An animal manure composting fermentation tank and fermentation method

Abstract

This invention relates to the technical field of composting, specifically to an animal manure composting fermentation tank and fermentation method. The animal manure composting fermentation tank includes a fermentation tank and a stirring device. The stirring device includes a gantry frame and a stirring shaft. The two ends of the gantry frame are respectively mounted on the top of both sides of the fermentation tank, allowing the gantry frame to move along the length of the fermentation tank. The stirring shaft is movably mounted on the gantry frame, allowing the stirring shaft to move along the gantry frame. Several stirring blades are provided on the outer wall of the stirring shaft. The stirring blades are spirally distributed on the stirring shaft, making the stirring shaft as a whole spiral shaft. This allows the stirring shaft to be used both for mixing manure and auxiliary materials, and also for turning the compost in the later stages of fermentation. Simultaneously, mixing and fermentation both take place in the fermentation tank, reducing space occupation and the need for transferring mixed materials to the fermentation tank, making the fermentation process simpler and more efficient.

Description

Technical Field

[0001] This invention relates to the technical field of composting, and more specifically, to an animal manure composting fermentation tank and fermentation method. Background Technology

[0002] In the production and operation of modern large-scale pig farms, manure treatment is a crucial link in environmental protection and resource recycling. Currently, the most commonly used manure composting technology in the industry is based on the principle of aerobic fermentation. Its standard process includes: first, collecting and transporting the manure produced by the farm from the collection pit; then, mechanically or manually mixing it with high-carbon-content conditioners such as straw, sawdust, and rice husks; and finally, putting the mixture into a fermentation tank or composting trough for aerobic fermentation. During fermentation, it is necessary to maintain the oxygen content within the compost pile through regular turning or forced ventilation to ensure the normal metabolic activities of aerobic microorganisms.

[0003] However, existing manure composting technologies face numerous technical bottlenecks and operational challenges in practical applications: First, in the material transfer stage, the manure in the collection tank needs to be transferred to the mixing station multiple times. This repetitive material transfer not only increases equipment investment and energy consumption but also significantly raises labor costs. Second, in the material mixing stage, the lack of dedicated and efficient mixing equipment makes the uniform mixing process of manure and conditioning agents extremely time-consuming and labor-intensive, seriously affecting the overall treatment efficiency. Third, the entire treatment process requires the configuration of various specialized equipment, including transfer equipment, mixing equipment, and turning equipment, which leads to a significant increase in system complexity and investment costs.

[0004] These technical shortcomings severely restrict the promotion and application of manure composting technology in small and medium-sized farms, and also affect overall treatment efficiency and economic benefits. Therefore, there is an urgent need to develop an innovative manure treatment technology that is highly integrated and easy to operate, in order to solve the technical problems of existing technologies, such as difficulties in material transfer, uneven mixing, and complex equipment, thereby promoting the advancement of livestock waste resource utilization technology. Summary of the Invention

[0005] The purpose of this invention is to provide an animal manure composting fermentation tank and fermentation method, which can facilitate the fermentation process and improve processing efficiency.

[0006] The embodiments of the present invention are achieved through the following technical solutions: An animal manure composting fermentation tank includes a fermentation tank and a stirring device; the stirring device includes a gantry frame and a stirring shaft; the two ends of the gantry frame are respectively mounted on the top of both sides of the fermentation tank, so that the gantry frame can move along the length of the fermentation tank; the stirring shaft is movably mounted on the gantry frame, so that the stirring shaft can move along the gantry frame; a plurality of stirring blades are provided on the outer wall of the stirring shaft; the plurality of stirring blades are spirally distributed on the stirring shaft, so that the stirring shaft as a whole is spiral shaft.

[0007] Furthermore, a manure collection tank is provided on one side of the fermentation tank; it also includes a manure pumping device installed on the gantry frame; the manure pumping device includes a suction pump and two suction pipes connected to both ends of the suction pump; one suction pipe is connected to the manure collection tank, and the other suction pipe is connected to the stirring shaft, so that the manure liquid in the manure collection tank is pumped to the stirring shaft.

[0008] Furthermore, the gantry is also equipped with an air supply device; the air supply device includes an air supply pump and an exhaust pipe connected to the air supply pump; the exhaust pipe is inserted into the septic tank and located on one side of the suction pipe.

[0009] Furthermore, the stirring shaft is a hollow tube; the tube wall of the stirring shaft is provided with several vent holes connecting the inside and outside; the air supply pump is also provided with an exhaust pipe connecting the inside of the stirring shaft.

[0010] Furthermore, the stirring shaft is also provided with an angle adjustment mechanism; the angle adjustment mechanism includes a lifting rod and an adjusting component; the lifting rod is vertically and flexibly disposed inside the stirring shaft; the adjusting component includes an inner ring, an outer ring, and a connecting rod connecting the two; the inner ring is disposed inside the stirring shaft and threadedly connected to the outside of the lifting rod; the outer ring is sleeved on the outside of the stirring shaft; the stirring shaft is provided with a strip-shaped hole for the connecting rod to pass through; the length direction of the strip-shaped hole is arranged along the circumference of the stirring shaft; the stirring blade is provided with a rotating shaft and a swing rod arranged perpendicular to the rotating shaft; the rotating shaft is rotatably inserted through the stirring shaft; the lifting rod, in conjunction with the end of each swing rod, is provided with two vertically distributed drive plates; the end of the swing rod is located between the two drive plates.

[0011] Furthermore, it also includes a plurality of nozzles; the plurality of nozzles are arranged around the top end of the stirring shaft.

[0012] Furthermore, a venting slip ring is provided at the top of the stirring shaft.

[0013] Furthermore, a sealing gasket is provided between the inner wall of the outer ring and the outer wall of the stirring shaft.

[0014] A fermentation method includes the following steps; S1: Place the auxiliary materials in the fermentation tank; S2: Adjust the stirring blades to a 30° angle with the horizontal plane, and adjust the stirring shaft speed to 120 rpm; the suction pump draws in the sewage and sprays it onto the stirring shaft, while the stirring shaft mixes the auxiliary materials. S3: Repeat step S2 while moving the stirring shaft inside the fermentation tank until the mixture is evenly mixed; S4: Periodically move and rotate the stirring shaft to turn the pile until fermentation is complete.

[0015] Furthermore, in step S4, when turning the pile, the stirring blades are adjusted to an angle of 15° with the horizontal plane, and the stirring shaft speed is adjusted to 30 revolutions per minute; at the same time, the air supply pump circulates air into the stirring shaft.

[0016] The technical solutions of the embodiments of the present invention have at least the following advantages and beneficial effects: The animal manure composting fermentation tank of this invention is movable along the fermentation tank via a gantry frame, and the stirring shaft moves along the gantry frame, allowing the stirring shaft to reach any position inside the fermentation tank for stirring or turning at each location. Several stirring blades on the stirring shaft cause the material to tumble up and down during the shaft's rotation, thus achieving the purpose of stirring and turning. This allows the stirring shaft to be used not only for mixing manure with auxiliary materials but also for turning the material in the later stages of fermentation. Furthermore, both stirring and fermentation take place within the fermentation tank, reducing space requirements and the need for transferring mixed materials to the fermentation tank, making the fermentation process simpler and more efficient.

[0017] Placing the septic tank on one side of the fermentation tank and installing a septic pumping device allows for the simultaneous addition of septic liquid during material mixing, simplifying operation and reducing the need to transfer septic liquid from the septic tank to the fermentation tank. An air supply device introduces air into the septic liquid before pumping, causing the solid sludge settled at the bottom to diffuse into the liquid under the impact of the airflow. This ensures the sludge is evenly distributed within the septic liquid, further guaranteeing that the pumped septic liquid is a homogeneous mixture of sludge and sludge, thus ensuring uniform mixing.

[0018] The stirring shaft is equipped with an angle adjustment mechanism, allowing the angle of the stirring blades to be adjusted. During mixing, the angle between the stirring blades and the horizontal plane can be adjusted to approximately 30 degrees. At this angle, the rotation of the stirring shaft provides an upward force to the material, causing it to be thrown upwards and then fall back down. This process promotes more even mixing. During later turning processes, the angle of the stirring blades can be increased to facilitate turning. Turning can also be performed with the stirring blades at a smaller angle. Simultaneously, slowing down the rotation speed of the stirring shaft ensures that the stirring blades only loosen the piled material without scattering it. This allows the loosened material to be piled up as is, without disrupting its original state. This prevents the heat generated during fermentation from dissipating during turning. Furthermore, an air pump and several vents on the stirring shaft introduce oxygen or air into the loosened material, supplying oxygen without sacrificing the internal temperature. This turning method neither affects the internal temperature of the material nor fails to achieve the goal of oxygen supply, thereby improving fermentation efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the animal manure composting and fermentation tank of the present invention.

[0020] Figure 2 This is a schematic diagram of the interior of a septic tank.

[0021] Figure 3 This is a cross-sectional view of an animal manure composting and fermentation tank.

[0022] Figure 4 for Figure 2 Enlarged view of point a in the middle.

[0023] Figure 5 This is a schematic diagram of the stirring shaft.

[0024] Figure 6 This is a schematic diagram showing the connection between the stirring shaft and the lifting rod.

[0025] Attached reference numerals: 1-fermentation tank, 2-manure collection tank, 3-gantry frame, 4-mixing shaft, 5-mixing blade, 6-suction pump, 7-suction pipe, 8-air supply pump, 9-exhaust pipe, 10-ventilation hole, 11-lifting rod, 12-inner ring, 13-outer ring, 14-connecting rod, 15-strip hole, 16-swinging rod, 17-drive plate, 18-nozzle, 19-ventilation slip ring, 20-track, 21-rotating shaft, 22-moving mechanism. Detailed Implementation

[0026] like Figures 1-6As shown, this embodiment provides an animal manure composting fermentation tank, including a fermentation tank 1 and a stirring device. The fermentation tank 1 is a common fermentation container, typically a pit-shaped or trough-shaped structure built on the ground. Its floor is a concrete structure, and the sides are brick walls. The size of the fermentation tank 1 is determined according to the scale of the pig farm and is used to ferment the manure produced daily by the pig farm. The fermentation process generally involves mixing the manure with high-carbon materials such as straw, rice husks, and sawdust, along with the high-nitrogen manure, to adjust the carbon-to-nitrogen ratio. The materials are then stacked for fermentation. During the fermentation process, the pile needs to be turned regularly to ensure sufficient oxygen inside the material for aerobic fermentation, thereby producing odorless organic fertilizer.

[0027] The stirring device includes a gantry frame 3 and a stirring shaft 4. The two ends of the gantry frame 3 are respectively mounted on the top of opposite sides of the fermentation tank 1, allowing the gantry frame 3 to move along the length of the fermentation tank 1. The movement of the gantry frame 3 relative to the fermentation tank 1 follows the same principle as that of a common gantry crane, and will not be described further in this embodiment. To facilitate the movement of the gantry frame 3, tracks 20 are generally provided on the top of both sides of the fermentation tank 1. The stirring shaft 4 is movably mounted on the gantry frame 3, allowing it to move along the gantry frame 3. Specifically, a rack and a slide rail can be installed along the length of the gantry frame 3. A moving mechanism 22 is provided corresponding to the slide rail and rack. The moving mechanism 22 contains a motor and gears, with the gears meshing with the rack on the gantry frame 3. When the motor rotates, it drives the moving mechanism 22 to move along the length of the gantry frame 3. A slider that cooperates with the slide rail is provided at the bottom of the moving mechanism 22, allowing the moving mechanism to move along the slide rail under the drive of the rack and gear. The stirring shaft 4 is rotatably mounted on the moving mechanism 22, allowing the stirring shaft 4 to move with the moving mechanism 22. The moving mechanism 22 also houses a motor that drives the stirring shaft 4 to rotate. The principles governing the movement of the moving mechanism 22 relative to the gantry 3 and the rotation of the stirring shaft 4 are existing technologies and will not be elaborated upon in this embodiment.

[0028] Several stirring blades 5 are provided on the outer wall of the stirring shaft 4. For example... Figure 3 As shown, several stirring blades 5 are spirally distributed on the stirring shaft 4, making the stirring shaft 4 as a whole spiral shaft. When the stirring shaft 4 rotates, the stirring blades 5 apply an upward component force to the material, causing the material to be thrown upward and then fall down under the action of the stirring blades 5.

[0029] The animal manure composting fermentation tank of this invention is movable along the fermentation tank 1 via a gantry frame 3, and the stirring shaft 4 moves along the gantry frame 3, allowing the stirring shaft 4 to reach any position inside the fermentation tank 1 for stirring or turning at various locations. Several stirring blades 5 on the stirring shaft 4 can drive the material up and down during the rotation of the stirring shaft 4, thereby achieving the purpose of stirring and turning. This allows the stirring shaft 4 to be used not only for mixing manure and auxiliary materials, but also for turning the material in the later stages of fermentation. Simultaneously, stirring, mixing, and fermentation all take place in the fermentation tank 1, reducing space occupation and the need for transferring mixed materials to the fermentation tank 1, making the fermentation process simpler and more efficient.

[0030] In this embodiment, a manure collection tank 2 is provided on one side of the fermentation tank 1. It also includes a manure pumping device mounted on the gantry frame 3. For example... Figure 4 As shown, the septic tank pumping device includes a suction pump 6 and two suction pipes 7 connected to both ends of the suction pump 6. One suction pipe 7 is connected to the septic tank 2, and the other suction pipe 7 is connected to the stirring shaft 4, so that the septic liquid in the septic tank 2 is sucked to the stirring shaft 4. The suction pipe 7 is set as a flexible hose, and the length of the suction pipe 7 is greater than or equal to the length of the gantry 3, so that the suction pipe 7 can be easily changed in position as the moving mechanism 22 moves.

[0031] Setting the manure collection tank 2 on one side of the fermentation tank 1 and installing a manure pumping device allows for the simultaneous addition of manure liquid during the material mixing process, which is convenient for operation and also reduces the steps of transferring manure liquid from the manure collection tank 2 to the fermentation tank 1.

[0032] In this embodiment, the gantry 3 is also equipped with an air supply device. For example... Figure 4 As shown, the air supply device includes an air supply pump 8 and an exhaust pipe 9 connected to the air supply pump 8. The exhaust pipe 9 is inserted into the septic tank 2 and located on one side of the suction pipe 7. The exhaust pipe 9 is also made of flexible hose, and the length of the exhaust pipe 9 is greater than or equal to the length of the gantry 3, so that the exhaust pipe 9 can be easily changed in position as the moving mechanism 22 moves.

[0033] An air supply device is installed so that air is first introduced into the sewage slurry during suction. This causes the solid fecal residue that has settled at the bottom to diffuse into the liquid sewage under the impact of the airflow. This ensures that the fecal residue is evenly distributed in the sewage slurry, further making the suctioned sewage a liquid with uniform fecal residue, thus guaranteeing the uniformity of the mixture.

[0034] In this embodiment, the stirring shaft 4 is a hollow tube. The tube wall of the stirring shaft 4 has several ventilation holes 10 connecting the inside and outside. The air supply pump 8 is also equipped with an exhaust pipe 9 connecting to the inside of the stirring shaft 4. This allows air to be supplied to the stirring shaft 4 during stirring or turning, and the airflow is then discharged through the ventilation holes 10. During stirring or turning, the airflow ejected from the ventilation holes 10 intensifies the flow of the material, thus facilitating mixing. Simultaneously, the stirring shaft 4 can be slowly rotated to turn the material. In this case, the material is merely agitated to a loose state. Simultaneous introduction of oxygen or air ensures the oxygen content inside the material. This prevents the loss of high internal temperature during the oxygen supply process, thereby improving fermentation efficiency.

[0035] In this embodiment, the stirring shaft 4 is also equipped with an angle adjustment mechanism. The angle adjustment mechanism includes a lifting rod 11 and an adjusting component. Figure 5 and Figure 6 As shown, the lifting rod 11 is vertically adjustable and is located inside the stirring shaft 4. The adjusting component includes an inner ring 12, an outer ring 13, and a connecting rod 14 connecting the two, so that the inner ring 12 and outer ring 13 are integrated. The inner ring 12 is located inside the stirring shaft 4 and threadedly connected to the outside of the lifting rod 11. The outer ring 13 is fitted onto the outside of the stirring shaft 4. The stirring shaft 4 has a slotted hole 15 through which the connecting rod 14 passes. The length of the slotted hole 15 is along the circumference of the stirring shaft 4. This allows the connecting rod 14 to move within the slotted hole 15, thereby allowing the inner ring 12 to rotate at a certain angle. This rotation angle allows the lifting rod 11 to rise or fall to a certain height under the rotation of the inner ring 12. The stirring blade 5 is connected to the stirring shaft 4 via a rotating shaft 21 and a swing rod 16. A rotating shaft 21 is rotatably mounted on a stirring shaft 4. A stirring blade 5 is fixed to one end of the rotating shaft 21. A swing rod 16 is preferably an arc-shaped rod. One end of the swing rod 16 is vertically fixed to the end of the rotating shaft 21 away from the stirring blade 5, and the swing rod 16 is located inside the stirring shaft 4. A lifting rod 11, in conjunction with the end of each swing rod 16, has two vertically distributed drive blades 17 fixedly mounted. The end of the swing rod 16 (away from the rotating shaft 21) is sandwiched between the two drive blades 17. When the outer ring 13 is rotated, causing the lifting rod 11 to rise and fall, the paired drive blades 17 rise and fall with the lifting rod 11, which in turn causes the end of the swing rod 16 to rise and fall. The rise and fall of the swing rod 16 then causes the rotating shaft 21 to rotate, further causing the stirring blade 5 to rotate, thereby adjusting the angle of the stirring blade 5. In summary, adjusting the angle of the stirring blade 5 can be achieved simply by rotating the outer ring 13.

[0036] The stirring shaft 4 is equipped with an angle adjustment mechanism, allowing the angle of the stirring blades 5 to be adjusted. During mixing, the angle between the stirring blades 5 and the horizontal plane can be adjusted to approximately 30 degrees. At this angle, the rotation of the stirring shaft 4 and the stirring blades 5 provides a greater upward force to the material, causing it to be thrown upwards and then fall back down. This process is more conducive to uniform mixing. During the later turning process, the angle of the stirring blades 5 can be increased to facilitate turning. Turning can also be performed with the stirring blades 5 at a small angle. Simultaneously, the rotation speed of the stirring shaft 4 is slowed down, ensuring that the stirring blades 5 only loosen the piled material without scattering it. This allows the loosened material to be piled up as is, without disrupting its original state. This prevents the heat generated during fermentation from dissipating during turning. Furthermore, the air pump 8 and several vents 10 on the stirring shaft 4 introduce oxygen or air into the loosened material, thus supplying oxygen without losing the internal temperature of the material. This turning method neither affects the internal temperature of the material nor fails to achieve the purpose of oxygen supply, thereby improving fermentation efficiency. To prevent air from leaking through the slot 15, a sealing gasket is provided between the inner wall of the outer ring 13 and the outer wall of the stirring shaft 4.

[0037] This embodiment also includes a plurality of nozzles 18. For example... Figure 3 As shown, several nozzles 18 are connected to the air extraction pipe 7 through a dispersion plate to spray the extracted manure liquid into the fermentation tank 1. The nozzles 18 are preferably evenly arranged around the top of the stirring shaft 4, preferably fixed to the periphery of the moving mechanism 22, and preferably arranged around the outer circumference of the stirring shaft 4. Then, the nozzles 18 spray manure liquid downward into the fermentation tank 1, so that the manure liquid is evenly sprayed onto the material raised around the stirring shaft 4.

[0038] In this embodiment, a venting slip ring 19 is provided at the top of the stirring shaft 4. The venting slip ring 19 is coaxially arranged with the stirring shaft 4 and is connected to the supply pump 8 through the exhaust pipe 9. Thus, the airflow provided by the supply pump 8 can be stably input into the stirring shaft 4 through the venting slip ring 19.

[0039] This embodiment also provides a fermentation method, including the following steps.

[0040] S1: Place the auxiliary materials in fermentation tank 1.

[0041] S2: Adjust the stirring blade 5 so that its right side is above the horizontal plane and forms a 30° angle with the horizontal plane. Adjust the rotation speed of the stirring shaft 4 to 120 rpm. The suction pump 6 draws in the sewage and sprays it onto the stirring shaft 4, which then mixes the auxiliary materials. The 30° angle of the stirring blade 5 provides a greater upward force to the materials. The 120 rpm rotation speed allows the materials to be effectively lifted upwards by the stirring blade 5, thereby accelerating the mixing of the materials.

[0042] S3: Repeat step S2 while the stirring shaft 4 moves within the fermentation tank 1 until the mixture is evenly stirred.

[0043] S4: Periodically move and rotate the stirring shaft 4 to turn the pile until fermentation is complete.

[0044] This method allows for the rapid completion of material mixing, palletizing, and turning.

[0045] In this embodiment, during step S4, the stirring blade 5 is adjusted to a 15° angle with the horizontal plane, and the stirring shaft 4 is rotated at 30 revolutions per minute. Simultaneously, the air pump 8 supplies air to the stirring shaft 4. The 15° angle of the stirring blade 5 provides a small upward force to the material. The slow rotation speed of 30 revolutions per minute effectively agitates and loosens the material while preventing it from being lifted upwards by the stirring blade 5. This ensures that only the material is agitated and loosened, and oxygen is supplied, without disrupting the original stacking structure or the internal temperature of the material.

Claims

1. An animal manure composting and fermentation tank, characterized in that: The device includes a fermentation tank and a stirring device; the stirring device includes a gantry frame and a stirring shaft; the two ends of the gantry frame are respectively mounted on the top of both sides of the fermentation tank so that the gantry frame can move along the length of the fermentation tank; the stirring shaft is movably mounted on the gantry frame so that the stirring shaft can move along the gantry frame; the outer wall of the stirring shaft is provided with a plurality of stirring blades; the plurality of stirring blades are spirally distributed on the stirring shaft so that the stirring shaft as a whole is spiral shaft.

2. The animal manure composting fermentation tank according to claim 1, characterized in that: A manure collection tank is provided on one side of the fermentation tank; it also includes a manure pumping device installed on the gantry frame; the manure pumping device includes a suction pump and two suction pipes connected to both ends of the suction pump; one suction pipe is connected to the manure collection tank and the other suction pipe is connected to the stirring shaft, so that the manure liquid in the manure collection tank is pumped to the stirring shaft.

3. The animal manure composting fermentation tank according to claim 2, characterized in that: The gantry is also equipped with an air supply device; the air supply device includes an air supply pump and an exhaust pipe connected to the air supply pump; the exhaust pipe is inserted into the septic tank and located on one side of the suction pipe.

4. The animal manure composting fermentation tank according to claim 3, characterized in that: The stirring shaft is a hollow tube; the tube wall of the stirring shaft is provided with several vent holes that connect the inside and outside; the air supply pump is also provided with an exhaust pipe that connects to the inside of the stirring shaft.

5. The animal manure composting fermentation tank according to claim 4, characterized in that: The stirring shaft is also provided with an angle adjustment mechanism; the angle adjustment mechanism includes a lifting rod and an adjusting component; the lifting rod is movably disposed inside the stirring shaft; the adjusting component includes an inner ring, an outer ring, and a connecting rod connecting the two; the inner ring is disposed inside the stirring shaft and threadedly connected to the outside of the lifting rod; the outer ring is sleeved on the outside of the stirring shaft; the stirring shaft is provided with a strip-shaped hole for the connecting rod to pass through; the length direction of the strip-shaped hole is arranged along the circumference of the stirring shaft; the stirring blade is provided with a rotating shaft and a swing rod arranged perpendicular to the rotating shaft; the rotating shaft is rotatably disposed through the stirring shaft; the lifting rod, in conjunction with the end of each swing rod, is provided with two vertically distributed drive plates; the end of the swing rod is located between the two drive plates.

6. The animal manure composting fermentation tank according to claim 5, characterized in that: It also includes a plurality of nozzles; the plurality of nozzles are arranged around the top end of the stirring shaft.

7. The animal manure composting fermentation tank according to claim 6, characterized in that: A venting slip ring is provided at the top of the stirring shaft.

8. The animal manure composting fermentation tank according to claim 7, characterized in that: A sealing gasket is provided between the inner wall of the outer ring and the outer wall of the stirring shaft.

9. A fermentation method, characterized in that: Includes the following steps; S1: Place the auxiliary materials in the fermentation tank; S2: Adjust the stirring blades so that the right side of the stirring blades is on the horizontal plane and the angle between the stirring blades and the horizontal plane is 30°. Adjust the stirring shaft speed to 120 revolutions per minute. The suction pump draws in the sewage and sprays it onto the stirring shaft, while the stirring shaft stirs the auxiliary materials. S3: Repeat step S2 while moving the stirring shaft inside the fermentation tank until the mixture is evenly mixed; S4: Periodically move and rotate the stirring shaft to turn the pile until fermentation is complete.

10. The fermentation method according to claim 9, characterized in that: In step S4, when turning the pile, the stirring blades are adjusted to an angle of 15° with the horizontal plane, and the stirring shaft speed is adjusted to 30 revolutions per minute; at the same time, the air pump supplies air into the stirring shaft.

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