Enzymatic fermentation system and method for livestock and poultry manure with both co2 emission reduction and ch4 production functions

Abstract

The application provides a livestock and poultry manure enzymolysis fermentation system and method with CO2 emission reduction and CH4 production functions, relates to the technical field of livestock and poultry manure fermentation equipment, and comprises the following: an enzymolysis system for performing enzymolysis pretreatment on livestock and poultry manure; an aerobic fermentation system arranged below the enzymolysis system, which performs aerobic fermentation on the livestock and poultry manure pretreated by the enzymolysis system to generate heat and CO2; and an anaerobic fermentation system arranged below the aerobic fermentation system, which uses the heat and CO2 generated by aerobic fermentation to perform anaerobic fermentation on the livestock and poultry manure in the anaerobic fermentation system to generate CH4. The application provides a livestock and poultry manure enzymolysis fermentation system and method with CO2 emission reduction and CH4 production functions, which can improve the efficiency of fermentation reaction, reduce CO2 emission, and improve CH4 production.

Description

Technical Field

[0001] This application relates to the technical field of livestock and poultry manure fermentation equipment, and in particular to a livestock and poultry manure enzymatic hydrolysis fermentation system and method that has both CO2 emission reduction and CH4 production functions. Background Technology

[0002] If the approximately 1.5 billion tons of livestock and poultry manure produced annually nationwide are not effectively treated, they will not only cause serious pollution to water bodies, soil, and air, but also emit large amounts of greenhouse gases such as CO2, becoming a significant factor hindering the construction of a beautiful China and the achievement of the "3060" dual-carbon goals. Against this backdrop, the resource utilization of livestock and poultry manure is essential. Aerobic fermentation is an effective means of realizing the resource utilization of livestock and poultry manure. Under sufficient oxygen conditions, aerobic microorganisms decompose livestock and poultry manure into water, CO2, and stable humus through their own life activities. However, this fermentation method often faces problems such as slow decomposition and long fermentation time. Since the aerobic decomposition of livestock and poultry manure and its chemical transformation into humus are essentially enzymatic reactions catalyzed by relevant enzymes, a suitable enzymatic hydrolysis strategy is an effective way to improve the slow decomposition and maturation problems.

[0003] Furthermore, under this fermentation method, 30% to 60% of the total carbon content of livestock and poultry manure is released as CO2. If this CO2 is directly released into the atmosphere, it will not only exacerbate the greenhouse effect but also become a significant contributing factor to problems such as sea-level rise and frequent extreme weather events.

[0004] Therefore, measures to effectively prevent CO2 emissions are necessary. Compared to aerobic fermentation, under anaerobic conditions, livestock and poultry manure can generate CH4 through the combined action of hydrolytic, acid-producing, and CH4-producing microorganisms, thus achieving its resource utilization. However, without any modification treatment, the CH4 yield of livestock and poultry manure is very low. Since most CH4-producing bacteria can directly utilize CO2 to produce CH4, introducing CO2 into the anaerobic fermentation system of livestock and poultry manure is a feasible method to increase its CH4 yield, but it has obvious problems such as long composting time, high CO2 emissions, and low CH4 yield. Summary of the Invention

[0005] The purpose of this application is to address the above problems by providing an enzymatic fermentation system and method for livestock and poultry manure that combines CO2 emission reduction and CH4 production, thereby improving the efficiency of the fermentation reaction, reducing CO2 emissions, and increasing CH4 production.

[0006] In a first aspect, this application provides a livestock and poultry manure enzymatic hydrolysis and fermentation system with both CO2 emission reduction and CH4 production functions, comprising: an enzymatic hydrolysis system for enzymatic pretreatment of livestock and poultry manure; an aerobic fermentation system disposed below the enzymatic hydrolysis system for aerobic fermentation of the pretreated livestock and poultry manure to generate heat and CO2; and an anaerobic fermentation system disposed below the aerobic fermentation system for anaerobic fermentation of the livestock and poultry manure within the anaerobic fermentation system using the heat and CO2 generated by aerobic fermentation to produce CH4. 4; a heat conduction system, the two ends of which are respectively connected to the aerobic fermentation system and the anaerobic fermentation system to transfer the heat generated by the aerobic fermentation system to the anaerobic fermentation system; a gas transfer system, the two ends of which are respectively connected to the aerobic fermentation system and the anaerobic fermentation system to introduce the CO2 generated by the aerobic fermentation system into the anaerobic fermentation system; and a stirring and cleaning system, used to stir livestock and poultry manure inside the aerobic fermentation system and the anaerobic fermentation system, or to clean the aerobic fermentation system and the anaerobic fermentation system.

[0007] According to the technical solutions provided in certain embodiments of this application, the enzymatic hydrolysis system includes: an enzymatic hydrolysis chamber, the upper inlet of which is provided with a first cap, the outer wall of which is coated with a silica sol heat-absorbing coating, and a heating pipe inside the chamber; four high-pressure pumps, which are respectively arranged in pairs at the top and bottom of the chamber, and each high-pressure pump is provided with a first valve; and a feeding assembly, which is laterally arranged at the lower part of the chamber so that the chamber can be connected to or isolated from the aerobic fermentation system by lateral movement.

[0008] According to the technical solutions provided in certain embodiments of this application, the aerobic fermentation system includes: an aerobic fermentation tank, the upper part of which is connected to the lower part of the enzymatic hydrolysis chamber, an aeration port provided at the upper part of the aerobic fermentation tank, a second valve provided at the aeration port, a first discharge port provided at the bottom of the aerobic fermentation tank, and a third valve provided at the first discharge port.

[0009] According to the technical solutions provided in certain embodiments of this application, the anaerobic fermentation system includes: an anaerobic fermenter, the upper part of which is provided with a feed inlet and a gas collection inlet, a second tank cover is provided at the feed inlet, a fourth valve is provided at the gas collection inlet, and a second discharge outlet is provided at the bottom of the anaerobic fermenter, with a fifth valve provided at the second discharge outlet.

[0010] According to the technical solutions provided in certain embodiments of this application, the heat conduction system includes: two sets of heat collection heads, which are respectively disposed inside the aerobic fermenter and the anaerobic fermenter; and a heat conduction rod, whose two ends are respectively connected to the two sets of heat collection heads to transfer the heat generated by the aerobic fermenter to the anaerobic fermenter.

[0011] According to the technical solutions provided in certain embodiments of this application, the gas transfer system includes: an ammonia removal tank, one end of which is connected to the bottom of the anaerobic fermenter via a second gas guide pipe, the ammonia removal tank containing activated iron powder and also containing a carbonate solution or a bicarbonate solution, and a polytetrafluoroethylene membrane is provided at the connection between the second gas guide pipe and the anaerobic fermenter; a first gas guide pipe, the two ends of which are respectively connected to the top of the aerobic fermenter and the bottom of the ammonia removal tank, and a sixth valve is provided at the connection between the first gas guide pipe and the aerobic fermenter; and a fan, which is installed at the connection between the first gas guide pipe and the aerobic fermenter to transport CO2 generated by aerobic fermentation to the ammonia removal tank.

[0012] According to certain embodiments of this application, the stirring and cleaning system includes: a primary stirring column passing through the aerobic fermenter, wherein a plurality of primary stirring paddles are provided on the outer circumferential surface of the portion of the primary stirring paddle located inside the aerobic fermenter; a secondary stirring column passing through the anaerobic fermenter, wherein a plurality of secondary stirring paddles are provided on the outer circumferential surface of the portion of the secondary stirring column located inside the anaerobic fermenter; a first AC motor connected to the primary stirring column to rotate the primary stirring paddles; a second AC motor connected to the secondary stirring column to rotate the secondary stirring paddles; and a plurality of high-pressure nozzles respectively disposed on the inner wall of the anaerobic fermenter and the inner wall of the aerobic fermenter.

[0013] Secondly, this application provides a method for enzymatic hydrolysis and fermentation of livestock and poultry manure that combines CO2 emission reduction and CH4 production functions. This method is applicable to the enzymatic hydrolysis and fermentation system for livestock and poultry manure described in the first aspect above, which combines CO2 emission reduction and CH4 production functions. The method includes: S1: Opening the first tank lid and placing the livestock and poultry manure and enzyme preparation together into the enzymatic hydrolysis chamber of the enzymatic hydrolysis system; S2: Closing the first tank lid, introducing air into the enzymatic hydrolysis chamber using a high-pressure pump, stopping the air supply when the pressure in the enzymatic hydrolysis chamber reaches 0.4 MPa, and starting the heating tube to maintain a heating temperature of 40°C to 60°C for enzymatic pretreatment of the livestock and poultry manure; S3: After enzymatic hydrolysis, pulling the feeding assembly to connect the enzymatic hydrolysis chamber to the aerobic fermentation tank of the aerobic fermentation system, so that the pretreated livestock and poultry manure enters the aerobic fermentation tank of the aerobic fermentation system. Simultaneously, opening the second valve, introducing fresh air intermittently into the aerobic fermentation tank through the aeration port, and starting the first AC motor to fully stir the livestock and poultry manure in the aerobic fermentation tank for aerobic hydrolysis. Fermentation: S4: Turn on the switch of the third temperature sensor to measure the temperature of livestock and poultry manure in real time during the aerobic fermentation process; S5: After the aerobic fermentation process is completed, add livestock and poultry manure into the anaerobic fermentation tank of the anaerobic fermentation system through the feed inlet, open the fourth valve, and extract the air from the anaerobic fermentation tank through the gas collection port. When the gas pressure reaches 0.6 kPa, stop the gas extraction and close the fourth valve; S6: Open the sixth valve to allow the CO2 generated by aerobic fermentation in the aerobic fermentation tank to be transported to the anaerobic fermentation tank through the first gas guide pipe, the deammoniation tank, and the second gas guide pipe; S7: Connect the gas collection bag at the gas collection port, open the fourth valve, start the AC motor, and use the secondary stirring paddle to fully stir the livestock and poultry manure in the anaerobic fermentation tank to produce CH4 through anaerobic fermentation; S8: After the anaerobic fermentation is completed, open the third and fifth valves to discharge the livestock and poultry manure from the aerobic fermentation tank and the anaerobic fermentation tank; S9: Clean the aerobic fermentation tank and the anaerobic fermentation tank through multiple high-pressure nozzles respectively.

[0014] According to the technical solutions provided in certain embodiments of this application, the enzyme preparation can be any one of ligninase, cellulase and hemicellulase, the enzymatic hydrolysis time is two to three days, and intermittent ventilation is adopted during aerobic fermentation, with a ventilation interval of 10 min to 30 min, a ventilation rate of 0.3 L / (min·kg), and an initial pH value of 6.5 to 7.5.

[0015] According to the technical solutions provided in certain embodiments of this application, when the temperature of the pile in the aerobic fermentation system is close to the ambient temperature, aerobic fermentation is stopped; the initial pH value of livestock and poultry manure in anaerobic fermentation is 6.8 to 7.2, the temperature of anaerobic fermentation is 39°C, and when the daily CH4 content in the gas collection bag is detected to be lower than 5% of the total gas content in the gas collection bag for three consecutive days, anaerobic fermentation is stopped.

[0016] Compared with existing technologies, the beneficial effects of this application are as follows: The livestock and poultry manure enzymatic fermentation system of this application, which combines CO2 emission reduction and CH4 production, integrates the traditionally separate enzymatic hydrolysis, aerobic, and anaerobic systems into a single device. Through a heat conduction system and a gas transfer system, it achieves the directional transfer and recycling of heat and CO2 between the aerobic and anaerobic stages. This forms a processing chain: pretreatment, aerobic fermentation to generate heat and CO2, and anaerobic reaction to utilize heat and CO2 to produce CH4. The enzymatic hydrolysis reaction improves the overall fermentation efficiency and speed. Simultaneously, it reduces CO2 emissions and increases CH4 production, achieving the synergistic goals of high efficiency, energy saving, and emission reduction.

[0017] It should be understood that the descriptions of technical features, technical solutions, beneficial effects, or similar language in this application do not imply that all features and advantages can be achieved in any single embodiment. Rather, it is understood that the description of a feature or beneficial effect means that a specific technical feature, technical solution, or beneficial effect is included in at least one embodiment. Therefore, the descriptions of technical features, technical solutions, or beneficial effects in this specification do not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions, and beneficial effects described in this embodiment can be combined in any suitable manner. Those skilled in the art will understand that embodiments can be implemented without one or more specific technical features, technical solutions, or beneficial effects of a particular embodiment. In other embodiments, additional technical features and beneficial effects may be identified in specific embodiments that do not embody all embodiments. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the structure of a livestock and poultry manure enzymatic hydrolysis fermentation system that combines CO2 emission reduction and CH4 production functions, provided in the first aspect of this application; Figure 2 A partially enlarged view of the enzymatic hydrolysis system of a livestock and poultry manure enzymatic hydrolysis fermentation system that has both CO2 emission reduction and CH4 production functions, provided in the first aspect of this application. Figure 3 A partially enlarged view of the heat conduction system of a livestock and poultry manure enzymatic hydrolysis fermentation system that combines CO2 emission reduction and CH4 production functions, provided in the first aspect of this application. Figure 4A partially enlarged view of the deammoniation tank and the second gas pipe of a livestock and poultry manure enzymatic hydrolysis fermentation system that combines CO2 emission reduction and CH4 production functions, provided for the first aspect of this application. Figure 5 A flowchart illustrating a method for enzymatic hydrolysis and fermentation of livestock and poultry manure that combines CO2 emission reduction and CH4 production, provided as an embodiment of the second aspect of this application.

[0020] The text labels in the image represent: 1. Enzymatic hydrolysis system; 7. First tank lid; 8. Enzymatic hydrolysis chamber; 9. High-pressure pump; 10. Heating element; 11. Feeding assembly; 2. Aerobic fermentation system; 12. Aerobic fermenter; 13. Aeration port; 14. First discharge port; 3. Anaerobic fermentation system; 15. Anaerobic fermenter; 16. Feed inlet; 17. Gas collection port; 18. Second discharge port; 4. Heat conduction system; 19. Heat collector head; 20. Heat conduction rod; 5. Gas transfer system; 21. First gas guide pipe; 22. Fan; 23. Ammonia removal tank; 24. Second gas guide pipe; 6. Mixing and cleaning system; 25. Primary mixing column; 26. Primary mixing paddle; 27. Secondary mixing column; 28. Secondary mixing paddle; 29. ​​First AC motor; 30. Secondary AC motor; 31. High-pressure nozzle; 32. First valve; 33. Fireproof rock wool board; 34. Third temperature sensor; 35. Second valve; 36. Third valve; 37. Second can lid; 38. Fourth valve; 39. Fifth valve; 40. Self-adhesive insulation cotton; 41. Sixth valve; 42. Polytetrafluoroethylene film. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. The descriptions in this section are merely illustrative and explanatory, and should not be construed as limiting the scope of protection of this application. Specifically, the described embodiments are only some embodiments of this application, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort should fall within the scope of protection of this application.

[0022] It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product, or apparatus.

[0023] As mentioned in the background section, the annual output of approximately 1.5 billion tons of livestock and poultry manure in China, if not effectively treated, will not only cause serious pollution of water bodies, soil, and air, but also emit large amounts of greenhouse gases such as CO2, becoming a significant factor hindering the construction of a beautiful China and the achievement of the "3060" dual-carbon goals. Against this backdrop, the resource utilization of livestock and poultry manure is essential. Aerobic fermentation is an effective means of realizing the resource utilization of livestock and poultry manure. Under sufficient oxygen conditions, aerobic microorganisms decompose livestock and poultry manure into water, CO2, and stable humus through their own life activities. However, this fermentation method often faces problems such as slow decomposition and long fermentation time. Since the aerobic decomposition of livestock and poultry manure and its chemical transformation into humus are essentially enzymatic reactions catalyzed by relevant enzymes, a suitable enzymatic hydrolysis strategy is an effective way to improve the slow decomposition and maturation problems.

[0024] Furthermore, under this fermentation method, 30% to 60% of the total carbon content of livestock and poultry manure is released as CO2. If this CO2 is directly released into the atmosphere, it will not only exacerbate the greenhouse effect but also become a significant contributing factor to problems such as sea-level rise and frequent extreme weather events.

[0025] Therefore, measures to effectively prevent CO2 emissions are necessary. Compared to aerobic fermentation, under anaerobic conditions, livestock and poultry manure can generate CH4 through the combined action of hydrolytic, acid-producing, and CH4-producing microorganisms, thus achieving its resource utilization. However, without any modification treatment, the CH4 yield of livestock and poultry manure is very low. Since most CH4-producing bacteria can directly utilize CO2 to produce CH4, introducing CO2 into the anaerobic fermentation system of livestock and poultry manure is a feasible method to improve its CH4 yield.

[0026] As seen from the above process, combining the enzymatic hydrolysis, aerobic, and anaerobic fermentation processes of livestock and poultry manure into one can not only achieve rapid composting and effective CO2 emission reduction, but also generate CH4 energy. This has a positive effect on realizing the resource utilization of livestock and poultry manure, alleviating the energy shortage crisis, and improving the urban and rural living environment. However, there are obvious problems such as long composting time, high CO2 emissions, and low CH4 yield.

[0027] To address the problems in the existing technology, this embodiment provides a livestock and poultry manure enzymatic hydrolysis fermentation system and method that combines CO2 emission reduction and CH4 production functions. The following description, in conjunction with the appendix to the specification, will first... Figures 1-4 The first aspect describes a livestock and poultry manure enzymatic fermentation system that combines CO2 emission reduction and CH4 production.

[0028] like Figure 1 As shown, the livestock and poultry manure enzymatic hydrolysis fermentation system of this application, which combines CO2 emission reduction and CH4 production functions, includes an enzymatic hydrolysis system 1, an aerobic fermentation system 2, an anaerobic fermentation system 3, a heat conduction system 4, a gas transfer system 5, and a stirring and cleaning system 6.

[0029] Specifically, the enzymatic hydrolysis system 1 is used for enzymatic pretreatment of livestock and poultry manure. Enzymatic pretreatment of livestock and poultry manure improves the efficiency of subsequent aerobic and anaerobic fermentation. The aerobic fermentation system 2 is located below the enzymatic hydrolysis system 1, and aerobically ferments the pretreated livestock and poultry manure to generate heat and CO2. The anaerobic fermentation system 3 is located below the aerobic fermentation system 2, and uses the heat and CO2 generated by aerobic fermentation to anaerobically ferment the livestock and poultry manure in the anaerobic fermentation system 3 to generate CH4. The two ends of the heat conduction system 4 are connected to both the aerobic fermentation system 2 and the anaerobic fermentation system 3 to transfer the heat generated by the aerobic fermentation system 2 to the anaerobic fermentation system 3; the two ends of the gas transfer system 5 are connected to both the aerobic fermentation system 2 and the anaerobic fermentation system 3 to introduce the CO2 generated by the aerobic fermentation system 2 into the anaerobic fermentation system 3. The mixing and cleaning system 6 is used to mix livestock and poultry manure inside the aerobic fermentation system 2 and the anaerobic fermentation system 3, or to clean the aerobic fermentation system 2 and the anaerobic fermentation system 3.

[0030] The livestock and poultry manure enzymatic fermentation system of this application, which combines CO2 emission reduction and CH4 production, integrates the traditionally separate enzymatic, aerobic, and anaerobic systems into a single device. A heat conduction system 4 and a gas transfer system 5 facilitate the directional transfer and recycling of heat and CO2 between the aerobic and anaerobic stages. This forms a processing chain: pretreatment, aerobic fermentation to generate heat and CO2, and anaerobic reaction to utilize heat and CO2 to produce CH4. Enzymatic fermentation improves the overall fermentation efficiency and speed, while simultaneously reducing CO2 emissions and increasing CH4 production. This achieves the synergistic goals of high efficiency, energy saving, and emission reduction.

[0031] Furthermore, this application overcomes the technical barrier that prevents aerobic and anaerobic fermentation from coexisting in the same physical space due to differences in oxygen demand and operating conditions, such as temperature and initial pH. The system configuration of this application allows aerobic fermentation system 2 and anaerobic fermentation system 3 to operate stably under their respective temperature and initial pH conditions, while effectively reducing CO2 emissions and generating CH4 energy—achieving three benefits in one. Moreover, enzymatic hydrolysis system 1 does not require microbial participation, while aerobic fermentation system 2 does. Directly coupling the two into one system would adversely affect the enzymes or microorganisms due to differences in temperature and pH conditions. This application, through the control of the feeding component 11, can separate enzymatic hydrolysis system 1 and aerobic fermentation system 2, allowing them to operate under their respective suitable environmental conditions, while also rapidly delivering the enzymatically hydrolyzed livestock and poultry manure to aerobic fermentation system 2, shortening the aerobic fermentation time.

[0032] In some embodiments of this application, the enzymatic hydrolysis system 1 includes an enzymatic hydrolysis chamber 8, a feeding assembly 11, and four high-pressure pumps 9.

[0033] Specifically, such as Figure 2 As shown, the upper feed inlet of the enzymatic hydrolysis chamber 8 is equipped with a first can lid 7. The outer wall of the enzymatic hydrolysis chamber 8 is coated with a silica sol heat-absorbing coating, and a heating tube 10 is installed inside the enzymatic hydrolysis chamber 8. The silica sol heat-absorbing coating on the outer wall of the enzymatic hydrolysis chamber 8 helps to absorb heat from the external environment. Combined with the internal heating tube 10, it can control the temperature required for enzymatic hydrolysis between 40℃ and 60℃. The enzymatic hydrolysis chamber 8 is equipped with a first temperature sensor (not shown in the figure, a standard configuration) that is linked to the heating tube 10. The first temperature sensor monitors the temperature of the enzymatically hydrolyzed material in real time. When the temperature is below 40℃, the controller automatically starts the heating tube 10; when the temperature reaches 60℃, it automatically stops heating or switches to the heat preservation mode, thereby stabilizing the enzymatic hydrolysis temperature within the process range of 40℃ to 60℃. The heating tube 10 is made of iron-chromium-aluminum alloy. The space between the outer and inner walls of the enzymatic hydrolysis chamber 8 is filled with fireproof rock wool board 33. Four high-pressure pumps 9 are positioned in pairs at the top and bottom of the enzymatic hydrolysis chamber 8. These symmetrically positioned pumps uniformly pressurize the chamber, creating a high-pressure environment conducive to the full contact and reaction between the enzyme preparation and livestock manure. Each high-pressure pump 9 is equipped with a first valve 32, which controls its opening and closing. A feeding assembly 11 is laterally positioned at the lower part of the enzymatic hydrolysis chamber 8, allowing it to connect or isolate the chamber from the aerobic fermentation system 2 through lateral movement. This laterally moving feeding assembly 11 is simple and reliable, achieving both sealed isolation and rapid connection between the enzymatic hydrolysis chamber 8 and the aerobic fermentation tank 12, ensuring the continuity of batch operations. This significantly improves the efficiency of enzymatic pretreatment, laying the foundation for rapid start-up and maturation of subsequent aerobic fermentation.

[0034] In some embodiments of this application, such as Figure 1As shown, the aerobic fermentation system 2 includes an aerobic fermenter 12, the upper part of which is connected to the lower part of the enzymatic hydrolysis chamber 8. The upper part of the aerobic fermenter 12 is provided with an aeration port 13, and a second valve 35 is provided at the aeration port 13. The bottom of the aerobic fermenter 12 is provided with a first discharge port 14, and a third valve 36 is provided at the first discharge port 14.

[0035] Specifically, such as Figure 1 As shown, the aerobic fermenter 12 directly receives material from the enzymatic hydrolysis chamber 8 above, ensuring a smooth flow. The aeration port 13 at the top of the aerobic fermenter 12 is used to intermittently introduce air, providing oxygen for the aerobic microorganisms. The first discharge port 14 at the bottom is used to discharge the fermented material. This allows the aerobic fermentation process to be completed within a single tank, resulting in a compact structure that facilitates heat collection via the heat collectors 19 on the side walls and gas collection via the first gas guide pipe 21 at the top.

[0036] In some embodiments of this application, the anaerobic fermentation system 3 includes an anaerobic fermenter 15. The upper part of the anaerobic fermenter 15 is provided with a feed inlet 16 and a gas collection port 17. The feed inlet 16 is provided with a second tank cover 37. The gas collection port 17 is provided with a fourth valve 38. The bottom of the anaerobic fermenter 15 is provided with a second discharge port 18. The second discharge port 18 is provided with a fifth valve 39.

[0037] like Figure 1 As shown, the anaerobic fermenter 15 is located below the aerobic fermenter 12. The feed inlet 16 at the top of the anaerobic fermenter 15 is used to feed fresh or partially fermented manure as the anaerobic substrate, and the gas collection port 17 is used to collect the generated CH4. The second discharge port 18 at the bottom is used to discharge fermentation residue. This allows heat from the aerobic fermenter 12 above to be transferred to the anaerobic fermenter 15 through the heat collection head 19 at the bottom of the aerobic fermenter 12, and CO2 to be introduced through the second gas guide pipe 24, naturally and efficiently serving the anaerobic fermentation process, resulting in a high degree of physical integration.

[0038] In some embodiments of this application, both the aerobic fermenter 12 and the anaerobic fermenter 15 can be made of 304 stainless steel.

[0039] In some embodiments of this application, the heat conduction system 4 includes a heat conduction rod 20 and two sets of heat collection heads 19, which are respectively disposed inside the aerobic fermenter 12 and the anaerobic fermenter 15; the two ends of the heat conduction rod 20 are respectively connected to the two sets of heat collection heads 19 to transfer the heat generated by the aerobic fermenter 12 to the anaerobic fermenter 15.

[0040] like Figure 3As shown, the heat collection head 19, located inside the side wall of the aerobic fermenter 12, is immersed in the fermenting livestock and poultry manure, efficiently capturing the bioheat released by aerobic microorganisms decomposing organic matter. The heat is directionally conducted to another set of heat collection heads 19 located at the bottom of the anaerobic fermenter 15, thus providing a suitable temperature environment for the anaerobic reaction to produce CH4. The anaerobic fermenter 15 is equipped with a second temperature sensor (not shown in the figure, a standard configuration) for real-time monitoring of the anaerobic material temperature. The heat conduction system 4 continuously transfers heat. When the second temperature sensor detects that the temperature has reached the suitable range for mesophilic anaerobic fermentation (39℃±3℃), the system maintains the current heat conduction state. If the temperature exceeds the upper limit of the range, it is adjusted through auxiliary cooling methods, such as installing a coil (not shown in the figure) on the outside of the anaerobic fermenter 15 wall to introduce ambient temperature cooling water to accelerate cooling. If the temperature is insufficient, it is compensated by an auxiliary heating device (such as installing heating pipes inside the anaerobic fermenter 15). It should be noted that 39℃ is only the target operating temperature, and steady-state maintenance is achieved through feedback from the second temperature sensor. This system enables the reuse of heat within the system, significantly reducing the dependence of anaerobic fermentation on external heating energy and resulting in remarkable energy savings.

[0041] Furthermore, both the heat collector head 19 and the heat-conducting rod 20 can be made of copper-nickel alloy. The heat-conducting rod 20 is a solid rod, and the heat-conducting rod 20 is wrapped with self-adhesive insulation cotton 40.

[0042] In some embodiments of this application, such as Figure 1 and Figure 4 As shown, the gas transfer system 5 includes an ammonia removal tank 23, a first gas guide pipe 21, and a fan 22.

[0043] Specifically, such as Figure 4 As shown, one end of the ammonia removal tank 23 is connected to the bottom of the anaerobic digester 15 via a second gas guide pipe 24. The ammonia removal tank 23 contains activated iron powder and also contains carbonate solution or bicarbonate solution. A polytetrafluoroethylene membrane 42 is provided at the connection between the second gas guide pipe 24 and the anaerobic digester 15. Figure 1As shown, the two ends of the first gas guide pipe 21 are connected to the top of the aerobic fermenter 12 and the bottom of the deammoniation tank 23, respectively. A sixth valve 41 is provided at the connection between the first gas guide pipe 21 and the aerobic fermenter 12. A fan 22 is installed at the connection between the first gas guide pipe 21 and the aerobic fermenter 12 to transport the gas generated by aerobic fermentation to the deammoniation tank 23. The deammoniation tank 23 removes the ammonia generated by aerobic fermentation, and activated iron powder is used as a deoxidizer to remove the residual oxygen remaining from aerobic fermentation, transporting CO2 to the anaerobic fermentation system 3. The output of other gases generated by aerobic fermentation is small and its impact on anaerobic fermentation is negligible. A detachable mesh filter box is provided at the top of the deammoniation tank 23 to hold activated iron powder. After a period of use, the performance of the activated iron powder decreases, and the filter box can be removed to replace it with new activated iron powder.

[0044] The first gas guide pipe 21, the second gas guide pipe 24, and the ammonia removal tank 23 are all made of 304 stainless steel.

[0045] Thus, the gas transfer system 5 enables carbon cycling and emission reduction. Gas produced by aerobic fermentation enters the ammonia removal tank 23 via the first gas guide pipe 21, driven by the fan 22. The carbonate or bicarbonate solution in the ammonia removal tank 23 effectively absorbs and removes ammonia, purifying CO2. Subsequently, the purified CO2 is introduced to the bottom of the anaerobic fermenter 15 through the second gas guide pipe 24 to improve the efficiency of CH4 production in the anaerobic reaction. The polytetrafluoroethylene membrane 42 prevents the anaerobic fermentation liquid of livestock and poultry manure from seeping into the ammonia removal tank 23. Converting CO2, which was originally waste, into a resource reduces greenhouse gas emissions and increases CH4 yield.

[0046] In some embodiments of this application, such as Figure 1 As shown, the stirring and cleaning system 6 includes a primary stirring column 25, a secondary stirring column 27, a first AC motor 29, a second AC motor 30, and multiple high-pressure nozzles 31.

[0047] Specifically, such as Figure 1 As shown, a primary stirring column 25 passes through an aerobic fermenter 12, and multiple primary stirring paddles 26 are provided on the outer circumference of the portion of the primary stirring column 25 inside the aerobic fermenter 12; a secondary stirring column 27 passes through an anaerobic fermenter 15, and multiple secondary stirring paddles 28 are provided on the outer circumference of the portion of the secondary stirring column 27 inside the anaerobic fermenter 15; a first AC motor 29 is connected to the primary stirring column 25 to rotate the primary stirring paddles 26; a second AC motor 30 is connected to the secondary stirring column 27 to rotate the secondary stirring paddles 28. Multiple high-pressure nozzles 31 are respectively installed on the inner walls of the anaerobic fermenter 15 and the aerobic fermenter 12.

[0048] The primary stirring column 25, secondary stirring column 27, primary stirring paddle 26, secondary stirring paddle 28, and high-pressure nozzle 31 are all made of 304 stainless steel. The portion of the primary stirring column 25 that penetrates the aerobic fermenter 12 is equipped with a mechanical dynamic seal structure (i.e., the cooperation of the dynamic ring and the stationary ring), and the portion of the secondary stirring column 27 that penetrates the anaerobic fermenter 15 is also equipped with a mechanical dynamic seal structure (i.e., the cooperation of the dynamic ring and the stationary ring), thereby preventing leakage at the penetration points.

[0049] like Figure 1 As shown, the stirring and cleaning system 6 adopts an independently driven design. A first AC motor 29 drives a primary stirring paddle 26 to stir the material in the aerobic fermenter 12, meeting the high requirements for oxygen diffusion and uniformity in the aerobic process. A second AC motor 30 drives a secondary stirring paddle 28 to stir the material in the anaerobic fermenter 15, promoting mass transfer and preventing crust formation. Both motors are power-providing drive devices and can be independently controlled to adapt to the stirring needs of different fermentation stages. High-pressure nozzles 31, fixedly distributed on the tank wall, can thoroughly clean the tank after each batch, ensuring hygiene and preventing cross-contamination. This improves fermentation efficiency and system operational stability. The high-pressure nozzles are commercially available standard parts.

[0050] A support column is provided between the aerobic fermenter 12 and the anaerobic fermenter 15 to support the aerobic fermenter 12. The lower surface of the anaerobic fermenter 15 also has a support column, which can support the anaerobic fermenter 15 and maintain a distance between the anaerobic fermenter 15 and the ground to prevent the second discharge port 18 from being blocked.

[0051] In addition, such as Figure 1 As shown, the aerobic fermenter 12 is equipped with multiple third temperature sensors 34, which can monitor the temperature during the aerobic fermentation process.

[0052] According to the enzymatic fermentation method for livestock and poultry manure with both CO2 emission reduction and CH4 production functions according to the second aspect of this application, the enzymatic fermentation system for livestock and poultry manure with both CO2 emission reduction and CH4 production functions of the first aspect is applicable, such as... Figure 5 As shown, the method includes: S1: Open the first can lid 7 and put the livestock and poultry manure and enzyme preparation into the enzymatic hydrolysis chamber 8 of the enzymatic hydrolysis system 1 together; S2: Close the first tank lid 7, and introduce air into the enzymatic hydrolysis chamber 8 through the high-pressure pump 9. Stop the air supply when the pressure inside the enzymatic hydrolysis chamber 8 reaches 0.4MPa, and start the heating tube 10 to heat the temperature to 40°C to 60°C for enzymatic pretreatment of livestock and poultry manure; wherein, a first pressure sensor is installed at the top of the enzymatic hydrolysis chamber 8 to monitor the pressure inside the enzymatic hydrolysis chamber 8 in real time. When the pressure inside the enzymatic hydrolysis chamber 8 reaches 0.4MPa, the system automatically closes the first valve 32; S3: After enzymatic hydrolysis, pull the feeding component 11 to connect the enzymatic hydrolysis chamber 8 with the aerobic fermentation tank 12 of the aerobic fermentation system 2, so that the pretreated livestock and poultry manure enters the aerobic fermentation tank 12 of the aerobic fermentation system 2. At the same time, open the second valve 35 and introduce fresh air into the aerobic fermentation tank 12 intermittently through the aeration port 13. Start the first AC motor 29 to make the first stage stirring paddle 26 fully stir the livestock and poultry manure in the aerobic fermentation tank 12 for aerobic fermentation. Turn on the switch of the third temperature sensor 34 to measure the temperature of the livestock and poultry manure in real time during the aerobic fermentation process. S4: After the aerobic fermentation process is completed, livestock and poultry manure is added to the anaerobic fermentation tank 15 of the anaerobic fermentation system 3 through the feed inlet 16. The fourth valve 38 is opened, and the air in the anaerobic fermentation tank 15 is extracted through the gas collection port 17. When the air pressure reaches 0.6 kPa, the extraction is stopped, and the fourth valve 38 is closed. The anaerobic fermentation tank 15 is equipped with a second pressure sensor to monitor the pressure inside the anaerobic fermentation tank 15 in real time. When the pressure inside the anaerobic fermentation tank 15 reaches 0.6 kPa, the system automatically closes the fourth valve 38. S5: Open the sixth valve 41 to allow the CO2 generated by aerobic fermentation in the aerobic fermenter 12 to be transported sequentially through the first gas pipe 21, the ammonia removal tank 23 and the second gas pipe 24 to the anaerobic fermenter 15. S6: Connect the gas collection bag to the gas collection port 17, open the fourth valve 38, start the second AC motor 30, and use the secondary stirring paddle 28 to fully stir the livestock and poultry manure in the anaerobic fermentation tank 15 to produce CH4 through anaerobic fermentation. S7: After anaerobic fermentation is completed, open the third valve 36 and the fifth valve 39 to discharge the livestock and poultry manure in the aerobic fermentation tank 12 and the anaerobic fermentation tank 15. S8: The aerobic fermenter 12 and the anaerobic fermenter 15 are cleaned by multiple high-pressure nozzles 31 respectively.

[0053] Specifically, such as Figure 5 As shown, this method is the operational flow of an integrated enzymatic fermentation system for livestock and poultry manure that combines CO2 emission reduction and CH4 production. It sequentially executes three stages: enzymatic hydrolysis, aerobic fermentation, and anaerobic fermentation, and actively controls the heat conduction system 4 and the gas transfer system 5 to achieve cross-stage utilization of heat and CO2. This fully leverages the system's design advantages, stably producing rapidly decomposed fertilizer and high-yield CH4, while simultaneously achieving net CO2 emission reduction. The method is highly operable and reproducible.

[0054] In some embodiments of this application, the enzyme preparation is any one of ligninase, cellulase and hemicellulase, the enzymatic hydrolysis time is two to three days, and intermittent ventilation is used during aerobic fermentation, with an interval of 10 min to 30 min, a ventilation rate of 0.3 L / (min·kg), and an initial pH value of 6.5 to 7.5.

[0055] Specifically, the use of compound enzyme preparations and control of appropriate pressure, temperature, and time can efficiently break down the lignocellulose structure in feces. An optimized intermittent ventilation strategy is employed during the aerobic stage, such as ventilating for 30 minutes followed by stopping for 30 minutes. This ensures adequate oxygen for microorganisms while controlling excessive heat dissipation, facilitating heat accumulation within the tank and recovery by the heat conduction system. Adjusting the initial pH to between 6.5 and 7.5 creates an optimal environment for aerobic microorganism activity. The synergistic effect of these parameters ensures efficient and rapid maturation during the aerobic fermentation stage.

[0056] In some embodiments of this application, aerobic fermentation is stopped when the temperature of the pile in the aerobic fermentation system 2 approaches the ambient temperature; the initial pH value of the livestock and poultry manure in anaerobic fermentation is 6.8 to 7.2, and the temperature of anaerobic fermentation is about 39°C. When the daily CH4 content in the gas collection bag is detected to be less than 5% of the total gas content in the gas collection bag for three consecutive days, anaerobic fermentation is stopped.

[0057] Specifically, the ambient temperature mentioned above varies depending on the region, season, and whether it is indoor or outdoor, and is determined according to the system's operating environment. The ambient temperature can be between 20 and 25°C. Maintaining the pH at a weakly acidic to neutral range of 6.8-7.2, and using the heat conduction system 4 to maintain a mesophilic fermentation condition of approximately 39°C, can improve CH4 yield. When the daily CH4 production in the gas collection bag is consistently below 5% of the total daily gas content for three consecutive days, anaerobic fermentation stops, avoiding unnecessary extension of fermentation time and improving equipment utilization. Combined with the introduction of pure CO2, this constitutes a process guarantee for high CH4 production. The gas produced by anaerobic fermentation is a mixed gas, of which 50%-70% is CH4, 25%-50% is CO2, and small amounts of ammonia and hydrogen sulfide. If the percentage of daily CH4 production in the mixed gas is consistently below 5% of the total gas content for three consecutive days, anaerobic fermentation can be terminated.

[0058] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. The above descriptions are only preferred embodiments of this application. It should be noted that due to the limitations of textual expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the concept and technical solution of the application to other occasions without modification, should all be considered within the scope of protection of this application.

Claims

1. A livestock and poultry manure enzymatic fermentation system that combines CO2 emission reduction and CH4 production functions, characterized in that, include: Enzymatic hydrolysis system (1) is used for enzymatic pretreatment of livestock and poultry manure, wherein the enzymatic hydrolysis system (1) comprises: The enzymatic hydrolysis chamber (8) has a first can cover (7) at the upper feed inlet. The outer wall of the enzymatic hydrolysis chamber (8) is coated with a silica sol heat-absorbing coating. The interior of the enzymatic hydrolysis chamber (8) is equipped with a heating tube (10). Four high-pressure pumps (9) are installed in pairs at the top and bottom of the enzymatic hydrolysis chamber (8), and each high-pressure pump (9) is equipped with a first valve (32). Feeding assembly (11) is laterally positioned at the lower part of the enzymatic hydrolysis chamber (8) so that the enzymatic hydrolysis chamber (8) can be connected to or isolated from the aerobic fermentation system (2) by lateral movement; An aerobic fermentation system (2) is located below the enzymatic hydrolysis system (1) to aerobically ferment livestock and poultry manure that has undergone enzymatic hydrolysis pretreatment by the enzymatic hydrolysis system (1) to generate heat and CO2. The aerobic fermentation system (2) includes: An aerobic fermenter (12), the upper part of which is connected to the lower part of the enzymatic hydrolysis chamber (8); Anaerobic fermentation system (3), the anaerobic fermentation system (3) is located below the aerobic fermentation system (2), and uses the heat and CO2 generated by aerobic fermentation to anaerobic ferment the livestock and poultry manure in the anaerobic fermentation system (3) to produce CH4. The anaerobic fermentation system (3) includes an anaerobic fermentation tank (15). A heat conduction system (4), the two ends of which are respectively connected to the aerobic fermentation system (2) and the anaerobic fermentation system (3) to transfer the heat generated by the aerobic fermentation system (2) to the anaerobic fermentation system (3), the heat conduction system (4) comprising: Two sets of heat collection heads (19) are respectively installed inside the aerobic fermenter (12) and the anaerobic fermenter (15); A heat-conducting rod (20) is provided, with its two ends connected to two sets of heat collection heads (19) to transfer the heat generated by the aerobic fermenter (12) to the anaerobic fermenter (15). A gas transfer system (5), the two ends of which are respectively connected to the aerobic fermentation system (2) and the anaerobic fermentation system (3) to introduce CO2 generated by the aerobic fermentation system (2) into the anaerobic fermentation system (3), the gas transfer system (5) comprising: Ammonia removal tank (23) is connected at one end to the bottom of the anaerobic fermenter (15) via a second gas guide pipe (24). The ammonia removal tank (23) contains active iron powder and also contains carbonate solution or bicarbonate solution. A polytetrafluoroethylene membrane (42) is provided at the connection between the second gas guide pipe (24) and the anaerobic fermenter (15). The first air guide pipe (21) is connected to the top of the aerobic fermenter (12) and the bottom of the deammoniation tank (23) at both ends. A sixth valve (41) is provided at the connection between the first air guide pipe (21) and the aerobic fermenter (12). A fan (22) is installed at the connection between the first air guide pipe (21) and the aerobic fermentation tank (12) to transport the CO2 generated by aerobic fermentation to the deammoniation tank (23). The stirring and cleaning system (6) is used to stir livestock and poultry manure inside the aerobic fermentation system (2) and the anaerobic fermentation system (3), or to clean the aerobic fermentation system (2) and the anaerobic fermentation system (3).

2. The livestock and poultry manure enzymatic fermentation system with CO2 emission reduction and CH4 production functions according to claim 1, characterized in that, The aerobic fermenter (12) is provided with an aeration port (13) at the top, and a second valve (35) is provided at the aeration port (13). The aerobic fermenter (12) is provided with a first discharge port (14) at the bottom, and a third valve (36) is provided at the first discharge port (14).

3. The livestock and poultry manure enzymatic fermentation system with both CO2 emission reduction and CH4 production functions according to claim 2, characterized in that, The anaerobic fermenter (15) is provided with a feed inlet (16) and a gas collection port (17) at the top. A second tank cover (37) is provided at the feed inlet (16). A fourth valve (38) is provided at the gas collection port (17). A second discharge port (18) is provided at the bottom of the anaerobic fermenter (15). A fifth valve (39) is provided at the second discharge port (18).

4. The livestock and poultry manure enzymatic fermentation system with CO2 emission reduction and CH4 production functions according to claim 3, characterized in that, The stirring and cleaning system (6) includes: A primary stirring column (25) passes through the aerobic fermentation tank (12), and a plurality of primary stirring blades (26) are provided on the outer circumference of the portion of the primary stirring column (25) inside the aerobic fermentation tank (12). A secondary stirring column (27) passes through the anaerobic fermenter (15), and the outer circumferential surface of the part of the secondary stirring column (27) inside the anaerobic fermenter (15) is provided with multiple secondary stirring paddles (28). A first AC motor (29) is connected to the first-stage stirring column (25) to make the first-stage stirring paddle (26) rotate; The second AC motor (30) is connected to the secondary stirring column (27) to make the secondary stirring paddle (28) rotate; Multiple high-pressure nozzles (31) are respectively disposed on the inner wall of the anaerobic fermenter (15) and the inner wall of the aerobic fermenter (12).

5. A method for enzymatic fermentation of livestock and poultry manure that combines CO2 emission reduction and CH4 production, characterized in that, The enzymatic hydrolysis fermentation system for livestock and poultry manure, which combines CO2 emission reduction and CH4 production functions as described in any one of claims 1 to 4, comprises the following method: S1: Open the first can lid (7) and put the livestock and poultry manure and enzyme preparation into the enzymatic hydrolysis chamber (8) of the enzymatic hydrolysis system (1); S2: Close the first can lid (7), and introduce air into the enzymatic hydrolysis chamber (8) through the high-pressure pump (9). Stop the air supply when the pressure in the enzymatic hydrolysis chamber (8) reaches 0.4MPa, and start the heating tube (10) to make the heating temperature between 40°C and 60°C for enzymatic hydrolysis pretreatment of livestock and poultry manure. S3: After the enzymatic hydrolysis is completed, pull the feeding assembly (11) to connect the enzymatic hydrolysis chamber (8) with the aerobic fermentation tank (12) of the aerobic fermentation system (2) so that the pretreated livestock and poultry manure enters the aerobic fermentation tank (12) of the aerobic fermentation system (2). At the same time, open the second valve (35) and introduce fresh air into the aerobic fermentation tank (12) intermittently through the aeration port (13). Start the first AC motor (29) to make the first stage stirring paddle (26) fully stir the livestock and poultry manure in the aerobic fermentation tank (12) for aerobic fermentation. Turn on the switch of the third temperature sensor (34) to measure the temperature of the livestock and poultry manure in the aerobic fermentation process in real time. S4: After the aerobic fermentation process is completed, livestock and poultry manure is added to the anaerobic fermentation tank (15) of the anaerobic fermentation system (3) through the feed inlet (16), the fourth valve (38) is opened, and the air in the anaerobic fermentation tank (15) is extracted through the gas collection port (17). When the gas pressure reaches 0.6 kPa, the extraction is stopped and the fourth valve (38) is closed. S5: Open the sixth valve (41) so that the CO2 generated by aerobic fermentation in the aerobic fermenter (12) is transported to the anaerobic fermenter (15) through the first gas guide pipe (21), the deammoniation tank (23) and the second gas guide pipe (24); S6: Connect the gas collection bag at the gas collection port (17), open the fourth valve (38), start the second AC motor (30), and use the secondary stirring paddle (28) to fully stir the livestock and poultry manure in the anaerobic fermentation tank (15) to produce CH4 through anaerobic fermentation; S7: After the anaerobic fermentation is completed, open the third valve (36) and the fifth valve (39) to discharge the livestock and poultry manure in the aerobic fermentation tank (12) and the anaerobic fermentation tank (15); S8: The aerobic fermenter (12) and the anaerobic fermenter (15) are cleaned by multiple high-pressure nozzles (31).

6. The enzymatic fermentation method for livestock and poultry manure with both CO2 emission reduction and CH4 production functions as described in claim 5, characterized in that, The enzyme preparation is any one of ligninase, cellulase and hemicellulase. The enzymatic hydrolysis time is two to three days. During aerobic fermentation, intermittent ventilation is used, with a ventilation interval of 10 to 30 minutes and a ventilation rate of 0.3 L / (min·kg). The initial pH value is 6.5 to 7.

5.

7. The enzymatic fermentation method for livestock and poultry manure with both CO2 emission reduction and CH4 production functions according to claim 6, characterized in that, When the temperature of the pile in the aerobic fermentation system (2) is close to the ambient temperature, aerobic fermentation is stopped; the initial pH value of livestock and poultry manure in anaerobic fermentation is 6.8 to 7.2, the temperature of anaerobic fermentation is 39°C, and when the daily CH4 content in the gas collection bag is lower than 5% of the total gas content in the gas collection bag for three consecutive days, anaerobic fermentation is stopped.

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