Centralized harmless treatment method for livestock manure in centralized livestock breeding

Abstract

The invention relates to the technical field of manure treatment, and discloses a centralized harmless treatment method for livestock manure in centralized livestock breeding, which comprises the following steps: S1, collecting livestock manure; s2, primary treatment; s3, anaerobic fermentation; s4, composting treatment; s5, killing pathogenic microorganisms; s6, wastewater treatment; s7, resource utilization is carried out; and S8, environment monitoring and control. According to the method, harmful substances (such as nitrogen, phosphorus, heavy metals and the like) in the livestock and poultry manure are effectively treated through a centralized harmless treatment technology, untreated manure is prevented from entering soil and water, pollution to the environment is remarkably reduced, the sustainability of the ecological environment is improved, and through the treatment processes of anaerobic fermentation, composting and the like, the environmental pollution is reduced. The excrement can be converted into organic fertilizer to improve the soil quality, and biogas can be recycled for power generation, so that the energy utilization efficiency is further improved, and the energy cost of a farm is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of excrement treatment, and in particular to a method for centralized harmless treatment of livestock excrement in livestock breeding. Background Art

[0002] With the rapid development of the global livestock industry, the amount of livestock manure produced has increased annually, placing tremendous pressure on the environment. The treatment of livestock manure is not merely a technical issue; it involves multiple dimensions, including environmental protection, ecological balance, and sustainable development. Untreated livestock manure contains numerous harmful substances, such as nitrogen, phosphorus, heavy metals, and harmful microorganisms. Once these substances enter the soil or water, they can cause serious environmental pollution. This is especially true in intensive farming models, where livestock manure is centrally discharged, making the treatment process even more complex and challenging.

[0003] Traditional methods for treating livestock manure primarily include composting, fermentation, and landfill. While these methods can reduce pollution to a certain extent, most processes are inefficient and costly, and byproducts often cannot be effectively recycled, making resource reuse difficult. Furthermore, these traditional methods often lack targeted technical support, making them unable to effectively address the needs of farms of varying sizes. They also struggle to address potential harmful gas emissions, odor, and ecological risks that may arise during the treatment process.

[0004] In recent years, as environmental awareness continues to grow, national laws and regulations on livestock pollution prevention and control have become increasingly stringent, imposing more stringent environmental standards and requirements. Against this backdrop, developing an efficient, environmentally friendly, economical, and practical technology for harmless livestock manure treatment has become a consensus within academia and industry.

[0005] To this end, we propose a method for centralized harmless treatment of livestock manure in centralized animal husbandry. Summary of the Invention

[0006] The present invention mainly solves the technical problems existing in the above-mentioned prior art and provides a centralized harmless treatment method for livestock manure in livestock breeding.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme, a centralized harmless treatment method for livestock manure in animal husbandry, comprising the following steps: S1: Collection of livestock manure: including installation of an automated collection device, regular collection and installation, and transportation to a treatment station; S2: Preliminary treatment: including screening of impurities and moisture adjustment; S3: Anaerobic fermentation: including fermentation equipment setting, fermentation process control, and biogas recovery; S4: Composting: including composting site planning, turning, and aerobic fermentation; S5: Killing of pathogenic microorganisms: including high-temperature treatment and auxiliary sterilization technology; S6: Wastewater treatment: including wastewater collection and filtration and chemical treatment; S7: Resource utilization: including biogas power generation, organic fertilizer production, and other by-products; S8: Environmental monitoring and control: including real-time monitoring system and automatic control.

[0008] As a preference, an automated collection device: in livestock farms, special automated manure collection devices are set up for different types of livestock; scheduled collection: automatic collection is carried out twice a day, and the amount of manure collected each time is based on the number and type of livestock; transportation to the processing station: after the manure is collected, it is transported to a centralized processing station through a closed conveying pipeline system. The length of the transportation pipeline can be customized according to the scale of the farm to ensure that there is no leakage during the transportation process and to prevent secondary pollution.

[0009] As a preference, impurities are screened: after the feces are transported to the processing station, impurities are first screened; moisture adjustment: the water content of feces is relatively high, usually reaching about 80%. In order to improve the efficiency of subsequent processing, the moisture content of feces needs to be reduced to 50%-60% through dehydration equipment, and dehydration treatment is carried out through filter press or centrifugal dehydration equipment. Each dehydrator can dehydrate 3-3.5 tons of feces per hour, and the moisture content of the treated feces is reduced to below 60%.

[0010] Preferably, the fermentation equipment is set up as follows: the treated feces are sent to an anaerobic fermentation tank, and a temperature control device is provided inside the fermentation tank to ensure that the temperature is maintained between 30-40°C, which is suitable for the activity of anaerobic bacteria. The volume of the fermentation tank is 100-120 cubic meters, and each batch can process 10-12 tons of feces; fermentation process control: through the intelligent control system, the feces are stirred regularly to ensure uniform fermentation of the feces. Anaerobic fermentation usually takes 7-15 days, and the specific time is adjusted according to the temperature, moisture content of the feces and activity of the bacteria. During the fermentation process, anaerobic bacteria decompose the organic matter in the feces and produce biogas. The biogas produced by fermentation of each ton of feces is about 0.2-0.3 cubic meters; biogas recovery: the biogas produced during the fermentation process is collected through a pipeline system and stored in a biogas storage tank for subsequent energy utilization.

[0011] As a preference, composting site planning: after fermentation, the feces are transferred to the composting yard. The composting area is 500 square meters. Each composting area can accommodate 10-15 tons of compost raw materials. The composting area needs to be well ventilated and the humidity should be adjusted according to the season and climatic conditions; turning and aerobic fermentation: during the composting process, the compost is turned every 3-5 days by a compost turning machine to maintain the effect of aerobic fermentation during the composting process. During the composting process, the temperature can reach 50-70℃ to kill the pathogenic microorganisms and pests. The composting process generally takes 15-30 days, and the specific time is adjusted according to the humidity, temperature and external environmental conditions of the compost raw materials; finished product screening: after the composting is completed, screening equipment is used to screen out large particles of incompletely decomposed substances in the compost raw materials to obtain mature organic fertilizer. Each batch of composting produces about 8-10 tons of organic fertilizer, which is suitable for agricultural production.

[0012] As a preference, high temperature treatment: during the anaerobic fermentation and composting process, the high temperature of the feces can effectively kill most pathogenic microorganisms, such as Salmonella, Escherichia coli, etc. In addition, the turning process in the composting stage can also improve the ventilation of the pile and accelerate the inactivation of harmful microorganisms; auxiliary sterilization technology: to further ensure the harmless treatment effect, microbial preparations or disinfectants can be added during the composting process to further enhance the killing ability of harmful pathogens. About 99.9% of pathogenic microorganisms can be killed per ton of feces.

[0013] As a preferred option, wastewater collection and filtration: During the entire treatment process, a certain amount of wastewater is generated. The wastewater first undergoes coarse filtration to remove large particles of impurities. After preliminary filtration, the wastewater is further purified through an activated carbon filter. Chemical treatment: After the activated carbon filter, the wastewater enters a chemical treatment tank where flocculants are added to precipitate suspended solids. After precipitation, the wastewater is subjected to microbial degradation again to remove organic matter. The treated wastewater meets national emission standards or can be reused for farmland irrigation.

[0014] As a preferred method, biogas power generation: biogas collected during the fermentation process can be used to generate electricity through a biogas generator set. The calorific value of biogas is about 20-25MJ / m 3 , it can generate about 1000-1500kWh of electricity per day, meeting the daily electricity needs of the farm; organic fertilizer production: the organic fertilizer produced by composting can be used for agricultural fertilization. Depending on the amount of compost, about 2000-2500 tons of organic fertilizer can be produced each year to supply surrounding farmland, improve soil quality and increase crop yields; other by-products: the treated feces can also be processed into biochar for soil improvement, or processed into feed additives to further improve resource utilization efficiency.

[0015] As a preference, a real-time monitoring system is used: during the processing, multiple environmental monitoring systems are set up to monitor key parameters such as fermentation temperature, humidity, gas composition (such as carbon dioxide and methane concentration) in real time to ensure that the processing process meets environmental protection standards. Automated control: an intelligent control system is used to adjust the working status of each link. For example, according to the real-time temperature, humidity and water content of feces, the operating parameters of the fermentation, composting and other links are automatically adjusted to ensure that the entire process is efficient and stable.

[0016] The present invention provides a centralized harmless treatment method for livestock manure from livestock farming. It has the following beneficial effects:

[0017] 1. This is a centralized harmless treatment method for livestock manure in livestock breeding. Through centralized harmless treatment technology, harmful substances (such as nitrogen, phosphorus, heavy metals, etc.) in livestock manure are effectively treated, avoiding untreated manure from entering the soil and water bodies, significantly reducing environmental pollution, and improving the sustainability of the ecological environment.

[0018] 2. This is a centralized harmless treatment method for livestock manure in livestock breeding. Through anaerobic fermentation and composting processes, the manure can not only be converted into organic fertilizer to improve soil quality, but also recycle biogas for power generation, further improving energy utilization efficiency and reducing energy costs of farms.

[0019] 3. This is a centralized harmless treatment method for livestock and poultry manure. During the treatment process, high temperature and auxiliary sterilization technology in composting and anaerobic fermentation can effectively kill pathogenic microorganisms, ensure that the treated manure meets the harmlessness standards, and reduce the risk of disease transmission.

[0020] 4. This is a centralized harmless treatment method for livestock and poultry manure. Through multi-stage filtration and chemical treatment, harmful substances in wastewater are effectively removed, meeting national emission standards or can be reused for agricultural irrigation. It not only avoids water pollution, but also realizes the resource utilization of wastewater.

[0021] 5. This centralized livestock and poultry manure harmless treatment method adopts an intelligent control system and real-time monitoring technology, which can accurately adjust the operating conditions of each link (such as temperature, humidity, etc.) to ensure the efficiency and stability of the treatment process. At the same time, it realizes automated management, reduces manual intervention, and improves work efficiency and system reliability. DETAILED DESCRIPTION

[0022] To make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] Embodiment 1: A method for the centralized harmless treatment of livestock manure in centralized animal husbandry, comprising the following steps: S1: Collection of livestock manure: comprising the installation of an automated collection device, scheduled collection and installation, and transportation to a treatment station; Automated collection device: In a livestock farm, a dedicated automated manure collection device is provided for different types of livestock. For example, for poultry such as chickens and ducks, an electric manure collection belt system is used, which can automatically clean 1 ton of manure per hour; for livestock such as cattle and pigs, a manure suction system is used, which can suck about 2 tons of manure per hour; Scheduled collection: Automatically collect manure twice a day, and the amount of manure collected each time depends on the number and type of livestock, with an average of about 3 tons of livestock manure collected each time; Transport to a treatment station: After the manure is collected, it is transported to a centralized treatment station through a closed conveying pipeline system. The length of the transport pipeline can be customized according to the scale of the farm to ensure that no leakage occurs during the transportation process and to prevent secondary pollution;

[0024] S2: Preliminary treatment: including impurity screening and moisture adjustment; impurity screening: After the feces are transported to the processing station, impurities are first screened using a 3mm pore size screen to remove large impurities (such as wood chips, stones, plastics, etc.). 5 tons of feces can be screened and processed per hour; moisture adjustment: feces have a high moisture content, usually reaching about 80%. In order to improve the efficiency of subsequent processing, the moisture content of feces needs to be reduced to 50% through dehydration equipment. Dehydration is carried out using a filter press or centrifugal dehydration equipment. Each dehydrator can dehydrate 3 tons of feces per hour, and the moisture content of the treated feces is reduced to below 60%;

[0025] S3: Anaerobic fermentation: including fermentation equipment setup, fermentation process control and biogas recovery; Fermentation equipment setup: The treated feces are sent to the anaerobic fermentation tank. A temperature control device is installed inside the fermentation tank to ensure that the temperature is maintained between 30°C, which is suitable for the activity of anaerobic bacteria. The fermentation tank has a volume of 100 cubic meters and can process 10 tons of feces per batch; Fermentation process control: Through the intelligent control system, the feces are stirred regularly to ensure uniform fermentation of the feces. Anaerobic fermentation usually takes 7 days, and the specific time is adjusted according to the temperature, moisture content of the feces and the activity of the bacterial flora. During the fermentation process, anaerobic bacteria decompose the organic matter in the feces and produce biogas. The biogas produced by each ton of feces fermentation is about 0.2 cubic meters; Biogas recovery: The biogas produced during the fermentation process is collected through a pipeline system and stored in a biogas storage tank for subsequent energy utilization;

[0026] S4: Composting: including composting site planning, turning and aerobic fermentation; Composting site planning: After fermentation, the feces are transferred to the composting site. The composting area is 500 square meters. Each composting area can accommodate 10 tons of compost raw materials. The composting area needs to be well ventilated and the humidity should be adjusted according to the season and climatic conditions; Turning and aerobic fermentation: During the composting process, the compost is turned every 3 days by a compost turning machine to maintain the effect of aerobic fermentation during the composting process. During the composting period, the temperature can reach 50°C to kill pathogenic microorganisms and pests. The composting process generally takes 15 days, and the specific time is adjusted according to the humidity, temperature and external environmental conditions of the compost raw materials; Finished product screening: After the composting is completed, screening equipment is used to screen out large particles of incompletely decomposed substances in the compost raw materials to obtain mature organic fertilizer. Each batch of composting produces about 8 tons of organic fertilizer, which is suitable for agricultural production;

[0027] S5: Killing of pathogenic microorganisms: This includes high-temperature treatment and auxiliary sterilization technologies. High-temperature treatment: During anaerobic fermentation and composting, the high temperature of feces can effectively kill most pathogenic microorganisms, such as Salmonella and E. coli. In addition, the turning process during the composting stage can also improve the ventilation of the pile and accelerate the inactivation of harmful microorganisms. Auxiliary sterilization technology: To further ensure the harmless treatment effect, microbial preparations or disinfectants can be added during the composting process to further enhance the killing ability of harmful pathogens. Approximately 99.9% of pathogenic microorganisms can be killed per ton of feces.

[0028] S6: Wastewater treatment: This includes wastewater collection and filtration, as well as chemical treatment. Wastewater collection and filtration: During the entire treatment process, a certain amount of wastewater is generated. The wastewater first undergoes coarse filtration to remove large particles of impurities. After preliminary filtration, the wastewater is further purified through an activated carbon filter. Chemical treatment: After the activated carbon filter, the wastewater enters a chemical treatment tank where flocculants are added to precipitate suspended solids. The precipitated wastewater is then subjected to microbial degradation to remove organic matter. The treated wastewater can meet national emission standards or be reused for farmland irrigation.

[0029] S7: Resource utilization: including biogas power generation, organic fertilizer production and other by-products; biogas power generation: biogas collected during the fermentation process can be used to generate electricity through a biogas generator set. The calorific value of biogas is about 20MJ / m 3, which can generate about 1,000 kWh of electricity per day, meeting the farm's daily electricity needs; organic fertilizer production: The organic fertilizer produced by composting can be used for agricultural fertilization. Depending on the amount of compost, about 2,000 tons of organic fertilizer can be produced annually to supply surrounding farmland, improve soil quality, and increase crop yields; other by-products: The treated feces can also be processed into biochar for soil improvement or feed additives, further improving resource utilization efficiency;

[0030] S8: Environmental monitoring and control: including real-time monitoring system and automatic control; real-time monitoring system: during the processing process, set up a number of environmental monitoring systems to monitor key parameters such as fermentation temperature, humidity, gas composition (such as carbon dioxide, methane concentration) in real time to ensure that the processing process meets environmental protection standards; automatic control: use intelligent control systems to adjust the working status of each link. For example, according to the real-time temperature, humidity and water content of feces, the operating parameters of fermentation, composting and other links are automatically adjusted to ensure the efficiency and stability of the entire process.

[0031] Example 2: A method for the centralized harmless treatment of livestock manure in centralized animal husbandry, comprising the following steps: S1: Collection of livestock manure: comprising the installation of an automated collection device, scheduled collection and installation, and transportation to a treatment station; Automated collection device: In a livestock farm, a dedicated automated manure collection device is provided for different types of livestock. For example, for poultry such as chickens and ducks, an electric manure collection belt system is used, which can automatically clean 1.5 tons of manure per hour; for livestock such as cattle and pigs, a manure suction system is used, which can suck about 2.5 tons of manure per hour; Scheduled collection: Automatically collect manure twice a day, and the amount of manure collected each time depends on the number and type of livestock, with an average of about 4 tons of livestock manure collected each time; Transport to a treatment station: After the manure is collected, it is transported to a centralized treatment station through a closed conveying pipeline system. The length of the transport pipeline can be customized according to the scale of the farm to ensure that no leakage occurs during the transportation process and to prevent secondary pollution;

[0032] S2: Preliminary treatment: including impurity screening and moisture adjustment; impurity screening: After the feces are transported to the processing station, impurities are first screened. A 3mm pore size mesh screen is used to remove large impurities (such as wood chips, stones, plastics, etc.). 6 tons of feces can be screened and processed per hour; moisture adjustment: feces has a high moisture content, usually reaching about 80%. In order to improve the efficiency of subsequent processing, the moisture content of feces needs to be reduced to 60% through dehydration equipment. Dehydration is carried out through filter presses or centrifugal dehydration equipment. Each dehydrator can dehydrate 3.5 tons of feces per hour, and the moisture content of the treated feces is reduced to below 60%;

[0033] S3: Anaerobic fermentation: including fermentation equipment setup, fermentation process control and biogas recovery; Fermentation equipment setup: The treated feces are sent to the anaerobic fermentation tank. A temperature control device is installed inside the fermentation tank to ensure that the temperature is maintained between 40°C, which is suitable for the activity of anaerobic bacteria. The fermentation tank has a volume of 120 cubic meters and can process 12 tons of feces per batch; Fermentation process control: Through the intelligent control system, the feces are stirred regularly to ensure uniform fermentation of the feces. Anaerobic fermentation usually takes 15 days, and the specific time is adjusted according to the temperature, moisture content of the feces and the activity of the bacterial flora. During the fermentation process, anaerobic bacteria decompose the organic matter in the feces and produce biogas. The biogas produced by each ton of feces fermentation is about 0.3 cubic meters; Biogas recovery: The biogas produced during the fermentation process is collected through a pipeline system and stored in a biogas storage tank for subsequent energy utilization;

[0034] S4: Composting: including composting site planning, turning and aerobic fermentation; Composting site planning: After fermentation, the feces are transferred to the composting site. The composting area is 500 square meters. Each composting area can accommodate 15 tons of compost raw materials. The composting area needs to be well ventilated and the humidity should be adjusted according to the season and climatic conditions; Turning and aerobic fermentation: During the composting process, the compost is turned every 5 days by a compost turning machine to maintain the effect of aerobic fermentation during the composting process. During the composting process, the temperature can reach 70°C to kill pathogenic microorganisms and pests. The composting process generally takes 30 days, and the specific time is adjusted according to the humidity, temperature and external environmental conditions of the compost raw materials; Finished product screening: After the composting is completed, screening equipment is used to screen out large particles of incompletely decomposed substances in the compost raw materials to obtain mature organic fertilizer. Each batch of composting produces about 10 tons of organic fertilizer, which is suitable for agricultural production;

[0035] S5: Killing of pathogenic microorganisms: This includes high-temperature treatment and auxiliary sterilization technologies. High-temperature treatment: During anaerobic fermentation and composting, the high temperature of feces can effectively kill most pathogenic microorganisms, such as Salmonella and E. coli. In addition, the turning process during the composting stage can also improve the ventilation of the pile and accelerate the inactivation of harmful microorganisms. Auxiliary sterilization technology: To further ensure the harmless treatment effect, microbial preparations or disinfectants can be added during the composting process to further enhance the killing ability of harmful pathogens. Approximately 99.9% of pathogenic microorganisms can be killed per ton of feces.

[0036] S6: Wastewater treatment: This includes wastewater collection and filtration, as well as chemical treatment. Wastewater collection and filtration: During the entire treatment process, a certain amount of wastewater is generated. The wastewater first undergoes coarse filtration to remove large particles of impurities. After preliminary filtration, the wastewater is further purified through an activated carbon filter. Chemical treatment: After the activated carbon filter, the wastewater enters a chemical treatment tank where flocculants are added to precipitate suspended solids. The precipitated wastewater is then subjected to microbial degradation to remove organic matter. The treated wastewater can meet national emission standards or be reused for farmland irrigation.

[0037] S7: Resource utilization: including biogas power generation, organic fertilizer production and other by-products; biogas power generation: biogas collected during the fermentation process can be used to generate electricity through a biogas generator set. The calorific value of biogas is about 25MJ / m 3 , which can generate approximately 1,500 kWh of electricity per day, meeting the farm's daily electricity needs; organic fertilizer production: The organic fertilizer produced by composting can be used for agricultural fertilization. Depending on the amount of compost, approximately 2,500 tons of organic fertilizer can be produced annually to supply surrounding farmland, improving soil quality and increasing crop yields; other by-products: The treated feces can also be processed into biochar for soil improvement or feed additives, further improving resource utilization efficiency;

[0038] S8: Environmental monitoring and control: including real-time monitoring system and automatic control; real-time monitoring system: during the processing process, set up a number of environmental monitoring systems to monitor key parameters such as fermentation temperature, humidity, gas composition (such as carbon dioxide, methane concentration) in real time to ensure that the processing process meets environmental protection standards; automatic control: use intelligent control systems to adjust the working status of each link. For example, according to the real-time temperature, humidity and water content of feces, the operating parameters of fermentation, composting and other links are automatically adjusted to ensure the efficiency and stability of the entire process.

[0039] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for the centralized harmless treatment of livestock manure from centralized animal husbandry, characterized by: The following steps are involved: S1: Collection of livestock manure: including installation of automated collection devices, scheduled collection and installation, and transportation to treatment stations; S2: Preliminary treatment: including screening of impurities and moisture adjustment; S3: Anaerobic fermentation: including fermentation equipment setup, fermentation process control and biogas recovery; S4: Composting: including composting site planning, turning and aerobic fermentation; S5: Pathogen elimination: including high temperature treatment and auxiliary sterilization technology; S6: Wastewater treatment: including wastewater collection and filtration and chemical treatment; S7: Resource utilization: including biogas power generation, organic fertilizer production and other by-products; S8: Environmental monitoring and control: including real-time monitoring system and automated control.

2. The method for centralized harmless treatment of livestock excrement according to claim 1, characterized in that: The automatic collection device: in the livestock farm, a special automatic feces collection device is set for different types of livestock; scheduled collection: automatic collection is carried out twice a day, and the amount of feces collected each time is based on the number and type of livestock; Transport to the treatment station: After the feces are collected, they are transported to the centralized treatment station through a closed pipeline system. The length of the transportation pipeline can be customized according to the scale of the site to ensure that there is no leakage during the transportation process and to prevent secondary pollution.

3. The method for centralized harmless treatment of livestock excrement according to claim 1, characterized in that: The impurity screening process: After the feces are transported to the processing station, impurities are first screened; moisture adjustment: The water content of feces is relatively high, usually reaching about 80%. In order to improve the efficiency of subsequent processing, the moisture content of the feces needs to be reduced to 50%-60% through dehydration equipment. The feces are dehydrated through a filter press or centrifugal dehydration equipment. Each dehydrator can dehydrate 3-3.5 tons of feces per hour, and the moisture content of the treated feces is reduced to below 60%.

4. The method for centralized harmless treatment of livestock excrement according to claim 1, characterized in that: The fermentation equipment is set up as follows: the treated feces are sent to an anaerobic fermentation tank. A temperature control device is installed inside the fermentation tank to ensure that the temperature is maintained between 30-40°C, which is suitable for the activity of anaerobic bacteria. The volume of the fermentation tank is 100-120 cubic meters, and each batch can process 10-12 tons of feces. Fermentation process control: Through an intelligent control system, the feces are stirred regularly to ensure uniform fermentation of the feces. Anaerobic fermentation usually takes 7-15 days, and the specific time is adjusted according to the temperature, moisture content of the feces and the activity of the bacteria. During the fermentation process, anaerobic bacteria decompose organic matter in the feces and produce biogas. The biogas produced by fermentation of each ton of feces is about 0.2-0.3 cubic meters. Biogas recovery: The biogas generated during the fermentation process is collected through a pipeline system and stored in a biogas storage tank for subsequent energy utilization.

5. The method for centralized harmless treatment of livestock excrement according to claim 1, characterized in that: The composting site planning: after fermentation is completed, the feces are transferred to the composting site. The composting area is 500 square meters. Each composting area can accommodate 10-15 tons of compost raw materials. The composting area needs to be well ventilated and the humidity is adjusted according to the season and climatic conditions; turning and aerobic fermentation: during the composting process, the compost is turned every 3-5 days by a compost turning machine to maintain the effect of aerobic fermentation during the composting process. During the composting period, the temperature can reach 50-70°C to kill pathogenic microorganisms and pests therein. The composting process generally takes 15-30 days, and the specific time is adjusted according to the humidity, temperature and external environmental conditions of the compost raw materials; finished product screening: after the composting is completed, screening equipment is used to screen out large particles of incompletely decomposed substances in the compost raw materials to obtain mature organic fertilizer. Each batch of composting produces about 8-10 tons of organic fertilizer, which is suitable for agricultural production.

6. The method for centralized harmless treatment of livestock excrement according to claim 1, characterized in that: The high-temperature treatment: During the anaerobic fermentation and composting process, the high temperature of the feces can effectively kill most pathogenic microorganisms, such as Salmonella and E. coli. In addition, the turning process in the composting stage can also improve the ventilation of the pile and accelerate the inactivation of harmful microorganisms. Auxiliary sterilization technology: To further ensure the harmless treatment effect, microbial preparations or disinfectants can be added during the composting process to further enhance the killing ability of harmful pathogens. Approximately 99.9% of pathogenic microorganisms can be killed per ton of feces.

7. The method for centralized harmless treatment of livestock excrement according to claim 1, characterized in that: Wastewater collection and filtration: Throughout the treatment process, a certain amount of wastewater is generated. This wastewater first undergoes coarse filtration to remove large particles of impurities. After this initial filtration, the wastewater is further purified through an activated carbon filter. Chemical treatment: After the activated carbon filter, the wastewater enters a chemical treatment tank where a flocculant is added to precipitate suspended solids. The settled wastewater then undergoes microbial degradation to remove organic matter. The treated wastewater meets national emission standards or can be reused for agricultural irrigation.

8. The method for centralized harmless treatment of livestock excrement according to claim 1, characterized in that: Biogas power generation: Biogas collected during the fermentation process can be used to generate electricity through a biogas generator set. The calorific value of biogas is about 20-25MJ / m 3 , it can generate about 1000-1500kWh of electricity per day, meeting the daily electricity needs of the farm; organic fertilizer production: the organic fertilizer produced by composting can be used for agricultural fertilization. Depending on the amount of compost, about 2000-2500 tons of organic fertilizer can be produced each year to supply surrounding farmland, improve soil quality and increase crop yields; other by-products: the treated feces can also be processed into biochar for soil improvement, or processed into feed additives to further improve resource utilization efficiency.

9. The method for centralized harmless treatment of livestock excrement according to claim 1, characterized in that: The real-time monitoring system: During the processing process, multiple environmental monitoring systems are set up to monitor key parameters such as fermentation temperature, humidity, gas composition (such as carbon dioxide and methane concentration) in real time to ensure that the processing process meets environmental protection standards. Automated control: An intelligent control system is used to adjust the working status of each link. For example, according to the real-time temperature, humidity and water content of feces, the operating parameters of the fermentation, composting and other links are automatically adjusted to ensure the efficiency and stability of the entire process.