An MBR membrane wastewater treatment equipment

Abstract

The application discloses a MBR membrane sewage treatment equipment, and relates to the technical field of water treatment.The sewage treatment efficiency is remarkably improved by the innovative air supply control and self-cleaning design.The bubble-free zone and the micro-bubble zone respectively control the air supply amount, realize efficient ammonia nitrogen nitrification and biological denitrification reaction, and the synergistic effect of the bubble-free membrane wire and the aeration membrane wire remarkably improves the oxygen utilization rate.The water suction zone component adopts a negative pressure adsorption mode, effectively traps bacteria and microorganisms through the filter membrane wire, and ensures the water quality of effluent water.In the self-cleaning process, the equipment utilizes the synergistic effect of the high-low pressure airflow pulse and the bubbles and water flow, enhances the cleaning effect of the membrane wire, prolongs the service life of the equipment, and improves the sewage treatment efficiency and the operation stability of the equipment as a whole.

Description

Technical Field

[0001] This invention belongs to the field of water treatment technology, specifically, it relates to MBR membrane wastewater treatment equipment. Background Technology

[0002] Most of the nitrogen in industrial wastewater originates from nitrogen gas in the air. For example, coal (or coke), water, and air are gasified into water gas, whose main components are H2 and CO. CO reacts with H2O to produce H2 and CO2. H2 and N2 can synthesize ammonia (NH3), an important chemical raw material that can be used to produce urea, ammonium carbonate, ammonium sulfate, ammonia water, and other products, and further synthesize organic matter. The wastewater discharged during this process contains a certain concentration of nitrogen, mainly ammonia nitrogen, organic nitrogen, and nitrate nitrogen. Discharging this into the environment without treatment will cause significant pollution.

[0003] Organic nitrogen needs to be converted into ammonia nitrogen through hydrolysis before further treatment. High-concentration nitrates can be recovered through concentration, evaporation, and crystallization, while low-concentration nitrates can be converted into nitrogen gas through biochemical denitrification and released from the water back into the atmosphere.

[0004] High concentrations (greater than 1000 mg / L) of ammonia nitrogen can be recovered by stripping, and absorbed by sulfuric acid, hydrochloric acid, or water to produce ammonium sulfate, ammonium carbonate, or ammonia water. When the concentration is below 1000 mg / L, ammonia nitrogen recovery is not very meaningful, and advanced oxidation or biochemical methods are required to convert it into nitrogen gas.

[0005] Biological nitrogen removal utilizes the natural nitrogen cycle and controls it artificially. First, nitrogenous organic matter in wastewater is hydrolyzed into ammonia nitrogen. Then, under aerobic conditions, it is converted into nitrate nitrogen by nitrifying bacteria; this stage is called aerobic nitrification. Subsequently, under anoxic conditions, nitrate nitrogen is reduced to nitrogen gas by denitrifying bacteria; this stage is called anoxic denitrification. The entire biological nitrogen removal process involves the decomposition, oxidation, and reduction of nitrogen, with energy derived from organic matter. Factors affecting nitrogen removal efficiency during nitrification and denitrification include temperature, dissolved oxygen, pH, and carbon source. Traditional biological nitrogen removal systems consist of an aerobic nitrification tank, an anoxic denitrification tank, and a sedimentation tank.

[0006] However, traditional biological nitrogen removal methods have several drawbacks, including slow growth of nitrifying bacteria, the need for long sludge ages leading to large tank sizes and high construction costs; system susceptibility to shocks, causing filamentous bacteria bulking and difficulties in separation in sedimentation tanks; and easy loss of nitrifying and denitrifying bacteria. Furthermore, pre-denitrification processes require high reflux ratios to reduce external carbon sources, but higher reflux ratios result in higher energy consumption. Although biological nitrogen removal has lower operating costs, the low dissolved oxygen efficiency of traditional and new aeration methods leads to high aerobic requirements and higher operating costs for treating high-concentration ammonia nitrogen wastewater.

[0007] In view of this, the present invention is proposed. Summary of the Invention

[0008] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0009] An MBR membrane wastewater treatment device includes:

[0010] support;

[0011] Bubble-free components;

[0012] The bubble-free zone component is located on the inner wall of the support and is used to provide oxygen for the nitrification of ammonia nitrogen in wastewater after air is introduced. A biofilm frame is provided in the bubble-free zone formed by the bubble-free zone component.

[0013] Water absorption zone components;

[0014] The water absorption zone components are symmetrically arranged on both sides of the bubble-free zone components, and are used to filter and retain bacteria and microorganisms in the water before it is discharged.

[0015] Microbubble region components;

[0016] The microbubble zone components are staggered within the water absorption zone components for wastewater aeration treatment.

[0017] Water pump;

[0018] The water pump is connected to the suction zone assembly via a pumping pipe to provide negative pressure suction.

[0019] Cleaning components;

[0020] The cleaning component is slidably disposed on the surface of the bracket and is used for cleaning the bubble-free zone component, the water-absorbing zone component, and the microbubble zone component;

[0021] One end of the cleaning assembly is connected to two hoses, and the top ends of the two hoses are connected to a T-junction.

[0022] Pressure tank;

[0023] The pressure tank is connected to the bubble-free zone component through the first air supply pipe, the pressure tank is connected to the microbubble zone component through the second air supply pipe, the pressure tank is connected to the cleaning component through the third air supply pipe, and the three-way pipe is connected to the pressure tank through the third air supply pipe.

[0024] Several air pumps are connected to one side of the pressure tank;

[0025] The surfaces of the bubble-free zone component, the microbubble zone component, and the water-absorbing zone component are all provided with uprights that are fixed to the support.

[0026] Preferably, the bubble-free zone component includes a first aeration pipe, the surface of which is connected to a plurality of first branch pipes, the bottom end of which is connected to a first square, and the first square is provided with or without.

[0027] Preferably, the cleaning assembly includes a frame that moves vertically on the surface of the support, and wheel frames are provided at the four corners of the inner wall of the frame, the wheel frames cooperating to limit the rolling at the four corners of the support;

[0028] The frame has airtight chambers fixed symmetrically on both sides. One end of each airtight chamber is connected to a transfer pipe. The opposite sides of the two airtight chambers are connected to several bidirectional spray bars and two unidirectional spray bars. A pressure reducing valve is provided at one end of the transfer pipe. Solenoid pulse valves are installed at one end of each of the bidirectional spray bars and the two unidirectional spray bars. The solenoid pulse valves are located on the inner wall of the corresponding airtight chamber.

[0029] Preferably, the water absorption zone assembly includes a suction pipe connected to a water extraction pipe, with merging pipes symmetrically connected to both ends of the suction pipe. Several second branch pipes are connected to the surfaces of the two merging pipes, and a second frame is connected to each of the two second branch pipes. Filter membrane fibers are disposed within the second frame.

[0030] Preferably, each of the plurality of bidirectional spray bars and the two unidirectional spray bars includes a guide shell, the inner wall of the guide shell is provided with a spray pipe, the surface of the guide shell is provided with a constriction orifice, the surface of the spray pipe is provided with a plurality of nozzles facing the constriction orifice, and the surface of the guide shell is provided with a siphon orifice.

[0031] Preferably, the microbubble zone component includes a second aeration pipe connected to a second air supply pipe, one end of the second aeration pipe is connected to two branch pipes, the surfaces of the two branch pipes are connected to a third branch pipe, and the two third branch pipes are connected to a third frame, in which aeration membrane filaments are disposed.

[0032] Preferably, a main control valve is provided at the connection points between the first air supply pipe, the second air supply pipe, and the third air supply pipe and the pressure tank;

[0033] One side of the pressure tank is connected to the third air supply pipe via a backflush pipe.

[0034] Preferably, the bubble-free membrane fiber, the filter membrane fiber, and the aeration membrane fiber all comprise hollow fiber MBR membranes, the surface pore size of the aeration membrane fiber includes a pore size < 0.4 μm, and the pore size of the filter membrane fiber includes a pore size < 0.1 μm.

[0035] Preferably, the surfaces of the first air supply pipe, the water pumping pipe, the second air supply pipe, the third air supply pipe, and the backflush pipe are all equipped with flow control valves, the surface of the water pumping pipe is equipped with a pressure gauge and a flow meter, and a pressure protector is provided on one side of the pressure tank.

[0036] Preferably, the nozzles of the unidirectional and bidirectional spray bars are oriented diagonally downwards by an angle of 5-60 degrees.

[0037] Beneficial effects:

[0038] This solution integrates the bubble-free zone component, microbubble zone component, biofilm support, and water absorption zone component. The bubble-free zone component's design ensures effective contact between air and the biofilm support in the wastewater, significantly improving oxygen utilization during biological denitrification to over 90%, thus dramatically increasing denitrification efficiency. Furthermore, the oxygen supply in the bubble-free zone is controlled to be lower than in the microbubble zone, allowing for precise adjustment of the wastewater treatment process and achieving a gradient distribution from aerobic to anoxic conditions, further optimizing denitrification. Secondly, the microbubble zone component has a pore size of less than 0.4 μm and a large air volume, increasing oxygen utilization to over 60%. Simultaneously, the small bubble size in the microbubble zone provides better mixing, significantly improving oxygen utilization compared to traditional microporous aerators.

[0039] The water absorption zone component utilizes filter membrane fibers with a pore size of less than 0.1μm, effectively trapping bacteria and microorganisms to ensure excellent effluent quality. Combined with negative pressure suction technology, it achieves highly efficient wastewater filtration. Finally, the cleaning component is designed to achieve multi-frequency oscillating cleaning through a combination of oscillating airflow and high / low pressure variations, controlled by an electromagnetic pulse valve. This effectively cleans dirt of different particle sizes. Furthermore, the buoyancy of the airtight chamber and the sliding of the wheel frame enable an automated up-and-down movement cleaning process, improving the equipment's cleaning efficiency and effectiveness.

[0040] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0041] In the attached diagram:

[0042] Figure 1 This is a schematic diagram of the system structure of the present invention;

[0043] Figure 2 This is a three-dimensional structural schematic diagram of the present invention;

[0044] Figure 3 This is a three-dimensional structural schematic diagram of the present invention from another perspective;

[0045] Figure 4 This is a schematic diagram of the structure of the cleaning component of the present invention located on the surface of the support;

[0046] Figure 5 This is a schematic diagram of the cross-sectional structure of the cleaning component of the present invention;

[0047] Figure 6 This is a schematic diagram of the cross-section of the bidirectional nozzle of the present invention;

[0048] Figure 7 This is a schematic diagram of the cross-section of the unidirectional nozzle of the present invention;

[0049] Figure 8 This is a schematic diagram of the installation state of the water absorption zone component of the present invention;

[0050] Figure 9 This is a schematic diagram of the installation state of the microbubble region component of the present invention;

[0051] Figure 10 This is a schematic diagram of the installation state of the bubble-free component of the present invention;

[0052] Figure 11 This is an exploded structural diagram of the water-absorbing zone component, the bubble-free zone component, and the microbubble zone component of the present invention.

[0053] In the diagram: 1. Support frame; 2. Biofilm frame; 3. Bubble-free zone assembly; 31. First aeration pipe; 32. First branch pipe; 33. First square frame; 34. Bubble-free membrane fiber; 4. Water absorption zone assembly; 41. Suction pipe; 42. Combination pipe; 43. Second branch pipe; 44. Second square frame; 45. Filter membrane fiber; 5. Microbubble zone assembly; 51. Second aeration pipe; 52. Diversion pipe; 53. Third branch pipe; 54. Third square frame; 55. Aeration membrane fiber; 6. Cleaning assembly; 61. Frame; 62. Wheel frame; 63. Airtight chamber; 4. Transfer pipe; 65. Pressure reducing valve; 66. Electromagnetic pulse valve; 67. One-way spray boom; 68. Two-way spray boom; 681. Guide shell; 682. Spray pipe; 683. Siphon inlet; 684. Nozzle; 685. Constriction port; 7. Hose; 8. T-connector; 9. Main control valve; 10. Stand; 11. First air supply pipe; 12. Water supply pipe; 13. Second air supply pipe; 14. Third air supply pipe; 15. Backflush pipe; 16. Pressure tank; 17. Air pump; 18. Pressure protector; 19. Pressure gauge; 20. Water pump; 21. Flow meter. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention.

[0055] like Figures 1 to 11 As shown, an MBR membrane wastewater treatment device includes a support frame 1;

[0056] The bubble-free zone component 3 is located on the inner wall of the support 1 and is used to provide oxygen for the nitrification of ammonia nitrogen in wastewater after air is introduced. A biofilm frame 2 is installed in the bubble-free zone formed by the bubble-free zone component 3.

[0057] The water absorption zone component 4 is symmetrically arranged on both sides of the bubble-free zone component 3, and is used to filter and retain bacteria and microorganisms before water is discharged.

[0058] Microbubble zone components 5 are staggered within water absorption zone components 4 for wastewater aeration treatment;

[0059] The water pump 20 is connected to the suction zone assembly 4 through the water pumping pipe 12 to provide negative pressure suction.

[0060] The cleaning component 6 is slidably disposed on the surface of the bracket 1 for cleaning the bubble-free zone component 3, the water-absorbing zone component 4, and the microbubble zone component 5;

[0061] One end of the cleaning component 6 is connected to two hoses 7, and the top ends of the two hoses 7 are connected to a three-way pipe 8.

[0062] Pressure tank 16 is connected to bubble-free zone component 3 through first air supply pipe 11, pressure tank 16 is connected to microbubble zone component 5 through second air supply pipe 13, pressure tank 16 is connected to cleaning component 6 through third air supply pipe 14, and three-way pipe 8 is connected to pressure tank 16 through third air supply pipe 14.

[0063] Several air pumps 17 are connected to one side of the pressure tank 16;

[0064] The surfaces of the bubble-free zone component 3, the microbubble zone component 5, and the water-absorbing zone component 4 are all provided with uprights 10 that are fixed to the support 1.

[0065] The bubble-free zone component 3, the microbubble zone component 5, and the water absorption zone component 4 respectively form the bubble-free zone, the microbubble zone, and the water absorption zone. This modular design greatly facilitates the flexibility and adaptability of the equipment. Each component can be replaced or upgraded independently, allowing for adjustments in different application scenarios. For example, when treating different types of wastewater, the configuration of the microbubble zone and the bubble-free zone can be adjusted to meet different treatment requirements. The modular design also simplifies the equipment maintenance process, as each component can be inspected and maintained independently without requiring a system shutdown. This design improves equipment availability and maintenance efficiency, reducing downtime and maintenance costs.

[0066] The bubble-free zone component 3 includes a first aeration pipe 31, the surface of which is connected to a plurality of first branch pipes 32, the bottom end of which is connected to a first frame 33, and the first frame 33 is provided with a bubble 34.

[0067] The first frame 33 fixes the bubble-free filament 34 and connects the two ends.

[0068] The cleaning assembly 6 includes a frame 61 that moves vertically on the surface of the support 1. Each of the four corners of the inner wall of the frame 61 is provided with a wheel frame 62, which rolls at the four corners of the support 1 in a limited manner.

[0069] By setting the wheel frame 62, the wheel frame 62 can be limited to roll on the surface of the support 1, which can play a good guiding role in the lifting and lowering process of the frame 61 and ensure the stability of movement.

[0070] Airtight chambers 63 are symmetrically fixed on both sides of the frame 61. One end of the airtight chamber 63 is connected to a transfer pipe 64. Several bidirectional spray bars 68 and two unidirectional spray bars 67 are connected to the opposite surfaces of the two airtight chambers 63. A pressure reducing valve 65 is provided at one end of the transfer pipe 64. Solenoid pulse valves 66 are installed at one end of the several bidirectional spray bars 68 and the two unidirectional spray bars 67. The solenoid pulse valves 66 are located on the inner wall of the corresponding airtight chamber 63.

[0071] The water absorption zone component 4 includes a suction pipe 41 connected to the suction pipe 12. Both ends of the suction pipe 41 are symmetrically connected to a confluence pipe 42. The surfaces of the two confluence pipes 42 are connected to a number of second branch pipes 43. The two second branch pipes 43 are connected to a second frame 44. A filter membrane filament 45 is disposed in the second frame 44.

[0072] Several bidirectional spray bars 68 and two unidirectional spray bars 67 each include a guide shell 681. A spray pipe 682 is provided through the inner wall of the guide shell 681. A constriction port 685 is provided on the surface of the guide shell 681. Several nozzles 684 facing the constriction port 685 are provided on the surface of the spray pipe 682. A siphon port 683 is opened on the surface of the guide shell 681.

[0073] The siphon 683 can spray water in a designated direction with the airflow, generating a guiding force. As a result, the water from the outside enters the guide shell 681 through the siphon 683 and flows with the airflow.

[0074] This solution utilizes the synchronous or differential frequency oscillation modes of the electromagnetic pulse valves 66 to perform targeted cleaning of different types of dirt. In synchronous oscillation mode, multiple electromagnetic pulse valves 66 operate simultaneously, generating a uniform oscillation frequency to clean loosely attached dirt. In differential frequency oscillation mode, adjacent electromagnetic pulse valves 66 operate alternately at different frequencies, and the resulting frequency differences effectively remove more firmly attached dirt. Through this differential frequency oscillation technology, the equipment can more accurately address different dirt characteristics, significantly improve cleaning efficiency, extend the membrane fiber cleaning cycle, and ensure that the equipment maintains high-efficiency filtration performance during long-term operation.

[0075] The microbubble zone component 5 includes a second aeration pipe 51 connected to the second air supply pipe 13. One end of the second aeration pipe 51 is connected to two branch pipes 52. The surfaces of the two branch pipes 52 are connected to third branch pipes 53. The two third branch pipes 53 are connected to a third frame 54. An aeration membrane filament 55 is disposed in the third frame 54.

[0076] A main control valve 9 is provided at the connection points of the first air supply pipe 11, the second air supply pipe 13, and the third air supply pipe 14 with the pressure tank 16.

[0077] One side of the pressure tank 16 is connected to the third air supply pipe 14 via the backflush pipe 15.

[0078] The bubble-free membrane fiber 34, the filter membrane fiber 45, and the aeration membrane fiber 55 all include hollow fiber MBR membranes. The surface pore size of the aeration membrane fiber 55 includes pores with a diameter of <0.4μm, and the surface pore size of the filter membrane fiber 45 includes pores with a diameter of <0.1μm.

[0079] The surfaces of the first air supply pipe 11, the water pumping pipe 12, the second air supply pipe 13, the third air supply pipe 14, and the backflush pipe 15 are all equipped with flow control valves. The surface of the water pumping pipe 12 is equipped with a pressure gauge 19 and a flow meter 21. A pressure protector 18 is installed on one side of the pressure tank 16.

[0080] The flow control valve can control the flow rate and even completely control the on / off state. By setting pressure gauge 19 and flow meter 21 to monitor the relationship between water flow velocity and pressure, the clogging status of filter membrane fiber 45 can be understood.

[0081] The pressure protector 18 detects the pressure data inside the pressure tank 16 and, when necessary, feeds back and starts the corresponding number of air pumps 17.

[0082] The nozzles 685 of the unidirectional spray bar 67 and the bidirectional spray bar 68 are oriented diagonally downwards with an angle ranging from 5 to 60 degrees.

[0083] The downward-sloping design allows the unidirectional spray bar 67 and the bidirectional spray bar 68 to generate an upward reaction force, enabling them to move upward in conjunction with buoyancy.

[0084] Traditional processing methods have the following problems:

[0085] Nitrifying bacteria grow slowly and require sufficient sludge age, resulting in large tanks and high construction costs. Furthermore, the biological system is susceptible to shocks, causing filamentous bacteria to swell, making separation in the sedimentation tank difficult, and leading to the easy loss of both nitrifying and denitrifying bacteria.

[0086] Currently, to utilize carbon sources in wastewater, a pre-denitrification process is often adopted to reduce the amount of external carbon source added. Therefore, the nitrified liquid in the aerobic nitrification tank needs to be returned to the anoxic denitrification tank. Theoretically, the return ratio r = η / (1-η), where η is the denitrification efficiency. The higher the efficiency, the larger the return ratio, and the greater the energy consumption required.

[0087] Compared to other methods, biochemical denitrification is still the method with the lowest operating cost. The main operating cost is the oxygen required to oxidize ammonia nitrogen into nitrate nitrogen. The oxygen mainly comes from air, which needs to be compressed and then introduced into the wastewater for oxygenation and aeration. Currently, the dissolved oxygen efficiency of oxygenation devices is generally 15-30%, which wastes a lot (70-85%) of compressed air.

[0088] Theoretically, 1g of ammonia nitrogen requires 4.6g of oxygen. Traditional aeration methods generally have an oxygen dissolution efficiency of less than 30%, and even the new aeration methods have an oxygen dissolution efficiency of no more than 50%. This results in a large amount of aerobic wastewater with high concentrations of ammonia nitrogen and high operating costs.

[0089] Addressing the problems inherent in traditional treatment methods, this solution replaces the secondary sedimentation tank at the end of the traditional biological denitrification process with an MBR membrane. This increases the sludge concentration to 3-4 times that of traditional methods by retaining activated sludge, significantly reducing construction costs and land area. Its efficient retention of suspended solids ensures stable effluent quality, even under conditions of filamentous bacteria expansion. The hollow fiber membrane design provides efficient oxygen diffusion, with an oxygen utilization rate exceeding 90%, significantly improving ammonia nitrogen nitrification efficiency. The design of its microbubble zone and water absorption zone enhances oxygen utilization and water quality assurance. Combined with the biofilm frame 2 in the non-bubble zone, it ensures good adhesion of microorganisms.

[0090] Based on the traditional method, this solution goes a step further by pressurizing the pressure tank 16 with the air pump 17 during use, maintaining its internal pressure at a specified value. Then, air is supplied to the bubble-free zone component 3 through the first air supply pipe 11 and to the microbubble zone component 5 through the second air supply pipe 13. Under the control of the flow control valves, the air supply to the bubble-free zone is kept lower than that to the microbubble zone. After air is introduced into the first aeration pipe 31 of the bubble-free zone component 3, it enters the corresponding first frame 33 through the first branch pipe 32. Under the diffusion of the first frame 33, the air enters the densely connected bubble-free membrane filaments 34. The bubble-free membrane filaments 34 have no bubbles on their surface. Air is introduced from the middle through the first frame 33. The air diffuses out through the membrane filaments and mixes with the sewage, so that the utilization rate of oxygen in the air in the biological denitrification process reaches more than 90%.

[0091] Meanwhile, the biofilm frame 2 set in the bubble-free zone can come into contact with the sewage. The biofilm frame 2 has a certain thickness. The area close to the membrane filaments comes into contact with the diffused oxygen, which is the aerobic zone. The area further away is where the oxygen is consumed, which is the anoxic zone. The process from aerobic to anoxic is used for the denitrification reaction.

[0092] Air is introduced into the microbubble zone component 5, and then flows through the second aeration pipe 51 into two branch pipes 52. From there, the air flows through the two branch pipes 52 into several third branch pipes 53, and then through the third branch pipes 53 into a third frame 54. Within the third frame 54, the air enters the middle of the aeration membrane filaments 55. The microbubble zone has a pore size <0.4μm, a higher airflow rate than the non-bubble zone, and smaller bubble size, allowing for an oxygen utilization rate of over 60% during the denitrification reaction. It also serves a stirring function. (Currently, commonly used microporous aerators typically have a pore size >500μm, and their oxygen utilization rate is generally below 30%).

[0093] Meanwhile, the water pump 20 creates a negative pressure in the water suction area component 4 through the water suction pipe 12. The suction pipe 41 of the water suction area component 4 creates a negative pressure in the second frame 44 through the confluence pipe 42 and the second branch pipe 43. The filter membrane filament 45 connected to the second frame 44 filters the sewage. Its pore size is <0.1μm. The negative pressure suction can effectively intercept bacteria and microorganisms with a particle size distribution within 0.1μm, which can ensure excellent water quality. After the water is pumped out, the flow rate meter 21 and the pressure meter 19 detect the pressure and flow rate changes of the negative pressure. When the pressure rises to a certain level and the flow rate continues to decrease to the threshold, a self-cleaning operation is performed.

[0094] During the cleaning process, by opening the flow control valves on the surfaces of the third air supply pipe 14 and the return pipe, and simultaneously closing the flow control valve on the surface of the water suction pipe 12, high-pressure gas first enters the water absorption zone component 4 through the return pipe and the water suction pipe 12. Within the filter membrane fiber 45, the pressure changes from negative to increased, rapidly replenishing the gas pressure in the pressure tank 16 (reducing the air supply to the microbubble zone component 5 during this process). Once the gas pressure reaches the cleaning pressure, the third air supply pipe 14 is connected to the three-way pipe 8. The three-way pipe 8 then injects gas into the cleaning component 6 through the hose 7. The airflow first enters the two airtight chambers 63 through two adapter pipes 64. One airtight chamber 63 has a pressure reducing valve 65, ensuring that the gas pressure entering it is lower than that in the other airtight chamber 63. 3. The electromagnetic pulse valve 66 installed in the high-pressure airtight chamber 63 controls the ejection frequency of the high-pressure air inside. The air in the low-pressure airtight chamber 63 directly enters the bidirectional spray bar 68 and the unidirectional spray bar 67 and is ejected diagonally downward. Based on the continuous and rapid airflow from the low-pressure airtight chamber 63 on one side, bubbles are formed. The high-pressure gas in the high-pressure airtight chamber 63 forms an airflow pulse under the action of the electromagnetic pulse valve 66. Combined with the continuously ejected gas, it forms an oscillation wave. Bubbles are ejected during the vibration. Water enters through the siphon port 683 under the siphon effect. It is guided to flow with the direction of the airflow, causing the filter membrane fiber 45, the bubble-free membrane fiber 34 and the aeration membrane fiber 55 to vibrate and rub against each other locally. Under the action of bubbles and water flow, local rapid cleaning is carried out.

[0095] During the cleaning process, the two airtight chambers 63 are filled with air, which greatly offsets the weight of the frame 61 with its buoyancy. The downward-spraying airflow and guided water flow provide an upward force, which, combined with the buoyancy of the airtight chambers 63, causes the frame 61 to roll continuously upwards on the surface of the support 1 via the wheel frame 62. Simultaneously, the hose 7 remains connected as it bends. Once the top is reached, the air supply is shut off, and the frame returns to its original position. This method allows for thorough cleaning while also enabling localized cleaning as needed.

[0096] This method combines continuous air supply with oscillating air supply to form oscillating bubbles with varying high and low pressures. Simultaneously, when needed, the electromagnetic pulse valves 66 can operate at the same or different frequencies. In the same-frequency state, the oscillations of multiple electromagnetic pulse valves 66 are synchronized. In the differential-frequency state, adjacent electromagnetic pulse valves 66 alternately oscillate, controlling the vibration state of the filter membrane fibers 45 during the cleaning process. Different oscillation states result in different cleaning effects on dirt of different particle sizes. Its unique cleaning component 6 design utilizes the combination of oscillating airflow and high and low pressure variations, controlled by the electromagnetic pulse valves 66 to form multi-frequency oscillations, achieving efficient cleaning of the filter membrane fibers 45, bubble-free membrane fibers 34, and aerated membrane fibers 55. Compared to traditional cleaning methods, this solution not only achieves precise cleaning at different frequencies and effectively treats deposits of different particle sizes, but also makes the cleaning process more continuous and efficient through an automated sliding design. Especially when treating complex wastewater, the automated oscillation and bubble cleaning mechanism of the cleaning component significantly reduces the frequency of manual maintenance, improving equipment operating efficiency and service life. This innovative cleaning method significantly improves the overall performance of wastewater treatment systems.

[0097] This MBR membrane wastewater treatment equipment achieves multi-level wastewater treatment effects by precisely controlling the air supply and pressure of each component. The combination of the bubble-free membrane fibers 34 in the bubble-free zone component 3 and the aeration membrane fibers 55 in the microbubble zone component 5 significantly improves the oxygen utilization rate of ammonia nitrogen nitrification and biological denitrification processes in wastewater, reaching over 90% and 60% respectively. Furthermore, the filter membrane fibers 45 in the water absorption zone component 4 effectively improve the effluent quality by adsorbing bacteria and microorganisms through negative pressure. During the self-cleaning process, the synergistic effect of high and low pressure airflow pulses and the interaction between air bubbles and water flow enhances the cleaning effect of the filter membrane fibers 45, bubble-free membrane fibers 34, and aeration membrane fibers 55, extending the service life of the equipment. This innovative design not only improves wastewater treatment efficiency but also reduces maintenance costs, demonstrating significant practical value and technological advantages.

[0098] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An MBR membrane sewage treatment apparatus characterized by comprising: Include: Support (1); Bubble-free zone assembly (3); The bubble-free zone assembly (3) is arranged on the inner wall of the support (1) and is used for providing oxygen for nitrification of ammonia nitrogen in sewage after air is introduced. A biofilm rack (2) is arranged in the bubble-free zone formed by the bubble-free zone assembly (3); The bubble-free zone assembly (3) comprises a first aeration pipe (31), the surface of the first aeration pipe (31) is communicated with a plurality of first branch pipes (32), the bottom end of the first branch pipe (32) is communicated with a first square box (33), and the first square box (33) is arranged with bubble-free membrane filaments (34); Water absorption zone assembly (4); The water absorption zone assembly (4) is symmetrically arranged on both sides of the bubble-free zone assembly (3) and is used for filtering and retaining bacteria and microorganisms in the water body and then discharging water; The water absorption zone assembly (4) comprises a suction pipe (41) communicated with a water suction pipe (12), both ends of the suction pipe (41) are symmetrically communicated with a confluence pipe (42), the surfaces of the two confluence pipes (42) are each communicated with a plurality of second branch pipes (43), corresponding to the two second branch pipes (43), a second square box (44) is commonly communicated, and the second square box (44) is arranged with filter membrane filaments (45); Micro-bubble zone assembly (5); The micro-bubble zone assembly (5) is arranged in the water absorption zone assembly (4) in a staggered manner and is used for aeration treatment of sewage; The micro-bubble zone assembly (5) comprises a second aeration pipe (51) communicated with a second air supply pipe (13), one end of the second aeration pipe (51) is communicated with two branch pipes (52), the surfaces of the two branch pipes (52) are each communicated with a third branch pipe (53), corresponding to the two third branch pipes (53), a third square box (54) is commonly communicated, and the third square box (54) is arranged with aeration membrane filaments (55); Water pump (20); The water pump (20) is communicated with the water absorption zone assembly (4) through the water suction pipe (12) and is used for providing negative pressure suction; Cleaning assembly (6); The cleaning assembly (6) is slidingly arranged on the surface of the support (1) and is used for cleaning the bubble-free zone assembly (3), the water absorption zone assembly (4) and the micro-bubble zone assembly (5); One end of the cleaning assembly (6) is communicated with two hoses (7), and the top ends of the two hoses (7) are commonly communicated with a three-way pipe (8); Pressure tank (16); The pressure tank (16) is communicated with the bubble-free zone assembly (3) through the first air supply pipe (11), the pressure tank (16) is communicated with the micro-bubble zone assembly (5) through the second air supply pipe (13), the pressure tank (16) is communicated with the cleaning assembly (6) through the third air supply pipe (14), and the three-way pipe (8) is communicated with the pressure tank (16) through the third air supply pipe (14); A plurality of air pumps (17) are communicated with one side of the pressure tank (16); The surfaces of the bubble-free zone assembly (3), the micro-bubble zone assembly (5) and the water absorption zone assembly (4) are each provided with a stand (10) fixed with the support (1).

2. The MBR membrane wastewater treatment apparatus according to claim 1, characterized by The cleaning assembly (6) comprises a frame (61) vertically moving on the surface of the support (1), wheel frames (62) are arranged at the four corners of the inner wall of the frame (61), and the wheel frames (62) are limited to roll on the four corners of the support (1); The frame (61) is symmetrically fixed with airtight bins (63) on two sides, the airtight bins (63) are communicated with adapter pipes (64) at one end, a plurality of bidirectional spray rods (68) and two unidirectional spray rods (67) are communicated on the opposite surfaces of the two airtight bins (63), a pressure reducing valve (65) is arranged at one end of the adapter pipe (64), the plurality of bidirectional spray rods (68) and the two unidirectional spray rods (67) are all installed with electromagnetic pulse valves (66) at one end, and the electromagnetic pulse valves (66) are located on the inner walls of the corresponding airtight bins (63).

3. The MBR membrane wastewater treatment apparatus according to claim 2, characterized by The plurality of bidirectional spray rods (68) and the two unidirectional spray rods (67) all comprise guide shells (681), the inner walls of the guide shells (681) are penetrated with spray pipes (682), the surfaces of the guide shells (681) are provided with bunches (685), the surfaces of the spray pipes (682) are provided with a plurality of spray heads (684) facing the bunches (685), and the surfaces of the guide shells (681) are provided with siphon openings (683).

4. The MBR membrane wastewater treatment apparatus according to claim 1, characterized by The first gas supply pipe (11), the second gas supply pipe (13) and the third gas supply pipe (14) are jointly provided with a main control valve (9) at the communication positions with the pressure tank (16). One side of the pressure tank (16) is communicated with the third gas supply pipe (14) through a backflushing pipe (15).

5. The MBR membrane wastewater treatment apparatus according to claim 1, characterized by The bubble-free membrane filament (34), the filtration membrane filament (45) and the aeration membrane filament (55) all comprise hollow fiber MBR membranes, the surface pore size of the aeration membrane filament (55) comprises a pore size <0.4 μm, and the filtration membrane filament (45) comprises a pore size <0.1 μm.

6. The MBR membrane wastewater treatment apparatus according to claim 4, characterized by The surfaces of the first gas supply pipe (11), the water pumping pipe (12), the second gas supply pipe (13), the third gas supply pipe (14) and the backflushing pipe (15) are all provided with flow control valves, the surface of the water pumping pipe (12) is provided with a pressure gauge (19) and a flowmeter (21), and one side of the pressure tank (16) is provided with a pressure protector (18).

7. The MBR membrane wastewater treatment apparatus according to claim 2, characterized by The bunches (685) of the unidirectional spray rod (67) and the bidirectional spray rod (68) are inclined downward at an amplitude of 5-60 degrees.

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