A method for treating organic solid waste and wastewater and an anaerobic biological reaction system thereof

Abstract

The present invention provides a method for treating organic solid waste and wastewater and an anaerobic bioreactor system thereof, and relates to the field of anaerobic reactor fermentation technology. The anaerobic bioreactor system includes: a reaction tank body, a filter assembly, and a biogas circulation assembly; the reaction tank body includes an anaerobic hydrolysis and acidification reaction tank and an anaerobic methanogenesis reaction tank; the filter assembly can perform membrane separation treatment on the mud-water mixture and can discharge the filtrate from the anaerobic methanogenesis reaction tank; the biogas circulation assembly is connected to the anaerobic hydrolysis and acidification reaction tank and the anaerobic methanogenesis reaction tank for collecting biogas and returning the biogas. A reciprocating drive assembly drives the membrane filtration device to move back and forth, and removes the mud cake layer on the surface of the membrane fiber through shaking inertia. The present invention improves the efficiency of organic solid waste and wastewater treatment, improves the effluent water quality, and enhances energy recovery capacity through the comprehensive optimization of structural design, membrane separation treatment, and biogas recycling, showing significant environmental and economic benefits.

Description

Technical Field

[0001] The present invention relates to the technical field of anaerobic reactor fermentation, in particular to a method for treating organic solid waste and wastewater and an anaerobic biological reaction system thereof. Background Art

[0002] Anaerobic digestion, an effective method for converting organic waste into the energy source methane, is widely used worldwide to treat sludge, sewage, organic wastewater, and organic solid waste. This technology relies on the metabolic activity of anaerobic microorganisms to decompose complex organic matter into methane, achieving waste resource utilization and environmental sustainability. However, despite its significant environmental and economic benefits, anaerobic digestion technology still faces a number of technical and operational challenges in its practical application.

[0003] Currently, single-phase completely mixed anaerobic reactors are a common form of anaerobic digestion technology. This reactor has a simple design and is easy to operate, but it exhibits significant limitations when treating high-concentration organic wastewater and solid waste. Because the hydrolysis, acidification, and methanogenesis processes require the collaboration of different microbial communities, and these microbial communities have different optimal requirements for environmental conditions such as temperature and pH, single-phase reactors struggle to provide the optimal growth and metabolic environment for microorganisms at different stages. In addition, poor sludge settling performance leads to high levels of functional microorganisms and unutilized organic substrates in the effluent, affecting the efficiency of anaerobic digestion.

[0004] Another drawback of the existing technology is that the generation time of methanogens is long and the proliferation rate is slow, which limits the adaptability of the reactor to high-load conditions. Under high-load conditions, the substrate utilization efficiency of the reactor is low, and it is unable to effectively treat large amounts of organic solid waste and wastewater. It is also prone to acidification, resulting in a decline in reactor performance or even collapse. In addition, single-phase completely mixed anaerobic reactors also exhibit problems such as large footprint, poor effluent water quality, poor system stability and low resistance to organic loads in actual applications. These problems not only affect the treatment efficiency of anaerobic digestion technology, but also limit its application in the treatment of high-concentration organic wastewater and solid waste.

[0005] In summary, existing single-phase, completely mixed anaerobic reactors have multiple drawbacks when treating high-concentration organic solid waste and wastewater. These include difficulty in providing an optimal environment for microorganisms at different stages, poor sludge settling performance, the presence of large amounts of unutilized organic substrate and functional microorganisms in the effluent, insufficient adaptability to high-load conditions, large footprint, poor effluent quality, and poor system stability. These issues result in low substrate utilization efficiency, poor effluent quality, and insufficient system stability, severely limiting the application and development of anaerobic digestion technology in the treatment of organic solid waste and wastewater. Therefore, developing new anaerobic digester systems that can adapt to high-load conditions, improve effluent quality, and enhance system stability has become a pressing technical challenge in this field.

[0006] In view of this, the present invention is proposed. Summary of the Invention

[0007] The object of the present invention is to provide an anaerobic biological reaction system and a method for treating organic solid waste and wastewater. The anaerobic biological reaction system improves treatment efficiency and effluent water quality, while enhancing the energy recovery capacity of the system, and has obvious environmental and economic benefits.

[0008] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are adopted:

[0009] In a first aspect, the present invention provides an anaerobic biological reaction system for treating organic solid waste and wastewater, comprising:

[0010] Reaction tank body, filtration components and biogas circulation components;

[0011] The reaction tank body includes an anaerobic hydrolysis acidification reaction tank and an anaerobic methanogenesis reaction tank which are arranged based on the treatment flow direction of the organic solid waste and wastewater and are connected in sequence; wherein the material in the anaerobic hydrolysis acidification reaction tank can overflow into the anaerobic methanogenesis reaction tank;

[0012] The filtering component can perform membrane separation treatment on the mud-water mixture in the anaerobic methanogenesis reaction tank, and can discharge the filtrate produced by the membrane separation treatment from the anaerobic methanogenesis reaction tank;

[0013] The biogas circulation component is connected to both the anaerobic hydrolysis and acidification reaction tank and the anaerobic methanogenesis reaction tank, and is used to collect the biogas generated in the anaerobic hydrolysis and acidification reaction tank and the anaerobic methanogenesis reaction tank, and return the biogas to the anaerobic hydrolysis and acidification reaction tank and the anaerobic methanogenesis reaction tank.

[0014] In an optional embodiment, a partition is provided between the anaerobic hydrolysis and acidification reaction tank and the anaerobic methanogenesis reaction tank;

[0015] The partition is provided with an overflow hole;

[0016] The material in the anaerobic hydrolysis and acidification reaction tank can overflow into the anaerobic methanogenesis reaction tank through the overflow hole;

[0017] In an optional embodiment, the anaerobic hydrolysis and acidification reaction tank is provided with a feed pipeline;

[0018] In an optional embodiment, the anaerobic methanogenesis reaction tank is provided with a sludge discharge pipeline;

[0019] In an optional embodiment, the partition is provided with a plurality of overflow holes in a vertical direction perpendicular to the overflow direction of the material from the anaerobic hydrolysis acidification reaction tank toward the anaerobic methanogenesis reaction tank;

[0020] In an optional embodiment, the overflow hole includes an orifice, and a controllable switch hole cover provided on the orifice and capable of closing the orifice.

[0021] In an optional embodiment, the filtration assembly includes a membrane filtration device, a water outlet pipeline and a filtration pump;

[0022] The membrane filtration device is arranged in the anaerobic methanogenesis reaction tank;

[0023] The outlet pipe is connected to the membrane filtration device and is used to lead out the filtrate produced by the anaerobic methanogenesis reaction tank after the membrane separation treatment of the filtration component;

[0024] The filter pump is connected to the water outlet pipeline;

[0025] In an optional embodiment, the filter assembly further includes a filter control device electrically connected to the filter pump;

[0026] In an optional embodiment, the filter assembly further comprises a pressure monitoring device provided on the water outlet pipe;

[0027] In an optional embodiment, the membrane filtration device includes a filtration body, and a plurality of hollow fiber membrane units disposed in the filtration body;

[0028] In an optional embodiment, the filter material in the hollow fiber membrane unit is made of PVDF and / or PTFE.

[0029] In an optional embodiment, the filter assembly further includes a backwashing device;

[0030] The backwash device includes a backwash pipeline and a backwash pump connected to the backwash pipeline;

[0031] The backwash pipeline is connected to the top of the membrane filtration device, and the backwash pipeline is provided with a backwash liquid for backwashing the membrane filtration device;

[0032] The flow direction of the backflushing liquid is opposite to the flow direction of the filtrate in the outlet pipe.

[0033] In an optional embodiment, the biogas circulation component includes a gas collection pipeline, a gas circulation pump and a gas diffusion device;

[0034] The front end of the gas collection pipeline is connected to both the anaerobic hydrolysis and acidification reaction tank and the anaerobic methanogenesis reaction tank, and is used to receive the biogas generated in the anaerobic hydrolysis and acidification reaction tank and the anaerobic methanogenesis reaction tank;

[0035] The gas circulation pump is arranged on the gas collecting pipeline;

[0036] The gas diffusion device is connected to the tail end of the gas collection pipeline and is respectively placed in the anaerobic hydrolysis acidification reaction tank and the anaerobic methanogenesis reaction tank;

[0037] In an optional embodiment, the biogas circulation component further includes a gas one-way valve provided on the gas collection pipeline;

[0038] In an optional embodiment, the biogas circulation component further includes a gas flow valve provided on the gas collection pipeline;

[0039] In an optional embodiment, a biogas collection pipeline is further provided at the upper end of the anaerobic methanogenesis reaction tank.

[0040] In an optional embodiment, the gas collection pipeline includes a main pipeline, and a first collection pipe and a second collection pipe both connected to the main pipeline;

[0041] The first collecting pipe is connected to the top of the anaerobic methanogenesis reaction tank;

[0042] The second collecting pipe is connected to the top of the anaerobic hydrolysis and acidification reaction tank.

[0043] In an optional embodiment, the anaerobic bioreactor system further comprises a reciprocating drive assembly;

[0044] The reciprocating drive assembly is connected to the membrane filtration device and is used to control the membrane filtration device to move back and forth in the anaerobic methanogenesis reaction tank;

[0045] In an optional embodiment, the reciprocating drive assembly includes a drive motor, a slider, a sliding platform and a movement control device;

[0046] The movement control device is electrically connected to the drive motor; the slider is connected to the membrane filtration device;

[0047] The slider is arranged on the sliding platform and can drive the membrane filtration device to move along the length direction of the sliding platform based on the control of the movement control device and the drive of the drive motor.

[0048] In a second aspect, the present invention provides a method for treating organic solid waste and wastewater, based on the anaerobic biological reaction system described in any one of the aforementioned embodiments, comprising:

[0049] The organic solid waste and wastewater enter the anaerobic hydrolysis and acidification reaction tank in the reaction tank body through the feed pipeline to undergo hydrolysis and acidification to produce fermentation liquid;

[0050] The fermentation liquid overflows from the anaerobic hydrolysis and acidification reaction tank into the anaerobic methanogenesis reaction tank for methanogenesis to form a mud-water mixture, and small molecular organic matter in the mud-water mixture is converted into methane and carbon dioxide; wherein the mud-water mixture in the anaerobic methanogenesis reaction tank is subjected to membrane separation treatment by a filtration component, and the filtrate produced by the membrane separation treatment is discharged from the anaerobic methanogenesis reaction tank;

[0051] The biogas generated in the anaerobic hydrolysis and acidification reaction tank and the anaerobic methanogenesis reaction tank are collected respectively by a biogas circulation component, and the biogas is fed back to the anaerobic hydrolysis and acidification reaction tank and the anaerobic methanogenesis reaction tank to be mixed with the mud-water mixture.

[0052] In an optional embodiment, the method for treating organic solid waste and wastewater further comprises:

[0053] By means of a pressure monitoring device and a filter pump on the outlet pipe of the filter assembly, the membrane filter device is controlled to switch back and forth between a membrane filtration state and a membrane relaxation state, thereby performing the membrane separation treatment on the mud-water mixture;

[0054] In an optional embodiment, the time ratio of the membrane filtration state and the membrane relaxation state is numerically no greater than 1 / 3.

[0055] In an optional embodiment, the method for treating organic solid waste and wastewater further comprises:

[0056] The transmembrane pressure difference is collected in real time or at regular intervals by the pressure monitoring device;

[0057] When the transmembrane pressure difference reaches the preset shutdown threshold, the shutdown maintenance process is entered;

[0058] In an optional embodiment, the preset shutdown threshold is 30 kPa;

[0059] In an optional embodiment, the shutdown maintenance process includes:

[0060] Stop feeding, and inject a backwash chemical cleaning liquid into the membrane filtration device through a backwash pump in the backwash device through a backwash pipeline, so that the backwash chemical cleaning liquid contacts the membrane fibers in the filter material of the membrane filtration device;

[0061] The reciprocating drive assembly is turned on, and the slider is driven by the driving motor to drive the membrane filtration device to move back and forth along the length direction of the sliding platform, so that the membrane filaments in the filter material of the membrane filtration device remove the mud cake layer on the surface of the membrane filaments through the inertia of shaking, and return to execute the real-time or periodic collection of the transmembrane pressure difference by the pressure monitoring device.

[0062] Compared with the prior art, the present invention has the following beneficial effects:

[0063] The present invention provides an anaerobic biological reaction system and a method for treating organic solid waste and wastewater, wherein the anaerobic biological reaction system, through its innovative structural design, achieves an optimized configuration of an anaerobic hydrolysis acidification reaction tank and an anaerobic methanogenesis reaction tank, and utilizes baffles and overflow holes of different heights to accurately control the flow of materials, thereby simplifying the reactor structure and enhancing operational flexibility. This design creates an optimal growth and metabolic environment for acid-producing and methanogenic microorganisms, effectively improving the treatment efficiency and adaptability of the reactor. In addition, the filtering component in the system performs efficient membrane separation treatment on the mud-water mixture in the anaerobic methanogenesis reaction tank, thereby improving the sludge treatment efficiency and effluent water quality, reducing the organic load in the sludge, and facilitating subsequent treatment. The introduction of the biogas circulation component not only improves the utilization rate of biogas as an energy source, but also enhances the mixing of microorganisms and materials by returning the collected biogas to the reaction tank, improving the methane production efficiency, reducing biogas emissions, and reducing environmental impact. Overall, the system has improved the efficiency of organic solid waste and wastewater treatment, improved effluent quality, and enhanced energy recovery capabilities through comprehensive optimization of structural design, membrane separation treatment, and biogas recycling, demonstrating significant environmental and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0065] Figure 1 Schematic diagram of the structure and connection relationship of the anaerobic biological reaction system in the embodiment of the present application;

[0066] Figure 2 This is a front view structural diagram of a partition (without a controllable switch cover at the opening) of an anaerobic biological reaction system in an embodiment of the present application;

[0067] Figure 3 This is a front view structural diagram of a partition (with a controllable switch hole cover at the hole) of an anaerobic biological reaction system in an embodiment of the present application;

[0068] Figure 4 Schematic diagram of the process of closing the orifice of the anaerobic biological reaction system by a controllable switch hole cover in the embodiment of the present application;

[0069] Figure 5 This is a side structural schematic diagram of a membrane filtration device of an anaerobic biological reaction system in an embodiment of the present application;

[0070] Figure 6 Schematic diagram of the process of treating organic solid waste and wastewater in the embodiment of the present application;

[0071] Figure 7 The transmembrane pressure difference of the anaerobic bioreactor system in the embodiment of the present application in the membrane filtration state and the relaxed state;

[0072] Figure 8 The effluent and COD removal rate of the anaerobic biological reaction system under high load conditions in the embodiment of this application;

[0073] Figure 9 It is the biogas and methane production efficiency of the anaerobic biological reaction system in the embodiment of this application operating under high load conditions.

[0074] Explanation of the main component symbols: 100-anaerobic biological reaction system; 1-reactor body; 11-anaerobic hydrolysis and acidification reaction tank; 12-anaerobic methanogenesis reaction tank; 13-partition; 131-overflow hole; 1311-orifice; 1312-controllable switch hole cover; 14-feed pipeline; 15-sludge discharge pipeline; 2-filtration assembly; 21-membrane filtration device; 211-hollow fiber membrane unit; 22-water outlet pipeline; 23-filtration pump; 24-filtration control device; 25-pressure monitoring Device; 26-backwash device; 261-backwash pipeline; 262-backwash pump; 3-biogas circulation component; 31-gas collection pipeline; 311-main pipeline; 312-first collection pipe; 313-second collection pipe; 32-gas circulation pump; 33-gas diffusion device; 34-gas one-way valve; 35-gas flow valve; 36-biogas collection pipeline; 4-reciprocating drive assembly; 41-drive motor; 42-slider; 43-sliding platform; 44-movement control device. DETAILED DESCRIPTION

[0075] The embodiments of the present invention will be described in detail below with reference to the examples, but it will be understood by those skilled in the art that the following examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention. Where specific conditions are not specified in the examples, the methods were performed according to conventional conditions or the conditions recommended by the manufacturer. Where the manufacturers of the reagents or instruments are not specified, they are all commercially available conventional products.

[0076] refer to Figure 1 In an embodiment of the present application, an anaerobic biological reaction system 100 is provided, which is used for treating organic solid waste and wastewater, including: a reaction tank body 1, a filtering component 2 and a biogas circulation component 3; the reaction tank body 1 includes an anaerobic hydrolysis and acidification reaction tank 11 and an anaerobic methanogenesis reaction tank 12 which are arranged based on the treatment flow direction of the organic solid waste and wastewater and are connected in sequence; wherein, the material in the anaerobic hydrolysis and acidification reaction tank can overflow into the anaerobic methanogenesis reaction tank 12.

[0077] The filter assembly 2 can perform membrane separation treatment on the mud-water mixture in the anaerobic methanogenesis reaction tank 12 , and can discharge the filtrate generated by the membrane separation treatment from the anaerobic methanogenesis reaction tank 12 .

[0078] The biogas circulation component 3 is connected to both the anaerobic hydrolysis and acidification reaction tank 11 and the anaerobic methanogenesis reaction tank 12, and is used to collect the biogas generated in the anaerobic hydrolysis and acidification reaction tank 11 and the anaerobic methanogenesis reaction tank 12, and return the biogas to the anaerobic hydrolysis and acidification reaction tank 11 and the anaerobic methanogenesis reaction tank 12.

[0079] As mentioned above, organic solid waste and wastewater refer to wastes containing a high proportion of organic matter. These substances can be carbon-based compounds that are widely found in nature. During anaerobic digestion, they can be broken down by microorganisms into methane and other small molecules. The specific types of organic solid waste and wastewater can be very diverse, including but not limited to waste liquid, sewage, sludge, and solid waste.

[0080] As mentioned above, the reaction tank body 1 is composed of an anaerobic hydrolysis and acidification reaction tank 11 and an anaerobic methanogenesis reaction tank 12 connected in sequence. This design is based on the flow direction of organic solid waste and wastewater treatment, so that materials can be smoothly transferred between the two reaction tanks. The improvement lies in controlling the flow of materials through the partition 13 and the overflow hole 131, thereby providing an optimal growth environment for different microorganisms. This structure is simple and flexible to operate, and can adjust the hydraulic retention time and sludge retention time as needed to adapt to different treatment requirements. By controlling the overflow holes 131 at different heights, the hydraulic retention time (HRT) and sludge retention time (SRT) of the acid-producing phase can be adjusted to ensure the best hydrolysis and acidification efficiency. This structure solves the problem that microorganisms in traditional single-phase completely mixed anaerobic reactors are difficult to grow and metabolize under the optimal environment, thereby improving treatment efficiency and system stability.

[0081] For example, the anaerobic hydrolysis and acidification reaction tank 11 can be designed as a container of a certain volume, in which an agitator is installed to promote mixing of the material and microorganisms. Overflow can be achieved through overflow holes 131, overflow channels, and other structures to control the flow of material from the anaerobic hydrolysis and acidification reaction tank 11 to the anaerobic methanogenesis reaction tank 12.

[0082] It should be noted that the anaerobic hydrolysis and acidification reaction tank 11 may include pre-placed hydrolysis and acidification bacteria. These microorganisms are responsible for decomposing complex organic matter into smaller molecules. For example, hydrolytic bacteria decompose proteins, fats and carbohydrates into amino acids, fatty acids and monosaccharides.

[0083] During the treatment process, organic wastewater and solid waste are fed into the anaerobic hydrolysis and acidification reaction tank 11 as reaction substrates. These wastewater and solid wastes contain various organic substances, including but not limited to food waste, agricultural waste, industrial organic wastewater, and various solid wastes. After treatment, hydrolysis products are obtained, which can include small-molecule organic matter, hydrolysis products, and biogas. These include amino acids, fatty acids, monosaccharides, and other low-molecular organic acids produced after hydrolysis. During the acidification process, organic acids such as acetic acid, propionic acid, and butyric acid are further produced. Biogas (primarily hydrogen and carbon dioxide) is generated by the conversion of some organic matter into hydrogen and carbon dioxide during the hydrolysis and acidification process. These gases can be utilized by methanogenic bacteria in the subsequent methanogenesis reaction tank.

[0084] The anaerobic methanogenesis reaction tank 12 may contain pre-installed methanogenic bacteria, which convert small organic molecules, hydrogen, and carbon dioxide in the hydrolysis and acidification reaction tank into methane. The treatment process also includes receiving overflow hydrolysis and acidification products, namely small organic molecules such as acetic acid, propionic acid, and butyric acid, from the anaerobic hydrolysis and acidification reaction tank 11; biogas (primarily methane and carbon dioxide), which is produced by the activity of methanogenic bacteria and is the primary goal of the anaerobic digestion process as methane is a valuable energy source; residual organic matter, which is not fully converted and may include some difficult-to-degrade compounds; and sludge, the solid residue generated during the reaction process, which includes microbial cells and unconverted organic matter. Thus, a sludge-water mixture is formed in the anaerobic methanogenesis reaction tank 12.

[0085] The microorganisms and substances in the two reaction pools interact with each other to complete the anaerobic digestion process of organic solid waste and wastewater, ultimately producing methane, a clean energy source, and treated clean water.

[0086] As mentioned above, filtration assembly 2 is responsible for membrane separation of the sludge-water mixture in anaerobic methanogenesis reaction tank 12 and discharging the filtrate. This improved process is achieved through membrane filtration technology, which improves separation efficiency. Filter assembly 2 solves the organic load problem in sludge, reducing the organic substrate in the sludge, facilitating subsequent processing, and improving the system's energy recovery capacity.

[0087] The biogas circulation component 3 connects the anaerobic hydrolysis and acidification reaction tank 11 and the anaerobic methanogenesis reaction tank 12, and is used to collect and recycle the generated biogas. This improved process improves energy utilization by recycling biogas. The biogas circulation component 3 can include structures such as pipelines, a circulation pump, and a diffusion device. These components work together to achieve biogas collection and uniform gas distribution, thereby improving methanogenesis efficiency. The biogas circulation component 3 solves the problem of biogas emissions and reduces environmental pollution. At the same time, by recirculating biogas, it increases the mixing of microorganisms and materials in the reaction tank, thereby improving methanogenesis efficiency.

[0088] In summary, the anaerobic bioreactor system 100 in the embodiment of the present application optimizes the treatment of organic solid waste and wastewater through its structural design, membrane separation treatment and biogas recycling, improves the treatment efficiency and effluent water quality, and at the same time enhances the energy recovery capacity of the system, with obvious environmental and economic benefits.

[0089] refer to Figure 2A partition 13 is provided between the anaerobic hydrolysis and acidification reaction tank 11 and the anaerobic methanogenesis reaction tank 12. The partition 13 is provided with an overflow hole 131. The material in the anaerobic hydrolysis and acidification reaction tank can overflow into the anaerobic methanogenesis reaction tank 12 through the overflow hole 131.

[0090] It should be noted that the acidogenic phase reaction tank (anaerobic hydrolysis and acidification reaction tank 11) and the methanogenic phase reaction tank (anaerobic methanogenesis reaction tank 12) in the reaction tank body 1 of the embodiment of the present application are separated by a partition 13. The partition 13 is a physical barrier provided between the anaerobic hydrolysis and acidification reaction tank 11 and the anaerobic methanogenesis reaction tank 12, which separates the two reaction tanks while allowing materials to flow from one reaction tank to the other.

[0091] The partition 13 is provided with overflow holes 131, which allow the material in the anaerobic hydrolysis and acidification reaction tank 11 to overflow into the anaerobic methanogenesis reaction tank 12 after reaching a certain liquid level. This design allows the two reaction tanks to operate independently while maintaining continuous material flow. This structure solves the problems of uneven material mixing and unsuitable microbial growth environment in traditional single-phase reactors, providing more precise control of hydraulic retention time and sludge retention time, thereby optimizing the anaerobic digestion process.

[0092] In some embodiments, the anaerobic hydrolysis and acidification reaction tank 11 is provided with a feed pipeline 14 .

[0093] As mentioned above, the feed line 14 is a pipe connected to the anaerobic hydrolysis acidification reaction tank 11 for feeding organic solid waste and wastewater into the reaction tank. The design of the feed line 14 allows the operator to control the inflow of waste, ensuring uniform distribution and continuous supply of materials in the reaction tank.

[0094] In some embodiments, the anaerobic methanogenesis reaction tank 12 is provided with a sludge discharge pipeline 15 .

[0095] As mentioned above, the sludge discharge pipeline 15 is a pipeline connected to the anaerobic methanogenesis reaction tank 12. By adjusting the filtered water flow rate, the sludge discharge flow rate and the water inlet flow rate, the sludge age and hydraulic retention time of the methanogenesis phase (anaerobic methanogenesis reaction tank 12) can be adjusted respectively, thereby maintaining a suitable sludge concentration and sludge flow state.

[0096] In some embodiments, the partition 13 is provided with a plurality of overflow holes 131 in a vertical direction perpendicular to the overflow direction of the material from the anaerobic hydrolysis and acidification reaction tank toward the anaerobic methanogenesis reaction tank 12 .

[0097] As mentioned above, the overflow direction of the material from the anaerobic hydrolysis and acidification reaction tank to the anaerobic methanogenesis reaction tank 12 is horizontal, and the direction perpendicular to it is vertical. The partition 13 is provided with a plurality of overflow holes 131, for example, 3, 5, 7, etc.

[0098] The actual effective volume of the acid-producing phase is controlled by the overflow hole 131 in the longitudinal direction of the partition 13. The reactor has a simple structure and flexible operation, and is convenient for constructing the optimal growth and metabolic environment for acid-producing and methanogenic microorganisms.

[0099] refer to Figure 3 In some embodiments, the overflow hole 131 includes an orifice 1311 and a controllable switch hole cover 1312 disposed on the orifice 1311 and capable of closing the orifice 1311 .

[0100] As mentioned above, the overflow hole 131 is an opening on the partition 13, which allows the material to flow from the anaerobic hydrolysis acidification reaction tank 11 to the anaerobic methanogenesis reaction tank 12. In the embodiment of the present application, the overflow hole 131 includes an orifice 1311 and a controllable switch hole cover 1312 provided on the orifice 1311. For example, its switch process can refer to Figure 4 .

[0101] It should be noted that the partition 13 is provided with a plurality of overflow holes 131, and each overflow hole 131 has a corresponding switchable hole cover 1312 on the hole opening 1311. This design allows the operator to adjust the opening and closing of the overflow hole 131 as needed to control the flow rate of the material.

[0102] In order to achieve controllability of all overflow holes 131, several structural and mechanical solutions may be adopted, but are not limited to:

[0103] (1) Centralized control system: A centralized control system can be designed, which can be manual or automatic, to uniformly control the controllable switch hole covers 1312 of all overflow holes 131. This system can include a central control unit connected to the controllable switch hole covers 1312 of each overflow hole 131 through a mechanical linkage or a hydraulic / pneumatic system. This allows operators to control all overflow holes 131 from a single location. Precise and synchronized operation can be achieved.

[0104] (2) Electric or pneumatic actuators: Electric or pneumatic actuators can be installed on the controllable switch hole cover 1312 of each overflow hole 131. These actuators can be remotely controlled to open or close the hole cover. This can achieve fast and precise control. It is suitable for automated control and reduces manual operation.

[0105] (3) Linkage mechanism: A set of linkage mechanisms can be used to enable the operation of a main control lever to be simultaneously transmitted to the controllable switch hole covers 1312 of all overflow holes 131, thereby achieving linkage control. The structure is simple and the cost is low. Uniform and synchronous control can be achieved.

[0106] (4) Hydraulic control system: The hydraulic system can be used to control the flow of hydraulic oil through a main control valve, thereby controlling the hydraulic cylinder connected to the controllable switch hole cover 1312 of each overflow hole 131 to open and close the hole cover. It can provide a large driving force and is suitable for heavy-load applications. It can achieve fine control and adjustment.

[0107] (5) Intelligent sensor and feedback system: A liquid level sensor is installed near each overflow hole 131 to monitor the liquid level changes in real time and transmit the data to the central control system. The system automatically adjusts the open and close status of the overflow hole 131 based on the liquid level information. This enables intelligent control based on real-time data. It can optimize the hydraulic retention time and sludge retention time, thereby improving treatment efficiency.

[0108] (6) Mechanical linkage switch: A mechanical linkage switch system is designed, similar to the linkage mechanism of an old faucet. By rotating a central knob, a series of gears and levers are driven to control the controllable switch hole covers 1312 of all overflow holes 131. The structure is compact and maintenance-friendly. It can provide intuitive control feedback.

[0109] (7) Programmable Logic Controller (PLC): A PLC can be used to control electric or pneumatic actuators. The PLC can control the on / off state of each overflow hole 131 according to a preset program or an operator's instruction. The PLC has high flexibility and can adjust the control strategy according to different processing requirements. It can be integrated into the factory automation system.

[0110] Through the above solution, precise and controllable control of the controllable switch hole cover 1312 of the overflow hole 131 can be achieved, thereby optimizing the material flow between the anaerobic hydrolysis acidification reaction tank 11 and the anaerobic methanogenesis reaction tank 12, and improving the efficiency and controllability of the entire anaerobic biological reaction system 100.

[0111] In some embodiments, the filtration assembly 2 includes a membrane filtration device 21, an outlet pipe 22, and a filter pump 23. The membrane filtration device 21 is disposed in the anaerobic methanogenesis reaction tank 12. The outlet pipe 22 is connected to the membrane filtration device 21 and is used to discharge the filtrate generated by the membrane separation treatment in the anaerobic methanogenesis reaction tank 12; the filter pump 23 is connected to the outlet pipe 22.

[0112] In some embodiments, the filter assembly 2 further includes a filter control device 24 electrically connected to the filter pump 23 .

[0113] In some embodiments, the filter assembly 2 further includes a pressure monitoring device 25 provided on the water outlet pipe 22 .

[0114] refer to Figure 5 In some embodiments, the membrane filtration device 21 includes a filtration body and a plurality of hollow fiber membrane units 211 disposed in the filtration body.

[0115] In some embodiments, the filter material in the hollow fiber membrane unit 211 is made of PVDF and / or PTFE.

[0116] As mentioned above, the membrane filtration device 21 is the core part of the filtration assembly 2, which is arranged in the anaerobic methanogenesis reaction tank 12 and is used to perform membrane separation treatment on the mud-water mixture.

[0117] The membrane filtration device 21 includes a filter body and a plurality of hollow fiber membrane units 211 disposed therein. The hollow fiber membrane units 211 may be made of PVDF (polyvinylidene fluoride) and / or PTFE (polytetrafluoroethylene), which have good chemical stability and durability.

[0118] This structure provides an efficient and stable solid-liquid separation method, which can improve the effluent quality, reduce the burden of subsequent treatment, and promptly discharge substances that may inhibit anaerobic digestion, such as salinity and ammonia nitrogen, thereby improving system stability.

[0119] Outlet pipe 22 is connected to membrane filtration device 21 and is used to direct the filtrate produced after membrane separation treatment from anaerobic methanogenesis reactor 12. The design and advantages of this structure: Outlet pipe 22 allows for efficient filtrate discharge, reducing the retention time of liquid within the reactor and improving treatment efficiency. Prompt filtrate discharge reduces the accumulation of organic matter within the reactor, preventing reactor overload. It also reduces the organic load in the sludge, facilitating sludge stabilization.

[0120] As mentioned above, a hose can be provided at the front end of the water outlet pipeline 22, and the hose can be provided at the top end of the membrane filtration device 21. After the hose is connected from the reactor, it is connected to the water outlet pipeline 22, the pressure monitoring system, the filter pump 23 and the filter control device 24.

[0121] Filter pump 23 is connected to outlet pipe 22 and is used to push the filtrate out through outlet pipe 22. The design of filter pump 23 ensures that the filtrate can be discharged smoothly, overcoming pipeline resistance and other pressure losses. Filter pump 23 solves the problem of poor filtrate discharge caused by pipeline resistance, ensuring the continuity and efficiency of the filtration process.

[0122] The filtration control device 24 is electrically connected to the filtration pump 23 and is used to control the operation of the filtration pump 23, thereby controlling the filtration process. The filtration control device 24 can be automated, adjusting the operating state of the filtration pump 23 based on a preset program or real-time data (such as data from the pressure monitoring device 25). The filtration control device 24 provides precise control of the filtration process, optimizing filtration efficiency and energy consumption, while also extending the service life of the membrane filtration device 21.

[0123] As mentioned above, the filtering control device 24 may include but is not limited to a processor, a bus, and a storage unit, a controller, an input / output module, a sensor interface, a communication unit, a power supply unit, etc. connected to the processor via the bus.

[0124] Pressure monitoring device 25, installed on outlet pipe 22, monitors pressure changes during membrane filtration. This device provides real-time feedback on the operating status of membrane filtration device 21, such as the transmembrane pressure differential. By monitoring pressure changes, blockages or other abnormalities in membrane filtration device 21 can be detected promptly, allowing for timely cleaning or maintenance, ensuring the continuity and stability of the filtration process.

[0125] For example, the membrane filtration device 21 can be designed with a modular structure for easy installation and replacement. The hollow fiber membrane unit 211 can be installed vertically or horizontally in the filter body to accommodate different spatial layouts and processing requirements. The filtration control device 24 can be integrated into a central control system to enable remote monitoring and operation. The pressure monitoring device 25 can use a wireless sensor to transmit data to the central control system for real-time monitoring.

[0126] In summary, the filter assembly 2, through the design of its membrane filter device 21, outlet pipe 22, filter pump 23, filter control device 24 and pressure monitoring device 25, realizes efficient membrane separation treatment of the mud-water mixture in the anaerobic methanogenesis reaction tank 12, thereby improving the effluent water quality; the filter assembly 2 separates the sludge and water through the suction action of the pump, thereby maintaining a high sludge concentration in the anaerobic methanogenesis reaction tank 12, thereby improving the anaerobic methanogenesis efficiency; the stability and controllability of the system are enhanced, while reducing the burden of subsequent processing.

[0127] In some embodiments, the filter assembly 2 also includes a backwash device 26; the backwash device 26 includes a backwash pipe 261 and a backwash pump 262 connected to the backwash pipe 261; the backwash pipe 261 is connected to the top of the membrane filtration device 21, and the backwash pipe 261 is provided with a backwash liquid for backwashing the membrane filtration device 21; the flow direction of the backwash liquid is opposite to the flow direction of the filtrate in the outlet pipe 22.

[0128] As mentioned above, backwashing device 26 is used to regularly clean membrane filtration device 21 to maintain its filtration efficiency and extend its service life. Backwashing device 26 includes a backwashing line 261 and a backwashing pump 262. Backwashing line 261 is connected to the top of membrane filtration device 21 and contains a backwashing liquid for backwashing membrane filtration device 21. Backwashing device 26 can solve the common clogging problem during membrane filtration, improve membrane cleaning efficiency, and reduce maintenance costs and operational complexity.

[0129] Backflush line 261 connects backflush pump 262 to membrane filtration device 21 and is used to deliver backflush liquid to membrane filtration device 21. The design of backflush line 261 allows the backflush liquid to reach the top of membrane filtration device 21 directly, achieving a top-down backwash, effectively removing contaminants from the membrane surface. This design addresses the problem of decreased filtration efficiency caused by contaminant accumulation in traditional membrane filtration, restoring the membrane's filtration performance through backwashing.

[0130] As mentioned above, backflush pump 262 is a pump used to provide pressure to deliver backflush liquid to membrane filtration device 21. The design of backflush pump 262 allows the operator to adjust the pressure and flow of the backflush liquid as needed, effectively cleaning membrane filtration device 21. Backflush pump 262 solves the problem of difficult-to-remove contaminants on the membrane surface. By regularly backflushing, it maintains the membrane's filtration efficiency and extends its service life.

[0131] For example, the backflushing line 261 can be designed to be connected to the top of each hollow fiber membrane unit 211 of the membrane filtration device 21 to ensure that the backflushing liquid is evenly distributed to each membrane unit. The backflushing pump 262 can be electric, and its start and stop, as well as the pressure and flow rate of the backflushing liquid, are controlled by the filtration control device 24. The backflushing liquid can be clean water, a detergent solution, or other suitable cleaning liquid, depending on the membrane material and the type of wastewater being treated.

[0132] In summary, the backwash device 26, through its backwash line 261 and backwash pump 262, efficiently cleans the membrane filtration device 21 in the anaerobic methanogenesis reaction tank 12, improving filtration efficiency and extending the life of the membrane while reducing maintenance costs and operational complexity. This structural design makes the anaerobic biological reaction system 100 more efficient and reliable in treating organic solid waste and wastewater.

[0133] In some embodiments, the biogas circulation component 3 includes a gas collection pipeline 31, a gas circulation pump 32 and a gas diffusion device 33; the front end of the gas collection pipeline 31 is connected to both the anaerobic hydrolysis acidification reaction tank 11 and the anaerobic methanogenesis reaction tank 12, and is used to receive the biogas generated in the anaerobic hydrolysis acidification reaction tank 11 and the anaerobic methanogenesis reaction tank 12; the gas circulation pump 32 is provided on the gas collection pipeline 31; the gas diffusion device 33 is connected to the tail end of the gas collection pipeline 31, and is respectively placed in the anaerobic hydrolysis acidification reaction tank 11 and the anaerobic methanogenesis reaction tank 12.

[0134] In some embodiments, the biogas circulation component 3 further includes a gas one-way valve 34 provided on the gas collection pipeline 31;

[0135] In some embodiments, the biogas circulation component 3 further includes a gas flow valve 35 provided on the gas collection pipeline 31;

[0136] In some embodiments, a biogas collection pipeline 36 is further provided at the upper end of the anaerobic methanogenesis reaction tank 12 .

[0137] In some embodiments, the gas collection pipeline 31 includes a main pipeline 311, and a first collection pipe 312 and a second collection pipe 313 both connected to the main pipeline 311;

[0138] The first collecting pipe 312 is connected to the top of the anaerobic methanogenesis reaction tank 12;

[0139] The second collecting pipe 313 is connected to the top of the anaerobic hydrolysis and acidification reaction tank 11 .

[0140] As mentioned above, the gas collection line 31 is a pipeline connecting the anaerobic hydrolysis and acidification reactor 11 and the anaerobic methanogenesis reactor 12, used to receive the biogas produced by both reactors. The front end of the gas collection line 31 is connected to both reactors, and the rear end is connected to the gas circulation pump 32 and the gas diffusion device 33, forming a closed-loop biogas collection and distribution system. This design allows for efficient collection and reuse of biogas, improving its utilization rate and reducing greenhouse gas emissions.

[0141] The gas circulation pump 32 is provided on the gas collection pipeline 31 to promote the circulation of biogas in the system. The provision of the gas circulation pump 32 ensures that the biogas can be effectively extracted from the reaction tank and transported to the gas diffusion device 33.

[0142] A gas diffusion device 33 is connected to the tail end of the gas collection line 31 and is placed within the anaerobic hydrolysis and acidification reaction tank 11 and the anaerobic methanogenesis reaction tank 12. It is used to evenly release biogas into the reaction tanks. The design of the gas diffusion device 33 allows the biogas to be evenly distributed throughout the reaction tanks in the form of bubbles, promoting sufficient contact between the microorganisms and the biogas. This design improves the utilization efficiency of biogas during the anaerobic digestion process, contributing to increased methanogenesis efficiency and the processing capacity of the reaction tanks.

[0143] A gas one-way valve 34 is provided on the gas collection pipe 31 to prevent the backflow of biogas and ensure the one-way flow of biogas. The provision of the gas one-way valve 34 prevents the backflow of biogas and ensures the stability and safety of the biogas cycle.

[0144] As mentioned above, the gas flow valve 35 is provided on the gas collection pipeline 31 to regulate the flow of biogas. The provision of the gas flow valve 35 allows the operator to adjust the flow of biogas as needed, thereby achieving precise control of the biogas cycle.

[0145] As mentioned above, a biogas collecting pipe 36 is provided at the upper end of the anaerobic methanogenesis reaction tank 12 for collecting biogas from the top of the reaction tank. The design of the biogas collecting pipe 36 allows biogas to be collected directly from the top of the reaction tank, reducing the escape of biogas.

[0146] The biogas circulation component 3, through its structure of the gas collection pipeline 31, gas circulation pump 32, gas diffusion device 33, gas one-way valve 34, gas flow valve 35 and biogas collection pipeline 36, realizes the efficient collection, circulation and utilization of the biogas generated in the anaerobic hydrolysis acidification reaction tank 11 and the anaerobic methanogenesis reaction tank 12, thereby improving the utilization rate of biogas, reducing greenhouse gas emissions, and optimizing the operating conditions of the reaction tank, thereby improving the efficiency and environmental friendliness of the entire anaerobic biological reaction system 100.

[0147] It should be noted that the biogas circulation component 3 plays a crucial role in the anaerobic bioreactor system 100, promoting the mixing of materials and microorganisms. This component collects biogas produced during the fermentation process in the anaerobic hydrolysis and acidification reaction tank 11, primarily consisting of hydrogen and carbon dioxide, as well as biogas produced in the anaerobic methanogenesis reaction tank 12, primarily consisting of methane and carbon dioxide. This biogas is transported to the bottom of the reaction tank via a circulation line and gas circulation pump 32, where it is diffused through a gas diffusion device 33.

[0148] During this process, most of the biogas from the anaerobic hydrolysis and acidification reaction tank 11 is recycled, and the hydrogen contained therein is further converted into methane in the anaerobic methanogenesis reaction tank 12. However, only a portion of the biogas produced in the anaerobic methanogenesis reaction tank 12 is recycled for material mixing; the remainder is captured via the biogas collection line 36. The gas flow valve 35 precisely controls the biogas flow in the anaerobic hydrolysis and acidification reaction tank 11 and the anaerobic methanogenesis reaction tank 12, ensuring that both reaction tanks achieve the optimal mixing state, thereby optimizing the efficiency and performance of the entire anaerobic bioreactor system 100.

[0149] In some embodiments, the anaerobic biological reaction system 100 further includes a reciprocating drive assembly 4 ; the reciprocating drive assembly 4 is connected to the membrane filtration device 21 and is used to control the membrane filtration device 21 to move back and forth in the anaerobic methanogenesis reaction tank 12 .

[0150] In some embodiments, the reciprocating drive assembly 4 includes a drive motor 41, a slider 42, a sliding platform 43 and a movement control device 44; the movement control device 44 is electrically connected to the drive motor 41; the slider 42 is connected to the membrane filtration device 21; the slider 42 is arranged on the sliding platform 43, and can drive the membrane filtration device 21 to move along the length direction of the sliding platform 43 based on the control of the movement control device 44 and the drive of the drive motor 41.

[0151] As mentioned above, the reciprocating drive assembly 4 is a system for controlling the reciprocating movement of the membrane filtration device 21 in the anaerobic methanogenesis reaction tank 12 to optimize the membrane filtration efficiency and reduce membrane fouling.

[0152] The reciprocating drive assembly 4 includes a drive motor 41, a slider 42, a sliding platform 43, and a motion control device 44. These components together form a structure that enables dynamic movement of the membrane filtration device 21, improving its adaptability and efficiency. This design addresses the problem of contaminant accumulation on the membrane surface of the membrane filtration device 21 during long-term operation. Reciprocating motion reduces membrane fouling, extending the membrane's cleaning cycle and service life.

[0153] The drive motor 41 is the power source for the reciprocating drive assembly 4, providing the power to reciprocate the membrane filtration device 21 within the reaction tank. The slider 42 is a mechanical component connecting the drive motor 41 and the membrane filtration device 21. It moves along the sliding platform 43, driving the membrane filtration device 21 to reciprocate. The design of the slider 42 ensures smooth movement of the membrane filtration device 21 on the sliding platform 43, reducing wear and energy consumption.

[0154] The sliding platform 43 is a track structure that supports the movement of the slider 42 and the membrane filter device 21. The design of the sliding platform 43 allows the membrane filter device 21 to move along the length of the reaction tank. Therefore, during periods of downtime for maintenance or other related periods, the slider 42 can move the membrane filter device 21, causing the filter material therein to vibrate, thereby shaking off any adsorbed, adhered, or incidental contaminants.

[0155] The movement control device 44 is a control component electrically connected to the drive motor 41 and is used to control the movement of the slider 42, thereby driving the reciprocating movement of the membrane filter device 21. The movement control device 44 can be a PLC or other automated control system, which controls the movement of the membrane filter device 21 according to a preset program or real-time data.

[0156] It should be noted that, in the anaerobic biological reaction system 100 , the movement control device 44 and the filtration control device 24 can be the same device or different devices, depending on the design and control requirements of the system.

[0157] When the mobile control device 44 and the filter control device 24 are the same device, this device is typically an integrated control system, such as a programmable logic controller (PLC) or an industrial computer system. This integrated control approach can simplify system design, reduce hardware requirements, lower costs, and improve system compactness and ease of operation.

[0158] When the mobile control device 44 and the filter control device 24 are separate devices, each device has a dedicated control function, usually to meet specific control requirements and improve control accuracy. This separate control method can provide greater flexibility and control accuracy, especially in complex industrial applications.

[0159] For example, using a tablet computer as a control device can effectively integrate and simplify the functions of the mobile control unit 44 and the filtration control unit 24 in the anaerobic bioreactor system 100. The tablet computer connects to on-site sensors and actuators via wireless or wired communication modules, receiving data from pressure monitoring and liquid level sensors and dynamically adjusting the operating status of the filtration pump 23 and backwash pump based on this information. The user interface intuitively displays all operating parameters and system status, allowing operators to adjust filtration parameters such as pump speed and the movement frequency of the membrane filtration unit 21 directly through the touchscreen. Furthermore, the tablet computer's software can record operating data and historical trends, perform fault diagnosis, and promptly notify operators of system anomalies. This integrated control solution not only reduces the need for on-site control cabinets and multiple control units, simplifying operation and maintenance, but also improves the system's flexibility and user-friendliness. The tablet computer's mobility and remote monitoring capabilities allow operators to monitor system status from within the control room or at a remote location, improving operational convenience and efficiency.

[0160] In summary, using a tablet computer as a control device provides a cost-effective, easily upgradeable and replaceable solution for the anaerobic bioreactor system 100 while maintaining a high degree of flexibility and control accuracy.

[0161] refer to Figure 6 In an embodiment of the present application, a method for treating organic solid waste and wastewater is further provided, based on the anaerobic biological reaction system 100 described in any of the aforementioned embodiments, comprising:

[0162] In step S1, the organic solid waste and wastewater enter the anaerobic hydrolysis and acidification reaction tank 11 in the reaction tank body 1 through the feed pipeline 14 to undergo hydrolysis and acidification to produce fermentation liquid.

[0163] As mentioned above, the organic solid waste and wastewater enter the anaerobic hydrolysis and acidification reaction tank 11 through the feed pipe 14. This step is the beginning of the entire treatment process, and the organic solid waste and wastewater to be treated are introduced into the system.

[0164] By introducing the organic solid waste and wastewater into the anaerobic hydrolysis acidification reaction tank 11, biodegradation treatment can be started on them. The advantage is that the organic solid waste and wastewater can be initially decomposed, providing conditions for the subsequent methanation reaction.

[0165] The organic solid waste and wastewater can be fed into the anaerobic hydrolysis acidification reaction tank 11 by gravity flow or pumping. The feed line 14 can be equipped with a control valve to adjust the feed rate and amount to meet different treatment requirements.

[0166] As mentioned above, in the anaerobic hydrolysis and acidification reaction tank 11, organic solid waste and wastewater undergo hydrolysis and acidification, producing a fermentation broth. This step converts complex organic matter into simpler organic matter through the action of microorganisms. The fermentation broth provides the necessary substrate for the subsequent methanation reaction, thereby improving the energy recovery and treatment efficiency of the entire system.

[0167] The hydrolysis and acidification process can be optimized by controlling the temperature, pH value, and hydraulic retention time in the reaction tank. The activity of microorganisms can be enhanced by adding appropriate nutrients and adjusting operating conditions.

[0168] In step S2, the fermentation liquid overflows from the anaerobic hydrolysis and acidification reaction tank 11 into the anaerobic methanogenesis reaction tank 12 for methanogenesis to form a mud-water mixture, and the small molecular organic matter in the mud-water mixture is converted into methane and carbon dioxide; wherein, the mud-water mixture in the anaerobic methanogenesis reaction tank 12 is subjected to membrane separation treatment by the filtration component 2, and the filtrate produced by the membrane separation treatment is discharged from the anaerobic methanogenesis reaction tank 12.

[0169] As described above, the fermentation liquid flows from the anaerobic hydrolysis and acidification reaction tank 11 into the anaerobic methanogenesis reaction tank 12 through the overflow hole 131. During this step, the fermentation liquid mixes with the mud-water mixture in the anaerobic methanogenesis reaction tank 12. This step ensures a smooth transfer of the fermentation liquid to the anaerobic methanogenesis reaction tank 12, providing a continuous supply of substrate for the methanogenesis reaction, ensuring the continuity and stability of the reaction.

[0170] The design and layout of the overflow holes 131 need to take fluid dynamics into consideration to ensure that the fermentation liquid can flow evenly and continuously into the anaerobic methanogenesis reaction tank 12. The flow rate can be controlled by adjusting the size and number of the overflow holes 131 on the partition 13.

[0171] As described above, the filtration assembly 2 performs membrane separation on the sludge-water mixture in the anaerobic methanogenesis reaction tank 12, converting small organic molecules into methane and carbon dioxide while simultaneously discharging the filtrate. This step results in clean filtrate and methane-rich biogas. This has the advantages of improving effluent quality, reducing the burden of sludge treatment, and recovering valuable energy: methane.

[0172] Solid-liquid separation is achieved using a membrane filtration device 21, where the hollow fiber membrane unit 211 is made of PVDF and / or PTFE to improve filtration efficiency and durability. A filter pump 23 and outlet pipe 22 are responsible for removing the filtrate, while a pressure monitoring device 25 monitors pressure changes during the filtration process.

[0173] In step S3, the biogas generated in the anaerobic hydrolysis and acidification reaction tank 11 and the anaerobic methanogenesis reaction tank 12 are collected by the biogas circulation component 3, and the biogas is fed back to the anaerobic hydrolysis and acidification reaction tank 11 and the anaerobic methanogenesis reaction tank 12 to be mixed with the mud-water mixture.

[0174] As mentioned above, the biogas recycling component 3 collects the biogas produced in the anaerobic hydrolysis and acidification reaction tank 11 and the anaerobic methanogenesis reaction tank 12 and returns the biogas to the reaction tanks for mixing with the mud-water mixture. This step results in increased biogas utilization and promotes mixing of materials and microorganisms in the reaction tanks through biogas recycling, which has the advantage of increasing methane production and improving the overall efficiency of the system.

[0175] Biogas circulation is achieved through a gas collection pipeline 31, a gas circulation pump 32, and a gas diffuser 33. A gas check valve 34 and a gas flow valve 35 control the direction and volume of biogas flow. The design of the biogas collection pipeline 36 must take into account the structure and layout of the reaction tank to ensure efficient collection and distribution of biogas.

[0176] In summary, a series of sequential steps achieves effective treatment and resource recovery of organic solid waste and wastewater. Each step is tailored to specific treatment needs, and through precise control and optimization, the efficiency and environmental friendliness of the entire system are improved.

[0177] In some embodiments, the method for treating organic solid waste and wastewater further comprises:

[0178] Step S4, controlling the membrane filtration device 21 to switch back and forth between the membrane filtration state and the membrane relaxation state through the pressure monitoring device 25 and the filtration pump 23 on the outlet pipe 22 of the filtration assembly 2, so as to perform the membrane separation treatment on the mud-water mixture.

[0179] As described above, the pressure monitoring device 25 and filter pump 23 on the outlet pipe 22 of the filter assembly 2 control the membrane filtration device 21 to switch back and forth between the membrane filtration state and the membrane relaxation state to perform membrane separation on the mud-water mixture. By switching between the membrane filtration state and the membrane relaxation state, contamination and clogging of the membrane surface can be effectively reduced, extending the membrane cleaning cycle and service life, while ensuring filtration efficiency and effluent quality.

[0180] State switching can be achieved using a timer or a feedback control algorithm based on the pressure monitoring device 25. For example, when the pressure monitoring device 25 detects that the pressure of the membrane filtration device 21 has risen to a preset threshold, the system automatically switches to the membrane relaxation state to reduce the pressure on the membrane surface and reduce the accumulation of pollutants.

[0181] In some embodiments, the ratio of the time spent in the membrane filtration state to the time spent in the membrane relaxation state is no greater than 1 / 3.

[0182] The ratio of time between the membrane filtration state and the membrane relaxation state is no more than 1 / 3, meaning the membrane relaxation state lasts longer, ensuring sufficient time for the membrane surface to recover and reduce fouling. This time ratio control optimizes filtration efficiency and membrane cleanliness, reduces maintenance requirements due to membrane fouling, and improves overall system stability and reliability.

[0183] Above, T 过滤 Time and T representing the membrane filtration state 松弛 The time during which the membrane is in a relaxed state.

[0184] R=T 过滤 / T 松弛 ;R≤1 / 3.

[0185] Wherein, R represents the time ratio of the membrane filtration state and the membrane relaxation state.

[0186] For example, T 过滤 :T 松弛 =1:3.

[0187] This time ratio control can be achieved through a programmable logic controller (PLC) or microcontroller. The system can dynamically adjust the time ratio based on preset time parameters or based on real-time feedback (such as transmembrane pressure difference).

[0188] In summary, the filtration assembly 2 is used to control membrane filtration and membrane relaxation, with the time ratio between membrane filtration and membrane relaxation typically controlled to 1 / 3, but can also be lower. Through these steps and control strategies, the treatment method of this embodiment can effectively treat organic solid waste and wastewater while optimizing the performance and lifespan of the membrane filtration device 21. This method not only improves treatment efficiency but also reduces maintenance costs, enhancing the sustainability and environmental friendliness of the system.

[0189] In some embodiments, the method for treating organic solid waste and wastewater further comprises:

[0190] Step S5: collecting the transmembrane pressure difference in real time or periodically through the pressure monitoring device 25 .

[0191] The above steps involve using pressure monitoring device 25 to measure the transmembrane pressure differential within membrane filtration device 21. This is the pressure differential generated when liquid passes through the membrane during the filtration process. By monitoring the transmembrane pressure differential, the operating status of membrane filtration device 21 can be monitored in real time, allowing for the timely detection of changes in filtration efficiency and preventing excessive membrane contamination and clogging.

[0192] Step S6: When the transmembrane pressure difference reaches a preset shutdown threshold, the shutdown maintenance process is entered.

[0193] When the monitored transmembrane pressure difference reaches the preset shutdown threshold, the system automatically initiates the shutdown maintenance process to prevent the performance of the membrane filtration device 21 from degrading. This step can protect the membrane filtration device 21 from irreversible damage, extend its service life, and maintain filtration efficiency.

[0194] It should be noted that transmembrane pressure (TMP) is a key performance indicator in the membrane filtration process. It directly reflects the degree of membrane surface contamination. As contaminants accumulate, the resistance to liquid passing through the membrane increases, and the TMP increases, enabling timely detection and treatment of membrane contamination. Furthermore, an increase in TMP typically indicates a decrease in filtration efficiency. When it exceeds a preset threshold, the membrane's filtration capacity is compromised, requiring cleaning or maintenance. Monitoring TMP helps prevent damage or rupture to the membrane material caused by excessive pressure. It also optimizes cleaning effectiveness, reduces the frequency and intensity of cleaning, and extends the life of the membrane. As a quantifiable parameter, TMP facilitates automated control, enabling the system to automatically execute maintenance procedures based on real-time data, reducing manual intervention and improving operational convenience and safety. Timely maintenance prevents the overall efficiency of the anaerobic bioreactor system 100 due to membrane performance degradation, reduces membrane replacement costs, and ensures that the filtered water quality meets standards for subsequent treatment or discharge. Therefore, the transmembrane pressure difference is an important indicator for evaluating the performance and maintenance requirements of the membrane filtration device 21. By monitoring and controlling it, the operating status of the membrane filtration device 21 can be effectively managed to ensure the efficient and stable operation of the entire anaerobic biological reaction system 100.

[0195] In some embodiments, the preset shutdown threshold is 30 kPa.

[0196] In some embodiments, the step S6, the shutdown maintenance process includes:

[0197] In step S61 , the feed is stopped, and the backwashing chemical cleaning liquid is injected into the membrane filter device 21 through the backwashing pump 262 in the backwashing device 26 from the backwashing pipeline 261 , so that the backwashing chemical cleaning liquid contacts the membrane fibers in the filter material of the membrane filter device 21 .

[0198] As described above, during the shutdown maintenance process, the backwash pump 262 in the backwash device 26 injects the backwash chemical cleaning liquid into the membrane filtration device 21 to clean the membrane surface. This step can effectively remove pollutants on the membrane surface and restore the membrane's filtration performance.

[0199] A timing pump or a proportional pump can be used to control the injection volume and pressure of the backwash chemical cleaning solution to ensure that the membrane fibers are fully exposed to the cleaning solution.

[0200] In step S62, the reciprocating drive assembly 4 is turned on, and the slider 42 is driven by the drive motor 41 to drive the membrane filtration device 21 to move back and forth along the length direction of the sliding platform 43, so that the membrane filaments in the filter material of the membrane filtration device 21 remove the mud cake layer on the surface of the membrane filaments through the inertia of shaking, and return to execute the real-time or periodic collection of the transmembrane pressure difference through the pressure monitoring device 25.

[0201] While injecting the backwash chemical cleaning liquid, the reciprocating drive assembly 4 is turned on to make the membrane filtration device 21 reciprocate along the sliding platform 43. The reciprocating motion helps to enhance the cleaning effect, remove the mud cake layer on the membrane surface by physical means, and improve the cleaning efficiency.

[0202] The frequency, speed and distance of the reciprocating movement can be set, and the movement of the reciprocating drive assembly 4 can be controlled by programming.

[0203] Through the above steps and control strategies, the treatment method in this embodiment can achieve effective treatment of organic solid waste and wastewater, while optimizing the performance and life of the membrane filtration device 21.

[0204] The reciprocating motion of the membrane filtration device 21 is controlled by the reciprocating drive assembly 4 to shake the membrane fouling, which reduces energy consumption and improves efficiency, can greatly alleviate membrane fouling and extend the filtration cycle. The control system adjusts the reciprocating motion parameters, making the reactor operation more flexible.

[0205] This approach not only improves treatment efficiency but also reduces maintenance costs, enhancing the sustainability and environmental friendliness of the system.

[0206] In order to better illustrate the above processing method, in this embodiment, the processing process and principle of the processing method are further explained:

[0207] After passing through the feed pipeline 14, the organic solid waste and wastewater enter the anaerobic hydrolysis acidification reaction tank 11. According to the flow rate and concentration of the feed, the overflow hole 131 of the anaerobic hydrolysis acidification reaction tank 11 is opened and closed to produce different hydraulic retention times to obtain appropriate hydrolysis acidification efficiency.

[0208] Organic solid waste and wastewater first enter the anaerobic hydrolysis acidification reaction tank 11 through the feed pipeline 14 system. During this process, according to the flow rate and concentration of the feed, the hydraulic retention time can be controlled by adjusting the opening and closing of the overflow hole 131 to optimize the hydrolysis acidification efficiency.

[0209] Typically, the hydraulic retention time of the anaerobic hydrolysis acidification reaction tank 11 is maintained at 3-5 days.

[0210] The stirring of the materials in the anaerobic hydrolysis and acidification reaction tank 11 mainly relies on the biogas generated during the reaction process. These biogases are collected through the gas collection pipeline 31 and transported to the gas diffusion device 33 by the gas circulation pump 32 for aeration, thereby achieving effective stirring of the hydrolysis and acidification reaction tank. The aeration flow is precisely controlled by the flow control valve on the air pipe. At this stage, the fermentation liquid produced in the reaction tank is rich in small molecular organic substances such as ethanol, propanol, acetic acid, propionic acid, butyric acid, etc. These substances can be quickly converted into methane in the subsequent anaerobic digestion process. At the same time, the biogas produced by the hydrolysis and acidification reaction tank, the main components of which include hydrogen and carbon dioxide, provides the necessary material basis for the subsequent methanogenesis reaction. Such a design not only improves the treatment efficiency of wastewater / waste, but also provides conditions for the recovery of biomass energy.

[0211] After the fermentation broth completes its initial conversion in the anaerobic hydrolysis and acidification reactor 11, it flows through the overflow port into the anaerobic methanogenesis reactor 12. During this process, the small organic molecules in the fermentation broth are further acted upon by microorganisms, converting them into biogas primarily composed of methane and carbon dioxide. This biogas is then recovered through the gas collection pipeline 31 system. The design of the anaerobic methanogenesis reactor 12 takes into account two key parameters: hydraulic retention time and organic load, to accommodate different treatment requirements.

[0212] Specifically, the reactor is designed to achieve an organic load of 10 to 15 grams of chemical oxygen demand (COD) per liter per day, while the hydraulic retention time is determined based on the characteristics of the substrate being treated to ensure optimal methanogenesis efficiency. This design enables the anaerobic methanogenesis reactor 12 to effectively treat organic solid waste and wastewater while optimizing biogas production, contributing to energy recovery and environmental protection.

[0213] The biogas circulating in the biogas circulation component 3 includes the hydrogen produced in the anaerobic hydrolysis and acidification reaction tank 11, and the hydrogen will be used by methanogens to further produce methane.

[0214] To ensure efficient effluent treatment, a filtration assembly 2 is installed within the anaerobic methanogenesis reactor 12. The membrane filtration device 21 within this assembly utilizes a hollow fiber membrane design, with the membrane area designed based on the required filtration flux. For treating high-concentration organic solid waste, the filtration flux is set at 1-5 liters / meter / hour. Under the suction of a filter pump 23 and the precise control of a filtration control system, the sludge within the reactor is separated, completing the sludge-water separation process. The separated effluent is then collected through an outlet pipe 22.

[0215] To maintain the cleanliness of membrane filtration assembly 2 and extend its operating cycle, filtration and relaxation operations are performed alternately, which helps reduce contamination of the membrane surface. The diffused gas generated by the biogas circulation system flushes the membrane filament surface of the membrane assembly in the anaerobic methanogenesis reaction tank 12. This design effectively prevents contaminants from adhering to the membrane surface and maintains membrane filtration efficiency.

[0216] Membrane filter 21 further reduces contamination through reciprocating motion. This motion is achieved by a slider 42 connected to a sliding platform 43 and a drive motor 41, which causes membrane filter 21 to move horizontally back and forth within the reaction tank. The inertia generated by this reciprocating motion helps control membrane fouling and reduces the accumulation of sludge on the membrane surface of membrane filter 21.

[0217] The transmembrane pressure difference is a key parameter for monitoring membrane filtration performance and is monitored in real time by an external pressure monitoring system. When the transmembrane pressure difference reaches 30 kPa, the system will automatically start the shutdown maintenance process. During the maintenance process, the feed is stopped and the backwash chemical cleaning liquid is injected through the backwash pipeline to allow the cleaning liquid to fully contact the membrane filaments and dissolve the pollutants between the membrane filaments. At the same time, the reciprocating drive assembly 4 is started to use the inertia of the membrane filament shaking to remove the mud cake layer on the membrane surface and restore the filtration performance of the membrane. This comprehensive maintenance strategy ensures the long-term stable operation of the membrane filtration system and maintains the efficient effluent treatment capacity of the anaerobic methanogenesis reaction tank 12.

[0218] Example

[0219] In this embodiment, the anaerobic biological reaction system 100 is used to treat organic solid waste and wastewater.

[0220] Treatment method:

[0221] Organic solid waste and wastewater: kitchen waste slurry.

[0222] The treated organic load in the anaerobic methanogenesis reaction tank 12 was 10.4 g COD / L / d, and the influent concentration was 120.7 g COD / L.

[0223] The hydraulic retention time of the substrate in the anaerobic hydrolysis and acidification reaction tank 11 is 5 days.

[0224] After the food waste slurry is fermented in the anaerobic hydrolysis and acidification reaction tank 11, the fermentation liquid enters the anaerobic methanogenesis reaction tank 12 through the overflow hole 131 between the two tanks. The hydraulic retention time of the substrate in the anaerobic methanogenesis reaction tank 12 is 14 days, and the sludge age of the microorganisms is 70 days.

[0225] The gas circulation rate in the anaerobic hydrolysis acidification reaction tank 11 and the anaerobic methanogenesis reaction tank 12 is 0.5 L / L.

[0226] The membrane fibers of the hollow fiber membrane unit 211 in the membrane filtration device 21 in the filtration assembly 2 are PTFE hollow fiber membranes. During the membrane filtration stage, the filtration flux is 3 liters / meter / hour.

[0227] After 5 minutes of filtration in each filtration cycle, the membrane filtration device 21 in the filtration assembly 2 is subjected to 15 minutes of membrane relaxation to restore the filtration performance of the membrane and delay the rapid formation of mud cake layer contamination.

[0228] The membrane filtration device 21 is driven by the slider 42 of the reciprocating drive assembly 4 to perform horizontal reciprocating motion, and each reciprocating motion cycle is 4.5 seconds.

[0229] During the 90-day operation period, membrane fouling did not reach the cleaning threshold and the performance was stable ( Figure 7 The COD removal rate of filtered water is as high as 97% ( Figure 8 Each liter of reactor (methane production phase) produces 5.0 L of biogas per day, and the methane conversion rate is 0.27 L of methane per 1 g of COD, which is close to the theoretical maximum value of 0.35 L ( Figure 9 ).

[0230] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An anaerobic biological reaction system for treating organic solid waste and wastewater, characterized in that: include: Reaction tank body, filtration components and biogas circulation components; The reaction tank body includes an anaerobic hydrolysis and acidification reaction tank and an anaerobic methanogenesis reaction tank, which are arranged based on the treatment flow direction of the organic solid waste and wastewater and are connected in sequence; wherein the material in the anaerobic hydrolysis and acidification reaction tank can overflow into the anaerobic methanogenesis reaction tank; a partition is provided between the anaerobic hydrolysis and acidification reaction tank and the anaerobic methanogenesis reaction tank; the partition is provided with an overflow hole; the overflow hole includes an orifice and a controllable switch hole cover provided on the orifice and capable of closing the orifice; The filtering component can perform membrane separation treatment on the mud-water mixture in the anaerobic methanogenesis reaction tank, and can discharge the filtrate produced by the membrane separation treatment from the anaerobic methanogenesis reaction tank; The biogas circulation component is connected to both the anaerobic hydrolysis and acidification reaction tank and the anaerobic methanogenesis reaction tank, and is used to collect the biogas generated in the anaerobic hydrolysis and acidification reaction tank and the anaerobic methanogenesis reaction tank, and return the biogas to the anaerobic hydrolysis and acidification reaction tank and the anaerobic methanogenesis reaction tank.

2. The anaerobic bioreactor system according to claim 1, wherein: The material in the anaerobic hydrolysis and acidification reaction tank can overflow into the anaerobic methanogenesis reaction tank through the overflow hole.

3. The anaerobic bioreactor system according to claim 1, wherein: The anaerobic hydrolysis and acidification reaction tank is provided with a feed pipeline.

4. The anaerobic bioreactor system according to claim 1, wherein: The anaerobic methanogenesis reaction tank is provided with a mud discharge pipeline.

5. The anaerobic bioreactor system according to claim 1, wherein: The partition is provided with a plurality of overflow holes in a vertical direction perpendicular to the overflow direction of the material from the anaerobic hydrolysis and acidification reaction tank toward the anaerobic methanogenesis reaction tank.

6. The anaerobic bioreactor system according to claim 1, wherein: The filtration assembly includes a membrane filtration device, a water outlet pipeline and a filtration pump; The membrane filtration device is arranged in the anaerobic methanogenesis reaction tank; The outlet pipe is connected to the membrane filtration device and is used to lead out the filtrate produced by the anaerobic methanogenesis reaction tank after the membrane separation treatment of the filtration component; The filter pump is connected to the water outlet pipeline.

7. The anaerobic bioreactor system according to claim 6, characterized in that: The filter assembly also includes a filter control device electrically connected to the filter pump.

8. The anaerobic bioreactor system according to claim 6, wherein: The filter assembly further includes a pressure monitoring device disposed on the water outlet pipe.

9. The anaerobic bioreactor system according to claim 6, wherein: The membrane filtration device includes a filtration body and a plurality of hollow fiber membrane units arranged in the filtration body.

10. The anaerobic bioreactor system according to claim 9, characterized in that: The filter material in the hollow fiber membrane unit is made of PVDF and / or PTFE.

11. The anaerobic bioreactor system according to claim 6, wherein: The filter assembly also includes a backwash device; The backwash device includes a backwash pipeline and a backwash pump connected to the backwash pipeline; The backwash pipeline is connected to the top of the membrane filtration device, and the backwash pipeline is provided with a backwash liquid for backwashing the membrane filtration device; The flow direction of the backflushing liquid is opposite to the flow direction of the filtrate in the outlet pipe.

12. The anaerobic bioreactor system according to claim 1, wherein: The biogas circulation assembly includes a gas collection pipeline, a gas circulation pump and a gas diffusion device; The front end of the gas collection pipeline is connected to both the anaerobic hydrolysis and acidification reaction tank and the anaerobic methanogenesis reaction tank, and is used to receive the biogas generated in the anaerobic hydrolysis and acidification reaction tank and the anaerobic methanogenesis reaction tank; The gas circulation pump is arranged on the gas collecting pipeline; The gas diffusion device is connected to the tail end of the gas collecting pipeline and is respectively placed in the anaerobic hydrolysis acidification reaction tank and the anaerobic methanogenesis reaction tank.

13. The anaerobic bioreactor system according to claim 12, wherein: The biogas circulation component further comprises a gas one-way valve arranged on the gas collection pipeline.

14. The anaerobic bioreactor system according to claim 12, wherein: The biogas circulation component further includes a gas flow valve arranged on the gas collection pipeline.

15. The anaerobic bioreactor system according to claim 12, wherein: A biogas collecting pipeline is also provided at the upper end of the anaerobic methanogenesis reaction tank.

16. The anaerobic bioreactor system according to claim 12, wherein: The gas collection pipeline includes a main pipeline, and a first collection pipe and a second collection pipe both connected to the main pipeline; The first collecting pipe is connected to the top of the anaerobic methanogenesis reaction tank; The second collecting pipe is connected to the top of the anaerobic hydrolysis and acidification reaction tank.

17. The anaerobic bioreactor system according to claim 11, wherein: The anaerobic bioreactor system further includes a reciprocating drive assembly; The reciprocating drive assembly is connected to the membrane filtration device and is used to control the membrane filtration device to move back and forth in the anaerobic methanogenesis reaction tank.

18. The anaerobic bioreactor system according to claim 17, wherein: The reciprocating drive assembly includes a drive motor, a slider, a sliding platform and a movement control device; The movement control device is electrically connected to the drive motor; the slider is connected to the membrane filtration device; The slider is arranged on the sliding platform and can drive the membrane filtration device to move along the length direction of the sliding platform based on the control of the movement control device and the drive of the drive motor.

19. A method for treating organic solid waste and wastewater, based on the anaerobic biological reaction system according to any one of claims 1 to 18, characterized in that: include: The organic solid waste and wastewater enter the anaerobic hydrolysis and acidification reaction tank in the reaction tank body through the feed pipeline to undergo hydrolysis and acidification to produce fermentation liquid; The fermentation liquid overflows from the anaerobic hydrolysis and acidification reaction tank into the anaerobic methanogenesis reaction tank for methanogenesis to form a mud-water mixture, and small molecular organic matter in the mud-water mixture is converted into methane and carbon dioxide; wherein the mud-water mixture in the anaerobic methanogenesis reaction tank is subjected to membrane separation treatment by a filtration component, and the filtrate produced by the membrane separation treatment is discharged from the anaerobic methanogenesis reaction tank; The biogas generated in the anaerobic hydrolysis and acidification reaction tank and the anaerobic methanogenesis reaction tank are collected respectively by a biogas circulation component, and the biogas is fed back to the anaerobic hydrolysis and acidification reaction tank and the anaerobic methanogenesis reaction tank to be mixed with the mud-water mixture.

20. The method for treating organic solid waste and wastewater according to claim 19, wherein: The method for treating organic solid waste and wastewater also includes: The membrane filtration device is controlled to switch back and forth between the membrane filtration state and the membrane relaxation state through the pressure monitoring device and the filtration pump on the outlet pipe of the filtration component, so as to perform the membrane separation treatment on the mud-water mixture.

21. The method for treating organic solid waste and wastewater according to claim 20, wherein: The time ratio of the membrane filtration state to the membrane relaxation state is numerically no greater than 1 / 3.

22. The method for treating organic solid waste and wastewater according to claim 20, wherein: The method for treating organic solid waste and wastewater also includes: The transmembrane pressure difference is collected in real time or at regular intervals by the pressure monitoring device; When the transmembrane pressure difference reaches the preset shutdown threshold, the shutdown maintenance process is entered.

23. The method for treating organic solid waste and wastewater according to claim 22, wherein: The preset shutdown threshold is 30kPa.

24. The method for treating organic solid waste and wastewater according to claim 22, wherein: The shutdown maintenance process includes: Stop feeding, and inject a backwash chemical cleaning liquid into the membrane filtration device through a backwash pump in the backwash device through a backwash pipeline, so that the backwash chemical cleaning liquid contacts the membrane fibers in the filter material of the membrane filtration device; The reciprocating drive assembly is turned on, and the slider is driven by the driving motor to drive the membrane filtration device to move back and forth along the length direction of the sliding platform, so that the membrane filaments in the filter material of the membrane filtration device remove the mud cake layer on the surface of the membrane filaments through the inertia of shaking, and return to execute the real-time or periodic collection of the transmembrane pressure difference by the pressure monitoring device.

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