Organic solid waste treatment device and method based on microbial electron transfer enhancement

Abstract

The invention belongs to the technical field of organic solid anaerobic digestion, and provides an organic solid waste treatment device and method based on microbial electron transfer intensification. A central electrode and an inner wall electrode are arranged in a cylindrical anaerobic digestion reaction tank, and electron transfer in a system is driven by a voltage-stabilized direct-current power supply; the stirring paddles are arranged on the two sides to strengthen the rheological property and electron transfer capacity of the organic solid waste, and a dispersive conductive material adding system is arranged, so that the resistivity of materials in the tank is further reduced, and an efficient anaerobic digestion electron transfer way is constructed. The bottleneck problems that in the anaerobic digestion process, electron transfer driving force of biological metabolism reaction is insufficient, and transfer ways are lacked are solved, the methane conversion rate of organic solid waste is increased, the methane concentration ratio in biogas is increased, and the method has good application prospects.

Description

Technical Field

[0001] The invention belongs to the technical field of anaerobic digestion of organic solids, and specifically relates to an organic solid waste treatment device and method based on enhanced microbial electron transfer. Background Art

[0002] Organic solid waste, namely biomass waste (such as animal excrement, kitchen waste, municipal sludge, etc.), has the characteristics of huge output, rich carbon sources and complex components. If such materials are not handled properly, it is very easy to cause pollution spread and cause ecological imbalance; at the same time, it may become a breeding ground for pathogens and endanger public health safety. Anaerobic bioconversion is an environmentally friendly treatment technology for biomass waste. It converts organic matter into recyclable methane through anaerobic bacteria, which has the dual benefits of volume reduction and energy recovery. In engineering practice, although the continuous stirred tank reactor (CSTR) has long been used as a mainstream treatment device, its organic load is only maintained below 10 kg / m³·d, and it is very easy to produce acidification collapse.

[0003] From the perspective of biochemical mechanism, the anaerobic bioconversion process involves four cascade reaction stages: hydrolysis, acidification, acetogenesis, and methanogenesis. Its essence is a redox reaction driven by microorganisms. In the process of multi-microbial synergistic conversion reactions, the strength of the electron transfer rate plays a decisive role. In recent years, cutting-edge research in the field of anaerobic biotechnology has shown that applying a weak electric field in the anaerobic digestion system can enhance the electron transfer rate between bacteria, increase the activity of cellulase and amylase, and simultaneously weaken the dense structure of organic solid waste materials; introducing a conductive medium can reconstruct the electron transfer network, strengthen direct electron exchange between species, and thereby enhance the metabolic rate of anaerobic digestion substrates.

[0004] However, the above anaerobic digestion efficiency enhancement technology still has many defects in the application process, such as the excessively high resistivity of organic solid waste resulting in a decrease in the effect of microvoltage, and the insufficient driving force for electron transfer between bacteria resulting in a weak effect of conductive materials. In view of this, there is an urgent need to develop new engineering anaerobic digestion equipment and efficiently integrate and apply cutting-edge anaerobic digestion efficiency enhancement technology. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides an organic solid waste treatment device and method based on microbial electron transfer enhancement to solve the problems in the prior art. The technical solution adopted by the present invention is: An organic solid waste treatment device based on microbial electron transfer enhancement includes an anaerobic digestion tank main tank body, a central electrode, an inner wall electrode, a voltage-stabilized DC power supply and a dispersed conductive material dosing system; A central electrode and an inner wall electrode are arranged in the main tank body of the anaerobic digestion tank, the inner wall electrode is arranged around the inner wall surface of the main tank body of the anaerobic digestion tank, the central electrode is located at the center of the main tank body of the anaerobic digestion tank and is spaced apart from the inner wall electrode; The central electrode and the inner wall electrode are connected to the positive and negative electrodes of the voltage-stabilized DC power supply respectively; the central electrode and the inner wall electrode are used to form an electric field in the organic solid waste; The dispersed conductive material adding system is connected to the main tank body of the anaerobic digestion tank and is used to add dispersed conductive materials into the main tank body of the anaerobic digestion tank to reduce the resistivity of organic solid waste and provide a pathway for direct interspecies electron transfer of anaerobic microorganisms; The dispersed conductive material dosing system comprises a dispersed conductive material storage tank, a screw pump and a conductive material feed pipeline; The dispersed conductive material storage tank is provided with dispersed conductive material, the dispersed conductive material storage tank is connected to the input end of the screw pump, the output end of the screw pump is connected to the conductive material feed pipeline, and the conductive material feed pipeline is connected to the main tank body of the anaerobic digestion tank; The conductive material feed pipeline includes a main pipe and a plurality of manifolds, the plurality of manifolds are respectively connected to different upper and lower positions of the main tank body of the anaerobic digestion tank, and the plurality of manifolds are respectively provided with solenoid valves.

[0006] Furthermore, the dispersed conductive material includes one or more of activated carbon powder, carbon nanotubes, MOF-, and FeO powder.

[0007] Furthermore, it also includes a stirring paddle and a stirring motor; a plurality of the stirring motors are installed on the top of the main tank body of the anaerobic digester, and the output end of the stirring motor is connected to the stirring paddle, and the stirring paddle is located in the main tank body of the anaerobic digester.

[0008] Furthermore, it also includes a water bath constant temperature system, which includes a water bath constant temperature layer, a constant temperature liquid pipeline, a water heater and a magnetic pump; the water bath constant temperature layer is arranged in the pipe wall of the main tank body of the anaerobic digestion tank, and the water bath constant temperature layer is connected to the water heater and the magnetic pump through the constant temperature liquid pipeline to realize the function of water bath constant temperature.

[0009] Furthermore, a feed inlet is arranged at the top of the main tank body of the anaerobic digestion tank, a discharge port and an internal circulation pipeline are arranged at the bottom of the main tank body of the anaerobic digestion tank, and the internal circulation pipeline is connected to the feed inlet.

[0010] Furthermore, an ORP meter is provided on the main tank body of the anaerobic digestion tank for detecting oxidation-reduction potential.

[0011] A method for treating organic solid waste based on enhanced microbial electron transfer, applied to the above-mentioned device for treating organic solid waste based on enhanced microbial electron transfer, comprises the following steps: S0, the main tank of the anaerobic digestion tank is filled with anaerobic digestion sludge, and the dispersed conductive material storage tank is equipped with dispersed conductive material; S1, detect the pH, chemical oxygen demand COD, and NH3-N content of the organic solid waste to be treated, and inject it into the main tank of the anaerobic digestion tank from the feed inlet; S2, after the pH of the material in the main tank of the anaerobic digestion tank is stabilized at 6.5-8, the conductivity is stable, and the gas production is stable, the regulated DC power supply is started, and the output voltage is adjusted according to the material conductivity and the output current; S3, after waiting for the operation to stabilize again, pump dispersed conductive materials into the main tank of the anaerobic digester to reduce the conductivity of the material and provide a direct electron transfer channel between bacteria, thereby optimizing the redox reaction environment in the anaerobic digestion system; S4, during operation, the dispersed conductive material is added in a supplementary manner. When the material conductivity or the output current reaches the set lower limit, the dispersed conductive material is pumped into the main tank of the anaerobic digester again; S5, after stable operation, adjust the feed rate to control the hydraulic retention time in the main tank of the anaerobic digester according to the organic matter content of the input organic solid waste, the total gas production in the main tank of the anaerobic digester, and the methane concentration in the gas.

[0012] The present invention has the following beneficial effects: (1) The present invention uses a stabilized DC power supply to apply a micro voltage to the positive and negative electrodes of the reaction tank, providing a direct electron input and output port for the anaerobic digestion system, significantly improving the electron transfer efficiency of microorganisms, increasing the driving force of the redox reaction of biological metabolism, and thus accelerating the anaerobic digestion process of organic solid waste; (2) The present invention uses dispersible conductive materials to be uniformly added to the anaerobic digester in multiple layers, providing a pathway for direct interspecies electron transfer between microorganisms and reducing the resistivity of the material between the positive and negative electrodes; (3) The present invention couples micro-voltage technology with conductive material enhancement technology, thereby improving the efficiency and methane production capacity of anaerobic digestion and having good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is the overall structure diagram of the present invention; Figure 2 It is a schematic diagram of the experimental results of Example 1; Figure 3 is a schematic diagram of the experimental results of Example 2, In the figure: 1. base; 2. water bath constant temperature layer; 3. main tank body of anaerobic digester; 4. inner wall electrode; 5. electrode bracket; 6. temperature transmitter; 7. insulating base; 8. insulating sleeve; 9. center electrode; 10. stirring paddle; 11. sealing sleeve; 12. biogas outlet; 13. stirring motor; 14. regulated DC power supply; 15. wire; 16. feed port; 17. conductive material feed pipeline; 18. solenoid valve; 19. dispersed conductive material storage tank; 20. screw pump; 21. magnetic pump; 22. water heater; 23. constant temperature liquid pipeline; 24. internal circulation pipeline; 25. discharge port; 26. ORP meter. DETAILED DESCRIPTION

[0014] The following will be combined with the embodiments of the present invention Figure 1-Figure 3 , the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0015] The present invention provides an organic solid waste treatment device and method based on enhanced microbial electron transfer, wherein a central electrode 9 and an inner wall electrode 4 are arranged in a cylindrical anaerobic digestion reaction tank, and the electron transfer in the system is driven by a voltage-stabilized DC power supply 14. The rheological properties and electron transfer capacity of the organic solid waste are enhanced by arranging stirring paddles 10 on both sides, and a dispersed conductive material addition system is provided to further reduce the resistivity of the material in the tank, thereby constructing an efficient anaerobic digestion electron transfer pathway. The present invention solves the bottleneck problems of insufficient driving force for electron transfer in biological metabolic reactions and missing transfer pathways in the anaerobic digestion process, improves the methane conversion rate of organic solid waste, and increases the proportion of methane concentration in biogas, and has good application prospects.

[0016] like Figure 1 , an organic solid waste treatment device based on microbial electron transfer enhancement, comprising an anaerobic digestion tank main tank body 3, a central electrode 9, an inner wall electrode 4, a voltage-stabilized DC power supply 14 and a dispersed conductive material dosing system; A central electrode 9 and an inner wall electrode 4 are arranged in the main tank body 3 of the anaerobic digestion tank. The inner wall electrode 4 is arranged around the inner wall surface of the main tank body 3 of the anaerobic digestion tank. The central electrode 9 is located at the center of the main tank body 3 of the anaerobic digestion tank and is spaced apart from the inner wall electrode 4. The central electrode 9 and the inner wall electrode 4 are connected to the positive and negative electrodes of the stabilized DC power supply 14 respectively; the central electrode 9 and the inner wall electrode 4 are used to form an electric field in the organic solid waste; The dispersed conductive material adding system is connected to the main tank body 3 of the anaerobic digestion tank, and is used to add dispersed conductive materials into the main tank body 3 of the anaerobic digestion tank to reduce the resistivity of organic solid waste and provide a pathway for direct interspecies electron transfer of anaerobic microorganisms.

[0017] Specifically, the main tank body 3 of the anaerobic digestion tank is an insulating tank body, the bottom of which is supported by a base 1, and the organic solid waste is pumped into the feed port 16 at the top of the main tank body 3 of the anaerobic digestion tank. The central electrode 9 is connected to the positive electrode of the regulated DC power supply 14 through a wire 15, and the inner wall electrode 4 is connected to the negative electrode of the regulated DC power supply 14 through another wire 15; the central electrode 9 is made of a rigid solid conductor material, including one of a graphite rod, a platinum carbon rod, an iron rod, and a copper rod, and is arranged at the center of the main tank body 3 of the anaerobic digestion tank; the inner wall electrode 4 is made of a non-rigid conductor material, including one of a carbon fiber felt and a carbon cloth, and is arranged on the inner wall of the cylindrical tank body of the tank body. The inner wall electrode 4 is fixedly arranged by an electrode bracket 5 on the inner wall of the main tank body 3 of the anaerobic digestion tank.

[0018] The function of the central electrode 9 and the inner wall electrode 4 is to construct an electric field environment, which can promote the electron transfer process of microorganisms in organic solid waste, provide direct electron input and output ports for the anaerobic digestion system, significantly improve the electron transfer efficiency of microorganisms, increase the driving force of the redox reaction of biological metabolism, and thus accelerate the anaerobic digestion process of organic solid waste.

[0019] In addition, a biogas outlet 12 is also provided on the top of the main tank body 3 of the anaerobic digestion tank. The main tank body 3 of the anaerobic digestion tank adopts a hemispherical top, a cylindrical tank body, and a conical tank bottom structure, and the cone angle of the conical tank bottom is 120°.

[0020] Furthermore, the dispersed conductive material dosing system includes a dispersed conductive material storage tank 19, a screw pump 20 and a conductive material feed pipeline 17; The dispersed conductive material storage tank 19 is provided with dispersed conductive material, and the dispersed conductive material storage tank 19 is connected to the input end of the screw pump 20 , and the output end of the screw pump 20 is connected to the conductive material feed pipeline 17 , and the conductive material feed pipeline 17 is connected to the main tank body 3 of the anaerobic digestion tank.

[0021] Furthermore, the conductive material feed pipeline 17 includes a main pipe and a plurality of manifolds, the plurality of manifolds are respectively connected to different upper and lower positions of the main tank body 3 of the anaerobic digestion tank, and the plurality of manifolds are respectively provided with solenoid valves 18 .

[0022] After the dispersed conductive material is stirred and mixed, it is pushed into the main tank body 3 of the anaerobic digester through the screw pump 20. The conductive material inlet is divided into three layers and arranged at 1 / 12, 5 / 12, and 9 / 12 of the main tank body 3 of the anaerobic digester from top to bottom.

[0023] Furthermore, the dispersed conductive material includes activated carbon powder, carbon nanotubes, MOF-808, Fe 2 O 3 One or more of powders.

[0024] Furthermore, it also includes a stirring paddle 10 and a stirring motor 13; a plurality of the stirring motors 13 are installed on the top of the main tank body 3 of the anaerobic digestion tank, and the output end of the stirring motor 13 is connected to the stirring paddle 10, and the stirring paddle 10 is located in the main tank body 3 of the anaerobic digestion tank.

[0025] A sealing sleeve 11 is fixed on the top of the main tank body 3 of the anaerobic digestion tank, and the shaft of the stirring paddle 10 passes through the sealing sleeve 11. The stirring paddle 10 is symmetrically arranged on both sides of the tank, located between the central electrode 9 and the inner wall electrode 4, and the paddles of the stirring paddle 10 are divided into three and arranged at 1 / 6, 1 / 2, and 5 / 6 of the cylindrical tank body from top to bottom.

[0026] Furthermore, it also includes a water bath constant temperature system, which includes a water bath constant temperature layer 2, a constant temperature liquid pipeline 23, a water heater 22 and a magnetic pump 21; the water bath constant temperature layer 2 is arranged in the pipe wall of the main tank body 3 of the anaerobic digestion tank, and the water bath constant temperature layer 2 is connected to the water heater 22 and the magnetic pump 21 through the constant temperature liquid pipeline 23 to realize the function of water bath constant temperature.

[0027] The main tank body 3 of the anaerobic digestion tank is provided with a temperature transmitter 6 to detect the temperature, an ORP meter 26 to detect the redox potential, and a constant temperature liquid pipeline 23 as a circulation pipeline. The temperature is detected by the temperature transmitter 6, and the water heater 22 heats the liquid medium, so that the medium of the water bath constant temperature layer 2 is kept at a constant temperature, so that the present invention provides a constant temperature reaction environment. The redox potential is detected by the ORP meter 26, and the ORP value is further reduced by using a dispersed conductive material, thereby optimizing the biological redox reaction environment in the system.

[0028] Furthermore, a feed port 16 is provided at the top of the main tank body 3 of the anaerobic digestion tank, and a discharge port 25 and an internal circulation pipeline 24 are provided at the bottom of the main tank body 3 of the anaerobic digestion tank, and the internal circulation pipeline 24 is connected to the feed port 16. The discharge port 25 is used to discharge excess materials and biogas residues, and the internal circulation pipeline 24 is connected to the feed port 16 through a pump body, so that the materials in the main tank body 3 of the anaerobic digestion tank circulate during the reaction process, promote material homogenization, and prevent the accumulation of top foam.

[0029] The workflow of the present invention is as follows: (I) The organic solid waste is stirred and mixed to adjust to a suitable solid content and C / N ratio, pumped into the anaerobic digestion main tank through the feed port 16, and the biogas residue is discharged through the discharge port 25, while continuously circulating in the internal circulation pipeline 24 at the bottom of the anaerobic digestion tank main tank 3; (II) applying a micro voltage to the central electrode 9 and the inner wall electrode 4 through a stabilized DC power supply 14 to form a stable electric field; (III) controlling the temperature of the main tank body 3 of the anaerobic digestion tank based on the temperature transmitter 6 and the water bath constant temperature system; (IV) Dispersed conductive material is added to the main tank body 3 of the anaerobic digester, and additional dispersed conductive material is added based on the redox potential detected by the ORP meter 26.

[0030] Preferably, in process (I), the solid content of organic solid waste is 2%-10%, the C / N ratio is 15%-25%, semi-continuous feeding is adopted, the hydraulic retention time is 20d-30d, and the internal circulation flow rate is 2×reactor working volume / d.

[0031] Preferably, in process (II), the output voltage of the regulated DC power supply 14 is based on the actual output voltage of the electrode, and the control voltage is 0.6V-1V.

[0032] Preferably, in process (III), the temperature is controlled in the range of 35-39°C or 50-55°C.

[0033] Preferably, the dosage of dispersed conductive material is 1%-10% of the dry weight of sludge, optimizing the ORP in the system to below -350mV.

[0034] The present invention also provides an organic solid waste treatment method based on microbial electron transfer enhancement, which is applied to the organic solid waste treatment device based on microbial electron transfer enhancement, and comprises the following steps: S0, the main tank 3 of the anaerobic digestion tank is filled with anaerobic digestion sludge, the dispersed conductive material storage tank 19 is equipped with dispersed conductive material, the water bath thermostat system controls the reactor temperature to 35-39°C, the internal circulation flow rate is controlled to 2 times the effective volume of the tank / d, and the stirring motor is turned on to control the stirring paddle speed to 50 r / min; S1, detect pH, chemical oxygen demand COD, NH 3 -N content, is injected into the main tank body 3 of the anaerobic digester through the feed port 16 according to the operating conditions. When feeding, the solenoid valve of the internal circulation pipeline 24 is closed, and the solenoid valve of the discharge port 25 is opened to control the equal amount of feed and discharge; S2, after the pH of the material in the main tank body 3 of the anaerobic digestion tank is stabilized at 6.5-8, the conductivity is stable, and the gas production is stable, the regulated DC power supply 14 is started, and the output voltage of the regulated DC power supply 14 is adjusted to make the electrode output voltage 0.6V-1V.

[0035] S3, after the whole system runs stably again, dispersed conductive material is pumped into the main tank body 3 of the anaerobic digester according to the operating conditions to reduce the conductivity of the material and provide a direct electron transfer channel between bacteria, thereby optimizing the redox reaction environment in the anaerobic digestion system and controlling the ORP value below -350mV.

[0036] S4, during operation, the dispersed conductive material is added in a supplementary manner. When the material conductivity or the output current reaches the set lower limit, the dispersed conductive material is pumped into the main tank body 3 of the anaerobic digester again; S5, after stable operation, the feed rate is adjusted to control the hydraulic retention time in the main tank body 3 of the anaerobic digester according to the organic matter content of the input organic solid waste, the total gas production in the main tank body 3 of the anaerobic digester, and the methane concentration in the gas.

[0037] The present invention also provides the following two specific embodiments to illustrate the progress of the present invention:

[0038] Embodiment 1: This example aims to implement the present invention in a semi-continuous flow anaerobic digestion experiment using perishable organic substrates as a matrix.

[0039] A semi-continuous methane abortion experiment was conducted in a reactor with a working volume of 5.7 L using a perishable organic substrate (VS = 2%, consisting of a matrix consisting of LB-broth 8 g / L, beef extract 5 g / L, starch 4 g / L, vegetable oil 2 g / L, and humic acid 1 g / L) as inoculum; the results are shown in Table 1. Figure 2 As shown, test group 1 is the experimental group of the present invention, and the control group uses a fully mixed anaerobic digester as the control group. In this embodiment, the organic resource conversion rate of the device of the present invention is always higher than that of the control group. Compared with the control group, the net cumulative methane production of the organic matter of the substrate in the embodiment is increased by an average of 62.7%.

[0040] Embodiment 2: This embodiment aims to implement the present invention in a semi-continuous flow anaerobic digestion experiment using excess sludge from a secondary sedimentation tank as a substrate.

[0041] The residual sludge from the secondary sedimentation tank (VS = 3.4%-5.2%, TS = 4.0%-6.0%) was used as the substrate to conduct a semi-continuous methane abortion experiment in a reactor with a working volume of 5.7 L. The results are shown in Figure 2. Figure 3 As shown, test group 2 is the experimental group of the present invention, and the control group uses a fully mixed anaerobic digester as the control group. In this embodiment, the organic load of the reactor is gradually increased, and the gas production efficiency of the substrate fluctuates greatly, but the organic resource conversion rate of the device of the present invention is always higher than that of the control group. Compared with the control group, the net cumulative methane production of the organic matter of the substrate in the embodiment is increased by an average of 70.9%.

[0042] The embodiments described above are only descriptions of the preferred modes of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations, modifications, and substitutions made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. An organic solid waste treatment device based on microbial electron transfer enhancement, characterized in that: It comprises an anaerobic digestion tank main body (3), a central electrode (9), an inner wall electrode (4), a voltage-stabilized DC power supply (14) and a dispersed conductive material dosing system; A central electrode (9) and an inner wall electrode (4) are arranged in the main tank body (3) of the anaerobic digestion tank. The inner wall electrode (4) is arranged around the inner wall surface of the main tank body (3) of the anaerobic digestion tank. The central electrode (9) is located at the center of the main tank body (3) of the anaerobic digestion tank and is spaced apart from the inner wall electrode (4). The central electrode (9) and the inner wall electrode (4) are respectively connected to the positive and negative electrodes of the voltage-stabilized DC power supply (14); the central electrode (9) and the inner wall electrode (4) are used to form an electric field in the organic solid waste; The dispersed conductive material adding system is connected to the main tank body (3) of the anaerobic digestion tank and is used to add dispersed conductive material into the main tank body (3) of the anaerobic digestion tank to reduce the resistivity of organic solid waste and provide a pathway for direct interspecies electron transfer of anaerobic microorganisms; The dispersed conductive material dosing system comprises a dispersed conductive material storage tank (19), a screw pump (20) and a conductive material feed pipeline (17); The dispersed conductive material storage tank (19) is provided with dispersed conductive material, the dispersed conductive material storage tank (19) is connected to the input end of the screw pump (20), the output end of the screw pump (20) is connected to the conductive material feed pipeline (17), and the conductive material feed pipeline (17) is connected to the main tank body (3) of the anaerobic digestion tank; The conductive material feed pipeline (17) comprises a main pipe and a plurality of manifolds, the plurality of manifolds are respectively connected to different upper and lower positions of the main tank body (3) of the anaerobic digestion tank, and the plurality of manifolds are respectively provided with solenoid valves (18).

2. The organic solid waste treatment device based on microbial electron transfer enhancement according to claim 1, characterized in that: The dispersed conductive material includes one or more of activated carbon powder, carbon nanotubes, MOF-808, and Fe2O3 powder.

3. The organic solid waste treatment device based on microbial electron transfer enhancement according to claim 1, characterized in that: It also comprises a stirring paddle (10) and a stirring motor (13); a plurality of the stirring motors (13) are installed on the top of the main tank body (3) of the anaerobic digestion tank, the output end of the stirring motor (13) is connected to the stirring paddle (10), and the stirring paddle (10) is located inside the main tank body (3) of the anaerobic digestion tank.

4. The organic solid waste treatment device based on microbial electron transfer enhancement according to claim 1, characterized in that: It also comprises a water bath constant temperature system, the water bath constant temperature system comprising a water bath constant temperature layer (2), a constant temperature liquid pipeline (23), a water heater (22) and a magnetic pump (21); the water bath constant temperature layer (2) is arranged in the pipe wall of the main tank body (3) of the anaerobic digestion tank, and the water bath constant temperature layer (2) is connected to the water heater (22) and the magnetic pump (21) through the constant temperature liquid pipeline (23) to achieve the function of water bath constant temperature.

5. The organic solid waste treatment device based on microbial electron transfer enhancement according to claim 1, characterized in that: A feed inlet (16) is arranged at the top of the main tank body (3) of the anaerobic digestion tank, and a discharge port (25) and an internal circulation pipeline (24) are arranged at the bottom of the main tank body (3) of the anaerobic digestion tank, wherein the internal circulation pipeline (24) is connected to the feed inlet (16).

6. The organic solid waste treatment device based on microbial electron transfer enhancement according to claim 1, characterized in that: The main tank body (3) of the anaerobic digestion tank is provided with an ORP meter (26) for detecting the redox potential.

7. A method for treating organic solid waste based on enhanced microbial electron transfer, applied to an organic solid waste treatment device based on enhanced microbial electron transfer as claimed in any one of claims 1 to 6, characterized in that: The following steps are involved: S0, the anaerobic digestion tank main tank body (3) is filled with anaerobic digestion sludge, and the dispersed conductive material storage tank (19) is provided with dispersed conductive material; S1, detecting the pH, chemical oxygen demand (COD), and NH3-N content of the organic solid waste to be treated, and injecting the waste into the main tank body (3) of the anaerobic digestion tank from the feed inlet (16); S2, after the pH of the material in the main tank body (3) of the anaerobic digestion tank is stabilized at 6.5-8, the conductivity is stable, and the gas production is stable, the regulated DC power supply (14) is started, and the output voltage is adjusted according to the conductivity of the material and the output current; S3, after waiting for the operation to stabilize again, pumping dispersed conductive material into the main tank body (3) of the anaerobic digestion tank to reduce the conductivity of the material and provide a direct electron transfer channel between bacteria, thereby optimizing the redox reaction environment in the anaerobic digestion system; S4, during operation, the dispersed conductive material is added in a supplementary manner. When the material conductivity or the output current reaches a set lower limit, the dispersed conductive material is pumped into the main tank body (3) of the anaerobic digester again; S5, after stable operation, the feed rate is adjusted to control the hydraulic retention time in the main tank (3) of the anaerobic digester according to the organic matter content of the input organic solid waste, the total gas production in the main tank (3) of the anaerobic digester, and the methane concentration in the gas.

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