Organic solid waste and wastewater treatment method and anaerobic biological reaction system thereof

Abstract

The invention provides an organic solid waste and wastewater treatment method and an anaerobic biological reaction system thereof, and relates to the technical field of anaerobic reactor fermentation. The anaerobic biological reaction system comprises a reaction tank main body, a filtering assembly and a biogas circulating assembly, the reaction tank main body comprises an anaerobic hydrolysis acidification reaction tank and an anaerobic methanogenesis reaction tank; the filtering assembly can be used for carrying out membrane separation treatment on a mud-water mixture and can be used for discharging filtrate from the anaerobic methanogenesis reaction tank; and the biogas circulation assembly is connected with the anaerobic hydrolysis acidification reaction tank and the anaerobic methanogenesis reaction tank and is used for collecting biogas and returning the biogas. The reciprocating type driving assembly drives the membrane filtering device to move in a reciprocating mode, and mud cake layers on the surfaces of the membrane filaments are removed through shaking inertia. Through comprehensive optimization of structural design, membrane separation treatment and biogas recycling, the efficiency of organic solid waste and wastewater treatment is improved, the effluent quality is improved, the energy recovery capacity is enhanced, and remarkable environmental and economic benefits are shown.

Description

Technical Field

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

[0002] As an effective means of converting organic waste into energy substance methane, anaerobic digestion technology is widely used in the treatment of sludge, sewage, organic waste liquid and organic solid waste around the world. This technology relies on the metabolic activities of anaerobic microorganisms to decompose complex organic matter into methane, achieving waste resource utilization and environmental sustainability. However, despite the significant environmental and economic benefits of anaerobic digestion technology, it still faces a series of technical and operational challenges in practical applications.

[0003] At present, the single-phase completely mixed anaerobic reactor is a more common form of anaerobic digestion technology. This reactor is simple in design and easy to operate, but it shows obvious limitations in treating high-concentration organic wastewater and solid waste. Since 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, it is difficult for single-phase reactors to provide the best growth and metabolic environment for microorganisms at different stages. In addition, the poor settling performance of sludge leads to a high content of functional microorganisms and unused organic substrates in the effluent, affecting the efficiency of anaerobic digestion.

[0004] Another drawback of the prior art 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 a large amount of organic solid waste and wastewater, and it is prone to acidification, resulting in a decrease 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 fully mixed anaerobic reactors have multiple defects when treating high-concentration organic solid waste and wastewater, including difficulty in providing the best environment for microorganisms at different stages, poor sludge settling performance, a large amount of unused organic substrates and functional microorganisms in the effluent, insufficient adaptability to high-load conditions, large footprint, poor effluent water quality and poor system stability. These problems lead to low substrate utilization efficiency, poor effluent water quality and insufficient system stability, which seriously limit the application and development of anaerobic digestion technology in the field of organic solid waste and wastewater treatment. Therefore, the development of a new anaerobic digester system to adapt to high-load conditions, improve effluent water quality and system stability has become a technical problem that needs to be solved urgently 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 the 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 particularly 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 comprises 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 acidification reaction tank and the anaerobic methanogenesis reaction tank, and is used to collect the biogas generated in the anaerobic hydrolysis acidification reaction tank and the anaerobic methanogenesis reaction tank, and return the biogas to the anaerobic hydrolysis acidification reaction tank and the anaerobic methanogenesis reaction tank.

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

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

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

[0017] In an optional embodiment, the anaerobic hydrolysis 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 oxygen 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 disposed 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 water outlet pipeline 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 disposed on the water outlet pipeline;

[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 backwashing device comprises a backwashing pipeline and a backwashing pump connected to the backwashing 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 water outlet pipeline.

[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 acidification reaction tank and the anaerobic methanogenesis reaction tank, and is used to receive the biogas generated in the anaerobic hydrolysis acidification reaction tank and the anaerobic methanogenesis reaction tank;

[0035] The gas circulation pump is arranged on the gas collection 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 comprises a gas flow valve provided on the gas collection pipeline;

[0039] In an optional embodiment, a biogas collection pipeline is also 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 methanogenic reaction tank;

[0042] The second collecting pipe is connected to the top of the anaerobic hydrolysis 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 driving motor; the slider is connected to the membrane filtration device;

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

[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 acidification reaction tank into the anaerobic methanogenesis reaction tank 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 is subjected to membrane separation treatment by a filtering component, and the filtrate generated by the membrane separation treatment is discharged from the anaerobic methanogenesis reaction tank;

[0051] The biogas generated in the anaerobic hydrolysis acidification reaction tank and the anaerobic methanogenesis reaction tank are respectively collected by a biogas circulation component, and the biogas is fed back to the anaerobic hydrolysis 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, so as to perform 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 higher 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 a preset shutdown threshold, the shutdown maintenance process is entered;

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

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

[0060] Stop feeding, and inject the backwashing chemical cleaning liquid from the backwashing pipeline into the membrane filtration device through the backwashing pump in the backwashing device, so that the backwashing 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 reciprocate along the length direction of the sliding platform, so that the membrane filaments in the filter material of the membrane filtration device can 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 trans-membrane pressure difference through 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 realizes the optimal configuration of the anaerobic hydrolysis acidification reaction tank and the anaerobic methanogenic reaction tank through its innovative structural design, and uses a baffle and overflow holes of different heights to accurately control the flow of materials, thereby simplifying the reactor structure and enhancing the flexibility of operation. This design creates the best growth and metabolic environment for acidogenic 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 methanogenic reaction tank, improves the sludge treatment efficiency and effluent water quality, reduces the organic load in the sludge, and is conducive to 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, improves the methanogenic efficiency, reduces the emission of biogas, and reduces the 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, showing significant environmental and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0065] Figure 1 A 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 schematic diagram of a baffle (without a controllable switch hole cover at the hole opening) of an anaerobic biological reaction system in an embodiment of the present application;

[0067] Figure 3 It is a front view structural schematic diagram of a baffle (with a controllable switch hole cover at the hole opening) 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 It is a side view structural schematic diagram of the membrane filtration device of the anaerobic biological reaction system in the 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 relaxation 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] Fig. 9 It is the biogas and methane production efficiency of the anaerobic biological reaction system in the embodiment of the present application operating under high load conditions.

[0074] Main component symbol description: 100-anaerobic biological reaction system; 1-reaction tank body; 11-anaerobic hydrolysis acidification reaction tank; 12-anaerobic methanogenesis reaction tank; 13-partition plate; 131-overflow hole; 1311-orifice; 1312-controllable switch hole cover; 14-feed pipeline; 15-sludge pipeline; 2-filtration component; 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 assembly; 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-mobile control device. DETAILED DESCRIPTION

[0075] The embodiments of the present invention will be described in detail below in conjunction with the examples, but it will be appreciated by those skilled in the art that the following examples are only used to illustrate the present invention and should not be considered as limiting the scope of the present invention. If no specific conditions are specified in the examples, the conditions are carried out according to normal conditions or the conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be obtained commercially.

[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, and includes: a reaction tank body 1, a filtering component 2 and a biogas circulation component 3; the reaction tank body 1 includes an anaerobic hydrolysis 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 acidification reaction tank can overflow into the anaerobic methanogenesis reaction tank 12.

[0077] The filtering 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 acidification reaction tank 11 and the anaerobic methanogenesis reaction tank 12, and is used to collect the biogas generated in the anaerobic hydrolysis acidification reaction tank 11 and the anaerobic methanogenesis reaction tank 12, and return the biogas to the anaerobic hydrolysis acidification reaction tank 11 and the anaerobic methanogenesis reaction tank 12.

[0079] As mentioned above, organic solid waste and wastewater refer to wastes with a high content of organic matter. These substances can be carbon-based compounds that are widely present in nature. They can be decomposed by microorganisms and converted into methane and other small molecules during anaerobic digestion. The specific types of organic solid waste and wastewater can be very diverse, for example, they can include but are not limited to different forms such as waste liquid, sewage, sludge, and solid waste.

[0080] As mentioned above, the reaction tank body 1 is composed of an anaerobic hydrolysis 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 the material 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 the best growth environment for different microorganisms. This structure is simple and flexible in operation, and the hydraulic retention time and sludge retention time can be adjusted as needed to meet 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 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 best environment, and improves the treatment efficiency and system stability.

[0081] For example, the anaerobic hydrolysis acidification reaction tank 11 can be designed as a container with a certain volume, in which a stirrer is installed to promote the mixing of materials and microorganisms. Overflow can be achieved through structures such as overflow holes 131 and overflow channels to control the flow of materials from the anaerobic hydrolysis 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, which 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 / solid waste is input into the anaerobic hydrolysis acidification reaction tank 11 as the reaction substrate, which contains various organic substances, such as but not limited to food residues, agricultural waste, industrial organic wastewater, various solid wastes, etc. After treatment, hydrolysis products are obtained, which may include small molecular organic matter, hydrolysis products, biogas, etc. Such as amino acids, fatty acids, monosaccharides and other low molecular organic acids produced after hydrolysis; in the acidification process, organic acids such as acetic acid, propionic acid, butyric acid, etc. are further produced; biogas (mainly hydrogen and carbon dioxide) is the conversion of part of organic matter into hydrogen and carbon dioxide during the hydrolysis acidification process, and these gases can be used by methanogenic bacteria in the subsequent methanogenic reaction tank.

[0084] As mentioned above, the anaerobic methanogenic reaction tank 12 may contain pre-placed methanogenic bacteria, which convert small molecular organic matter, hydrogen and carbon dioxide in the hydrolysis acidification reaction tank into methane. During the treatment process, it may also include receiving the overflowed hydrolysis acidification products, that is, small molecular organic matter overflowing from the anaerobic hydrolysis acidification reaction tank 11, such as acetic acid, propionic acid, butyric acid, etc.; biogas (mainly methane and carbon dioxide), the activity of methanogenic bacteria leads to the production of methane, which is the main goal of the anaerobic digestion process, because methane is a valuable energy source; the remaining organic matter, the organic matter that has not been completely converted, may include some difficult-to-degrade compounds; and, it may also include sludge, the solid residue produced during the reaction process, including microbial cells and unconverted organic matter. Thus, a mud-water mixture is formed in the anaerobic methanogenic 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, the filter assembly 2 is responsible for membrane separation treatment of the sludge-water mixture in the anaerobic methanogenic reaction tank 12 and discharges the filtrate. This improved treatment is achieved through membrane filtration technology, which improves the separation efficiency. The filter assembly 2 solves the problem of organic load in the sludge, reduces the organic substrate in the sludge, is beneficial to subsequent treatment, and improves the energy recovery capacity of the system.

[0087] The biogas circulation component 3 connects the anaerobic hydrolysis 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 the utilization rate of energy by recycling biogas. The biogas circulation component 3 may include structures such as pipelines, circulation pumps, and diffusion devices. These components work together to achieve biogas collection and uniform gas distribution, thereby improving the efficiency of methanogenesis. The biogas circulation component 3 solves the problem of biogas emissions and reduces environmental pollution. At the same time, by recirculating biogas, the mixing of microorganisms and materials in the reaction tank is increased, thereby improving the efficiency of methanogenesis.

[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 acidification reaction tank 11 and the anaerobic methanogenesis reaction tank 12. An overflow hole 131 is provided on the partition 13. The material in the anaerobic hydrolysis 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 acidification reaction tank 11) and the methanogenic phase reaction tank (anaerobic methanogenic reaction tank 12) in the reaction tank body 1 in the embodiment of the present application are separated by a partition 13. The partition 13 is a physical barrier arranged between the anaerobic hydrolysis acidification reaction tank 11 and the anaerobic methanogenic reaction tank 12, which separates the two reaction tanks and allows materials to flow from one reaction tank to another.

[0091] The partition 13 is provided with overflow holes 131, which allow the material in the anaerobic hydrolysis 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 the continuous flow of materials. This structure solves the problems of uneven material mixing and unsuitable microbial growth environment in traditional single-phase reactors, provides more precise control of hydraulic retention time and sludge retention time, thereby optimizing the anaerobic digestion process.

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

[0093] As mentioned above, the feed pipeline 14 is a pipeline connected to the anaerobic hydrolysis acidification reaction tank 11, which is used to input organic solid waste and wastewater into the reaction tank. The design of the feed pipeline 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 methanogenic 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 methanogenic phase (anaerobic methanogenic 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 oxygen hydrolysis acidification reaction tank toward the anaerobic methanogenesis reaction tank 12 .

[0097] As mentioned above, the overflow direction of the material from the oxygen hydrolysis acidification reaction tank to the anaerobic methanogenesis reaction tank 12 is the horizontal flow direction, and the direction perpendicular to it is the longitudinal direction. A plurality of overflow holes 131 are provided on the partition 13, 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, the 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 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 used, but are not limited to:

[0103] (1) Centralized control system: A centralized control system can be designed, which can be manual or automatic, for unified control of 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 cover 1312 of each overflow hole 131 through a mechanical linkage or a hydraulic / pneumatic system. It is convenient for operators to control all overflow holes 131 from one location. Accurate and synchronized operation can be achieved.

[0104] (2) Electric or pneumatic actuator: Electric or pneumatic actuators can be installed on the controllable switch hole cover 1312 of each overflow hole 131, and these actuators can be remotely controlled to open or close the hole cover. Fast and precise control can be achieved. It is suitable for automatic control and reduces manual operation.

[0105] (3) Linkage mechanism: A set of linkage mechanisms can be used so that the operation of a main control lever can be simultaneously transmitted to the controllable switch hole covers 1312 of all overflow holes 131 to achieve 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 direction of the hydraulic oil through a main control valve, thereby controlling the hydraulic cylinder connected to each overflow hole 131 and the controllable switch hole cover 1312 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 switch state of the overflow hole 131 according to the liquid level information. Intelligent control based on real-time data can be achieved. The hydraulic retention time and sludge retention time can be optimized to improve the treatment efficiency.

[0108] (6) Mechanical linkage switch: A mechanical linkage switch system is designed, similar to the linkage mechanism of an old faucet, which drives a series of gears and levers by rotating a central knob to control the controllable switch hole covers 1312 of all overflow holes 131. It has a compact structure and is easy to maintain. It can provide intuitive control feedback.

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

[0110] Through the above solution, accurate 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 filter assembly 2 includes a membrane filter device 21, an outlet pipe 22 and a filter pump 23. The membrane filter device 21 is disposed in the anaerobic methanogenic reaction tank 12. The outlet pipe 22 is connected to the membrane filter device 21, and is used to lead out the filtrate generated by the membrane separation treatment of the anaerobic methanogenic reaction tank 12 by the filter assembly 2; 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 disposed on the water outlet pipeline 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 for membrane separation treatment of the mud-water mixture.

[0117] The membrane filtration device 21 includes a filtration body and a plurality of hollow fiber membrane units 211 disposed in the filtration body. 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, ammonia nitrogen, etc., thereby improving system stability.

[0119] The outlet pipe 22 is connected to the membrane filtration device 21, and is used to lead the filtrate produced after the membrane separation treatment from the anaerobic methanogenic reaction tank 12. The structure and advantages of the structure: The design of the outlet pipe 22 allows the filtrate to be effectively discharged, reducing the retention time of the liquid in the reaction tank and improving the treatment efficiency. By discharging the filtrate in time, the accumulation of organic matter in the reaction tank can be reduced, the reactor overload can be avoided, and the organic load in the sludge can be reduced, which is conducive to the stabilization of the sludge.

[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 taken out from the reactor, it is connected to the water outlet pipeline 22, the pressure monitoring system, the filtration pump 23 and the filtration control device 24.

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

[0122] The filter control device 24 is electrically connected to the filter pump 23 and is used to control the operation of the filter pump 23, thereby controlling the filtering process. The filter control device 24 can be automated and adjust the working state of the filter pump 23 according to a preset program or real-time data (such as data from the pressure monitoring device 25). The filter control device 24 provides precise control of the filtering process, optimizes filtering efficiency and energy consumption, and prolongs the service life of the membrane filter 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] The pressure monitoring device 25 is provided on the outlet pipe 22 to monitor the pressure change during the membrane filtration process. The pressure monitoring device 25 can provide real-time feedback on the working status of the membrane filtration device 21, such as the transmembrane pressure difference. By monitoring the pressure change, the blockage or other abnormal conditions of the membrane filtration device 21 can be discovered in time, and cleaning or maintenance can be performed in time to ensure the continuity and stability of the filtration process.

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

[0126] In summary, the filter component 2 realizes efficient membrane separation treatment of the mud-water mixture in the anaerobic methanogenesis reaction tank 12 through the design of its membrane filter device 21, outlet pipe 22, filter pump 23, filter control device 24 and pressure monitoring device 25, thereby improving the effluent water quality; the filter component 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 to improve 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 backwashing device 26; the backwashing device 26 includes a backwashing pipeline 261 and a backwashing pump 262 connected to the backwashing pipeline 261; the backwashing pipeline 261 is connected to the top of the membrane filtration device 21, and the backwashing pipeline 261 is provided with a backwashing liquid for backwashing the membrane filtration device 21; the flow direction of the backwashing liquid is opposite to the flow direction of the filtrate in the outlet pipeline 22.

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

[0129] The backwashing line 261 is a pipeline connecting the backwashing pump 262 and the membrane filtration device 21, and is used to transport the backwashing liquid to the membrane filtration device 21. The design of the backwashing line 261 allows the backwashing liquid to directly reach the top of the membrane filtration device 21, realizing backwashing from top to bottom, and effectively removing pollutants on the membrane surface. This design solves the problem of decreased filtration efficiency caused by the accumulation of pollutants in traditional membrane filtration, and restores the filtration performance of the membrane through backwashing.

[0130] As mentioned above, the backwash pump 262 is a pump used to provide pressure to deliver the backwash liquid to the membrane filtration device 21. The design of the backwash pump 262 allows the operator to adjust the pressure and flow of the backwash liquid as needed to achieve effective cleaning of the membrane filtration device 21. The backwash pump 262 solves the problem that contaminants on the membrane surface are difficult to remove, and maintains the filtration efficiency of the membrane through regular backwashing, thereby extending the service life of the membrane.

[0131] For example, the backwashing 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 backwashing liquid can be evenly distributed to each membrane unit. The backwashing pump 262 can be electric, and its start and stop, as well as the pressure and flow rate of the backwashing liquid are controlled by the filtration control device 24. The backwashing liquid can be clean water, detergent solution or other suitable cleaning liquid, depending on the membrane material and the type of wastewater to be treated.

[0132] In summary, the backwash device 26 realizes efficient cleaning of the membrane filtration device 21 in the anaerobic methanogenic reaction tank 12 through the design of its backwash pipeline 261 and backwash pump 262, improves the filtration efficiency, prolongs the service life of the membrane, and reduces 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 collecting pipeline 31, a gas circulation pump 32 and a gas diffusion device 33; the front end of the gas collecting 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 arranged on the gas collecting pipeline 31; the gas diffusion device 33 is connected to the tail end of the gas collecting 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 collecting 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 methanogenic reaction tank 12;

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

[0140] As mentioned above, the gas collection pipeline 31 is a pipeline connecting the anaerobic hydrolysis acidification reaction tank 11 and the anaerobic methanogenesis reaction tank 12, and is used to receive the biogas produced in the two reaction tanks. The front end of the gas collection pipeline 31 is connected to the two reaction tanks, and the tail 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 efficient collection and reuse of biogas, improves the utilization rate of biogas, and reduces greenhouse gas emissions.

[0141] The gas circulation pump 32 is arranged on the gas collection pipeline 31 to promote the circulation of biogas in the system. The arrangement 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] The gas diffusion device 33 is connected to the tail end of the gas collection pipeline 31 and is placed in the anaerobic hydrolysis acidification reaction tank 11 and the anaerobic methanogenesis reaction tank 12 to uniformly release biogas into the reaction tank. The design of the gas diffusion device 33 enables the biogas to be evenly distributed in the reaction tank in the form of bubbles, which promotes full contact between microorganisms and biogas. This design improves the utilization efficiency of biogas in the anaerobic digestion process, helps to improve the methanogenesis efficiency and the processing capacity of the reaction tank.

[0143] The gas one-way valve 34 is arranged on the gas collecting pipeline 31 to prevent the backflow of biogas and ensure the one-way flow of biogas. The arrangement 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 adjust the flow of biogas. The provision of the gas flow valve 35 allows the operator to adjust the flow of biogas as required, thereby achieving precise control of the biogas cycle.

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

[0146] The biogas circulation component 3 realizes the efficient collection, circulation and utilization of the biogas produced in the anaerobic hydrolysis acidification reaction tank 11 and the anaerobic methanogenesis reaction tank 12 through its 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, thereby improving the utilization rate of biogas, reducing greenhouse gas emissions, optimizing the operating conditions of the reaction tank, and 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 vital role in the anaerobic biological reaction system 100, and is responsible for promoting the mixing of materials and microorganisms. The component collects the biogas produced during the fermentation process of the anaerobic hydrolysis acidification reaction tank 11, the main components of which are hydrogen and carbon dioxide, and the biogas produced by the anaerobic methanogenesis reaction tank 12, the main components of which are methane and carbon dioxide. These biogases are transported to the bottom of the reaction tank through the circulation pipeline and the gas circulation pump 32, and diffused through the gas diffusion device 33.

[0148] In this process, most of the biogas from the anaerobic hydrolysis acidification reaction tank 11 is recycled, and the hydrogen therein is further converted into methane in the anaerobic methanogenesis reaction tank 12. Only a part of the biogas produced in the anaerobic methanogenesis reaction tank 12 is recycled for material mixing, and the rest is captured through the biogas collection pipeline 36. The biogas flow in the anaerobic hydrolysis acidification reaction tank 11 and the anaerobic methanogenesis reaction tank 12 is precisely controlled by the gas flow valve 35 to ensure that the two reaction tanks can reach their most suitable mixing state, thereby optimizing the efficiency and performance of the entire anaerobic biological reaction 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 reciprocate 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 mobile control device 44; the mobile 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 mobile 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 membrane filtration device 21 to reciprocate 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 movement control device 44. These components together constitute a structure that can realize the dynamic movement of the membrane filter device 21, thereby improving the adaptability and efficiency of the membrane filter device 21. This design solves the problem of accumulation of pollutants on the membrane surface of the membrane filter device 21 that may occur during long-term operation, reduces membrane pollution through reciprocating movement, and prolongs the cleaning cycle and service life of the membrane.

[0153] The driving motor 41 is the power source of the reciprocating driving assembly 4, and is used to provide power to make the membrane filter device 21 reciprocate in the reaction tank. The slider 42 is a mechanical component connecting the driving motor 41 and the membrane filter device 21, and it moves along the sliding platform 43 to drive the membrane filter device 21 to reciprocate. The design of the slider 42 allows the membrane filter device 21 to move smoothly 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 direction of the reaction tank, so that when the machine needs to be shut down for maintenance or other related stages, the slider 42 can move to drive the membrane filter device 21 to move, causing the filter material therein to vibrate, thereby shaking off the adsorbed, adhered, and incidental pollutants.

[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 membrane filter device 21 to move back and forth. The movement control device 44 can be a PLC or other automatic 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, the device is usually an integrated control system, such as a programmable logic controller (PLC) or an industrial computer system. This integrated control method can simplify the design of the system, reduce the amount of hardware, reduce costs, and improve the compactness and ease of operation of the system.

[0158] When the mobile control device 44 and the filter control device 24 are different devices, each device has a dedicated control function, usually to meet specific control requirements and improve control accuracy. This separate control method can provide higher 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 device 44 and the filtration control device 24 in the anaerobic bioreactor system 100. The tablet computer is connected to the sensors and actuators on site through a wireless or wired communication module, receives data from the pressure monitoring and liquid level sensors, and dynamically adjusts the working status of the filtration pump 23 and the backwash pump according to this information. The user interface intuitively displays all operating parameters and system status, allowing the operator to directly adjust the filtration parameters, such as the operating speed of the pump and the movement frequency of the membrane filtration device 21, through the touch screen. In addition, the software of the tablet computer can record operating data, historical trends, realize fault diagnosis, and promptly notify the operator when the system is abnormal. This integrated control solution not only reduces the need for on-site control cabinets and multiple control units, simplifies operation and maintenance, but also improves the flexibility and user-friendliness of the system. The mobility and remote monitoring capabilities of the tablet computer allow the operator to monitor the system status in the control room or at a remote location, improving the convenience and efficiency of operation.

[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 also provided, based on the anaerobic biological reaction system 100 described in any one 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 acidification reaction tank 11 through the feed pipeline 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 methanogenesis 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 pipeline 14 can be equipped with a control valve to adjust the feed speed 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 processes to produce fermentation liquid. This step converts complex organic matter into simple organic matter through the action of microorganisms. The production of fermentation liquid provides the necessary substrate for the subsequent methanogenic reaction, which has the advantage of improving the energy recovery efficiency and treatment efficiency of the entire system.

[0167] The hydrolysis acidification process can be optimized by controlling the temperature, pH 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 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 filtering component 2, and the filtrate generated by the membrane separation treatment is discharged from the anaerobic methanogenesis reaction tank 12.

[0169] As described above, the fermentation liquid enters the anaerobic methanogenic reaction tank 12 from the anaerobic hydrolysis acidification reaction tank 11 through the overflow hole 131. In this step, the fermentation liquid is mixed with the mud-water mixture in the anaerobic methanogenic reaction tank 12. This step realizes the smooth transfer of the fermentation liquid to the anaerobic methanogenic reaction tank 12, which has the advantage of providing a continuous substrate supply for the methanogenic reaction, thereby 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 methanogenic 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 component 2 performs membrane separation treatment on the mud-water mixture in the anaerobic methanogenic reaction tank 12, converting small molecular organic matter into methane and carbon dioxide, and discharging the filtrate at the same time. The result of this step is clean filtrate and methane-rich biogas. The advantages are that the effluent quality is improved, the burden of sludge treatment is reduced, and valuable energy: methane is recovered.

[0172] Solid-liquid separation can be achieved by a membrane filtration device 21, wherein the hollow fiber membrane unit 211 is made of PVDF and / or PTFE to improve filtration efficiency and durability. The filtration pump 23 and the outlet pipe 22 are responsible for leading out the filtrate, while the pressure monitoring device 25 monitors the pressure change during the filtration process.

[0173] Step S3, using the biogas circulation component 3 to collect the biogas produced in the anaerobic hydrolysis acidification reaction tank 11 and the anaerobic methanogenesis reaction tank 12 respectively, and returning the biogas to the anaerobic hydrolysis acidification reaction tank 11 and the anaerobic methanogenesis reaction tank 12 to mix with the mud-water mixture.

[0174] As mentioned above, the biogas circulation component 3 collects the biogas produced in the anaerobic hydrolysis acidification reaction tank 11 and the anaerobic methanogenesis reaction tank 12, and returns the biogas to the reaction tank to mix with the mud-water mixture. The result of this step is to improve the utilization rate of biogas, and promote the mixing of materials and microorganisms in the reaction tank through biogas circulation, which has the advantage of increasing methane production and improving the overall efficiency of the system.

[0175] Biogas circulation can be achieved through a gas collection pipeline 31, a gas circulation pump 32 and a gas diffusion device 33. A gas one-way valve 34 and a gas flow valve 35 are used to control the flow direction and flow rate of biogas. The design of the biogas collection pipeline 36 needs to take into account the structure and layout of the reaction tank to ensure that the biogas can be efficiently collected and distributed.

[0176] In short, through a series of continuous steps, effective treatment and resource recovery of organic solid waste and wastewater are achieved. Each step is targeted at 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 membrane filtration device 21 is controlled to switch back and forth between the membrane filtration state and the membrane relaxation state through the pressure monitoring device 25 and the filter pump 23 on the outlet pipe 22 of the filter assembly 2, so as to perform membrane separation treatment on the mud-water mixture. By switching between the membrane filtration state and the membrane relaxation state, the pollution and blockage of the membrane surface can be effectively reduced, the cleaning cycle and service life of the membrane can be extended, and the filtration efficiency and the effluent quality can be guaranteed at the same time.

[0180] The state switching can be realized by 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 rises 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 time ratio of the membrane filtration state and the membrane relaxation state is numerically no higher than 1 / 3.

[0182] As mentioned above, the ratio of the time of the membrane filtration state to the membrane relaxation state is not higher than 1 / 3, which means that the membrane relaxation state is relatively long to ensure that the membrane surface has enough time to recover and reduce pollution. This time ratio control can optimize the filtration efficiency and membrane cleanliness, reduce the maintenance requirements caused by membrane pollution, and improve the stability and reliability of the entire system.

[0183] Above, T 过滤 The 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 value 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 a 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, and the time ratio of membrane filtration and membrane relaxation is usually controlled to 1 / 3, or lower. Through these 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. This method not only improves the treatment efficiency, but also reduces maintenance costs, and enhances 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 at regular intervals through the pressure monitoring device 25.

[0191] The above steps involve using a pressure monitoring device 25 to measure the transmembrane pressure difference in the membrane filtration device 21, that is, the pressure difference generated when the liquid passes through the membrane during the filtration process. By monitoring the transmembrane pressure difference, the working state of the membrane filtration device 21 can be understood in real time, and changes in filtration efficiency can be discovered in time, thereby preventing excessive contamination and clogging of the membrane.

[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 starts the shutdown maintenance process to prevent the performance of the membrane filtration device 21 from deteriorating. 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 the transmembrane pressure (TMP) is a key performance indicator in the membrane filtration process. It directly reflects the degree of membrane surface contamination. As the accumulation of pollutants increases the resistance of liquid passing through the membrane, the transmembrane pressure will rise, thereby timely detecting and treating membrane contamination. In addition, the increase in transmembrane pressure usually indicates a decrease in filtration efficiency. When it exceeds the preset threshold, it means that the membrane filtration capacity is impaired and needs to be cleaned or maintained. Monitoring the transmembrane pressure difference helps prevent excessive pressure from causing damage or rupture to the membrane material, while optimizing the cleaning effect, reducing the frequency and intensity of cleaning, and extending the service life of the membrane. As a quantifiable parameter, the transmembrane pressure difference is easy to realize automated control, enabling the system to automatically execute the shutdown maintenance process based on real-time data, reduce manual intervention, and improve the convenience and safety of operation. Timely shutdown maintenance avoids the reduction in efficiency of the entire anaerobic biological reaction system 100 due to the decline in membrane performance, reduces the cost of replacing the membrane, and ensures that the quality of the filtered water meets the 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 that the entire anaerobic biological reaction system 100 operates efficiently and stably.

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

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

[0197] Step S61 , stopping feeding, injecting the backwash chemical cleaning liquid from the backwash pipeline 261 into the membrane filter device 21 through the backwash pump 262 in the backwash device 26 , so that the backwash chemical cleaning liquid contacts the membrane fibers in the filter material of the membrane filter device 21 .

[0198] As described above, in the shutdown maintenance process, the backwashing chemical cleaning liquid is injected into the membrane filtration device 21 through the backwashing pump 262 in the backwashing device 26 to clean the membrane surface. This step can effectively remove pollutants on the membrane surface and restore the filtration performance of the membrane.

[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] Step S62, start the reciprocating drive assembly 4, drive the slider 42 through 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 fibers in the filter material of the membrane filtration device 21 remove the mud cake layer on the surface of the membrane fibers 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 movement 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 pollution, which has low energy consumption and higher efficiency, can greatly alleviate the membrane pollution and extend the filtration cycle. The control system is used to adjust the reciprocating motion parameters to make 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 a suitable hydrolysis acidification efficiency.

[0208] Organic solid waste and wastewater first enter the anaerobic hydrolysis acidification reaction tank 11 through the feed pipeline 14 system. In 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 material stirring in the anaerobic hydrolysis acidification reaction tank 11 mainly relies on the biogas generated during the reaction process. The biogas is collected by 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 acidification reaction tank. The aeration flow is accurately 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 in the hydrolysis 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 recycling biomass energy.

[0211] After the fermentation liquid completes the initial conversion in the anaerobic hydrolysis acidification reaction tank 11, it flows into the anaerobic methanogenesis reaction tank 12 through the overflow port. In this process, the small molecular organic matter in the fermentation liquid is further acted upon by microorganisms and converted into biogas whose main components are methane and carbon dioxide, which is then recovered through the gas collection pipeline system 31. The design of the anaerobic methanogenesis reaction tank 12 takes into account two key parameters: hydraulic retention time and organic load, to meet different treatment requirements.

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

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

[0214] In the anaerobic methanogenic reaction tank 12, a filter assembly 2 is installed for effective effluent treatment. The membrane filtration device 21 in the filter assembly 2 adopts a hollow fiber membrane design, and the membrane area is designed according to the required filtration flux. For the treatment of high-concentration organic solid waste, the filtration flux is set at 1-5 liters / meter / hour. Under the suction action of the filter pump 23 and the precise control of the filtration control system, the sludge in the reactor is separated, completing the mud-water separation process, and the separated effluent is collected through the effluent pipeline 22.

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

[0216] The membrane filter device 21 further reduces pollution by reciprocating motion, which is achieved by a slider 42 connected to a sliding platform 43 and a drive motor 41, so that the membrane filter device 21 moves horizontally back and forth in the reaction tank. The inertia generated by this reciprocating motion helps control membrane fouling and reduce the accumulation of sludge on the membrane surface of the membrane filter device 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 feeding is stopped, and the backwashing chemical cleaning liquid is injected through the backwashing 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, and the inertia of the shaking of the membrane filaments is used 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 methanogenic reaction tank 12 is 10.4 g COD / L / d, and the influent concentration is 120.7 g COD / L.

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

[0224] After the kitchen waste slurry is fermented in the anaerobic hydrolysis 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 volume 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. In 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 pollution.

[0228] The membrane filtering 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 5.0L of biogas per day, and the methane conversion rate is 0.27L of methane per 1g of COD, which is close to the theoretical maximum value of 0.35L ( Fig. 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An anaerobic biological reaction system, used for treating organic solid waste and wastewater, characterized in that: include: Reaction tank body, filtration components and biogas circulation components; The reaction tank body comprises 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; 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 acidification reaction tank and the anaerobic methanogenesis reaction tank, and is used to collect the biogas generated in the anaerobic hydrolysis acidification reaction tank and the anaerobic methanogenesis reaction tank, and return the biogas to the anaerobic hydrolysis acidification reaction tank and the anaerobic methanogenesis reaction tank.

2. The anaerobic bioreactor system according to claim 1, characterized in that: A partition is provided between the anaerobic hydrolysis acidification reaction tank and the anaerobic methanogenesis reaction tank; The partition is provided with an overflow hole; The material in the oxygen hydrolysis acidification reaction tank can overflow into the anaerobic methanogenesis reaction tank through the overflow hole; Preferably, the anaerobic hydrolysis acidification reaction tank is provided with a feed pipeline; Preferably, the anaerobic methanogenesis reaction tank is provided with a sludge discharge pipeline; Preferably, the partition is provided with a plurality of overflow holes in a vertical direction perpendicular to the overflow direction of the material from the oxygen hydrolysis acidification reaction tank toward the anaerobic methanogenesis reaction tank; Preferably, the overflow hole comprises an orifice, and a controllable switch hole cover arranged on the orifice and capable of closing the orifice.

3. The anaerobic bioreactor system according to claim 1, characterized in that: 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 water outlet pipeline 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; Preferably, the filter assembly further comprises a filter control device electrically connected to the filter pump; Preferably, the filter assembly further comprises a pressure monitoring device provided on the water outlet pipeline; Preferably, the membrane filtration device comprises a filtration body, and a plurality of hollow fiber membrane units disposed in the filtration body; Preferably, the filter material in the hollow fiber membrane unit is made of PVDF and / or PTFE.

4. The anaerobic bioreactor system according to claim 3, characterized in that: The filter assembly also includes a backwashing device; The backwashing device comprises a backwashing pipeline and a backwashing pump connected to the backwashing 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 water outlet pipeline.

5. The anaerobic bioreactor system according to claim 1, characterized in that: 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 acidification reaction tank and the anaerobic methanogenesis reaction tank, and is used to receive the biogas generated in the anaerobic hydrolysis acidification reaction tank and the anaerobic methanogenesis reaction tank; The gas circulation pump is arranged on the gas collection pipeline; 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; Preferably, the biogas circulation component further comprises a gas one-way valve arranged on the gas collection pipeline; Preferably, the biogas circulation component further comprises a gas flow valve arranged on the gas collection pipeline; Preferably, a biogas collecting pipeline is also provided at the upper end of the anaerobic methanogenesis reaction tank.

6. The anaerobic bioreactor system according to claim 5, characterized in that: 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 methanogenic reaction tank; The second collecting pipe is connected to the top of the anaerobic hydrolysis acidification reaction tank.

7. The anaerobic bioreactor system according to claim 4, characterized in that: The anaerobic bioreactor system also 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; Preferably, the reciprocating drive assembly comprises a drive motor, a slider, a sliding platform and a movement control device; The movement control device is electrically connected to the driving motor; the slider is connected to the membrane filtration device; The slider is arranged on the sliding platform, and can drive the membrane filtering device to move along the length direction of the sliding platform through the drive motor based on the control of the movement control device.

8. A method for treating organic solid waste and wastewater, based on the anaerobic biological reaction system according to any one of claims 1 to 7, 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 acidification reaction tank into the anaerobic methanogenesis reaction tank 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 is subjected to membrane separation treatment by a filtering component, and the filtrate generated by the membrane separation treatment is discharged from the anaerobic methanogenesis reaction tank; The biogas generated in the anaerobic hydrolysis acidification reaction tank and the anaerobic methanogenesis reaction tank are respectively collected by a biogas circulation component, and the biogas is fed back to the anaerobic hydrolysis acidification reaction tank and the anaerobic methanogenesis reaction tank to be mixed with the mud-water mixture.

9. The method for treating organic solid waste and wastewater according to claim 8, characterized in that: The method for treating organic solid waste and wastewater also includes: 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, so as to perform the membrane separation treatment on the mud-water mixture; Preferably, the time ratio of the membrane filtration state and the membrane relaxation state is numerically no higher than 1 / 3.

10. The method for treating organic solid waste and wastewater according to claim 9, characterized in that: 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 a preset shutdown threshold, the shutdown maintenance process is entered; Preferably, the preset shutdown threshold is 30 kPa; Preferably, the shutdown maintenance process includes: Stop feeding, and inject the backwashing chemical cleaning liquid from the backwashing pipeline into the membrane filtration device through the backwashing pump in the backwashing device, so that the backwashing 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 reciprocate along the length direction of the sliding platform, so that the membrane filaments in the filter material of the membrane filtration device can 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 trans-membrane pressure difference through the pressure monitoring device.

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