Rural aquaculture wastewater fermentation system

Abstract

The present invention relates to a rural aquaculture wastewater fermentation system, which belongs to the field of wastewater treatment equipment. The system comprises a solid-liquid separation device and a fermentation tank. A composting fermentation chamber is provided above the fermentation tank, and the composting fermentation chamber is provided with a feed inlet and a discharge port. The liquid outlet of the solid-liquid separation device is connected to the fermentation tank, and the solid outlet of the solid-liquid separation device is connected to the feed inlet. A heating mechanism is provided in the fermentation tank, and a heat exchange pipe is provided in the composting fermentation chamber. The inlet of the heat exchange pipe is connected to the liquid outlet of the solid-liquid separation device through a flow control valve, and the outlet of the heat exchange pipe is connected to the fermentation tank. The temperature sensor and the flow control valve are both connected to a controller. In the present invention, after the rural aquaculture wastewater is subjected to solid-liquid separation, the wastewater is passed into the fermentation tank for anaerobic fermentation to produce biogas. Solid feces, straw residues, etc. enter the composting fermentation chamber. After composting and fermentation, organic fertilizer can be obtained, thereby achieving simultaneous fermentation of wastewater and solid waste.

Description

Technical Field

[0001] The invention belongs to the field of wastewater treatment equipment, in particular to a rural aquaculture wastewater fermentation system. Background Art

[0002] Rural breeding wastewater contains a large amount of livestock manure, urine, straw residue, etc., which are rich in organic matter and nutrients such as nitrogen and phosphorus. If discharged directly, it will seriously pollute the surrounding environment and lead to waste of resources.

[0003] Patent application number CN202210282547.X discloses a livestock and poultry wastewater fermentation and sterilization system, which includes an anaerobic fermentation module, a chemical sterilization module, a solid-liquid separation module, a physical sterilization module, a detection module, and a central control module. After the wastewater is separated by the solid-liquid separation module, the upper layer of wastewater is fermented. The system only ferments the wastewater and does not ferment the separated solid impurities. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a rural aquaculture wastewater fermentation system, which can not only ferment the wastewater, but also ferment the solid impurities in the wastewater at the same time.

[0005] In order to solve the above problems, the technical solution adopted by the present invention is: a rural aquaculture wastewater fermentation system, including a solid-liquid separation device and a fermentation tank,

[0006] A compost fermentation chamber is provided above the fermentation tank, one end of the compost fermentation chamber is provided with a feed port, the other end is provided with a discharge port, and a feeding mechanism is provided in the compost fermentation chamber; the liquid outlet of the solid-liquid separation device is connected to the fermentation tank, and the solid outlet of the solid-liquid separation device is connected to the feed port;

[0007] A heating mechanism is provided in the fermentation tank, a plurality of heat exchange tubes are provided in the compost fermentation chamber, a temperature sensor is provided on the outer wall of the heat exchange tube, the inlet of the heat exchange tube is connected to the liquid outlet of the solid-liquid separation equipment through a flow control valve, the outlet of the heat exchange tube is connected to the fermentation tank, and the inlet of the heat exchange tube is higher than the outlet of the heat exchange tube; the temperature sensor and the flow control valve are both connected to a controller.

[0008] Furthermore, the solid-liquid separation equipment includes a horizontally arranged separation cylinder, a feed bin is provided on the top of one end of the separation cylinder, and a dehydration cylinder is provided at the other end, a plurality of drainage holes are provided on the cylinder walls of the dehydration cylinder and the separation cylinder, the solid outlet is provided at the end of the dehydration cylinder, and the inner diameter of the dehydration cylinder gradually decreases in the direction toward the solid outlet; a liquid collecting tank is provided below the dehydration cylinder and the separation cylinder, the liquid collecting tank is connected to the fermentation tank through a liquid infusion pipe, and a flow control valve is provided at the bottom of the liquid collecting tank; a conveying shaft is provided inside the separation cylinder, a spiral conveying sheet is fixedly provided on the outer wall of the conveying shaft, and a conveying motor is connected to one end of the conveying shaft.

[0009] Furthermore, an inclined conveying trough is provided below the solid outlet, the lower end of the conveying trough is connected to the feed end of the compost fermentation chamber, a scraper is provided inside the feed end of the compost fermentation chamber, and the scraper is connected to a scraping drive mechanism that drives the scraper to reciprocate linear motion.

[0010] Furthermore, the feed end of the compost fermentation chamber is provided with two support rails and a material height detection mechanism, the support rail is provided with a slide that slides with the support rail, the scraper drive mechanism includes a screw and a scraper motor, the screw passes through the slide and is threaded with the slide, and one end of the screw is connected to the scraper motor; both ends of the scraper are fixed with mounting shafts, the mounting shafts are rotatably mounted on the slide, and the mounting shafts are connected to the adjustment motor; a cavity is provided in the scraper, and a plurality of feeding holes connected to the cavity are provided on one side of the scraper, the cavity is connected with a hose, and the hose is connected to the lime feeding mechanism and the air supply mechanism in turn; the lime feeding mechanism, the air supply mechanism, the material height detection mechanism, the scraper motor and the adjustment motor are all connected to the controller.

[0011] The top of the feed container is installed in the form of a lifting plate, and the bottom of the feeding container is installed in the form of a lifting plate. The lifting plate has a plurality of lifting plates, each of which has a plurality of lifting plates extending therefrom. The lifting plate has a plurality of lifting plates extending therefrom. The lifting plate has a plurality of lifting plates extending therefrom.

[0012] Furthermore, the bottom wall of the compost fermentation chamber is provided with a drainage trough, and the notch of the drainage trough is provided with a filter screen.

[0013] Furthermore, a sealing member is provided in the fermentation tank.

[0014] Furthermore, an aeration pipe is provided at the bottom of the fermentation tank, and an exhaust fan is provided in the fermentation tank. The exhaust fan is connected to an exhaust pipe and a return air pipe. Valves are provided on the exhaust pipe and the return air pipe, and the return air pipe is connected to the aeration pipe.

[0015] The beneficial effects of the present invention are as follows: in the present invention, after the rural breeding wastewater is separated into solid and liquid, the wastewater is passed into a fermentation tank for anaerobic fermentation to produce biogas; and solid feces, straw residues, etc. enter the composting fermentation chamber, and after composting and fermentation, organic fertilizer can be obtained, thereby realizing the simultaneous fermentation of wastewater and solid waste.

[0016] The present invention arranges the compost fermentation chamber above the fermentation tank, which fully utilizes the space and improves the utilization rate of the land.

[0017] During composting, the optimal fermentation temperature is typically between 50 and 70 degrees Celsius. However, as fermentation progresses, the temperature gradually rises. Excessively high temperatures can affect the decomposition of organic matter. Therefore, traditional composting requires multiple turnings to properly cool the compost and improve fermentation uniformity. However, turning the compost is labor-intensive and cumbersome. The optimal fermentation temperature in the fermentation tank is around 35 degrees Celsius, requiring a heating mechanism to maintain the temperature, which consumes a certain amount of energy. In the present invention, heat exchange tubes are embedded in the solid fermentation pile, and a temperature sensor monitors the temperature within the fermentation pile in real time. When the temperature is too high, a flow control valve is opened, and wastewater separated by the solid-liquid separation equipment is transported to the heat exchange tubes. The wastewater, at a lower temperature, exchanges heat with the fermentation pile, raising the temperature of the wastewater and allowing it to flow into the fermentation tank while simultaneously cooling the temperature of the fermentation pile. The present invention effectively maintains the temperature of the fermentation pile, preventing it from overheating. It also eliminates the need for turning the compost, reduces labor intensity, and utilizes the heat generated by the fermentation pile to heat the wastewater, reducing the energy consumption of the heating mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic front cross-sectional view of the present invention;

[0019] Figure 2 yes Figure 1 A magnified schematic diagram of part A;

[0020] Figure 3 yes Figure 2 Schematic diagram of the middle BB;

[0021] Figure 4 is a schematic cross-sectional view of a scraper;

[0022] Figure 5 yes Figure 1 Schematic diagram of CC;

[0023] Figure 1: 1—fermentation tank; 2—composting chamber; 3—heating mechanism; 4—flow control valve; 5—heat exchange tube; 6—temperature sensor; 7—controller; 8—separation drum; 9—feeding bin; 10—liquid collecting tank; 11—conveyor shaft; 12—screw conveyor blade; 13—conveyor motor; 14—dehydration drum; 15—conveyor trough; 16—scraper; 17—scraper driving mechanism; 18—support rail; 19—slide; 20—mounting shaft; 21—adjusting motor ; 22—cavity; 23—feeding hole; 24—hose; 25—air supply mechanism; 26—lime feeding mechanism; 27—material height detection mechanism; 28—insulation plate; 29—rotating shaft; 30—feeding motor; 31—guide column; 32—sleeve; 33—lifting plate; 34—lifting mechanism; 35—push plate; 37—drain trough; 38—filter; 39—seal; 40—aeration pipe; 41—exhaust fan; 42—exhaust pipe; 43—return air pipe. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings and examples.

[0025] The rural aquaculture wastewater fermentation system of the present invention is as follows: Figures 1 to 5 As shown, it includes solid-liquid separation equipment and a fermentation tank 1.

[0026] Among them, the solid-liquid separation equipment is used to separate the solid and liquid of wastewater to obtain solid matter and wastewater. The solid matter is mainly livestock manure and straw residue, which can be composted and fermented.

[0027] The fermentation tank 1 is used to perform anaerobic fermentation on the wastewater after solid-liquid separation to obtain biogas and liquid fertilizer. A composting fermentation chamber 2 is provided above the fermentation tank 1. The composting fermentation chamber 2 is used to perform composting fermentation on the solid matter after solid-liquid separation to obtain organic fertilizer. A feed port is provided at one end of the composting fermentation chamber 2 for passing the solid matter into the composting fermentation chamber 2, and a discharge port is provided at the other end for discharging the fermented organic fertilizer. A feeding mechanism is provided in the composting fermentation chamber 2 for pushing the fermentation pile toward the discharge port. The liquid outlet of the solid-liquid separation equipment is connected to the fermentation tank 1, and the solid outlet of the solid-liquid separation equipment is connected to the feed port. After the original wastewater from rural aquaculture is separated by the solid-liquid separation equipment, the solid matter directly enters the composting fermentation chamber 2, and the wastewater directly enters the fermentation tank 1.

[0028] A seal 39 is provided in the fermentation tank 1. The seal 39 can be a sealing plate to seal the fermentation tank 1 to prevent air from entering and affecting the anaerobic environment of the fermentation tank. At the same time, it prevents biogas from leaking out and causing waste and safety accidents. The biogas in the fermentation tank 1 can be discharged for use through the exhaust mechanism. Specifically, an exhaust fan 41 is provided in the fermentation tank 1, and the exhaust fan 41 can be used to discharge the biogas. Since anaerobic fermentation is carried out in the fermentation tank 1, the water body remains still and has little fluctuation. The biogas produced by anaerobic bacteria in the water body is difficult to be discharged in time. Therefore, the present invention is provided with an aeration pipe 40 at the bottom of the fermentation tank 1. The exhaust fan 41 is connected to an exhaust pipe 42 and an air return pipe 43. Valves are provided on the exhaust pipe 42 and the air return pipe 43, and the air return pipe 43 is connected to the aeration pipe 40. After the exhaust fan 41 is started, the biogas in the fermentation tank 1 can be transported to the exhaust pipe 42 and the return pipe 43. The exhaust pipe 42 is connected to a gas-using facility such as a storage tank or a stove, and can transport the biogas to the storage tank or stove for storage or use. The return pipe 43 transports part of the biogas to the aeration pipe 40. The aeration pipe 40 is provided with multiple aeration holes. The biogas enters the water through the aeration holes and then flows upward, stirring the water body and promoting the rapid discharge of the biogas generated in the water body. In addition, to facilitate the growth of anaerobic bacteria, a polyurethane sponge filler can be set in the fermentation tank 1, and anaerobic bacteria can adhere to the polyurethane sponge filler.

[0029] A drainage pipe can be provided at the outlet of fermentation tank 1 to discharge the fermented wastewater, which can be used as liquid fertilizer. Fermentation tank 1 regularly discharges biogas residue, which can be added to the compost in composting chamber 2 to adjust the compost's moisture content and carbon-nitrogen ratio, further utilizing the rich nitrogen source in the biogas residue to improve the fertility of the compost product. The present invention utilizes a closed-loop recycling process to fully utilize the resources in rural aquaculture wastewater and achieve waste-free treatment.

[0030] The present invention arranges the compost fermentation chamber 2 above the fermentation tank 1, which fully utilizes the space, reduces the overall floor area, and improves the utilization rate of the land.

[0031] In the fermentation tank 1, the optimal fermentation temperature is about 35 degrees Celsius. However, under natural conditions, the temperature of wastewater is difficult to reach 35 degrees Celsius. Therefore, a heating mechanism 3 is provided in the fermentation tank 1. The heating mechanism 3 can be any of the existing electric heating mechanisms. In order to accurately control the temperature in the fermentation tank 1, a temperature detection element can also be provided in the fermentation tank 1. The temperature detection element and the heating mechanism 3 are both connected to a controller 7. The controller 7 automatically controls the operation of the heating mechanism 3 based on the detection results of the temperature detection element, so that the temperature in the fermentation tank 1 is stably maintained within a set range.

[0032] During the composting process, the optimal fermentation temperature is usually between 50 and 70 degrees Celsius. As fermentation progresses, the temperature inside the fermentation pile will gradually rise to over 70 degrees Celsius. Excessive temperature will reduce the decomposition efficiency of organic matter. Therefore, traditional composting requires multiple turnings to properly cool the pile and improve fermentation uniformity. However, turning the pile is relatively troublesome and labor-intensive. In the present invention, when the internal temperature of the fermentation pile is too high, in order to reduce the fermentation temperature, a plurality of heat exchange tubes 5 are provided in the composting fermentation chamber 2. The heat exchange tubes 5 can be made of stainless steel tubes. During composting, the heat exchange tubes 5 are covered by the fermentation pile. The outer wall of the heat exchange tube 5 is provided with a temperature sensor 6, which is used to detect the internal temperature of the fermentation pile. The inlet of the heat exchange tube 5 is connected to the liquid outlet of the solid-liquid separation equipment through a flow control valve 4. The outlet of the heat exchange tube 5 is connected to the fermentation tank 1. The inlet of the heat exchange tube 5 is higher than the outlet of the heat exchange tube 5, so that wastewater can automatically flow along the heat exchange tube 5, without the need to set up power-consuming facilities such as water pumps, thereby reducing the energy consumption of system operation. The temperature sensor 6 and the flow control valve 4 are both connected to the controller 7. The temperature sensor 6 monitors the internal temperature of the fermentation pile in real time and transmits the detection signal to the controller 7. When the temperature value detected by the temperature sensor 6 is higher than the set temperature range, the controller 7 controls the flow control valve 4 to open, and the wastewater separated by the solid-liquid separation equipment can enter the heat exchange tube 5, so that the wastewater with a lower temperature exchanges heat with the fermentation pile, the temperature of the fermentation pile decreases, and the temperature of the wastewater increases. When the temperature of the fermentation pile returns to the set range, the controller 7 controls the flow control valve 4 to close and stops the wastewater from entering the heat exchange tube 5. The present invention can not only control the internal temperature of the fermentation pile more accurately, but also recover the heat generated by the fermentation pile, reducing the energy consumption of the heating mechanism 3. At the same time, there is no need to turn the fermentation pile to cool it down, saving the labor required for turning the pile.

[0033] The solid-liquid separation equipment can adopt various existing filtering and separation equipment. Preferably, the solid-liquid separation equipment of the present invention includes a horizontally arranged separation drum 8, with a feed bin 9 provided at the top of one end of the separation drum 8. Rural aquaculture wastewater can be passed into the separation drum 8 through the feed bin 9. The other end of the separation drum 8 is provided with a dehydration drum 14, which is used to dehydrate the solid matter, reducing the water content of the solid matter to 60% to 70%, which is suitable for composting and fermentation. The dehydration drum 14 can be welded to the separation drum 8. The walls of the dehydration drum 14 and the separation drum 8 are provided with multiple drainage holes. After the wastewater enters the separation drum 8 and the dehydration drum 14, the solid matter remains inside the separation drum 8 and the dehydration drum 14, while the wastewater is discharged through the drainage holes, achieving solid-liquid separation. The solids outlet is provided at the end of the dehydration drum 14. The separation drum 8 is a circular cylinder, and the dehydration drum 14 is a conical cylinder. The inner diameter of the dehydration drum 14 gradually decreases towards the solids outlet. A sump 10 is located below the dehydration drum 14 and the separation drum 8. This sump 10 is connected to the fermentation tank 1 via a liquid infusion pipe. A flow control valve 4 is located at the bottom of the sump 10. Wastewater is discharged through the drainage hole and falls into the sump 10. It is then transported to the fermentation tank 1 via the liquid infusion pipe. When the flow control valve 4 is opened, some wastewater passes through the flow control valve 4 and enters the heat exchange tube 5. A conveying shaft 11 is located inside the separation drum 8. This conveying shaft 11 is coaxial with the separation drum 8. A spiral conveying blade 12 is fixedly mounted on the outer wall of the conveying shaft 11. One end of the conveying shaft 11 is connected to a conveying motor 13. When the conveying motor 13 rotates the conveying shaft 11, it pushes the solid matter inside the separation drum 8 toward the dehydration drum 14. Once the solid matter enters the dehydration drum 14, the gradually decreasing diameter of the inner cavity of the dehydration drum 14 squeezes the solid matter, resulting in gradual dehydration. After dehydration, the solid matter exits the dehydration drum 14 through the solids outlet.

[0034] A dewatering drum 14 and a separation drum 8 are mounted on the ground near the fermentation tank 1. These drums are supported by a frame, ensuring they are at an appropriate height, allowing wastewater from the sump 10 to flow into the fermentation tank 1 under its own weight. An inclined conveyor trough 15 is located below the solids outlet. The lower end of the conveyor trough 15 is connected to the feed end of the composting chamber 2. Solids discharged from the solids outlet fall into the conveyor trough 15 and then slide down the conveyor trough 15 into the interior of the composting chamber 2. To ensure that the solids are evenly distributed on the bottom wall of the feed end of the composting chamber 2, a scraper 16 is installed inside the feed end of the composting chamber 2. This scraper 16 is connected to a scraper drive mechanism 17 that drives the scraper 16 in reciprocating linear motion. The scraper drive mechanism 17 drives the scraper 16 in reciprocating linear motion, and the lower end of the scraper 16 scrapes the solids, ensuring a uniform distribution of the solids across the bottom wall of the composting chamber 2. A plurality of scraping teeth may be provided at the lower end of the scraper 16 to improve the scraping effect.

[0035] The feed end of the composting and fermentation chamber 2 is provided with two support rails 18 and a material height detection mechanism 27. The support rails 18 are provided with a slide 19 that slides with the support rails 18. The scraper drive mechanism 17 includes a screw and a scraper motor. The screw passes through the slide 19 and is threadedly engaged with the slide 19. One end of the screw is connected to the scraper motor. When the scraper motor drives the screw to rotate, the screw can push the slide 19 to move linearly along the support rails 18. The scraper 16 is fixedly provided with a mounting shaft 20 at both ends. The mounting shaft 20 is rotatably mounted on the slide 19. When the slide 19 moves, it can drive the scraper 16 to move synchronously. The mounting shaft 20 is connected to the adjustment motor 21. The adjustment motor 21 can adjust the angle of the scraper 16, so that the scraper 16 can be in a vertical state or in an inclined state with various inclination angles.

[0036] When the solid matter first enters the composting fermentation chamber 2, the thickness of the solid matter is relatively low. At this time, the scraper 16 needs to be in a lower position to scrape the solid matter. As the solid matter accumulates, the thickness of the solid matter gradually increases. The height of the scraper 16 also needs to be appropriately increased to achieve the goal of scraping the solid matter layer by layer flat. In the present invention, the scraper 16 is connected to the adjustment motor 21 through the mounting shaft 20. The adjustment motor 21 can drive the scraper 16 to rotate so that the scraper 16 can be in a vertical state, a horizontal state, and an inclined state. The mounting shaft 20 is at the upper end of the scraper 16. The height of the mounting shaft 20 remains unchanged. When the inclination angle of the scraper 16 is different, the height of the lower end of the scraper 16 is different. Therefore, the inclination angle of the scraper 16 can be adjusted according to the thickness of the solid matter so that the height of the lower end of the scraper 16 is adapted to the thickness of the solid matter, thereby ensuring that the scraper 16 can scrape the surface of the solid matter flat. The material height detection mechanism 27 is used to detect the surface height of the solid material at the feed end of the compost fermentation chamber 2, that is, the thickness of the solid material. Specifically, a laser rangefinder or other equipment can be used. The laser rangefinder can be fixedly installed on the top wall of the compost fermentation chamber 2 to detect the distance from the laser rangefinder to the solid material. The thickness of the solid material can be calculated based on the detection structure.

[0037] After the solid matter is dehydrated in the dehydration drum 14, it is squeezed into a mass, which is not conducive to the entry of air into the interior. After the solid matter is passed into the composting fermentation chamber 2, the scraper 16 is used to scrape the solid matter back and forth, which can break up the solid matter that has gathered into a mass, which is beneficial to increase the oxygen content in the solid matter and thus improve the efficiency of composting fermentation.

[0038] Acidification may occur in the early stages of compost fermentation. In order to adjust the pH of the fermentation pile and accelerate the temperature rise rate in the early stages of fermentation, quicklime can be added to the fermentation pile. The weight of quicklime added is about 2% of the weight of the fermentation pile. A separate quicklime adding mechanism can be used to add quicklime to the fermentation pile, but this will increase the number of equipment. In order to achieve the addition of quicklime and simultaneously reduce the number of equipment inside the compost fermentation chamber 2, the present invention provides a cavity 22 in the scraper 16. One side of the scraper 16 is provided with a plurality of feeding holes 23 connected to the cavity 22. The cavity 22 is connected to a hose 24. The hose 24 is sequentially connected to a lime feeding mechanism 26 and an air supply mechanism 25. The air supply mechanism 25 is connected to the external space of the compost fermentation chamber 2.

[0039] In the present invention, during the process of scraping the solid material layer by layer, after each layer is scraped, the motor 21 is adjusted to rotate the scraper 16 to a horizontal position. At this time, the feeding hole 23 is located at the bottom plate of the scraper 16. Then, the lime feeding mechanism 26 and the air supply mechanism 25 are activated. The lime feeding mechanism 26 feeds powdered quicklime into the hose 24, and the air supply mechanism 25 conveys external air to the hose 24. The flow of air drives the quicklime, causing the quicklime to move, so that the quicklime enters the cavity 22 and then exits the scraper 16 through the various feeding holes 23, and the quicklime falls onto the surface layer of the solid material below. The scraper drive mechanism 17 drives the slide 19 and the scraper 16 to move horizontally and linearly, so that the quicklime powder can be evenly distributed over the entire surface layer of the solid material.

[0040] The lime delivery mechanism 26 can be a quicklime powder storage box and a powder delivery pump connected to the quicklime powder storage box. The air delivery mechanism 25 can be an air pump, a blower, or the like. Since composting is aerobic, a certain oxygen content is required in the fermentation pile. In the present invention, quicklime powder is delivered to the scraper 16 using external air. When quicklime is delivered, external air is also sprayed onto the solid matter, increasing the oxygen content of the solid matter. This also promotes air circulation inside and outside the composting fermentation chamber 2, preventing the accumulation of harmful gases in the composting fermentation chamber 2 and causing safety accidents.

[0041] In the present invention, the lime feeding mechanism 26, the air supply mechanism 25, the material height detection mechanism 27, the scraper motor and the adjustment motor 21 are all connected to the controller 7, and the controller 7 automatically controls the operation of the adjustment motor 21, the scraper motor, the lime feeding mechanism 26 and the air supply mechanism 25.

[0042] The bottom wall of the composting and fermentation chamber 2 is tilted, and the feed port is higher than the discharge port, which helps reduce the resistance to pushing the material. An insulation board 28 is provided within the composting and fermentation chamber 2, parallel to the bottom wall. The insulation board 28, the bottom wall of the composting and fermentation chamber 2, and the side walls of the composting and fermentation chamber 2 form a fermentation chamber. The insulation board 28 can be made of a metal plate, and an insulation layer is provided on the upper surface of the metal plate. The insulation board 28 provides insulation, reduces the temperature difference between the upper surface of the fermentation pile and the interior of the fermentation pile, and improves the uniformity of fermentation.

[0043] The insulation plate 28 is provided with a plurality of strip-shaped holes, the length direction of which is perpendicular to the direction of movement of the material. The feeding mechanism includes a rotating shaft 29 disposed in each strip-shaped hole. One end of the rotating shaft 29 is connected to a feeding motor 30, which can drive the rotating shaft 29 to rotate. Guide posts 31 perpendicular to the rotating shaft 29 are fixedly provided at both ends of the rotating shaft 29. The guide posts 31 are provided with sliding sleeves 32 that slide with the guide posts 31. A lifting plate 33 is fixedly provided on the sliding sleeve 32. The rotating shaft 29 is provided with a rectangular through-hole. The lower end of the lifting plate 33 passes through the rectangular through-hole and extends into the fermentation chamber. The lower end of the lifting plate 33 is connected to a plurality of pusher plates 35. There is a spacing between adjacent pusher plates 35. The heat exchange tube 5 is located in the spacing between the pusher plates 35. The upper end of the lifting plate 33 is connected to a lifting mechanism 34, which can be a cylinder or other device.

[0044] During feeding, the lifting mechanism 34 drives the lifting plate 33 and the pusher plate 35 upward, causing the lower end of the pusher plate 35 to reach the rectangular through-hole. The feed motor 30 then drives the rotating shaft 29 to rotate an appropriate angle, which in turn rotates the guide column 31, the lifting plate 33, and the pusher plate 35 as a whole. The rotation is reversed, with the lower end of the pusher plate 35 rotating toward the feed inlet. The lifting mechanism 34 then pushes the lifting plate 33 and the pusher plate 35 downward, inserting the pusher plate 35 into the fermentation pile. The feed motor 30 then drives the rotating shaft 29 in the reverse direction, driving the lifting plate 33 and the pusher plate 35 to rotate. The lower end of the pusher plate 35 now rotates toward the discharge outlet. As the pusher plate 35 rotates, it pushes the fermentation pile toward the discharge outlet.

[0045] There is a gap between the upper end of insulation plate 28 and the sidewall of composting chamber 2, allowing the solid matter obtained from solid-liquid separation to fall onto the upper end of the bottom wall of composting chamber 2 through this gap. In the present invention, when the thickness of the solid matter at the upper end of the bottom wall of composting chamber 2 reaches the thickness of the fermentation pile, the fermentation pile below insulation plate 28 is fed, causing the fermentation pile below insulation plate 28 to move downward. The fermentation pile at the lower end of the bottom wall of composting chamber 2 is discharged through the discharge port, while the solid matter at the upper end of the bottom wall of composting chamber 2 slides below insulation plate 28. The lower end of scraper 16 is parallel to the bottom wall of composting chamber 2 to ensure a uniform thickness of the solid matter.

[0046] During the composting process, microorganisms decompose organic matter and produce water. In the present invention, a drainage trough 37 is provided on the bottom wall of the composting chamber 2. A filter screen 38 is provided at the notch of the drainage trough 37. Excess water can enter the drainage trough 37 through the filter screen 38 and be discharged through the drainage trough 37. The discharged liquid can be added to the fermentation tank 1.

[0047] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A rural aquaculture wastewater fermentation system, comprising a solid-liquid separation device and a fermentation tank (1), characterized in that: A compost fermentation chamber (2) is provided above the fermentation tank (1), a feed port is provided at one end of the compost fermentation chamber (2), a discharge port is provided at the other end, and a feeding mechanism is provided in the compost fermentation chamber (2); the liquid outlet of the solid-liquid separation device is connected to the fermentation tank (1), and the solid outlet of the solid-liquid separation device is connected to the feed port; A heating mechanism (3) is provided in the fermentation tank (1), a plurality of heat exchange tubes (5) are provided in the compost fermentation chamber (2), a temperature sensor (6) is provided on the outer wall of the heat exchange tube (5), the inlet of the heat exchange tube (5) is connected to the liquid outlet of the solid-liquid separation device through a flow control valve (4), the outlet of the heat exchange tube (5) is connected to the fermentation tank (1), and the inlet of the heat exchange tube (5) is higher than the outlet of the heat exchange tube (5); the temperature sensor (6) and the flow control valve (4) are both connected to a controller (7).

2. The rural aquaculture wastewater fermentation system according to claim 1, characterized in that: The solid-liquid separation equipment comprises a horizontally arranged separation cylinder (8), a feed bin (9) is provided at the top of one end of the separation cylinder (8), and a dehydration cylinder (14) is provided at the other end, a plurality of drainage holes are provided on the cylinder walls of the dehydration cylinder (14) and the separation cylinder (8), a solid outlet is provided at the end of the dehydration cylinder (14), and the inner diameter of the dehydration cylinder (14) gradually decreases in the direction toward the solid outlet; a liquid collecting tank (10) is provided below the dehydration cylinder (14) and the separation cylinder (8), the liquid collecting tank (10) is connected to the fermentation tank (1) through a liquid infusion pipe, and a flow control valve (4) is provided at the bottom of the liquid collecting tank (10); a conveying shaft (11) is provided inside the separation cylinder (8), a spiral conveying sheet (12) is fixedly provided on the outer wall of the conveying shaft (11), and a conveying motor (13) is connected to one end of the conveying shaft (11).

3. The rural aquaculture wastewater fermentation system according to claim 2, characterized in that: An inclined conveying trough (15) is provided below the solid outlet, and the lower end of the conveying trough (15) is connected to the feed end of the compost fermentation chamber (2). A scraper (16) is provided inside the feed end of the compost fermentation chamber (2), and the scraper (16) is connected to a scraping drive mechanism (17) that drives the scraper (16) to reciprocate linear motion.

4. The rural aquaculture wastewater fermentation system according to claim 3, characterized in that: The feed end of the composting fermentation chamber (2) is provided with two support rails (18) and a material height detection mechanism (27); the support rails (18) are provided with a slide seat (19) that is slidably engaged with the support rails (18); the scraper drive mechanism (17) includes a screw rod and a scraper motor; the screw rod passes through the slide seat (19) and is threadedly engaged with the slide seat (19); one end of the screw rod is connected to the scraper motor; both ends of the scraper (16) are fixedly provided with mounting shafts (20); the mounting shafts (20) are rotatably mounted on the slide seat (19); The mounting shaft (20) is connected to an adjusting motor (21); a cavity (22) is provided in the scraper (16); a plurality of feeding holes (23) communicating with the cavity (22) are provided on one side of the scraper (16); the cavity (22) is connected to a hose (24); the hose (24) is connected to a lime feeding mechanism (26) and an air supply mechanism (25) in sequence; the lime feeding mechanism (26), the air supply mechanism (25), the material height detection mechanism (27), the scraper motor and the adjusting motor (21) are all connected to a controller (7).

5. The rural aquaculture wastewater fermentation system according to claim 1, characterized in that: The bottom wall of the compost fermentation chamber (2) is inclined, and the feed port is higher than the discharge port. A heat preservation plate (28) parallel to the bottom wall is provided in the compost fermentation chamber (2). The heat preservation plate (28), the bottom wall of the compost fermentation chamber (2), and the two side walls of the compost fermentation chamber (2) form a fermentation chamber. The heat preservation plate (28) is provided with a plurality of strip holes, the length direction of the strip holes being perpendicular to the moving direction of the material. The feeding mechanism comprises a rotating shaft (29) provided in each strip hole, one end of the rotating shaft (29) being connected to a feeding motor (30), and two ends of the rotating shaft (29) being fixedly provided with a motor perpendicular to the direction of the material. A guide post (31) of the rotating shaft (29) is provided on the guide post (31), a sliding sleeve (32) that slides with the guide post (31), a lifting plate (33) is fixedly provided on the sliding sleeve (32), a rectangular through hole is provided on the rotating shaft (29), the lower end of the lifting plate (33) passes through the rectangular through hole and extends into the fermentation chamber, and the lower end of the lifting plate (33) is connected to a plurality of push plates (35), there is a spacing between adjacent two push plates (35), and the heat exchange tube (5) is located in the spacing between the push plates (35); the upper end of the lifting plate (33) is connected to a lifting mechanism (34).

6. The rural aquaculture wastewater fermentation system according to claim 1, characterized in that: The bottom wall of the compost fermentation chamber (2) is provided with a drainage trough (37), and the notch of the drainage trough (37) is provided with a filter screen (38).

7. The rural aquaculture wastewater fermentation system according to claim 1, characterized in that: A sealing member (39) is provided in the fermentation tank (1).

8. The rural aquaculture wastewater fermentation system according to claim 1, characterized in that: An aeration pipe (40) is provided at the bottom of the fermentation tank (1), and an exhaust fan (41) is provided in the fermentation tank (1). The exhaust fan (41) is connected to an exhaust pipe (42) and an air return pipe (43). Valves are provided on both the exhaust pipe (42) and the air return pipe (43), and the air return pipe (43) is connected to the aeration pipe (40).

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