Livestock and poultry manure resource pretreatment system

Abstract

The utility model discloses a kind of resourceization pretreatment systems of livestock and poultry manure, including in the raw material pool for storing livestock and poultry manure is sequentially connected with soaking pool, grating pool, sand water separator, screening machine by pipeline, there is grinder in the screen of screening machine, its discharge port is connected with the feed inlet of screening machine, forming the circulation loop of screening and grinding, first fermentation device, second fermentation device and third fermentation device are sequentially connected in the under-screen material discharge end of screening machine. In the utility model, under the joint action of each device, the fermentation period of livestock and poultry manure can be effectively shortened, the fermentation effect of livestock and poultry manure can be effectively improved, and more organic matter in livestock and poultry manure can be converted into organic nitrogen and inorganic nitrogen, so that livestock and poultry manure can be efficiently converted into biogas and fermentation liquid which can be resourcefully utilized, with the advantages of high fermentation efficiency, good fermentation effect, good comprehensive utilization rate, etc., conducive to realizing harmless and resourceful treatment of livestock and poultry manure.

Description

Technical Field

[0001] This utility model belongs to the field of livestock and poultry manure treatment, specifically relating to a resource-based pretreatment system for livestock and poultry manure. Background Technology

[0002] With the increasing scale of livestock farms in my country, the problem of livestock and poultry manure treatment has become increasingly prominent. Taking chicken farm manure as an example, it not only contains a large amount of organic matter, nitrogen, phosphorus, and other nutrients, but may also carry pathogenic microorganisms. Improper treatment will cause serious environmental pollution and threaten human and animal health. At the same time, because manure contains a large amount of organic matter, it is also an important resource that can be utilized. Therefore, achieving the harmless and resource-based utilization of livestock and poultry manure from farms is of great significance to the environment, economy, and society.

[0003] Currently, livestock and poultry manure treatment technologies include drying, aerobic composting, and anaerobic fermentation. Among these, anaerobic fermentation has broad application prospects in the field of livestock and poultry manure treatment due to its advantages such as low cost, low energy consumption, and controllable environment. However, existing anaerobic fermentation systems typically directly ferment the materials, resulting in problems such as long fermentation time, low gas production efficiency, and unsatisfactory sterilization and deodorization. This not only fails to meet the demand for large-volume manure treatment but also makes it difficult to achieve the required standards for manure discharge. In addition, some researchers have proposed a three-stage constant-temperature biogas production system. By using a heat exchanger to regulate the temperature of the feed, three-stage constant-temperature anaerobic fermentation of the material can be achieved, which can improve the comprehensive utilization of energy and produce biogas efficiently. However, this three-stage constant-temperature biogas production system cannot effectively improve the comprehensive utilization rate of manure and is also difficult to improve the anaerobic fermentation effect of manure. Specifically: (a) By controlling the temperature of the feed, the anaerobic fermentation device is always maintained at 53°C and 37°C. Although this is beneficial to improve the high activity of methanogenic microorganisms, it will inevitably reduce the activity of other microorganisms, making it difficult to utilize different types of microorganisms to achieve the desired effect on the material. (a) The efficient degradation of organic matter, especially the difficulty in efficiently decomposing proteins in organic matter into organic and inorganic nitrogen, is not conducive to the resource-based and harmless treatment of livestock and poultry manure; (b) Whether it is agricultural waste or livestock and poultry manure, they all contain a large amount of large particulate matter. Due to their very small specific surface area, they are difficult to be effectively utilized by microorganisms. As a result, when anaerobic fermentation is carried out on livestock and poultry manure containing a large amount of organic particles and suspended matter, there are still defects such as low material utilization rate, long fermentation cycle, and unsatisfactory fermentation effect. This not only hinders the effective utilization of livestock and poultry manure, but also poses a great risk of failing to meet emission standards. It can be seen that the existing anaerobic fermentation treatment system is difficult to effectively treat livestock and poultry manure from farms and is difficult to achieve the harmless and resource-based treatment of livestock and poultry manure. Therefore, it is necessary to find a resource-based pretreatment system for livestock and poultry manure with high fermentation efficiency, good fermentation effect, and good comprehensive utilization rate, which is of great significance for promoting the harmless and resource-based treatment of livestock and poultry manure. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide a resource-based pretreatment system for livestock and poultry manure with high fermentation efficiency, good fermentation effect and good comprehensive utilization rate.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution.

[0006] A resource-based pretreatment system for livestock and poultry manure includes a raw material pool for storing livestock and poultry manure. The raw material pool is sequentially connected to a soaking pool, a grit chamber, a sand-water separator, and a screening machine via pipes. The discharge end of the screening machine is connected to a grinding mill, and the discharge port of the grinding mill is connected to the inlet of the screening machine, forming a screening and grinding loop between the screening machine and the grinding mill. The discharge end of the screening machine is sequentially connected to a first fermentation device for high-temperature anaerobic fermentation, a second fermentation device for mesophilic anaerobic fermentation, and a third fermentation device for low-temperature anaerobic fermentation.

[0007] As a further improvement to the above technical solution: the mesh size of the screen used in the screening machine is ≤100 mesh.

[0008] As a further improvement to the above technical solution: In the screening machine, a screening material collection trough is provided below the screen, and the outlet of the screening material collection trough is connected to the inlet of the first fermentation device through a pipe.

[0009] As a further improvement to the above technical solution: the outlet of the undersize material collection tank is located above the inlet of the first fermentation device, or a pumping device is provided on the pipeline between the outlet of the undersize material collection tank and the inlet of the first fermentation device.

[0010] As a further improvement to the above technical solution: the discharge port of the grinding mill and the inlet of the screening machine are connected by a pipe.

[0011] As a further improvement to the above technical solution: a pumping device is provided on the pipeline between the discharge port of the grinding mill and the inlet of the screening machine.

[0012] As a further improvement to the above technical solution: the grinding machine is a ball bearing grinding machine.

[0013] As a further improvement to the above technical solution: the first fermentation device can perform high-temperature anaerobic fermentation at a fermentation temperature of 50℃~65℃. In this embodiment, the first fermentation device refers to a device capable of realizing high-temperature anaerobic fermentation, wherein the temperature of high-temperature anaerobic fermentation is generally 50℃~65℃, but is not limited to this.

[0014] As a further improvement to the above technical solution: the second fermentation device can carry out mesophilic anaerobic fermentation at a fermentation temperature of 35℃~45℃. In this embodiment, the second fermentation device refers to a device capable of achieving high-temperature anaerobic fermentation, wherein the temperature of mesophilic anaerobic fermentation is generally 35℃~45℃, but is not limited to this.

[0015] As a further improvement to the above technical solution: the third fermentation device can perform low-temperature anaerobic fermentation at a fermentation temperature of 20℃~35℃. In this embodiment, the first fermentation device refers to a device capable of realizing low-temperature anaerobic fermentation or ambient-temperature anaerobic fermentation, wherein the temperature of low-temperature anaerobic fermentation or ambient-temperature anaerobic fermentation is generally 20℃~35℃, but is not limited to this.

[0016] As a further improvement to the above technical solution: the outlet of the first fermentation device is connected to the inlet of the second fermentation device through a pipe.

[0017] As a further improvement to the above technical solution: the outlet of the first fermentation device is located above the inlet of the second fermentation device, or a pumping device is provided on the pipeline between the outlet of the first fermentation device and the inlet of the second fermentation device.

[0018] As a further improvement to the above technical solution: the outlet of the second fermentation device is connected to the inlet of the third fermentation device through a pipe.

[0019] As a further improvement to the above technical solution: the outlet of the second fermentation device is located above the inlet of the third fermentation device, or a pumping device is provided on the pipeline between the outlet of the second fermentation device and the inlet of the third fermentation device.

[0020] As a further improvement to the above technical solution: the top of the first fermentation device, the second fermentation device and the third fermentation device are all connected to biogas delivery pipes; the gas outlet of the biogas delivery pipe is connected to a biogas storage tank.

[0021] As a further improvement to the above technical solution: the bottom of the third fermentation device is provided with a fermentation liquid outlet; the fermentation liquid outlet is connected to a fermentation liquid storage tank through a pipe.

[0022] As a further improvement to the above technical solution: the soaking tank is equipped with a stirring component inside.

[0023] As a further improvement to the above technical solution: the inlet of the soaking tank is connected to the outlet of the third fermentation device through a pipeline.

[0024] As a further improvement to the above technical solution: a pumping device is provided on the pipeline between the feed inlet of the soaking tank and the slag outlet of the third fermentation device.

[0025] As a further improvement to the above technical solution: the outlet of the soaking tank is located above the inlet of the bar screen tank, or a pumping device is provided on the pipeline between the outlet of the soaking tank and the inlet of the bar screen tank.

[0026] As a further improvement to the above technical solution: the outlet of the bar screen is located above the inlet of the sand-water separator, or a pumping device is provided on the pipeline between the outlet of the bar screen and the inlet of the sand-water separator.

[0027] As a further improvement to the above technical solution: the outlet of the undersize material collection tank is located above the inlet of the screening machine, or a pumping device is provided on the pipeline between the outlet of the sand-water separator and the inlet of the screening machine.

[0028] Compared with the prior art, the advantages of this utility model are:

[0029] (1) In view of the shortcomings of existing anaerobic fermentation treatment systems, such as low material utilization rate, long fermentation cycle, and unsatisfactory fermentation effect, as well as the difficulty in efficiently realizing the harmless and resource utilization of livestock and poultry manure, this utility model creatively proposes a resource pretreatment system for livestock and poultry manure. A soaking tank, a grid tank, a sand-water separator, and a screening machine are connected in sequence through pipes to the raw material pool for storing livestock and poultry manure. A grinding machine is connected to the discharge end of the screen material of the screening machine. The discharge port of the grinding machine is connected to the inlet of the screening machine, so that a screening and grinding loop is formed between the screening machine and the grinding machine. A first fermentation device for high-temperature anaerobic fermentation, a second fermentation device for mesophilic anaerobic fermentation, and a third fermentation device for low-temperature anaerobic fermentation are connected in sequence to the discharge end of the screen material of the screening machine.In this invention, by introducing livestock and poultry manure into a soaking tank, soluble substances in the manure can dissolve into the liquid phase. Then, through filtration and sedimentation by a grit chamber and sand separator, impurities such as feathers, woven fabrics, large particles, and sand are removed, preventing them from adversely affecting subsequent grinding and anaerobic fermentation. Based on this, a screening machine is used to screen the livestock and poultry manure, and a grinder is used to grind it. Through the combined action of these two methods, fermentation raw materials with the required particle size can be selected. Specifically, on the one hand, the grinding process... This process breaks down larger organic matter (feed, manure) and suspended solids in livestock and poultry manure into smaller particles. This significantly increases the specific surface area of ​​the fermentation material, promoting the utilization and decomposition of organic matter and suspended solids by microorganisms. Consequently, it significantly accelerates the anaerobic fermentation process and greatly shortens the fermentation cycle. Furthermore, in conjunction with a screening machine, it effectively controls the particle size of the fermentation raw materials. This not only significantly improves the comprehensive utilization rate of livestock and poultry manure but also yields fermentation raw materials with suitable particle sizes, which is beneficial for improving different anaerobic fermentation processes. The adaptability of fermentation microorganisms to fermentation raw materials can accelerate the fermentation start-up speed. In particular, during the high-temperature anaerobic fermentation stage, thermophilic methanogens growing at high temperatures can rapidly produce methane. During the mesophilic anaerobic fermentation stage, microorganisms can multiply rapidly, promoting the rapid decomposition of organic matter. This helps to further shorten the cycle of the three-stage anaerobic fermentation and ensure its stable operation. Finally, fermentation raw materials of suitable particle size are sequentially fed into the first fermentation device for high-temperature anaerobic fermentation, the second fermentation device for mesophilic anaerobic fermentation, and the third fermentation device for low-temperature anaerobic fermentation. In the first, second, and third fermentation devices, livestock and poultry manure undergoes high-temperature anaerobic fermentation, mesophilic anaerobic fermentation, and low-temperature anaerobic fermentation in sequence. This not only effectively degrades organic matter in livestock and poultry manure and improves anaerobic fermentation efficiency and the content of organic matter, nitrogen, phosphorus, and potassium in the fermentation liquid, but also kills most pathogenic microorganisms in the fermentation products, reduces odor production, and the biogas obtained can be sent to power plants for power generation, while the fermentation liquid can be used to prepare high-quality liquid organic fertilizer. Compared with conventional anaerobic fermentation treatment systems, the resource-based pretreatment system for livestock and poultry manure of this invention, through the combined action of various devices, can effectively shorten the fermentation cycle of livestock and poultry manure, effectively improve the fermentation effect of livestock and poultry manure, and convert more organic matter in livestock and poultry manure into organic nitrogen and inorganic nitrogen. Thus, it can efficiently convert livestock and poultry manure into biogas and fermentation liquid that can be utilized as resources. It has the advantages of high fermentation efficiency, good fermentation effect, and good comprehensive utilization rate, which is conducive to realizing the harmless and resource-based treatment of livestock and poultry manure.

[0030] (2) In this utility model, the mesh number of the screen used in the screening machine is ≤100 mesh. Under the action of this screen, fermentation raw materials with a particle size of ≤100 mesh can be screened out. This not only helps to promote the start-up rate of the three-stage anaerobic fermentation, but also significantly improves the fermentation effect of the three-stage anaerobic fermentation. Ultimately, it is more conducive to the harmless and resource utilization of livestock and poultry manure.

[0031] (3) In this utility model, the height of the discharge ports of the raw material pool, soaking pool, grid pool, sand-water separator, screening machine, first fermentation, second fermentation device and third fermentation device gradually decreases. Thus, the livestock and poultry manure can be efficiently treated in each device by utilizing the gravity of the material itself, which is conducive to reducing the energy consumption of livestock and poultry manure treatment and lowering the treatment cost. In addition, a pumping device (such as a sewage transfer pump) can also be set between the discharge port and the feed port of each device, which can also improve the treatment efficiency of manure. At the same time, it is also conducive to reducing the volume and height of the system, making it easier to install, maintain and use, and has a better prospect for industrial application. Attached Figure Description

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0033] Figure 1 This is a schematic diagram of the resource-based pretreatment system for livestock and poultry manure in Embodiment 1 of this utility model.

[0034] Figure 2 This is a process flow diagram of the resource-based pretreatment of livestock and poultry manure in Embodiment 1 of this utility model.

[0035] Legend:

[0036] 1. Raw material pool; 2. Soaking pool; 3. Grille pool; 4. Sand-water separator; 5. Screening machine; 6. First fermentation device; 7. Second fermentation device; 8. Third fermentation device; 9. Grinding mill; 10. Biogas transmission pipeline. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention. All materials and instruments used in the following embodiments are commercially available.

[0038] Example 1:

[0039] like Figure 1As shown, the resource-based pretreatment system for livestock and poultry manure in this embodiment includes a raw material tank 1 for storing livestock and poultry manure. The raw material tank 1 is connected in sequence by pipes to a soaking tank 2, a grit tank 3, a sand-water separator 4, and a screening machine 5. The discharge end of the oversize material of the screening machine 5 is connected to a grinding machine 9. The discharge port of the grinding machine 9 is connected to the inlet of the screening machine 5, so that a screening and grinding loop is formed between the screening machine 5 and the grinding machine 9. The discharge end of the undersize material of the screening machine 5 is connected in sequence to a first fermentation device 6 for high-temperature anaerobic fermentation, a second fermentation device 7 for mesophilic anaerobic fermentation, and a third fermentation device 8 for low-temperature anaerobic fermentation.

[0040] In this embodiment, the screen used in the screening machine 5 has a mesh size ≤100 mesh; specifically, the mesh size of the screen is 100 mesh. In this invention, the screen used in the screening machine has a mesh size ≤100 mesh. Under the action of this screen, fermentation raw materials with a particle size ≤100 mesh can be screened out. This not only helps to promote the start-up rate of the three-stage anaerobic fermentation but also significantly improves the fermentation effect of the three-stage anaerobic fermentation, ultimately making it more conducive to the harmless and resource-based utilization of livestock and poultry manure.

[0041] In this embodiment, the screening machine 5 is further provided with an undersize collection trough (not shown in the figure) below the screen. The outlet of the undersize collection trough is connected to the inlet of the first fermentation device 6 via a pipe. In this embodiment, a pumping device is provided on the pipe between the outlet of the undersize collection trough and the inlet of the first fermentation device 6. This pumping device can be a sewage transfer pump or a sludge transfer pump, but is not limited to these. In another embodiment, the outlet of the undersize collection trough is located above the inlet of the first fermentation device 6.

[0042] In this embodiment, the discharge port of the grinder 9 and the inlet of the screening machine 5 are connected by a pipe. A pumping device is provided on the pipe between the discharge port of the grinder 9 and the inlet of the screening machine 5. In this embodiment, the pumping device can be a sewage transfer pump or a sludge transfer pump, but is not limited to these.

[0043] In this embodiment, the grinding machine 9 is a ball bearing grinding machine.

[0044] In this embodiment, the first fermentation device 6 can undergo high-temperature anaerobic fermentation at a fermentation temperature of 50℃ to 65℃. Specifically, in this embodiment, high-temperature anaerobic fermentation in the first fermentation device 6 means that anaerobic fermentation can occur at a fermentation temperature of at least 50℃ to 65℃, but the fermentation temperature is not limited to 50℃ to 65℃. If the fermentation effect of high-temperature anaerobic fermentation can be improved under other temperature conditions, it can also be applied to this utility model. At the same time, the ability to undergo high-temperature anaerobic fermentation at a fermentation temperature of 50℃ to 65℃ is only one function of the first fermentation device 6.

[0045] In this embodiment, the second fermentation device 7 can undergo mesophilic anaerobic fermentation at a fermentation temperature of 35℃~45℃. Specifically, in this embodiment, mesophilic anaerobic fermentation in the second fermentation device 7 means that anaerobic fermentation can occur at a fermentation temperature of at least 35℃~45℃, but the fermentation temperature is not limited to 35℃~45℃. If the fermentation effect of mesophilic anaerobic fermentation can be improved under other temperature conditions, it can also be applied to this utility model. At the same time, the ability to undergo mesophilic anaerobic fermentation at a fermentation temperature of 35℃~45℃ is only one function of the second fermentation device 7.

[0046] In this embodiment, the third fermentation device 8 can carry out low-temperature anaerobic fermentation at a fermentation temperature of 20℃~35℃.

[0047] In this embodiment, the outlet of the first fermentation device 6 is connected to the inlet of the second fermentation device 7 via a pipe.

[0048] In this embodiment, the discharge port of the first fermentation device 6 is located above the inlet of the second fermentation device 7. In another embodiment, a pumping device is provided on the pipeline between the discharge port of the first fermentation device 6 and the inlet of the second fermentation device 7. Specifically, the pumping device can be a sewage transfer pump or a sludge transfer pump, but is not limited to these.

[0049] In this embodiment, the outlet of the second fermentation device 7 is connected to the inlet of the third fermentation device 8 via a pipe.

[0050] In this embodiment, the outlet of the second fermentation device 7 is located above the inlet of the third fermentation device 8. In another embodiment, a pumping device is provided on the pipeline between the outlet of the second fermentation device 7 and the inlet of the third fermentation device 8. Specifically, the pumping device can be a sewage transfer pump or a sludge transfer pump, but is not limited to these.

[0051] In this embodiment, the tops of the first fermentation device 6, the second fermentation device 7, and the third fermentation device 8 are all connected to biogas delivery pipes 10.

[0052] In this embodiment, the outlet end of the biogas delivery pipeline 10 is connected to a biogas storage tank. In another embodiment, the outlet end of the biogas delivery pipeline 10 may be connected to the inlet end of a combustion power plant boiler, but is not limited to this.

[0053] In this embodiment, the bottom of the third fermentation device 8 is provided with a fermentation liquid outlet (not shown in the figure).

[0054] In this embodiment, the fermentation broth outlet is connected to a fermentation broth storage tank via a pipeline. In another embodiment, the fermentation broth outlet can be connected to the inlet of a device used for producing liquid fertilizer via a pipeline, but it is not limited to this.

[0055] In this embodiment, the soaking tank 2 is equipped with a stirring component. Specifically, in this embodiment, the stirring component used is a stirrer, but it is not limited to this.

[0056] In this embodiment, the inlet of the soaking tank 2 is connected to the outlet of the third fermentation device 8 through a pipeline. A pumping device is provided on the pipeline between the inlet of the soaking tank 2 and the outlet of the third fermentation device 8. In this embodiment, the pumping device can be a sewage transfer pump or a sludge transfer pump, but is not limited to these.

[0057] In this embodiment, a pumping device is installed on the pipeline between the outlet of the soaking tank 2 and the inlet of the bar screen 3. Specifically, the pumping device can be a sewage transfer pump or a sludge transfer pump, but is not limited to these. In another embodiment, the outlet of the soaking tank 2 is located above the inlet of the bar screen 3.

[0058] In this embodiment, a pumping device is installed on the pipeline between the outlet of the bar screen 3 and the inlet of the sand separator 4. Specifically, the pumping device can be a sewage transfer pump or a sludge transfer pump, but is not limited to these. In another embodiment, the outlet of the bar screen 3 is located above the inlet of the sand separator 4.

[0059] In this embodiment, a pumping device is installed on the pipeline between the outlet of the sand-water separator 4 and the inlet of the screening machine 5. Specifically, this pumping device can be a sewage transfer pump or a sludge transfer pump, but it is not limited to these. In another embodiment, the outlet of the undersize collection tank is located above the inlet of the screening machine 5, or...

[0060] This utility model creatively proposes a resource-based pretreatment system for livestock and poultry manure. A raw material pool for storing livestock and poultry manure is connected in sequence via pipes to a soaking pool, a grit chamber, a sand-water separator, and a screening machine. A grinding mill is connected to the discharge end of the screening machine, and the discharge port of the grinding mill is connected to the inlet of the screening machine, forming a cyclic loop of screening and grinding between the screening machine and the grinding mill. A first fermentation device for high-temperature anaerobic fermentation, a second fermentation device for mesophilic anaerobic fermentation, and a third fermentation device for low-temperature anaerobic fermentation are sequentially connected to the discharge end of the screening machine. In this invention, by introducing livestock and poultry manure into a soaking tank, soluble substances in the manure can be dissolved into the liquid phase. Then, through the filtration and sedimentation of a grit chamber and a sand separator, impurities such as feathers, woven fabrics, large particles, and sand are removed from the manure, preventing them from adversely affecting subsequent grinding and anaerobic fermentation. Based on this, a screening machine is used to screen the livestock and poultry manure, and a grinding machine is used to grind it. Through the combined action of these two methods, fermentation raw materials with the required particle size can be selected. Specifically, on the one hand, the grinding action of the grinding machine can remove larger particles from the livestock and poultry manure. The organic matter (feed, manure) and suspended solids are broken down into smaller particles, which greatly increases the specific surface area of ​​the fermentation material. This promotes the utilization and decomposition of organic matter and suspended solids by microorganisms, thus significantly accelerating the anaerobic fermentation process and shortening the fermentation cycle. Furthermore, with the aid of a screening machine, the particle size of the fermentation raw materials can be effectively controlled. This not only significantly improves the comprehensive utilization rate of livestock and poultry manure but also yields fermentation raw materials with suitable particle sizes. This enhances the adaptability of different anaerobic fermentation microorganisms to the fermentation raw materials, thereby accelerating the fermentation start-up speed. In particular, during the high-temperature anaerobic fermentation stage, thermophilic methanogenic bacteria growing at high temperatures can rapidly produce methane. During the mesophilic anaerobic fermentation stage, microorganisms can multiply rapidly, promoting the rapid decomposition of organic matter. This helps to further shorten the cycle of the three-stage anaerobic fermentation and ensure its stable operation. Finally, fermentation raw materials of suitable particle size are sequentially fed into the first fermentation unit for high-temperature anaerobic fermentation, the second fermentation unit for mesophilic anaerobic fermentation, and the third fermentation unit for low-temperature anaerobic fermentation. The fermentation unit and the third fermentation unit sequentially carry out high-temperature anaerobic fermentation (e.g., fermentation temperature of 50℃~65℃), mesophilic anaerobic fermentation (e.g., fermentation temperature of 35℃~45℃), and low-temperature anaerobic fermentation (e.g., fermentation temperature of 20℃~35℃) on livestock and poultry manure. This not only effectively degrades organic matter in livestock and poultry manure and improves the efficiency of anaerobic fermentation and the content of organic matter, nitrogen, phosphorus, and potassium in the fermentation liquid, but also kills most pathogenic microorganisms in the fermentation products and reduces odor. At the same time, the biogas obtained can be sent to a power plant to generate electricity, and the fermentation liquid obtained can be used to prepare high-quality liquid organic fertilizer.

[0061] The resource-based pretreatment system for livestock and poultry manure in this embodiment, when used to treat chicken farm manure, has the following process flow diagram: Figure 2 As shown, it includes the following steps:

[0062] (1) Collect chicken farm manure and place it in raw material tank 1 for later use. Send the chicken farm manure to soaking tank 2, add tap water to soak the chicken farm manure, stir, so that the organic matter in the chicken farm manure dissolves into the water, and obtain chicken farm manure mixture.

[0063] (2) Use a pumping device (such as a sewage pump) to pump the chicken farm manure mixture into the grit tank 3. After the grit is filtered, feathers, woven fabrics, large particles and other impurities are separated, thus completing the removal of these impurities.

[0064] (3) Using a pumping device (such as a sewage pump), the chicken farm manure mixture after separation in the grit chamber 3 is pumped into the sand separator 4 to perform sedimentation treatment, separating the chicken farm manure and sand particles, and completing the removal of these sand particles.

[0065] (4) The chicken farm manure, after sand separation by the sand separator 4, is pumped into the screening machine 5 (such as a vibrating screen) for screening using a pumping device (such as a sewage pump). The particle size of the screened material is controlled to be ≤100 mesh, resulting in oversize and undersize material. In this embodiment, the undersize material can be stored in an undersize collection tank.

[0066] (5) The material on the screen is pumped into the grinder 9 (such as a ball mill) using a pumping device (such as a sewage pump) for grinding. The ground product is then returned to the screening machine 5 for screening again.

[0067] (6) The sieved material is sequentially fed to the first fermentation device 6, the second fermentation device 7, and the third fermentation device 8 for high-temperature anaerobic fermentation, mesophilic anaerobic fermentation, and low-temperature anaerobic fermentation, as detailed below:

[0068] (6.1) The screened material is fed into the first fermentation device 6 (specifically an anaerobic fermentation tank), and straw and corn cobs are added to adjust the carbon-nitrogen ratio to 31:1. The pH of the fermentation system is adjusted to 6.9 to carry out high-temperature anaerobic fermentation. The temperature of the high-temperature anaerobic fermentation is controlled at 50-65℃ and the time is 3-5 days to obtain high-temperature fermentation products and biogas.

[0069] (6.2) The high-temperature fermentation product is fed into the second fermentation device 7 (specifically an anaerobic fermentation tank), and straw and corn cobs are added to adjust the carbon-nitrogen ratio to 31:1. The pH of the fermentation system is adjusted to 7.1 to carry out mesophilic anaerobic fermentation. The temperature of the low-temperature anaerobic fermentation is controlled at 35℃~45℃ and the time is 5 days~7 days to obtain mesophilic fermentation products and biogas.

[0070] (6.3) The mesophilic fermentation products are pumped into the third fermentation device 8 (specifically an anaerobic fermentation tank) using a pumping device. Straw and corn cobs are added to adjust the carbon-nitrogen ratio to 31:1. The pH of the fermentation system is adjusted to 7.0 to carry out low-temperature anaerobic fermentation. The temperature of the low-temperature anaerobic fermentation is controlled at 20℃~35℃ and the time is 7 days~10 days to obtain biogas, fermentation liquid and biogas residue.

[0071] In this embodiment, the collected biogas is transported to the power plant for power generation through the biogas pipeline 10, the fermentation liquid is used to make liquid organic fertilizer, and the biogas residue is returned to the soaking tank 2, thereby realizing the resource utilization of livestock and poultry manure.

[0072] According to the test, the composition of biogas in step (6) is: 67% methane and 33% carbon dioxide; the content of organic matter in fermentation liquid is 51g / L and the content of nitrogen, phosphorus and potassium is 1.9g / L; the content of organic matter in biogas residue is 63% and the content of nitrogen, phosphorus and potassium is 5.5%.

[0073] The results above show that, compared with conventional anaerobic fermentation treatment systems, the resource-based pretreatment system for livestock and poultry manure of this invention, through the combined action of various devices, can effectively shorten the fermentation cycle of livestock and poultry manure, effectively improve the fermentation effect of livestock and poultry manure, and convert more organic matter in livestock and poultry manure into organic nitrogen and inorganic nitrogen. Thus, it can efficiently convert livestock and poultry manure into biogas and fermentation liquid that can be utilized as resources. It has the advantages of high fermentation efficiency, good fermentation effect, and good comprehensive utilization rate, which is conducive to realizing the harmless and resource-based treatment of livestock and poultry manure.

[0074] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present utility model using the methods and techniques disclosed above, or modify it into equivalent embodiments with equivalent changes, without departing from the spirit and technical solution of the present utility model. Therefore, any simple modifications, equivalent substitutions, equivalent changes and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the content of the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A resource-based pretreatment system for livestock and poultry manure, characterized in that, The system includes a raw material tank (1) for storing livestock and poultry manure. The raw material tank (1) is connected in sequence by pipes to a soaking tank (2), a grid tank (3), a sand-water separator (4), and a screening machine (5). The discharge end of the screened material of the screening machine (5) is connected to a grinding machine (9). The discharge port of the grinding machine (9) is connected to the inlet of the screening machine (5), so that a screening and grinding loop is formed between the screening machine (5) and the grinding machine (9). The discharge end of the screened material of the screening machine (5) is connected in sequence to a first fermentation device (6) for high-temperature anaerobic fermentation, a second fermentation device (7) for mesophilic anaerobic fermentation, and a third fermentation device (8) for low-temperature anaerobic fermentation.

2. The resource-based pretreatment system for livestock and poultry manure according to claim 1, characterized in that, The mesh size of the screen used in the screening machine (5) is ≤100 mesh.

3. The resource-based pretreatment system for livestock and poultry manure according to claim 2, characterized in that, In the screening machine (5), a screening material collection trough is provided below the screen. The outlet of the screening material collection trough is connected to the inlet of the first fermentation device (6) through a pipe. The outlet of the screening material collection trough is located above the inlet of the first fermentation device (6), or a pumping device is provided on the pipe between the outlet of the screening material collection trough and the inlet of the first fermentation device (6).

4. The resource-based pretreatment system for livestock and poultry manure according to claim 3, characterized in that, The discharge port of the grinding machine (9) is connected to the inlet of the screening machine (5) by a pipe; a pumping device is provided on the pipe between the discharge port of the grinding machine (9) and the inlet of the screening machine (5); the grinding machine (9) is a ball mill.

5. The resource-based pretreatment system for livestock and poultry manure according to any one of claims 1 to 4, characterized in that, The first fermentation device (6) can carry out high-temperature anaerobic fermentation at a fermentation temperature of 50℃~65℃. The second fermentation device (7) can carry out mesophilic anaerobic fermentation at a fermentation temperature of 35℃~45℃; The third fermentation device (8) can carry out low-temperature anaerobic fermentation at a fermentation temperature of 20℃~35℃.

6. The resource-based pretreatment system for livestock and poultry manure according to any one of claims 1 to 4, characterized in that, The outlet of the first fermentation device (6) is connected to the inlet of the second fermentation device (7) through a pipe; the outlet of the first fermentation device (6) is located above the inlet of the second fermentation device (7), or a pumping device is provided on the pipe between the outlet of the first fermentation device (6) and the inlet of the second fermentation device (7).

7. The resource-based pretreatment system for livestock and poultry manure according to any one of claims 1 to 4, characterized in that, The outlet of the second fermentation device (7) is connected to the inlet of the third fermentation device (8) through a pipe; the outlet of the second fermentation device (7) is located above the inlet of the third fermentation device (8), or a pumping device is provided on the pipe between the outlet of the second fermentation device (7) and the inlet of the third fermentation device (8).

8. The resource-based pretreatment system for livestock and poultry manure according to any one of claims 1 to 4, characterized in that, The top of the first fermentation device (6), the second fermentation device (7) and the third fermentation device (8) are all connected to biogas delivery pipes (10); the gas outlet of the biogas delivery pipes (10) is connected to a biogas storage tank. The bottom of the third fermentation device (8) is provided with a fermentation liquid outlet; the fermentation liquid outlet is connected to a fermentation liquid storage tank through a pipe.

9. The resource-based pretreatment system for livestock and poultry manure according to any one of claims 1 to 4, characterized in that, The soaking tank (2) is equipped with a stirring assembly inside; the inlet of the soaking tank (2) is connected to the slag outlet of the third fermentation device (8) through a pipe; a pumping device is provided on the pipe between the inlet of the soaking tank (2) and the slag outlet of the third fermentation device (8).

10. The resource-based pretreatment system for livestock and poultry manure according to claim 3, characterized in that, The outlet of the soaking tank (2) is located above the inlet of the grid tank (3), or a pumping device is provided on the pipe between the outlet of the soaking tank (2) and the inlet of the grid tank (3). The outlet of the bar screen (3) is located above the inlet of the sand-water separator (4), or a pumping device is provided on the pipeline between the outlet of the bar screen (3) and the inlet of the sand-water separator (4). The outlet of the undersize collection tank is located above the inlet of the screening machine (5), or a pumping device is provided on the pipeline between the outlet of the sand-water separator (4) and the inlet of the screening machine (5).

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