An integrated system device and method for efficient anaerobic digestion of organic solid waste

Abstract

The present invention relates to the technical field of anaerobic digestion of organic waste, and discloses an integrated system device and method for efficient anaerobic digestion of organic solid waste. The present invention applies a micro voltage to the anaerobic digestion reaction system through a stabilized DC power supply, promotes anaerobic digestion of organic solid waste, and enriches electroactive anaerobic bacteria on the surface of graphite rod electrodes and carbon fiber felt electrodes: by arranging iron-carbon materials in multiple layers in the reaction tank body, the interspecies electron transfer process of microorganisms in the anaerobic digestion reaction system is optimized, and electroactive anaerobic bacteria are enriched on the surface of the iron-carbon materials; by adding limited oxygen (micro-aeration), it can be used as an electron donor / acceptor to regulate the redox reaction and metabolic pathway of microorganisms and promote anaerobic bioconversion; at the same time, the reactor is connected to the anaerobic digestion reactor externally and circulated to gradually optimize the anaerobic digestion microbial flora structure of the entire reaction system, and finally improve the anaerobic resource conversion efficiency of organic solid waste.

Description

Technical Field

[0001] The invention relates to the technical field of anaerobic digestion of organic waste, and in particular to an integrated system device and method for efficient anaerobic digestion of organic solid waste. Background Art

[0002] Organic solid waste (livestock and poultry manure, kitchen waste, residual sludge, etc.) has the characteristics of large emission, high organic component content, and complex and diverse material composition. If a large amount of organic solid waste is not handled properly, it will lead to organic matter corruption, damage the ecological environment, and breed pathogenic microorganisms, threatening human health.

[0003] Anaerobic digestion converts organic matter into the energy substance methane through anaerobic microorganisms, which can achieve the reduction of organic solid waste and resource transformation. It is an environmentally friendly and perishable organic solid waste treatment technology.

[0004] In engineering applications, fully mixed continuous stirred tank reactors have long been used as the main reaction carrier for anaerobic digestion, but their anaerobic resource conversion efficiency has always been low. So far, the highest organic load reported for fully mixed continuous stirred tank reactors is 10kg / m 3 ·d, compared with the organic load of the rumen of the naturally existing “reactor” ruminant (100 kg / m 3 d) There are still huge gaps.

[0005] From the perspective of reaction mechanism, anaerobic digestion is a complex chain reaction, including four stages: hydrolysis, acidification, hydrogen and acetic acid production, and methanogenesis. Moreover, the anaerobic digestion system is a complex reaction system in which multiple bacterial species collaborate and each bacterial community coexists. Therefore, the structure and activity of the anaerobic microbial community play a decisive role in the efficiency of anaerobic digestion of organic solid waste. The latest research in the field of anaerobic digestion has found that (1) applying microvoltage to the digestion system can loosen the structure of solid waste and significantly increase the activity of proteases and α-glucosidases; (2) adding conductive materials can adjust the electron flow of biological metabolic reactions and promote direct interspecies electron transfer between microorganisms; (3) adding limited oxygen (micro-aeration) can act as an electron donor / acceptor to regulate the redox reactions and metabolic pathways of microorganisms and promote anaerobic biotransformation. However, there has been no engineering application of related research content, mainly because the technical problems of engineering application of related content have not been solved and there is a lack of engineering application scenarios.

[0006] Therefore, providing application scenarios for the above technologies and developing new anaerobic digestion systems and equipment that can be applied in engineering applications are of great practical significance for improving the anaerobic digestion efficiency and resource conversion rate of organic solid waste. Summary of the invention

[0007] The purpose of the present invention is to provide an integrated system device and method for efficient anaerobic digestion of organic solid waste based on the above technical problems.

[0008] The technical solution of the present invention:

[0009] The first aspect of the present invention provides an integrated system device for efficient anaerobic digestion of organic solid waste, the integrated system device comprising a fully mixed continuous stirred tank reactor A, a microbial microvoltage and micro-electrolysis reactor B, and a micro-aeration and inert solid waste separation reactor C;

[0010] The fully mixed continuous stirred tank reactor A comprises a first feed port 1, a first insulation layer 2, a heating rod 3, a biogas outlet 4, a stirring paddle 5, a first discharge port 6, and a sixth feed port 31;

[0011] The microbial microvoltage and microelectrolysis reactor B is composed of a hemispherical plate cover, a cylindrical insulating tank body, and two column feet;

[0012] The outside of the hemispherical plate cover is provided with a second discharge port 7, a pressure transmitter 8, a pH detection port 9, a voltage-stabilized DC power supply 10, a wire sealing outlet 11, a first ORP detection port 12, and a hanging ring 13, and the hemispherical plate cover is sealed and connected to the cylindrical insulating tank body through a flange;

[0013] The cylindrical insulating tank is provided with a second insulation layer 14, an insulator 15, a carbon fiber felt 16, and a built-in bracket 17 in sequence from the outside to the inside, and the carbon fiber felt 16 is connected to the stabilized DC power supply 10 through an insulating sheathed wire;

[0014] The interior of the cylindrical insulating tank body is provided with a feed upflow zone I, an iron-carbon material slot group, a micro-voltage reaction zone group, and a pressurized discharge zone IV in sequence from bottom to top, and a graphite rod 18 is provided in the center of the interior of the cylindrical insulating tank body; an emptying pipe 19 is provided in the feed upflow zone I; the iron-carbon material slot group includes 6 identical cylindrical mesh frames II for storing iron-carbon materials, and the 6 cylindrical mesh frames II divide the cylindrical insulating tank body into seven equal parts, each of the cylindrical mesh frames II is fixed on the cylindrical insulating tank body by the built-in bracket 17, and each of the cylindrical mesh frames II is clamped to the graphite rod 18 by an insulating sleeve; the micro-voltage reaction zone group includes 6 identical micro-voltage reaction zones III; a grid 20 for separating the micro-voltage reaction zone III is provided in the pressurized discharge zone IV, and in the pressurized discharge zone IV, the graphite rod 18 is connected to the stabilized DC power supply 10 through an insulating sheathed wire;

[0015] The outside of the cylindrical insulating tank body is provided with a second feed port 21, an inspection port group, and a temperature transmitter 22; the second feed port 21 is provided at the bottom of the cylindrical insulating tank body, and the bottom tangent of the second feed port 21 is on the extension line of the top tangent of the drain pipe 19; the inspection port group includes 6 inspection ports V, and each of the inspection ports V is provided outside each of the microvoltage reaction zones III, and the bottom tangent of each of the inspection ports V is on the extension line of the top tangent of the corresponding cylindrical mesh frame II;

[0016] The micro-aeration and inert solid waste separation reactor C includes a third feed port 23, a fourth feed port 24, a fifth feed port 25, an air pump pipeline inlet 26, a third discharge port 27, a second ORP detection port 28, a third insulation layer 29, and a total discharge port 30;

[0017] Among them, the first discharge port 6 of the fully mixed continuous stirred tank reactor A is connected to the second feed port 21 of the microbial microvoltage and micro-electrolysis reactor B through a pipeline; the discharge port 7 of the microbial microvoltage and micro-electrolysis reactor B is connected to the third feed port 23, the fourth feed port 24, and the fifth feed port 25 of the micro-aeration and inert solid waste separation reactor C through a pipeline; the discharge port 27 of the micro-aeration and inert solid waste separation reactor C is connected to the sixth feed port 31 of the fully mixed continuous stirred tank reactor A through a pipeline.

[0018] Preferably, the integrated system device also includes a first screw pump (32) and a second screw pump (33), wherein the first screw pump (32) is connected to the first feed port (1) of the fully mixed continuous stirred tank reactor A via a pipeline, and the second screw pump (33) is connected to the second feed port (21) of the microbial microvoltage and microelectrolysis reactor B and the first discharge port (6) of the fully mixed continuous stirred tank reactor A via pipelines.

[0019] Further preferably, a backup flow pipeline is also provided in the integrated system device, and the backup flow pipeline connects the second screw pump (33) with the third feed port (23), the fourth feed port (24), and the fifth feed port (25) of the micro-aeration and inert solid waste separation reactor C.

[0020] Preferably, in the microbial microvoltage and microelectrolysis reactor B, the height of each cylindrical mesh frame II is 1 / 2 of the height of the cylindrical insulating tank body.

[0021] Preferably, in the microbial microvoltage and microelectrolysis reactor B, the average diameter of the mesh of each cylindrical mesh frame II is 8 mm, and two layers of iron-carbon balls with an average diameter of 10 mm are laid in each cylindrical mesh frame II.

[0022] According to a preferred specific embodiment, in the microbial microvoltage and micro-electrolysis reactor B, the thickness of the carbon fiber felt 16 is 10 mm, and before being laid for use, the carbon fiber felt 16 is pretreated by acid washing to remove some functional groups on the surface; the acid washing pretreatment includes: soaking the carbon fiber felt 16 in tap water for 2 hours, taking it out, soaking it in 1 mol dilute hydrochloric acid for 6 hours, and then soaking it in 1 mol dilute nitric acid for 6 hours, soaking and rinsing it with tap water until the pH value of the soaking liquid is neutral, and drying it.

[0023] According to a particularly preferred embodiment, in the microbial microvoltage and microelectrolysis reactor B, each of the inspection ports V is cylindrical and has a height-to-diameter ratio of 1:10.

[0024] Further preferably, in the micro-aeration and inert solid waste separation reactor C, the third feed inlet (23) is arranged at the tank body of the micro-aeration and inert solid waste separation reactor C. The fourth feed port (24) is arranged at the tank body of the micro-aeration and inert solid waste separation reactor C. The fifth feed port (25) is arranged at the micro-aeration and inert solid waste separation reactor C tank body. Place.

[0025] Preferably, the micro-aeration and inert solid waste separation reactor C is connected to an air pump (34).

[0026] More preferably, in the microbial microvoltage and micro-electrolysis reactor B, the height-to-diameter ratio of the cylindrical insulating tank body is 5:1.

[0027] Further preferably, in the micro-aeration and inert solid waste separation reactor C, the height-to-diameter ratio of the cylindrical tank body is 5:1.

[0028] According to a preferred specific embodiment, the volume ratio of the fully mixed continuous stirred tank reactor A to the microbial microvoltage and micro-electrolysis reactor B is 25:1.

[0029] Preferably, the volume ratio of the fully mixed continuous stirred tank reactor A to the micro-aeration and inert solid waste separation reactor C is 25:1.

[0030] A second aspect of the present invention provides a method for efficient anaerobic digestion of organic solid waste, the method comprising:

[0031] (1) placing organic solid waste in a fully mixed continuous stirred tank reactor A for stirring treatment to obtain an intermediate I;

[0032] (2) placing the intermediate I in a microbial microvoltage and microelectrolysis reactor B for anaerobic digestion, enrichment and loading of efficient bacterial flora, to obtain intermediate II;

[0033] (3) placing the intermediate II in a micro-aeration and inert solid waste separation reactor C to enhance the activity of anaerobic bacteria to obtain an intermediate III;

[0034] (4) The intermediate III is returned to the fully mixed continuous stirred tank reactor A to achieve a closed loop system; and according to the hydraulic retention time, the intermediate III is quantitatively discharged through the micro-aeration and inert solid waste separation reactor C;

[0035] The integrated system device described in the first aspect of the present invention includes the fully mixed continuous stirred tank reactor A, the microbial microvoltage and micro-electrolysis reactor B, and the micro-aeration and inert solid waste separation reactor C.

[0036] Preferably, in step (2), the power supply voltage of the microbial microvoltage and the micro-electrolysis reactor B is adjusted to 0.6V.

[0037] Further preferably, in step (3), the value range of the second ORP detection port (28) of the micro-aeration and inert solid waste separation reactor C is -400 to -450 mV.

[0038] The technical effects obtained by the present invention are:

[0039] (1) The present invention applies a micro voltage to the anaerobic digestion system through a stabilized DC power supply, promotes anaerobic digestion of organic solid waste, and enriches electroactive anaerobic bacteria on the surface of graphite rod electrodes and carbon fiber felt electrodes; by arranging iron-carbon materials in multiple layers in the reaction tank, the electron transfer process between microorganisms in the anaerobic digestion reaction system is optimized, and electroactive anaerobic bacteria are enriched on the surface of the iron-carbon materials; by adding limited oxygen (micro-aeration), it can act as an electron donor / acceptor to regulate the redox reaction and metabolic pathway of microorganisms and promote anaerobic bioconversion; at the same time, the reactor is connected to the anaerobic digestion reactor and circulated to gradually optimize the anaerobic digestion microbial flora structure of the entire reaction system, thereby ultimately improving the anaerobic resource conversion efficiency of organic solid waste.

[0040] (2) In the present invention, in the process of efficient anaerobic digestion of organic solid waste in an integrated system device, three cutting-edge technologies of anaerobic biological treatment of organic solid waste, namely micro voltage, micro electrolysis and micro aeration, are highly integrated; and the traditional non-selective discharge method is optimized to discharge by cyclone separation in an external reactor. In the microbial micro voltage and micro electrolysis reaction tank, the present invention uses a graphite rod with high conductivity as the positive electrode of the power supply, and a carbon fiber felt with high specific surface area and good conductivity as the negative electrode of the power supply; micro voltage is used to enhance the digestion reaction, and electroactive microorganisms are loaded on the electrode surface. In the micro aeration and inert solid waste separation reaction tank, the present invention adopts a micro oxygen supply method to adjust the redox potential in the tank, and further activate the anaerobic digestion flora. Through the continuous external circulation method, the microbial flora structure and reaction activity in the fully mixed continuous stirred tank reactor are gradually optimized, thereby improving the system anaerobic digestion efficiency and organic solid waste resource conversion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a diagram of an integrated system device for efficient anaerobic digestion of organic solid waste provided by the present invention;

[0042] Figure 2 It is a structural diagram of the microbial microvoltage and micro-electrolysis reactor provided by the present invention.

[0043] Description of Reference Numerals

[0044] 1. First feed port 2. First insulation layer 3. Heating rod

[0045] 4. Biogas outlet 5. Stirring paddle 6. First discharge port

[0046] 7. Second discharge port 8. Pressure transmitter 9. pH detection port

[0047] 10. Stabilized DC power supply 11. Wire sealing outlet 12. First ORP detection port

[0048] 13. Lifting ring 14. Second insulation layer 15. Insulator

[0049] 16. Carbon fiber felt 17. Built-in bracket 18. Graphite rod

[0050] 19, drain pipe 20, grid 21, second feed port

[0051] 22. Temperature transmitter 23. Third feed port 24. Fourth feed port

[0052] 25. Fifth feed port 26. Air pump pipeline inlet 27. Third discharge port

[0053] 28. Second ORP detection port 29. Third insulation layer 30. Main discharge port

[0054] 31. Sixth feed port 32. First screw pump 33. Second screw pump

[0055] 34. Air Pump DETAILED DESCRIPTION

[0056] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0057] The present invention will be described in detail below by way of examples. In the following examples, unless otherwise specified, the raw materials are all commercially available.

[0058] In the following examples, unless otherwise specified, in the microbial microvoltage and microelectrolysis reactor B, iron-carbon balls with a total amount of 100 g / L and an average diameter of 10 mm are evenly placed into 6 cylindrical mesh frames II through 6 inspection ports V.

[0059] In the following examples, unless otherwise specified, in the micro-aeration and inert solid waste separation reactor C, the aeration volume and aeration duration are adjusted by the numerical feedback of the second ORP detection port 28 .

[0060] Example 1

[0061] This example is used to provide a method for efficient anaerobic digestion of organic solid waste. Figure 1 The method is carried out in the integrated system device shown (the device includes a fully mixed continuous stirred tank reactor A, a microbial microvoltage and micro-electrolysis reactor B, and a micro-aeration and inert solid waste separation reactor C), and the method includes the following steps:

[0062] (1) The organic solid waste is pushed to the first feed port 1 by the first screw pump 32 and enters the fully mixed continuous stirred tank reactor A, and is stirred at a temperature of 37° C. and a rotation speed of 30 rpm to obtain an intermediate I;

[0063] The fully mixed continuous stirred tank reactor A comprises a first feed port 1 , a first insulation layer 2 , a heating rod 3 , a biogas outlet 4 , a stirring paddle 5 , a first discharge port 6 , and a sixth feed port 31 .

[0064] (2) The intermediate I is pushed through the first discharge port 6 and the second screw pump 33 to the second feed port 21, and enters the microbial micro-voltage and micro-electrolysis reactor B for anaerobic digestion of efficient bacterial flora enrichment and loading to obtain the intermediate II; the voltage of the stabilized DC power supply 10 of the microbial micro-voltage and micro-electrolysis reactor B is adjusted to 0.6V;

[0065] The microbial microvoltage and microelectrolysis reactor B is composed of a hemispherical plate cover, a cylindrical insulating tank body, and two column feet;

[0066] The outside of the hemispherical plate cover is provided with a second discharge port 7, a pressure transmitter 8, a pH detection port 9, a voltage-stabilized DC power supply 10, a wire sealing outlet 11, a first ORP detection port 12, and a hanging ring 13, and the hemispherical plate cover is sealed and connected to the cylindrical insulating tank body through a flange;

[0067] The cylindrical insulating tank is provided with a second insulation layer 14, an insulator 15, a carbon fiber felt 16, and a built-in bracket 17 in sequence from the outside to the inside, and the carbon fiber felt 16 is connected to the stabilized DC power supply 10 through an insulating sheathed wire;

[0068] The interior of the cylindrical insulating tank body is provided with a feed upflow zone I, an iron-carbon material slot group, a micro-voltage reaction zone group, and a pressurized discharge zone IV in sequence from bottom to top, and a graphite rod 18 is provided in the center of the interior of the cylindrical insulating tank body; an emptying pipe 19 is provided in the feed upflow zone I; the iron-carbon material slot group includes 6 identical cylindrical mesh frames II for storing iron-carbon materials, and the 6 cylindrical mesh frames II divide the cylindrical insulating tank body into seven equal parts, each of the cylindrical mesh frames II is fixed on the cylindrical insulating tank body by the built-in bracket 17, and each of the cylindrical mesh frames II is clamped to the graphite rod 18 by an insulating sleeve; the micro-voltage reaction zone group includes 6 identical micro-voltage reaction zones III; a grid 20 for separating the micro-voltage reaction zone III is provided in the pressurized discharge zone IV, and in the pressurized discharge zone IV, the graphite rod 18 is connected to the stabilized DC power supply 10 through an insulating sheathed wire;

[0069] A second feed port 21, an inspection port group, and a temperature transmitter 22 are provided on the outside of the cylindrical insulating tank body; the second feed port 21 is arranged at the bottom of the cylindrical insulating tank body, and the bottom tangent of the second feed port 21 is on the extension line of the top tangent of the drain pipe 19; the inspection port group includes 6 inspection ports V, and each of the inspection ports V is arranged on the outside of each of the microvoltage reaction areas III, and the bottom tangent of each of the inspection ports V is on the extension line of the corresponding top tangent of the cylindrical mesh frame II.

[0070] (3) The intermediate II overflows from the second discharge port 7 to the third feed port 23 or the fourth feed port 24 or the fifth feed port 25 (selected according to the inorganic component content of the system feed and the inorganic component content of the discharge from the total discharge port 30), and enters the micro-aeration and inert solid waste separation reactor C for anaerobic bacteria activity enhancement to obtain the intermediate III; the value range of the second ORP detection port 28 of the micro-aeration and inert solid waste separation reactor C is -400 to -450 mV;

[0071] The micro-aeration and inert solid waste separation reactor C includes a third feed port 23, a fourth feed port 24, a fifth feed port 25, an air pump pipeline inlet 26, a third discharge port 27, a second ORP detection port 28, a third insulation layer 29, and a total discharge port 30.

[0072] (4) The intermediate III overflows from the third discharge port 27 to the sixth feed port 31 and returns to the fully mixed continuous stirred tank reactor A to achieve a closed loop system;

[0073] And according to the hydraulic retention time, the material is quantitatively discharged through the total discharge port 30 of the micro-aeration and inert solid waste separation reactor C.

[0074] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. An integrated system device for efficient anaerobic digestion of organic solid waste, characterized in that: The integrated system device includes a fully mixed continuous stirred tank reactor A, a microbial microvoltage and micro-electrolysis reactor B, and a micro-aeration and inert solid waste separation reactor C; The fully mixed continuous stirred tank reactor A comprises a first feed inlet (1), a first insulation layer (2), a heating rod (3), a biogas outlet (4), a stirring paddle (5), a first discharge port (6), and a sixth feed inlet (31); The microbial microvoltage and microelectrolysis reactor B is composed of a hemispherical plate cover, a cylindrical insulating tank body, and two column feet; The hemispherical plate cover is provided with a second discharge port (7), a pressure transmitter (8), a pH detection port (9), a voltage-stabilized DC power supply (10), a wire sealing outlet (11), a first ORP detection port (12), and a hanging ring (13) on the outside, and the hemispherical plate cover is sealed and connected to the cylindrical insulating tank body via a flange; The cylindrical insulating tank body is provided with a second thermal insulation layer (14), an insulator (15), a carbon fiber felt (16), and a built-in bracket (17) in sequence from the outside to the inside, and the carbon fiber felt (16) is connected to the voltage-stabilized DC power supply (10) via an insulating sheathed wire; The interior of the cylindrical insulating tank is provided with a feed upflow zone I, an iron-carbon material slot group, a micro-voltage reaction zone group, and a pressurized discharge zone IV in order from bottom to top, and a graphite rod (18) is provided at the center of the interior of the cylindrical insulating tank; an exhaust pipe (19) is provided in the feed upflow zone I; the iron-carbon material slot group includes 6 identical cylindrical mesh frames II for storing iron-carbon materials, and the 6 cylindrical mesh frames II divide the cylindrical insulating tank into seven equal parts, and each of the cylindrical mesh frames I I is fixed to the cylindrical insulating tank body through the built-in bracket (17), and each of the cylindrical mesh frames II is clamped to the graphite rod (18) through an insulating sleeve; the microvoltage reaction zone group includes 6 identical microvoltage reaction zones III; a grid (20) is provided in the pressurized discharge zone IV for separating from the microvoltage reaction zone III, and in the pressurized discharge zone IV, the graphite rod (18) is connected to the regulated DC power supply (10) through an insulating sheathed wire; The outside of the cylindrical insulating tank body is provided with a second feed port (21), an inspection port group, and a temperature transmitter (22); the second feed port (21) is arranged at the bottom of the cylindrical insulating tank body, and the bottom tangent line of the second feed port (21) is on the extension line of the top tangent line of the drain pipe (19); the inspection port group includes 6 inspection ports V, and each of the inspection ports V is arranged outside each of the microvoltage reaction zones III, and the bottom tangent line of each of the inspection ports V is on the extension line of the top tangent line of the corresponding cylindrical mesh frame II; The micro-aeration and inert solid waste separation reactor C comprises a third feed port (23), a fourth feed port (24), a fifth feed port (25), an air pump pipeline inlet (26), a third discharge port (27), a second ORP detection port (28), a third insulation layer (29), and a total discharge port (30); The first discharge port (6) of the fully mixed continuous stirred tank reactor A is connected to the second feed port (21) of the microbial microvoltage and micro-electrolysis reactor B through a pipeline; the second discharge port (7) of the microbial microvoltage and micro-electrolysis reactor B is connected to the third feed port (23), the fourth feed port (24), and the fifth feed port (25) of the micro-aeration and inert solid waste separation reactor C through pipelines; the third discharge port (27) of the micro-aeration and inert solid waste separation reactor C is connected to the sixth feed port (31) of the fully mixed continuous stirred tank reactor A through a pipeline.

2. The integrated system device according to claim 1, wherein: The integrated system device also includes a first screw pump (32) and a second screw pump (33), wherein the first screw pump (32) is connected to the first feed port (1) of the fully mixed continuous stirred tank reactor A via a pipeline, and the second screw pump (33) is connected to the second feed port (21) of the microbial microvoltage and microelectrolysis reactor B and the first discharge port (6) of the fully mixed continuous stirred tank reactor A via pipelines. And / or, a backup flow pipeline is further provided in the integrated system device, wherein the backup flow pipeline connects the second screw pump (33) with the third feed port (23), the fourth feed port (24), and the fifth feed port (25) of the micro-aeration and inert solid waste separation reactor C.

3. The integrated system device according to claim 1 or 2, wherein: In the microbial microvoltage and microelectrolysis reactor B, the height of each cylindrical mesh frame II is equal to the height of the cylindrical insulating tank body. ; And / or, in the microbial microvoltage and micro-electrolysis reactor B, the average diameter of the mesh of each cylindrical mesh frame II is 8 mm, and two layers of iron-carbon balls with an average diameter of 10 mm are laid in each cylindrical mesh frame II.

4. The integrated system device according to claim 1 or 2, wherein: In the microbial microvoltage and microelectrolysis reactor B, the carbon fiber felt (16) has a thickness of 10 mm, and before being laid for use, the carbon fiber felt (16) is subjected to an acid pretreatment to remove some functional groups on the surface; the acid pretreatment comprises: soaking the carbon fiber felt (16) in tap water for 2 hours, taking it out, soaking it in 1 mol dilute hydrochloric acid for 6 hours, and then soaking it in 1 mol dilute nitric acid for 6 hours, soaking and rinsing it with tap water until the pH value of the soaking liquid is neutral, and drying it.

5. The integrated system device according to claim 1 or 2, wherein: In the microbial microvoltage and microelectrolysis reactor B, each of the inspection ports V is cylindrical, and has a height-to-diameter ratio of 1:

10.

6. The integrated system device according to claim 1 or 2, wherein: In the micro-aeration and inert solid waste separation reactor C, the third feed inlet (23) is arranged on the tank body of the micro-aeration and inert solid waste separation reactor C. The fourth feed port (24) is arranged at the tank body of the micro-aeration and inert solid waste separation reactor C. The fifth feed port (25) is arranged at the tank body of the micro-aeration and inert solid waste separation reactor C. Department; And / or, the micro-aeration and inert solid waste separation reactor C is connected to an air pump (34).

7. The integrated system device according to claim 1 or 2, wherein: In the microbial microvoltage and microelectrolysis reactor B, the height-to-diameter ratio of the cylindrical insulating tank is 5:1; And / or, in the micro-aeration and inert solid waste separation reactor C, the height-to-diameter ratio of the cylindrical tank body is 5:

1.

8. The integrated system device according to claim 1 or 2, wherein: The volume ratio of the fully mixed continuous stirred tank reactor A to the microbial microvoltage and micro-electrolysis reactor B is 25:1; And / or, the volume ratio of the fully mixed continuous stirred tank reactor A to the micro-aeration and inert solid waste separation reactor C is 25:

1.

9. A method for efficiently anaerobic digestion of organic solid waste using the integrated system device according to any one of claims 1 to 8, characterized in that: The method comprises: (1) placing organic solid waste in a fully mixed continuous stirred tank reactor A for stirring treatment to obtain an intermediate I; (2) placing the intermediate I in a microbial microvoltage and microelectrolysis reactor B for anaerobic digestion, enrichment and loading of efficient bacterial flora, to obtain intermediate II; (3) placing the intermediate II in a micro-aeration and inert solid waste separation reactor C to enhance the activity of anaerobic bacteria to obtain an intermediate III; (4) The intermediate III is returned to the fully mixed continuous stirred tank reactor A to achieve a closed loop system; and is quantitatively discharged through the micro-aeration and inert solid waste separation reactor C according to the hydraulic retention time; The integrated system device described in any one of claims 1 to 8 includes the fully mixed continuous stirred tank reactor A, the microbial microvoltage and micro-electrolysis reactor B, and the micro-aeration and inert solid waste separation reactor C.

10. The method according to claim 9, wherein: In step (2), the power supply voltage of the microbial microvoltage and micro-electrolysis reactor B is adjusted to 0.6V; And / or, in step (3), the value range of the second ORP detection port (28) of the micro-aeration and inert solid waste separation reactor C is -400 to -450 mV.

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