Integrated MABR + MBR combined process

Abstract

The invention discloses an integrated MABR + MBR combined process which comprises main equipment and is characterized in that the main equipment comprises a pretreatment unit, an integrated reactor (an MABR area), an integrated reactor (an MBR area) and an auxiliary unit, and aeration membrane equipment and separation membrane equipment are arranged in the main equipment; the pretreatment unit comprises a mechanical grid, an adjusting tank stirrer, a pH adjusting and adding device and a lifting pump. According to the integrated MABR and MBR combined process, micropores of an aeration membrane are used for discharging air, the oxygen transfer rate can reach up to 50-55% (50-70% or more electric energy is saved compared with that of traditional aeration), the survival rate of microbial flora in a tank is higher due to the efficient dissolved oxygen environment, and the number and variety of dominant flora are kept more balanced; meanwhile, double or multiple superposition of the MABR membrane wires is utilized, so that micro-nano bubbles (the diameter of the bubbles is about 10-30nm) collide and are superposed into large bubbles in the floating process, and the MBR membrane wires are directly impacted and oscillated, so that the traditional perforation aeration purging function is replaced.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to an integrated MABR+MBR combined process. Background Technology

[0002] MABR stands for Membrane Aeration Bioreactor. It is a biochemical process that uses membranes for aeration. However, membrane aeration does not refer to traditional microporous aeration, but rather utilizes the micropores on the surface of the organic membrane as the outlet for aeration diffusion. MABR is an upgraded version of the traditional biofilm method—it can treat more wastewater with less oxygen transfer energy consumption based on existing tank volume.

[0003] MBR stands for Membrane Bio-Reactor. It is a new type of wastewater treatment system that organically combines membrane separation technology with biological treatment technology. It replaces the secondary sedimentation tank at the end of traditional biological treatment technology with membrane modules, maintaining a high concentration of activated sludge in the bioreactor, increasing the organic load of biological treatment, thereby reducing the footprint of wastewater treatment facilities, and reducing the amount of residual sludge by maintaining a low sludge load. It mainly utilizes the micropores on the membrane surface to trap activated sludge and large molecular organic matter in the water to obtain high-quality permeate.

[0004] The novel combined process of MABR and MBR involves placing the MABR aeration membrane equipment at the bottom of the membrane tank in a flat installation configuration, with an air inlet pre-installed on the equipment; the MBR membrane separation equipment, with its built-in bottom adjustment device, has its membrane elements installed vertically above the MABR equipment, with a pre-installed permeate connection port.

[0005] Chinese Patent 201610638642.3 discloses an integrated MABR device for treating black and odorous water bodies. This integrated MABR device applies the highly efficient membrane bioreactor (MABR) method to the remediation of black and odorous rivers, combining oil separation, sedimentation, and filtration to form a modular water remediation device. It has a high degree of integration, a compact footprint, and compared to other river remediation technologies, its treatment effect is significant, its reliability is greatly enhanced, its implementation is simple, its operating cost is low, and it is easy to manage. However, this integrated MABR device for treating black and odorous water bodies, while solving the problem, also has the following drawbacks:

[0006] In current wastewater treatment, energy consumption and land occupation are two major challenges in process selection. Although traditional MBR has the advantage of reducing tank volume and land occupation, the energy consumption of membrane purging and aeration and the accumulation of high-concentration sludge pollution still hinder the development and application of MBR technology. Therefore, it is necessary to design an integrated MABR+MBR combined process. Summary of the Invention

[0007] The main objective of this invention is to provide an integrated MABR+MBR combined process, which can effectively solve the problems in the background technology.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] An integrated MABR+MBR combined process, comprising main equipment, is characterized in that: the main equipment includes a pretreatment unit, an integrated reactor (MABR zone), an integrated reactor (MBR zone), and auxiliary units; the main equipment internally houses aeration membrane equipment and separation membrane equipment; the pretreatment unit includes a mechanical bar screen, a regulating tank agitator, a pH adjustment and dosing device, and a booster pump; the integrated reactor (MABR zone) includes a hydrophobic and breathable hollow fiber membrane module, a low-pressure aeration blower, and a biofilm monitoring instrument; the integrated reactor (MBR zone) includes an MF / UF hollow fiber membrane module, perforated aeration pipes, a negative pressure suction pump, and a membrane flux monitoring instrument; the auxiliary units include sludge treatment, membrane cleaning, and disinfection; the sludge treatment includes a return pump, a sludge discharge pump, a sludge thickening tank, and a plate and frame filter press; the membrane cleaning includes a chemical reagent tank, a cleaning pump, and a waste liquid collection tank; and the disinfection includes an ultraviolet sterilizer or a sodium hypochlorite dosing device.

[0010] The present invention is further configured such that the specific steps of the integrated MABR+MBR combined process are as follows: pretreatment unit -- MABR core reaction unit -- MBR deep purification unit -- sludge return and discharge -- membrane cleaning and maintenance -- effluent disinfection and reuse / discharge.

[0011] The present invention is further configured such that the detailed steps of the preprocessing unit are as follows:

[0012] S1. Wastewater first enters the grit chamber, where large solid impurities such as tree branches, plastic bags, and pebbles are intercepted by mechanical or manual grit chambers to prevent clogging of subsequent membrane modules and pipelines.

[0013] S2. The effluent from the bar screen flows into the equalization tank to regulate the amount and quality of wastewater, reduce the impact of water quality and quantity fluctuations on the core reaction unit, and ensure stable system operation.

[0014] S3. If the suspended solids content in the wastewater is high, a sedimentation tank or flotation tank can be added after the equalization tank to initially remove some of the suspended solids and reduce the treatment load of the core unit.

[0015] The present invention is further configured such that the detailed steps of the MABR core reaction unit are as follows:

[0016] S1. The pretreated wastewater is pumped into the MABR zone of the integrated reactor. This zone contains a hydrophobic and breathable hollow fiber membrane module, and compressed air is introduced into the membrane cavity for bubble-free aeration.

[0017] S2. Oxygen diffuses outward through the membrane wall to the outer biofilm, while pollutants such as organic matter and ammonia nitrogen in the wastewater diffuse into the biofilm. Microorganisms form a stratified biofilm on the membrane surface (outer anaerobic, middle hypoxic, and inner aerobic).

[0018] S3: In the aerobic zone, microorganisms degrade organic matter and complete the nitrification reaction; in the anoxic zone, denitrification is achieved; and in the anaerobic zone, recalcitrant organic matter is degraded and phosphorus is released, thus simultaneously achieving organic matter removal and efficient nitrogen removal.

[0019] S4. No additional carbon source is required during the reaction process, the oxygen utilization rate is over 90%, and the energy consumption is significantly lower than that of traditional aeration processes.

[0020] The present invention is further configured such that the detailed steps of the transition section are as follows:

[0021] The effluent from the S1 and MABR zones flows by gravity into the MBR zone within the same reactor. This transition section requires no additional structures and utilizes natural mixing of the water flow to maintain stable parameters such as water quality and temperature.

[0022] S2. Some free microorganisms not attached to the MABR membrane enter the MBR area with the water flow and work synergistically with the activated sludge in the MBR tank to prevent pollutants from being "missed".

[0023] The present invention is further configured such that the detailed steps of the MBR deep purification unit are as follows:

[0024] S1 and MBR zones have built-in microfiltration or ultrafiltration membrane modules, and the tank maintains continuous aeration. On the one hand, this provides oxygen to the activated sludge, degrading residual organic matter and some nitrogen and phosphorus; on the other hand, the airflow generated disturbs the membrane surface, reducing membrane fouling.

[0025] S2. The membrane module generates negative pressure through a suction pump, which draws the purified water through the membrane pores, while simultaneously trapping pollutants such as activated sludge, undegraded suspended solids, bacteria, and viruses, thus achieving complete solid-liquid separation.

[0026] S3. The effluent from this step has suspended solids (SS) ≤1mg / L, turbidity ≤0.5NTU, and COD, ammonia nitrogen and other indicators can meet the Class IV surface water standard or reuse standard.

[0027] The present invention is further configured such that the detailed steps of sludge recirculation and discharge are as follows:

[0028] A portion of the activated sludge generated in the S1 and MBR zones is returned to the MABR zone via a return pump to replenish the microbial population in the MABR tank, thereby enhancing biofilm formation and pollutant degradation efficiency.

[0029] S2. Excess sludge is periodically discharged from the bottom of the MBR tank and enters the sludge thickening tank and dewatering room for treatment. After dewatering, the sludge can be transported to landfill or utilized for resource recovery.

[0030] The present invention is further configured such that the detailed steps for membrane cleaning and maintenance are as follows:

[0031] S1. Online cleaning: Physical cleaning is performed daily by aeration and disturbance, and online chemical cleaning is performed weekly to monthly using chemical agents such as sodium hypochlorite and citric acid to remove contaminants from the membrane surface;

[0032] S2. Offline cleaning: When the membrane flux drops below 50% of the design value, remove the membrane module and soak it in a high-concentration chemical agent to clean it and restore the membrane filtration performance.

[0033] The present invention is further configured such that the detailed steps for effluent disinfection and reuse / discharge are as follows:

[0034] S1 and MBR effluent can be disinfected using different methods depending on their intended use. Common methods include ultraviolet disinfection or sodium hypochlorite disinfection to kill residual bacteria and viruses and ensure the safety and hygiene of the effluent.

[0035] S2. The disinfected effluent can be reused directly, or discharged into natural water bodies after meeting the discharge standards.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] 1. In this invention, by utilizing the micropores of the aeration membrane for air output, the oxygen transfer rate can reach as high as 50-55% (saving more than 50%-70% of electrical energy compared to traditional aeration). The highly efficient dissolved oxygen environment results in a higher survival rate of microbial communities in the pool, and the quantity and types of dominant bacteria are maintained in a more balanced manner. At the same time, by utilizing the double or multiple superposition of MABR membrane fibers, micro-nano bubbles (bubble diameter of about 10-30nm) collide and superimpose into large bubbles during the floating process, directly impacting and vibrating the MBR membrane fibers, thereby replacing the traditional perforated aeration and purging function.

[0038] 2. In this invention, the organic matter of the aeration membrane itself is used as a carrier for microorganisms. The inner layer of bacteria on the membrane surface is in long-term contact with oxygen to form aerobic bacteria. The middle and outer layers of bacteria gradually form anaerobic and facultative anaerobic bacteria according to changes in the oxygen environment. That is, each aeration membrane device is a microscopic combination of AO processes. The MBR separation membrane equipment is set above the aeration membrane by utilizing the longitudinal depth of the tank. It combines the advantages of biochemical and membrane processes and is more integrated than the traditional AO+MBR process, which greatly saves tank space.

[0039] 3. In this invention, since most of the microbial cells in the tank are concentrated on the surface of the aeration membrane, the number of cells free in the water will be effectively reduced. Unlike in the traditional MBR process, where most of the sludge cells accumulate on the surface of the separation membrane, seriously affecting the water production performance of the separation membrane, this will greatly slow down the fouling rate of the separation membrane, reduce the frequency of membrane cleaning, and further increase its service life. Attached Figure Description

[0040] Figure 1 This is a front view structural diagram of the present invention;

[0041] Figure 2 This is a schematic diagram of the preprocessing unit structure of the present invention;

[0042] Figure 3 This is a schematic diagram of the integrated reactor (MABR region) structure of the present invention;

[0043] Figure 4 This is a schematic diagram of the integrated reactor (MBR region) structure of the present invention;

[0044] Figure 5 This is a schematic diagram of the auxiliary unit structure of the present invention;

[0045] Figure 6 This is a schematic diagram of the integrated MABR+MBR combined process flow structure of the present invention;

[0046] Figure 7 This is a schematic diagram of the sludge return path structure of the present invention;

[0047] Figure 8 This is a schematic diagram of the residual sludge return path structure of the present invention;

[0048] Figure 9 This is a schematic diagram of the membrane cleaning path structure of the present invention.

[0049] In the diagram: 1. Aeration membrane equipment; 2. Separation membrane equipment; Detailed Implementation

[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] like Figure 1-9 As shown, the integrated MABR+MBR combined process includes a main unit, which includes a pretreatment unit, an integrated reactor (MABR zone), an integrated reactor (MBR zone), and auxiliary units. The main unit is internally equipped with an aeration membrane device 1 and a separation membrane device 2.

[0052] In this embodiment, the pretreatment unit includes a mechanical bar screen, an equalization tank agitator, a pH adjustment and dosing device, and a booster pump. The integrated reactor (MABR area) includes a hydrophobic and breathable hollow fiber membrane module, a low-pressure aeration blower, and a biofilm monitor. The integrated reactor (MBR area) includes an MF / UF hollow fiber membrane module, perforated aeration pipes, a negative pressure suction pump, and a membrane flux monitor. The auxiliary unit includes sludge treatment, membrane cleaning, and disinfection. The sludge treatment includes a return pump, a sludge discharge pump, a sludge thickening tank, and a plate and frame filter press. The membrane cleaning includes a chemical reagent tank, a cleaning pump, and a waste liquid collection tank. The disinfection includes an ultraviolet sterilizer or a sodium hypochlorite dosing device.

[0053] In this embodiment, the specific steps of the integrated MABR+MBR combined process are as follows: pretreatment unit -- MABR core reaction unit -- MBR deep purification unit -- sludge return and discharge -- membrane cleaning and maintenance -- effluent disinfection and reuse / discharge.

[0054] In this embodiment, the detailed steps of the preprocessing unit are as follows:

[0055] S1. Wastewater first enters the grit chamber, where large solid impurities such as tree branches, plastic bags, and pebbles are intercepted by mechanical or manual grit chambers to prevent clogging of subsequent membrane modules and pipelines.

[0056] S2. The effluent from the bar screen flows into the equalization tank to regulate the amount and quality of wastewater, reduce the impact of water quality and quantity fluctuations on the core reaction unit, and ensure stable system operation.

[0057] S3. If the suspended solids content in the wastewater is high, a sedimentation tank or flotation tank can be added after the equalization tank to initially remove some of the suspended solids and reduce the treatment load of the core unit.

[0058] In this embodiment, the detailed steps of the MABR core reaction unit are as follows:

[0059] S1. The pretreated wastewater is pumped into the MABR zone of the integrated reactor. This zone contains a hydrophobic and breathable hollow fiber membrane module, and compressed air is introduced into the membrane cavity for bubble-free aeration.

[0060] S2. Oxygen diffuses outward through the membrane wall to the outer biofilm, while pollutants such as organic matter and ammonia nitrogen in the wastewater diffuse into the biofilm. Microorganisms form a stratified biofilm on the membrane surface (outer anaerobic, middle hypoxic, and inner aerobic).

[0061] S3: In the aerobic zone, microorganisms degrade organic matter and complete the nitrification reaction; in the anoxic zone, denitrification is achieved; and in the anaerobic zone, recalcitrant organic matter is degraded and phosphorus is released, thus simultaneously achieving organic matter removal and efficient nitrogen removal.

[0062] S4. No additional carbon source is required during the reaction process, the oxygen utilization rate is over 90%, and the energy consumption is significantly lower than that of traditional aeration processes.

[0063] In this embodiment, the detailed steps of the transition section are as follows:

[0064] The effluent from the S1 and MABR zones flows by gravity into the MBR zone within the same reactor. This transition section requires no additional structures and utilizes natural mixing of the water flow to maintain stable parameters such as water quality and temperature.

[0065] S2. Some free microorganisms not attached to the MABR membrane enter the MBR area with the water flow and work synergistically with the activated sludge in the MBR tank to prevent pollutants from being "leaked" for treatment.

[0066] In this embodiment, the detailed steps of the MBR deep purification unit are as follows:

[0067] S1 and MBR zones have built-in microfiltration or ultrafiltration membrane modules, and the tank maintains continuous aeration. On the one hand, this provides oxygen to the activated sludge, degrading residual organic matter and some nitrogen and phosphorus; on the other hand, the airflow generated disturbs the membrane surface, reducing membrane fouling.

[0068] S2. The membrane module generates negative pressure through a suction pump, which draws the purified water through the membrane pores, while simultaneously trapping pollutants such as activated sludge, undegraded suspended solids, bacteria, and viruses, thus achieving complete solid-liquid separation.

[0069] S3. The effluent from this step has suspended solids (SS) ≤1mg / L, turbidity ≤0.5NTU, and COD, ammonia nitrogen and other indicators can meet the Class IV surface water standard or reuse standard.

[0070] In this embodiment, the detailed steps of sludge recirculation and discharge are as follows:

[0071] A portion of the activated sludge generated in the S1 and MBR zones is returned to the MABR zone via a return pump to replenish the microbial population in the MABR tank, thereby enhancing biofilm formation and pollutant degradation efficiency.

[0072] S2. Excess sludge is periodically discharged from the bottom of the MBR tank and enters the sludge thickening tank and dewatering room for treatment. After dewatering, the sludge can be transported to landfill or utilized for resource recovery.

[0073] In this embodiment, the detailed steps for membrane cleaning and maintenance are as follows:

[0074] S1. Online cleaning: Physical cleaning is performed daily by aeration and disturbance, and online chemical cleaning is performed weekly to monthly using chemical agents such as sodium hypochlorite and citric acid to remove contaminants from the membrane surface;

[0075] S2. Offline cleaning: When the membrane flux drops below 50% of the design value, remove the membrane module and soak it in a high-concentration chemical agent to clean it and restore the membrane filtration performance.

[0076] In this embodiment, the detailed steps for effluent disinfection and reuse / discharge are as follows:

[0077] S1 and MBR effluent can be disinfected using different methods depending on their intended use. Common methods include ultraviolet disinfection or sodium hypochlorite disinfection to kill residual bacteria and viruses and ensure the safety and hygiene of the effluent.

[0078] S2. The disinfected effluent can be reused directly, or discharged into natural water bodies after meeting the discharge standards.

[0079] Working Principle: During operation, air is released through the micropores of the aeration membrane, achieving an oxygen transfer rate of 50-55% (saving over 50%-70% of electrical energy compared to traditional aeration). This highly efficient dissolved oxygen environment results in a higher survival rate of microbial communities within the tank, maintaining a more balanced quantity and variety of dominant bacteria. Simultaneously, the double or multiple superposition of MABR membrane fibers causes micro-nano bubbles (approximately 10-30nm in diameter) to collide and superimpose during their ascent, forming larger bubbles that directly impact and vibrate the MBR membrane fibers, replacing the traditional perforated aeration and purging function. The organic matter within the aeration membrane itself serves as a carrier for microorganisms. The inner layer of bacteria on the membrane surface maintains long-term contact with oxygen, forming aerobic communities; the middle and outer layers gradually develop into anaerobic and facultative anaerobic communities based on changes in the oxygen environment. In other words, each aeration membrane device is a group of microorganisms... The invention combines the AO process with the MBR membrane separation equipment, which utilizes the longitudinal depth of the tank and is positioned above the aeration membrane. This design integrates the advantages of both biochemical and membrane processes, offering greater integration than the traditional AO+MBR process. It significantly saves tank space, as most microorganisms are concentrated on the surface of the aeration membrane, resulting in a significantly reduced number of free-floating microorganisms in the water. This avoids the accumulation of sludge bacteria on the separation membrane surface, which severely impacts the membrane's water production performance, as is common in traditional MBR processes. This greatly slows down the membrane fouling rate, reduces cleaning frequency, and extends its service life. This invention organically combines the aeration membrane and separation membrane processes, designing a novel process and equipment that leverages the advantages of each while effectively mitigating their drawbacks, achieving a perfect synergy.

Claims

1. An integrated MABR+MBR combined process, including the main equipment, characterized in that: The main equipment includes a pretreatment unit, an integrated reactor (MABR area), an integrated reactor (MBR area), and auxiliary units. The main equipment is equipped with an aeration membrane device (1) and a separation membrane device (2). The pretreatment unit includes a mechanical bar screen, an equalization tank agitator, a pH adjustment and dosing device, and a booster pump. The integrated reactor (MABR area) includes a hydrophobic and breathable hollow fiber membrane module, a low-pressure aeration blower, and a biofilm monitoring instrument. The integrated reactor (MBR area) includes an MF / UF hollow fiber membrane module, perforated aeration pipes, a negative pressure suction pump, and a membrane flux monitoring instrument. The auxiliary units include sludge treatment, membrane cleaning, and disinfection. The sludge treatment includes a return pump, a sludge discharge pump, a sludge thickening tank, and a plate and frame filter press. The membrane cleaning includes a chemical reagent tank, a cleaning pump, and a waste liquid collection tank. The disinfection includes an ultraviolet sterilizer or a sodium hypochlorite dosing device.

2. The integrated MABR+MBR combined process according to claim 1, characterized in that: The specific steps of the integrated MABR+MBR combined process are as follows: pretreatment unit -- MABR core reaction unit -- MBR deep purification unit -- sludge return and discharge -- membrane cleaning and maintenance -- effluent disinfection and reuse / discharge.

3. The integrated MABR+MBR combined process according to claim 2, characterized in that: The detailed steps of the preprocessing unit are as follows: S1. Wastewater first enters the grit chamber, where large solid impurities such as tree branches, plastic bags, and pebbles are intercepted by mechanical or manual grit chambers to prevent clogging of subsequent membrane modules and pipelines. S2. The effluent from the bar screen flows into the equalization tank to regulate the amount and quality of wastewater, reduce the impact of water quality and quantity fluctuations on the core reaction unit, and ensure stable system operation. S3. If the suspended solids content in the wastewater is high, a sedimentation tank or flotation tank can be added after the equalization tank to initially remove some of the suspended solids and reduce the treatment load of the core unit.

4. The integrated MABR+MBR combined process according to claim 2, characterized in that: The detailed steps of the MABR core reaction unit are as follows: S1. The pretreated wastewater is pumped into the MABR zone of the integrated reactor. This zone contains a hydrophobic and breathable hollow fiber membrane module, and compressed air is introduced into the membrane cavity for bubble-free aeration. S2. Oxygen diffuses outward through the membrane wall to the outer biofilm, while pollutants such as organic matter and ammonia nitrogen in the wastewater diffuse into the biofilm. Microorganisms form a stratified biofilm on the membrane surface (outer anaerobic, middle hypoxic, and inner aerobic). S3: In the aerobic zone, microorganisms degrade organic matter and complete the nitrification reaction; in the anoxic zone, denitrification is achieved; and in the anaerobic zone, recalcitrant organic matter is degraded and phosphorus is released, thus simultaneously achieving organic matter removal and efficient nitrogen removal. S4. No additional carbon source is required during the reaction process, the oxygen utilization rate is over 90%, and the energy consumption is significantly lower than that of traditional aeration processes.

5. The integrated MABR+MBR combined process according to claim 2, characterized in that: The detailed steps for the transition section are as follows: The effluent from the S1 and MABR zones flows by gravity into the MBR zone within the same reactor. This transition section requires no additional structures and utilizes natural mixing of the water flow to maintain stable parameters such as water quality and temperature. S2. Some free microorganisms not attached to the MABR membrane enter the MBR area with the water flow and work synergistically with the activated sludge in the MBR tank to prevent pollutants from being "leaked" for treatment.

6. The integrated MABR+MBR combined process according to claim 2, characterized in that: The detailed steps of the MBR deep purification unit are as follows: S1 and MBR zones have built-in microfiltration or ultrafiltration membrane modules, and the tank maintains continuous aeration. On the one hand, this provides oxygen to the activated sludge, degrading residual organic matter and some nitrogen and phosphorus; on the other hand, the airflow generated disturbs the membrane surface, reducing membrane fouling. S2. The membrane module generates negative pressure through a suction pump, which draws the purified water through the membrane pores, while simultaneously trapping pollutants such as activated sludge, undegraded suspended solids, bacteria, and viruses, thus achieving complete solid-liquid separation. S3. The effluent from this step has suspended solids (SS) ≤1mg / L, turbidity ≤0.5NTU, and COD, ammonia nitrogen and other indicators can meet the Class IV surface water standard or reuse standard.

7. The integrated MABR+MBR combined process according to claim 2, characterized in that: The detailed steps for sludge return and discharge are as follows: A portion of the activated sludge generated in the S1 and MBR zones is returned to the MABR zone via a return pump to replenish the microbial population in the MABR tank, thereby enhancing biofilm formation and pollutant degradation efficiency. S2. Excess sludge is periodically discharged from the bottom of the MBR tank and enters the sludge thickening tank and dewatering room for treatment. After dewatering, the sludge can be transported to landfill or utilized for resource recovery.

8. The integrated MABR+MBR combined process according to claim 2, characterized in that: The detailed steps for membrane cleaning and maintenance are as follows: S1. Online cleaning: Physical cleaning is performed daily by aeration and disturbance, and online chemical cleaning is performed weekly to monthly using chemical agents such as sodium hypochlorite and citric acid to remove contaminants from the membrane surface; S2. Offline cleaning: When the membrane flux drops below 50% of the design value, remove the membrane module and soak it in a high-concentration chemical agent to clean it and restore the membrane filtration performance.

9. The integrated MABR+MBR combined process according to claim 2, characterized in that: The detailed steps for effluent disinfection and reuse / discharge are as follows: S1 and MBR effluent can be disinfected using different methods depending on their intended use. Common methods include ultraviolet disinfection or sodium hypochlorite disinfection to kill residual bacteria and viruses and ensure the safety and hygiene of the effluent. S2. The disinfected effluent can be reused directly, or discharged into natural water bodies after meeting the discharge standards.

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