the total airflow of the membrane system. This ensures that the purging airflow of the entire membrane system is reasonably controlled before and after the membrane modules start and stop.

[0067] When the purge air volume needs to be reduced to the lower limit of the purge blower 8, the gas vent valve 7, the main gas regulating valve 14, and the main air flow meter 15 will adjust their openings in conjunction. By precisely controlling the opening of each valve, the system can achieve the target air volume and ensure the normal operation of the membrane system.

[0068] See Figure 1 Throughout the entire work process:

[0069] First, by using real-time monitoring of multiple parameters and intelligent control strategies, the purge air volume can be precisely adjusted, avoiding the over-aeration phenomenon common in traditional aeration systems, significantly reducing energy consumption, improving energy utilization efficiency, reducing operating costs, and extending the service life of membrane modules. This ensures that the membrane tank can operate stably and efficiently under various complex working conditions, significantly improving the wastewater treatment effect.

[0070] Secondly, the operating parameters of the aeration equipment are dynamically adjusted according to the actual working conditions, which solves the problem of traditional aeration systems relying on manual experience for adjustment. It can adjust the aeration parameters in a timely manner when the working conditions of the membrane system change, reducing the degree of fouling of the membrane module. At the same time, the operating conditions of the membrane tank are analyzed in a data-driven manner, and the system parameters are adjusted through data to facilitate rapid processing and reduce maintenance difficulty and workload.

[0071] Furthermore, the aeration system has good versatility and scalability, and can adapt to MBR membrane tank systems of different scales and process requirements. It can be flexibly configured and adjusted according to actual needs, and is applicable to both new plants and renovations of old plants, with broad application prospects.

[0072] Finally, through real-time monitoring of multiple parameters and intelligent control strategies, the aeration system achieves precise adjustment of the purging air volume, which not only effectively reduces energy consumption but also extends the service life of the membrane modules, improves the operating efficiency and stability of the MBR membrane tank, significantly improves the wastewater treatment effect, and demonstrates good versatility and scalability, adapting to MBR membrane tank systems of different scales and process requirements.

[0073] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An aeration system for automatically adjusting the purge airflow of an MBR membrane system, characterized in that: Including programmable control systems for control purposes; The programmable control system is electrically connected to a sludge concentration meter (1), a pressure transmitter (2), a liquid level sensor (3), an air flow meter (4), a temperature sensor (5), a gas regulating valve (6), a gas venting valve (7), and a purge blower (8); The outlet of the purge blower (8) is connected to a purge main pipe (9). The end of the purge main pipe (9) away from the purge blower (8) is connected to a plurality of purge branch pipes (10). The ends of the purge branch pipes (10) away from the purge main pipe (9) are all connected to a plurality of membrane frames (11). The air outlets of the purge branch pipes (10) are located at the bottom of the membrane frames (11). The tops of the membrane frames (11) are all connected to water outlet pipes (12). The membrane frames (11) are adapted to membrane tanks (13). The sludge concentration meter (1), the liquid level sensor (3) and the temperature sensor (5) are all adapted to be installed in the membrane tank (13). The air flow meter (4), the gas regulating valve (6) and the gas venting valve (7) are all installed on the purge main pipe (9) or the purge branch pipe (10). The pressure transmitter (2) is installed on the water outlet pipe (12).

2. The aeration system for automatically adjusting the purge air volume of an MBR membrane system according to claim 1, characterized in that: The purge main pipe (9) is equipped with a main pipe gas regulating valve (14) for adjusting the total purge component, and the main pipe gas regulating valve (14) is electrically connected to the programmable control system.

3. The aeration system for automatically adjusting the purge air volume of an MBR membrane system according to claim 1, characterized in that: The purge main pipe (9) is equipped with a main pipe air flow meter (15) for detecting air flow, and the main pipe air flow meter (15) is electrically connected to the programmable control system.

4. An aeration system for automatically adjusting the purge air volume of an MBR membrane system according to claim 2, characterized in that: A secondary pipe (16) is connected to the main purge pipe (9) between the main gas regulating valve (14) and the purge blower (8). The gas vent valve (7) is installed on the secondary pipe (16) and is electrically connected to the programmable control system.

5. An aeration system for automatically adjusting the purge air volume of an MBR membrane system according to claim 1, characterized in that: The membrane pool has a first membrane pool (18) and a second membrane pool (19); The purge main pipe (9) is connected to a first purge branch pipe (20) and a second purge branch pipe (21) at one end away from the purge blower (8). The first purge branch pipe (20) is connected to a plurality of first membrane frames (22) at one end away from the purge main pipe (9). The second purge branch pipe (21) is connected to a plurality of second membrane frames (23) at one end away from the purge main pipe (9). The plurality of first membrane frames (22) are located inside the first membrane tank (18), and the plurality of second membrane frames (23) are located inside the second membrane tank (19). A first branch gas regulating valve (24) is installed on the first purge branch (20), and a second branch gas regulating valve (25) is installed on the second purge branch (21). Both the first branch gas regulating valve (24) and the second branch gas regulating valve (25) are electrically connected to the programmable control system.

6. An aeration system for automatically adjusting the purge air volume of an MBR membrane system according to claim 5, characterized in that: A first branch air flow meter (26) is also installed on the first purge branch pipe (20), and a second branch air flow meter (27) is also installed on the second purge branch pipe (21). Both the first branch air flow meter (26) and the second branch air flow meter (27) are electrically connected to the programmable control system.

7. An aeration system for automatically adjusting the purge air volume of an MBR membrane system according to claim 5, characterized in that: The top of the first membrane tank (18) and the second membrane tank (19) are respectively equipped with a first liquid level sensor (28) and a second liquid level sensor (29) for detecting water level. The first liquid level sensor (28) and the second liquid level sensor (29) are both electrically connected to the programmable control system.

8. An aeration system for automatically adjusting the purge air volume of an MBR membrane system according to claim 5, characterized in that: A first sludge concentration meter (30) and a second sludge concentration meter (31) for detecting sludge concentration data are respectively suspended below the liquid level of the first membrane tank (18) and the second membrane tank (19). The first sludge concentration meter (30) and the second sludge concentration meter (31) are both electrically connected to the programmable control system.

9. An aeration system for automatically adjusting the purge air volume of an MBR membrane system according to claim 5, characterized in that: The bottom of the first membrane tank (18) and the second membrane tank (19) are respectively connected to a first temperature sensor (32) and a second temperature sensor (33) for detecting water temperature. The first temperature sensor (32) and the second temperature sensor (33) are both electrically connected to the programmable control system.

10. An aeration system for automatically adjusting the purge air volume of an MBR membrane system according to claim 5, characterized in that: The outlet pipe (12) has a first water production pipe (34) and a second water production pipe (35). The first water production pipe (34) is connected to a plurality of first membrane frames (22) in the first membrane tank (18), and the second water production pipe (35) is connected to a plurality of second membrane frames (23) in the second membrane tank (19). The ends of the first water production pipe (34) and the second water production pipe (35) away from the first membrane frames (22) and the second membrane frames (23) are connected to a main water production pipe (36). A first pressure transmitter (37) and a second pressure transmitter (38) are respectively installed on the first water production pipe (34) and the second water production pipe (35). The first pressure transmitter (37) and the second pressure transmitter (38) are both electrically connected to the programmable control system.

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