MBR membrane tank foam prevention and control structure and treatment method

Abstract

The invention discloses an MBR membrane pool foam prevention and control structure which comprises a membrane pool body, a membrane frame is arranged in a membrane pool, an overflow groove is formed in one side of the membrane pool, the overflow groove is connected to a foam treatment box with a negative pressure device, and the treatment box is communicated with a water inlet groove through a return pipe; a defoaming component capable of reciprocating is arranged at the top of the membrane tank and is matched with a floating ball liquid level meter, a temperature sensor and a foam thickness sensor to realize intelligent monitoring. The core of the invention lies in that a graded defoaming treatment method is adopted, based on a response grade calculation formula, three defoaming modes of foundation, strengthening and emergency are dynamically switched according to foam thickness, temperature and liquid level height, and the foam is removed by adjusting the motion frequency and amplitude of a defoaming assembly and auxiliary aeration in combination with backflow after negative pressure collection and foam treatment of an overflow tank. And accurate foam prevention and control are realized. By means of the structure, the problems that an existing MBR membrane pool cannot dynamically adjust the defoaming strength according to the foam thickness, and foam with different thicknesses is difficult to efficiently and accurately prevent and control can be effectively solved.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a foam control structure and treatment method for MBR membrane tanks. Background Technology

[0002] MBR (Membrane Bioreactor), as a highly efficient wastewater treatment process combining membrane separation technology and biotechnology, is widely used in municipal, industrial, and reclaimed water sectors due to its advantages such as excellent effluent quality, small footprint, and low sludge load. During MBR membrane tank operation, factors such as nighttime microbial metabolic fluctuations and decreased surface tension of water under high temperatures (approximately 2-3 mN / m decrease in surface tension for every 10°C increase) can easily lead to the formation of a continuous and stable foam layer within the tank. If this foam is not treated promptly, it will not only affect the normal filtration efficiency of the membrane modules but may also overflow outside the tank as the liquid level rises, causing equipment contamination and environmental risks. Current foam control technologies for MBR membrane tanks suffer from a significant problem: a lack of simplistic defoaming strategies that fail to adapt to the dynamic changes in foam. For example, existing defoaming devices often employ mechanical structures with constant frequency and amplitude, such as fixed-speed agitator defoamers or single-stroke scraper defoaming components. When the foam thickness is small (<5cm), the fixed high-frequency motion wastes energy and easily disturbs the water, generating new foam. Conversely, when foam bursts (>10cm), the fixed low-frequency motion cannot quickly break up the thick foam layer, leading to continuous foam accumulation. Furthermore, traditional systems lack a tiered treatment logic based on foam thickness, applying the same intensity of defoaming measures regardless of foam quantity. In mild foam scenarios, overtreatment can damage the microbial environment within the membrane tank; in severe foam scenarios, insufficient treatment can exacerbate the risk of foam overflow. Finally, existing equipment relies heavily on preset time intervals for defoaming actions, rather than dynamic control based on real-time monitoring data. Even with foam sensors, precise matching of "foam thickness - defoaming intensity - motion parameters" is difficult to achieve, causing the defoaming process to lag behind the foam generation rate.

[0003] Therefore, the aforementioned "one-size-fits-all" defoaming mode makes it difficult for MBR membrane tanks to achieve efficient and precise control when faced with foam of different thicknesses and generation rates. This not only causes energy and equipment losses, but may also lead to a chain of problems such as accelerated membrane fouling and fluctuations in effluent water quality due to untimely foam treatment. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a foam control structure and treatment method for MBR membrane tanks, which can solve the problems of existing MBR membrane tank foam control adopting a fixed mode, lacking a graded response mechanism and insufficient linkage with monitoring, resulting in the inability to dynamically adjust the defoaming intensity according to the foam thickness, and making it difficult to efficiently and accurately control foam of different thicknesses.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an MBR membrane tank foam control structure, including a membrane tank, a membrane frame provided inside the membrane tank, a partition provided on one side of the membrane tank, a water inlet groove formed between the partition and the inner wall of one side of the membrane tank, and a water inlet pipe provided on the water inlet groove; An overflow trough is provided on the upper part of one side of the partition. The overflow trough is connected to the foam treatment box through a pipe. The foam treatment box is provided with a return pipe, which is connected to the inlet pipe on the inlet tank. The membrane tank is equipped with a float level gauge, a temperature sensor, and a foam thickness sensor, all of which are connected to the central controller.

[0006] In a preferred embodiment, an overflow baffle is provided on one side of the overflow channel, the overflow baffle is fixed by slots on both sides of the overflow channel, a rack is provided on one side of the overflow baffle, a gear meshing with the rack is provided on one side of the rack, and a drive device for driving the gear is provided.

[0007] In a preferred embodiment, the foam treatment box is equipped with a negative pressure pipe; The bottom of the foam treatment box is equipped with a collection trough, the inlet end of the return pipe is located on the collection trough, and a return pump is also provided on the return pipe.

[0008] In a preferred embodiment, the water inlet pipe on the water inlet tank is equipped with a tee, and the output end of the return pipe is connected to the tee.

[0009] In a preferred embodiment, a defoaming component is provided across the top of the membrane tank. The defoaming component includes guide grooves on both sides of the top surface of the membrane tank, sliders in the guide grooves, a vertical groove between the two sliders, lifting blocks in the vertical groove, an air pipe between the two lifting blocks, and a defoaming rod at the bottom of the air pipe. The defoaming rod is a hollow rod.

[0010] In a preferred embodiment, the air pipe is provided with an air inlet connector, and an air inlet hose is connected to the air inlet connector.

[0011] In a preferred embodiment, a second lead screw is provided in one of the guide grooves, the second lead screw passes through the slider, and the first lead screw is driven by a second motor; Another guide groove is provided with a smooth rod that passes through the slider.

[0012] In a preferred embodiment, a first lead screw that is vertical and passes through the lifting block is provided in the vertical groove, and a guide rod that is vertical and passes through the lifting block is also provided in the vertical groove; The first lead screw is driven by a first motor mounted on the slider.

[0013] In a preferred embodiment, the drive device for the gear, the first motor, and the second motor are all connected to the central controller.

[0014] The treatment method based on the above-mentioned MBR membrane tank foam control structure includes the following steps: 1) The temperature, foam thickness, and liquid level in the membrane tank are monitored in real time using a float level gauge, temperature sensor, and foam thickness sensor; 2) The float level gauge, temperature sensor and foam thickness sensor transmit the monitored raw data to the edge computing module. After data filtering, noise cancellation and format conversion preprocessing, the data is sent to the central controller through the 4G / 5G wireless communication network. 3) The central controller receives pre-processed temperature, foam thickness, and liquid level data. When any one of these data reaches a preset threshold, the system enters an early warning state. 4) The system performs defoaming treatment based on the warning signal issued by the central controller.

[0015] In a preferred embodiment, the foam thickness sensor is a laser sensor, and the formula for calculating the foam thickness is as follows: H = H1 - H2; In the above formula: H represents the foam thickness; H1 is the vertical distance from the laser sensor mounting position to the foam surface, in cm; H2 is the vertical distance from the installation position of the liquid level sensor to the surface of the liquid in the membrane tank, in cm.

[0016] In the preferred embodiment, step 4) of the defoaming treatment includes the following steps: 1) When the foam thickness is less than 5cm, the central controller controls the second motor to make the defoaming component reciprocate at a frequency of 1 time / minute to maintain the basic defoaming mode; 2) When the foam thickness is 5-10cm, the central controller controls the second motor to increase the movement frequency of the defoaming component to 2 times / minute, entering the enhanced defoaming mode; 3) When the foam thickness is greater than 10cm, the central controller controls the second motor to make the defoaming component move at a high frequency of 3 times / minute, and at the same time injects air through the air inlet hose to enter the emergency defoaming mode.

[0017] In a preferred embodiment, step 4) of the defoaming treatment further includes the following steps: 1) When the foam thickness exceeds the safety value, the central controller controls the gear drive to start, causing the foam to overflow into the overflow tank; 4) The foam enters the foam treatment box, where a negative pressure pipe draws out negative pressure and defoaming is achieved; 5) After the defoaming treatment is completed, the wastewater collected in the collection tank is returned to the membrane tank through the return pipe.

[0018] In a preferred embodiment, the defoaming mode is controlled based on the response level, which includes an early warning state, an intervention state, and an emergency state. In the early warning state, the basic defoaming mode is maintained; in the intervention state, the enhanced defoaming mode is entered; and in the emergency state, the emergency defoaming mode is entered. The response level is calculated using the following formula: Response level = α × (T - 25) / 10 + β × (H / Hmax) + δ × (L / Lmax); In the above formula: α, β, and δ are weight coefficients, α=0.3, β=0.4, and δ=0.3; T represents the actual temperature (°C), with the reference temperature set to 25°C. When T ≤ 25°C, this value is 0. H is the actual foam thickness (cm), and Hmax is the safe value for foam thickness. L is the actual liquid level height (m), and Lmax is the maximum safe liquid level height of the membrane tank. When the response level is ≤0.3, the system maintains the basic defoaming mode; When 0.3 < response level ≤ 0.6, the system enters enhanced defoaming mode; When the response level is greater than 0.6, the system enters emergency defoaming mode.

[0019] The silicone structural adhesive tensile bond strength test specimen molding die provided by the present invention has the following beneficial effects by adopting the above structure: (1) The foam layer thickness is monitored in real time by a foam thickness sensor. Combined with the response level calculation formula, the defoaming mode is divided into three levels: basic, enhanced and emergency. The defoaming intensity is dynamically matched with the foam thickness. When the foam thickness is <5cm, it operates with low-frequency motion to save energy. When the foam thickness is 5-10cm, the motion frequency is increased to enhance the breaking effect. When the foam thickness is >10cm, high-frequency motion and auxiliary aeration are started to work together. This solves the problem of low defoaming efficiency in the traditional fixed mode and improves the defoaming response speed. (2) The graded mode avoids the energy waste caused by the continuous high-frequency operation of traditional devices. When the foam thickness is small, the mechanical wear is reduced by low-frequency movement, which extends the service life of the defoaming components. At the same time, the excessive disturbance to the water in the membrane tank is reduced by precisely controlling the movement amplitude, which reduces the risk of damage to the microbial environment. (3) The graded defoaming and overflow tank are linked and controlled. When the emergency mode is entered, the negative pressure auxiliary collection is turned on simultaneously to increase the foam collection rate, effectively avoid foam overflow pollution, and the treated liquid is smoothly returned to the inlet tank through the return pipe to maintain the hydraulic balance of the membrane tank and reduce water waste. (4) By integrating temperature, liquid level and foam thickness monitoring data through the central controller, a closed-loop control of “monitoring-analysis-decision-execution” is realized. The defoaming mode can be automatically switched without manual intervention. It is suitable for nighttime or unattended scenarios, reducing operation and maintenance costs while improving the timeliness and reliability of foam control. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 This is a schematic diagram of a single-side elevation of the defoaming component of the present invention.

[0022] Figure 3 This is a top view of the overall structure of the defoaming component of the present invention.

[0023] Figure 4 This is a schematic diagram of the overflow baffle structure of the present invention.

[0024] Figure 5 This is a block diagram of the control section of the present invention.

[0025] In the diagram: 1. Membrane tank; 2. Membrane frame; 3. Partition plate; 4. Inlet tank; 5. Overflow tank; 6. Overflow baffle; 7. Rack; 8. Gear; 9. Foam output pipe; 10. Foam treatment box; 11. Negative pressure pipe; 12. Collection tank; 13. Return pipe; 14. T-junction; 15. Defoaming component; 16. Guide channel; 17. Slider; 18. Vertical channel; 19. Lifting block; 20. First lead screw; 21. Guide rod; 22. Second lead screw; 23. First motor; 24. Air pipe; 25. Air inlet connector; 26. Air inlet hose; 27. Defoaming rod; 28. Float level gauge; 29. ​​Temperature sensor; 30. Foam thickness sensor; 31. Second motor. Detailed Implementation

[0026] Example 1: like Figure 1-4 In the present invention, a foam control structure for an MBR membrane tank includes a membrane tank 1, a membrane frame 2 inside the membrane tank 1, a partition 3 on one side of the membrane tank 1, an inlet trough 4 formed between the partition 3 and the inner wall of one side of the membrane tank 1, and an inlet pipe on the inlet trough 4. An overflow trough 5 is provided on the upper part of one side of the partition 3. The overflow trough 5 is connected to the foam treatment box 10 through a pipe. The foam treatment box 10 is provided with a return pipe 13, which is connected to the inlet pipe on the inlet tank 4. The membrane tank 1 is equipped with a float level gauge 28, a temperature sensor 29, and a foam thickness sensor 30, all of which are connected to the central controller.

[0027] In a preferred embodiment, an overflow baffle 6 is provided on one side of the overflow trough 5. The overflow baffle 6 is fixed by slots on both sides of the overflow trough 5. A rack 7 is provided on one side of the overflow baffle 6. A gear 8 meshing with the rack 7 and a drive device for driving the gear 8 are provided on one side of the rack 7.

[0028] In a preferred embodiment, the foam treatment box 10 is equipped with a negative pressure pipe 11; The bottom of the foam treatment box 10 is provided with a collection trough 12, the input end of the return pipe 13 is located on the collection trough 12, and a return pump is also provided on the return pipe 13.

[0029] In a preferred embodiment, the water inlet pipe on the water inlet tank 4 is provided with a tee 14, and the output end of the return pipe 13 is connected to the tee 14.

[0030] In a preferred embodiment, a defoaming component 15 is provided across the top of the membrane tank 1. The defoaming component 15 includes guide grooves 16 on both sides of the top surface of the membrane tank 1. A slider 17 is provided in the guide groove 16. A vertical groove 18 is provided between the two sliders 17. A lifting block 19 is provided in the vertical groove 18. An air pipe 24 is provided between the two lifting blocks 19. A defoaming rod 27 is provided at the bottom of the air pipe 24. The defoaming rod 27 is a hollow rod.

[0031] In a preferred embodiment, the air pipe 24 is provided with an air inlet connector 25, and an air inlet hose 26 is connected to the air inlet connector 25.

[0032] In a preferred embodiment, a second lead screw 22 is provided in one of the guide grooves 16, the second lead screw 22 passes through the slider 17, and the first lead screw 20 is driven by a second motor 31; Another guide groove 16 is provided with a smooth rod that passes through the slider 17.

[0033] In a preferred embodiment, the vertical groove 18 is provided with a first lead screw 20 that is vertical and passes through the lifting block 19, and the vertical groove 18 is also provided with a guide rod 21 that is vertical and passes through the lifting block 19; The first lead screw 20 is driven by the first motor 23 mounted on the slider 17.

[0034] In a preferred embodiment, the drive device for the gear 8, the first motor 23, and the second motor 31 are all connected to the central controller.

[0035] Example 2: Based on Example 1, combined with Appendix Figure 5 The treatment method for controlling foam in MBR membrane tanks includes the following steps: 1) The temperature, foam thickness, and liquid level in membrane tank 1 are monitored in real time using float level gauge 28, temperature sensor 29, and foam thickness sensor 30; 2) The float level gauge 28, temperature sensor 29 and foam thickness sensor 30 transmit the monitored raw data to the edge computing module. After data filtering, noise cancellation and format conversion preprocessing, the data is sent to the central controller through the 4G / 5G wireless communication network. 3) The central controller receives pre-processed temperature, foam thickness, and liquid level data. When any one of these data reaches a preset threshold, the system enters an early warning state. 4) The system performs defoaming treatment based on the warning signal issued by the central controller.

[0036] In a preferred embodiment, the foam thickness sensor 30 is a laser sensor, and the formula for calculating the foam thickness is as follows: H = H1 - H2; In the above formula: H represents the foam thickness; H1 is the vertical distance from the laser sensor mounting position to the foam surface, in cm; H2 is the vertical distance from the installation position of the liquid level sensor to the surface of the liquid in the membrane tank, in cm.

[0037] In the preferred embodiment, step 4) of the defoaming treatment includes the following steps: 1) When the foam thickness is <5cm, the central controller controls the second motor 31 to make the defoaming component 15 reciprocate at a frequency of 1 time / minute to maintain the basic defoaming mode. 2) When the foam thickness is 5-10cm, the central controller controls the second motor 31 to increase the movement frequency of the defoaming component 15 to 2 times / minute, and enters the enhanced defoaming mode; 3) When the foam thickness is greater than 10cm, the central controller controls the second motor 31 to make the defoaming component 15 perform high-frequency motion 3 times / minute, and at the same time inject air through the air inlet hose 26 to enter the emergency defoaming mode.

[0038] In a preferred embodiment, step 4) of the defoaming treatment further includes the following steps: 1) When the foam thickness exceeds the safety value, the central controller controls the drive device of gear 8 to start, causing the foam to overflow into the overflow tank 5; 4) The foam enters the foam treatment box 10, and the negative pressure pipe 11 on the foam treatment box 10 draws negative pressure and achieves defoaming treatment; 5) After the defoaming treatment is completed, the wastewater collected in the collection tank 12 flows back to the membrane tank 1 through the return pipe 13.

[0039] In a preferred embodiment, the defoaming mode is controlled based on the response level, which includes an early warning state, an intervention state, and an emergency state. In the early warning state, the basic defoaming mode is maintained; in the intervention state, the enhanced defoaming mode is entered; and in the emergency state, the emergency defoaming mode is entered. The response level is calculated using the following formula: Response level = α × (T - 25) / 10 + β × (H / Hmax) + δ × (L / Lmax); In the above formula: α, β, and δ are weight coefficients, α=0.3, β=0.4, and δ=0.3; T represents the actual temperature (°C), with the reference temperature set to 25°C. When T ≤ 25°C, this value is 0. H is the actual foam thickness (cm), and Hmax is the safe value for foam thickness. L is the actual liquid level height (m), and Lmax is the maximum safe liquid level height of the membrane tank. When the response level is ≤0.3, the system maintains the basic defoaming mode; When 0.3 < response level ≤ 0.6, the system enters enhanced defoaming mode; When the response level is greater than 0.6, the system enters emergency defoaming mode.

[0040] Example 3: Based on Example 2, the system operation process is as follows: (1) Basic mode operation (response level ≤ 0.3): Taking 6:00 AM in summer as an example, the membrane tank monitoring data is as follows: Temperature T = 24℃ (≤ 25℃), foam thickness H = 2cm (Hmax = 8cm), liquid level height L = 2.2m (Lmax = 2.8m). Response level calculation: α×(T-25) / 10=0; β×(H / Hmax)=0.4×(2 / 8)=0.1; δ×(L / Lmax)=0.3×(2.2 / 2.8)≈0.236; Total response level = 0 + 0.1 + 0.236 = 0.336 ≈ 0.3 (rounded). Equipment Operation: The central controller controls the defoaming component 15 to reciprocate at a frequency of 1 time per minute. The height of the defoaming rod 27 is adjusted to 2 cm above the liquid level, and the movement amplitude is 1 / 4 of the membrane tank length. The overflow baffle 6 maintains its initial height, and the foam collection tank valve is closed. The sensor sampling frequency is 1 time per 30 seconds. At this time, the amount of foam in the membrane tank is small, and the low-frequency defoaming can effectively break up the initial foam without disturbing the operation of the membrane component.

[0041] (2) Enhanced mode operation (0.3 < response level ≤ 0.6) Taking 2 PM as an example, due to the high temperature, the monitoring data changed to: Temperature T=30℃, foam thickness H=4cm, liquid level height L=2.2m. Response level calculation: α×(T-25) / 10=0.3×(30-25) / 10=0.15; β×(H / Hmax)=0.4×(4 / 8)=0.2; δ×(L / Lmax)=0.3×(2.2 / 2.8)≈0.236; 0.3 < Total Response Level = 0.15 + 0.2 + 0.236 = 0.586 ≤ 0.6; Equipment Actions: The central controller increases the movement frequency of the defoaming component to 2 times / minute; the overflow baffle 6 remains in place, and the vacuum generator enters standby mode; the sensor sampling frequency is increased to 1 time / 15s. At this time, foam begins to accumulate. Strengthening defoaming can effectively suppress foam growth, while shortening the sampling interval to capture parameter changes in a timely manner.

[0042] (3) Emergency mode operation (response level > 0.6) Taking 22:00 on a summer night as an example, due to the active metabolism of microorganisms and the water temperature maintained at 32℃, the monitoring data are: temperature T=32℃, foam thickness H=9cm, and liquid level height L=2.6m. Response level calculation: α×(32-25) / 10=0.3×0.7=0.21; β × 9 / 8 = 0.4 × 1.125 = 0.45; δ×2.6 / 2.8≈0.3×0.929=0.279; The overall response level is calculated as 0.21 + 0.45 + 0.279 = 0.939 > 0.6. Equipment Operation: The defoaming component 15 moves at a high frequency of 3 times / minute, while simultaneously aerating through the defoaming rod 27 (air volume 2m³ / h). The central controller drives the gear 8 to rotate, raising the overflow baffle 6 and activating the valve on the foam output pipe 9 until the foam completely enters the foam treatment tank 10 and then closes it. Then, the vacuum pump connected to the negative pressure pipe 11 is started, and the foam is broken and separated under the negative pressure. The treated liquid returns to the inlet tank through the return pipe 13 and the tee 14. The return pump automatically starts and stops according to the liquid level in the collection tank. The system sends early warning information to the monitoring center to remind operators to pay attention to the operating status.

Claims

1. A foam control structure for an MBR membrane tank, comprising a membrane tank (1) and a membrane frame (2) disposed within the membrane tank (1), characterized in that: A partition (3) is provided on one side of the membrane tank (1), and a water inlet trough (4) is formed between the partition (3) and the inner wall of one side of the membrane tank (1). A water inlet pipe is provided on the water inlet trough (4). An overflow trough (5) is provided on the upper part of one side of the partition (3). The overflow trough (5) is connected to the foam treatment box (10) through a pipe. The foam treatment box (10) is provided with a return pipe (13). The return pipe (13) is connected to the inlet pipe on the inlet tank (4). The membrane tank (1) is equipped with a float level gauge (28), a temperature sensor (29) and a foam thickness sensor (30), all of which are connected to the central controller.

2. The MBR membrane tank foam control structure according to claim 1, characterized in that: An overflow baffle (6) is provided on one side of the overflow trough (5). The overflow baffle (6) is fixed by slots on both sides of the overflow trough (5). A rack (7) is provided on one side of the overflow baffle (6). A gear (8) meshes with the rack (7) and a drive device for driving the gear (8) is provided on one side of the rack (7).

3. The MBR membrane tank foam control structure according to claim 1, characterized in that: The foam treatment box (10) is equipped with a negative pressure pipe (11). The bottom of the foam treatment box (10) is provided with a collection trough (12), the inlet end of the return pipe (13) is located on the collection trough (12), and a return pump is also provided on the return pipe (13).

4. The MBR membrane tank foam control structure according to claim 3, characterized in that: The water inlet pipe on the water inlet tank (4) is provided with a tee (14), and the output end of the return pipe (13) is connected to the tee (14).

5. The MBR membrane tank foam control structure according to claim 2, characterized in that: The membrane tank (1) is provided with a defoaming component (15) spanning the top. The defoaming component (15) includes guide grooves (16) on both sides of the top surface of the membrane tank (1). A slider (17) is provided in the guide groove (16). A vertical groove (18) is provided between the two sliders (17). A lifting block (19) is provided in the vertical groove (18). An air pipe (24) is provided between the two lifting blocks (19). A defoaming rod (27) is provided at the bottom of the air pipe (24). The defoaming rod (27) is a hollow rod.

6. The MBR membrane tank foam control structure according to claim 5, characterized in that: The air pipe (24) is provided with an air inlet connector (25), and an air inlet hose (26) is connected to the air inlet connector (25).

7. The MBR membrane tank foam control structure according to claim 5, characterized in that: One of them The guide groove (16) is provided with a second lead screw (22), which passes through the slider (17). The first lead screw (20) is driven by a second motor (31). Another guide groove (16) is provided with a smooth rod that passes through the slider (17).

8. The MBR membrane tank foam control structure according to claim 7, characterized in that: The vertical groove (18) is provided with a first lead screw (20) that is vertical and passes through the lifting block (19), and the vertical groove (18) is also provided with a guide rod (21) that is vertical and passes through the lifting block (19). The first lead screw (20) is driven by the first motor (23) mounted on the slider (17).

9. The MBR membrane tank foam control structure according to claim 8, characterized in that: The drive device of the gear (8), the first motor (23) and the second motor (31) are all connected to the central controller.

10. A treatment method based on the foam control structure of an MBR membrane tank according to claims 1-9, characterized in that... Includes the following steps: 1) The temperature, foam thickness and liquid level in the membrane tank (1) are monitored in real time by means of a float level gauge (28), a temperature sensor (29) and a foam thickness sensor (30); 2) The float level gauge (28), temperature sensor (29) and foam thickness sensor (30) transmit the monitored raw data to the edge computing module. After data filtering, noise elimination and format conversion preprocessing, the data is sent to the central controller through the 4G / 5G wireless communication network. 3) The central controller receives pre-processed temperature, foam thickness, and liquid level data. When any one of these data reaches a preset threshold, the system enters an early warning state. 4) The system performs defoaming treatment based on the warning signal issued by the central controller.

11. The method for treating foam control structure in an MBR membrane tank according to claim 9, characterized in that: The foam thickness sensor (30) is a laser sensor, and the formula for calculating the foam thickness is as follows: H = H1 - H2; In the above formula: H represents the foam thickness; H1 is the vertical distance from the laser sensor mounting position to the foam surface, in cm; H2 is the vertical distance from the installation position of the liquid level sensor to the surface of the liquid in the membrane tank, in cm.

12. The method for treating foam control structure in an MBR membrane tank according to claim 10, characterized in that: In step 4), the defoaming treatment includes the following steps: 1) When the foam thickness is <5cm, the central controller controls the second motor (31) to make the defoaming component (15) reciprocate at a frequency of 1 time / minute to maintain the basic defoaming mode; 2) When the foam thickness is 5-10cm, the central controller controls the second motor (31) to increase the movement frequency of the defoaming component (15) to 2 times / minute, and enters the enhanced defoaming mode; 3) When the foam thickness is greater than 10cm, the central controller controls the second motor (31) to make the defoaming component (15) perform high-frequency motion 3 times / minute, and at the same time inject air through the air inlet hose (26) to enter the emergency defoaming mode.

13. The method for treating foam control structure in an MBR membrane tank according to claim 10, characterized in that: In step 4), the defoaming treatment further includes the following steps: 1) When the foam thickness exceeds the safety value, the central controller controls the drive device of gear (8) to start, so that the foam overflows into the overflow tank (5); 4) The foam enters the foam treatment box (10), and the negative pressure pipe (11) on the foam treatment box (10) draws negative pressure and achieves defoaming treatment; 5) After the defoaming treatment is completed, the sewage collected in the collection tank (12) is returned to the membrane tank (1) through the return pipe (13).

14. The method for treating foam control structure in an MBR membrane tank according to claim 12, characterized in that: The defoaming mode is controlled based on the response level, which includes a warning state, an intervention state, and an emergency state. In the warning state, the basic defoaming mode is maintained; in the intervention state, the enhanced defoaming mode is entered; and in the emergency state, the emergency defoaming mode is entered. The response level is calculated using the following formula: Response level = α × (T - 25) / 10 + β × (H / Hmax) + δ × (L / Lmax); In the above formula: α, β, and δ are weight coefficients, α=0.3, β=0.4, and δ=0.3; T represents the actual temperature (°C), with the reference temperature set to 25°C. When T ≤ 25°C, this value is 0. H is the actual foam thickness (cm), and Hmax is the safe value for foam thickness. L is the actual liquid level height (m), and Lmax is the maximum safe liquid level height of the membrane tank. When the response level is ≤0.3, the system maintains the basic defoaming mode; When 0.3 < response level ≤ 0.6, the system enters enhanced defoaming mode; When the response level is greater than 0.6, the system enters emergency defoaming mode.

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