Resource comprehensive utilization method of livestock and poultry manure

Abstract

The invention provides a comprehensive resource utilization method for livestock and poultry manure, and relates to the technical field of environmental protection. The comprehensive resource utilization method for the livestock and poultry manure comprises the following steps: collection and pretreatment: collecting the manure generated in a livestock and poultry farm, carrying out solid-liquid separation on the collected manure, carrying out composting treatment on the solid part at the separation part, and carrying out anaerobic fermentation treatment on the liquid part; composting treatment: mixing the separated solid feces with straws and saw dust in proportion, and adjusting the carbon nitrogen ratio to (25-30): 1; in the composting process, the pile is turned regularly, the temperature of the pile body is kept at 55-65 DEG C, the humidity is controlled at 50%-60%, the composting period is 30-45 days, and finally the organic fertilizer is obtained. Through multistage treatment processes such as solid-liquid separation, composting and anaerobic fermentation, the maximum utilization of resources is realized, the generated organic fertilizer can replace part of chemical fertilizers and biogas to be used for power generation, heat supply or fuel, the biogas slurry fertilizer can be used for farmland irrigation or fertilization, and the cyclic utilization of the resources is realized.

Description

Technical Field

[0001] The invention relates to the technical field of environmental protection, and in particular to a method for comprehensive resource utilization of livestock and poultry manure. Background Art

[0002] With the development of global animal husbandry, livestock and poultry farming has become an important part of the agricultural economy. However, the problem of manure generated in the process of livestock and poultry farming has become increasingly prominent, causing serious impacts on the environment. Livestock and poultry manure contains a large amount of organic matter, nitrogen, phosphorus and other nutrients. If it is directly discharged without effective treatment, it will lead to eutrophication of water bodies, soil pollution and greenhouse gas emissions. Therefore, the comprehensive utilization of livestock and poultry manure resources has become a key way to solve breeding pollution and achieve sustainable agricultural development.

[0003] At present, the treatment methods of livestock and poultry manure mainly include several modes such as returning to the field for utilization, energy utilization and fertilizer utilization. However, in actual operation, the resource utilization of livestock and poultry manure still faces some problems. Many farms lack complete manure treatment facilities, resulting in the inability to timely and effectively treat manure. In the process of promoting the resource utilization of livestock and poultry manure, different localities have implemented different standards, resulting in improper resource utilization and environmental pollution problems. In the process of manure treatment, some farms have low resource utilization efficiency and fail to give full play to the economic and environmental benefits of manure. Therefore, technical personnel in this field provide a method for comprehensive resource utilization of livestock and poultry manure to solve the problems raised in the above background technology. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides a method for comprehensive resource utilization of livestock and poultry manure, which solves the problem that manure in existing farms cannot be processed in time and has low resource utilization efficiency.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a method for comprehensive resource utilization of livestock and poultry manure, comprising:

[0008] Collection and pretreatment: collect manure from livestock and poultry farms, separate the collected manure into solid and liquid, compost the separated solid part, and perform anaerobic fermentation on the liquid part;

[0009] Composting treatment: the separated solid manure is mixed with straw and sawdust in proportion, and the carbon-nitrogen ratio is adjusted to 25-30:1; during the composting process, the pile is turned regularly, the temperature of the pile is maintained at 55-65 degrees Celsius, and the humidity is controlled at 50%-60%. The composting cycle is 30-45 days, and finally an organic fertilizer is obtained;

[0010] Anaerobic fermentation treatment: the separated liquid manure is introduced into the anaerobic fermentation tank, and the fermentation temperature is controlled at 35 to 40 degrees Celsius. Under anaerobic conditions, microorganisms decompose organic matter to produce biogas. The fermented biogas is precipitated and filtered to obtain biogas fertilizer.

[0011] Biogas utilization: collecting biogas produced by anaerobic fermentation and using it for power generation or as fuel after purification;

[0012] Biogas slurry fertilizer utilization: using biogas slurry fertilizer for farmland irrigation or applying it to crops as liquid fertilizer;

[0013] Biogas residue treatment: the biogas residue after anaerobic fermentation is mixed with compost products for secondary fermentation to further improve the quality of fertilizer;

[0014] The application of resource-based products is to apply the final solid organic fertilizer and liquid fertilizer to agricultural production to achieve resource utilization.

[0015] Preferably, the collection and preprocessing comprises the following steps:

[0016] S1. Collect livestock and poultry manure and install slatted floors in livestock and poultry houses. The floor materials can be plastic, metal or concrete. Ensure that there are enough gaps in the floor to facilitate the leakage of manure. Set up manure trenches under the slatted floors. The width and depth of the manure trenches should be designed according to the scale of the farm and the amount of manure produced. Generally, the width is 0.5 to 1 meter and the depth is 0.3 to 0.5 meters. Set up manure collection pools in the farms. The pools should be well sealed to avoid leakage and odor. Collect livestock and poultry manure regularly or as needed every day to ensure timely cleaning of manure and avoid accumulation and fermentation. Use special transport vehicles to transport the collected manure to the treatment site;

[0017] S2. Solid-liquid separation: the collected livestock and poultry manure is separated by solid-liquid separation equipment. The water content of the separated solid part is controlled at 60% to 70% to facilitate subsequent composting treatment. The separated liquid part enters the liquid storage tank for storage and standby use.

[0018] Preferably, the composting process comprises the following steps:

[0019] S1. Raw material preparation: the separated solid manure is mixed with straw and sawdust organic auxiliary materials in proportion. The mixing ratio is adjusted according to the carbon-nitrogen ratio requirements, generally controlled at 25-30:1. When adding auxiliary materials, they should be mixed evenly to ensure a uniform carbon-nitrogen ratio. The moisture content of the mixed material is adjusted to 50%-60% to ensure the normal activity of microorganisms during the composting process. Too high or too low moisture content will affect the composting effect, which can be adjusted by adding water or drying;

[0020] S2. Composting process control, the mixed materials are piled into strips or piles, the height of the pile is generally 1.2 meters to 1.5 meters, the width is 2 to 3 meters, and the length is determined according to the site conditions. During the composting process, the pile is turned regularly, generally every 3 to 5 days, to ensure the oxygen supply and uniform temperature inside the pile, and the pile temperature is controlled at 55 to 65 degrees Celsius, and the high temperature stage is guaranteed for 10 to 15 days to effectively kill pathogens and parasite eggs. The composting cycle is 30 to 45 days, and the specific time is determined according to the ambient temperature and material characteristics;

[0021] S3. Compost product processing: After the composting is completed, the pile is spread out for natural cooling and post-ripening. The compost product is screened to remove the coarse particles that are not completely decomposed to obtain finely crushed organic fertilizer.

[0022] Preferably, the anaerobic fermentation treatment comprises the following steps:

[0023] S1. Prepare the fermentation tank, introduce the separated liquid manure into the anaerobic fermentation tank, check the sealing and thermal insulation performance of the fermentation tank, ensure the stability and safety of the fermentation process, the capacity of the fermentation tank should be selected according to the scale of the farm and the amount of manure produced, and the sealing of the fermentation tank should be checked regularly to prevent leakage and contamination;

[0024] S2. Control the fermentation process. The fermentation temperature is controlled at 35 to 40 degrees Celsius. The temperature is maintained constant through a heating or cooling system. Under anaerobic conditions, microorganisms decompose organic matter and produce biogas. The pH value and volatile fatty acid content of the fermentation liquid are monitored regularly and the fermentation conditions are adjusted. The pH value of the fermentation liquid should be controlled between 6.5 and 7.5 to ensure the normal activity of the microorganisms.

[0025] Preferably, the biogas collection and utilization is achieved by collecting biogas produced by anaerobic fermentation, purifying it to remove hydrogen sulfide and moisture, and using the purified biogas for power generation or as fuel.

[0026] Preferably, the biogas slurry fertilizer utilization comprises the following steps:

[0027] S1. Biogas slurry treatment: the fermented biogas slurry is precipitated and filtered to remove solid impurities, and the biogas slurry is diluted to adjust the nutrient concentration to meet the needs of different crops. The dilution ratio of the biogas slurry should be determined according to the crop type and soil conditions;

[0028] S2. Application of biogas slurry fertilizer: Use the treated biogas slurry fertilizer for farmland irrigation or apply it to crops as liquid fertilizer. Reasonable arrangement of fertilization time and amount should be made according to crop growth cycle and nutrient demand. Irrigation should be carried out in time after fertilization to promote nutrient absorption.

[0029] Preferably, the biogas residue treatment comprises the following steps:

[0030] S1. Mix the biogas residue with the compost product. Mix the biogas residue after anaerobic fermentation with the compost product in proportion and conduct secondary fermentation to further improve the quality of fertilizer. The temperature and humidity of the secondary fermentation should be controlled within a reasonable range.

[0031] S2. Utilization of biogas residue fertilizer: the biogas residue fertilizer after secondary fermentation is screened and packaged, and applied to agricultural production as organic fertilizer. The application of biogas residue fertilizer should avoid excessive use to prevent soil salinization.

[0032] Preferably, the resource product application comprises the following steps:

[0033] S1. Application of organic fertilizers: Apply the final solid organic fertilizers and biogas residue fertilizers to agricultural production. According to soil conditions and crop requirements, apply organic fertilizers reasonably. The storage of organic fertilizers should be protected from moisture and pollution.

[0034] S2. Biogas application: Use the collected biogas for power generation or as fuel, and reasonably arrange the use time and amount of biogas according to actual needs.

[0035] (III) Beneficial effects

[0036] The present invention provides a method for comprehensive resource utilization of livestock and poultry manure, which has the following beneficial effects:

[0037] 1. In the present invention, organic matter, nutrients and water in livestock and poultry manure are effectively separated and utilized through multi-stage treatment processes such as solid-liquid separation, composting and anaerobic fermentation, thereby realizing the maximum utilization of resources. The generated organic fertilizer can replace part of chemical fertilizers, biogas can be used for power generation, heating or as fuel, and biogas liquid fertilizer can be used for farmland irrigation or fertilization, thereby realizing the recycling of resources.

[0038] 2. In the present invention, anaerobic fermentation is used to effectively degrade organic matter in feces and sewage, thereby reducing pollutant emissions and lowering environmental pollution risks. The main component of biogas produced by anaerobic fermentation is methane, which is a potent greenhouse gas. By collecting and utilizing biogas, greenhouse gas emissions can be effectively reduced. The entire treatment process adopts a closed system to avoid open-air stacking and direct discharge of feces and sewage, and reduce odor and the breeding of mosquitoes and flies.

[0039] 3. In the present invention, the cost of manure treatment is greatly reduced through resource utilization, and the generated products such as biogas and organic fertilizer can bring economic benefits. Biogas can be used for power generation or heating, saving the use of petrochemical energy and reducing energy costs. The produced biogas slurry fertilizer and organic fertilizer can replace part of chemical fertilizers, reduce the use of chemical fertilizers, and reduce agricultural production costs.

[0040] 4. In the present invention, organic fertilizers and biogas residue fertilizers are rich in nutrients such as nitrogen, phosphorus, potassium and organic matter. Applying them to farmland can improve soil structure, increase soil fertility, and promote crop growth. By converting livestock and poultry manure into organic fertilizer and biogas, a virtuous cycle of the agricultural ecosystem is achieved, promoting the development of ecological agriculture. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the overall processing flow of the present invention. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0043] Embodiment 1:

[0044] like Figure 1 As shown, the embodiment of the present invention provides a method for comprehensive resource utilization of livestock and poultry manure, comprising:

[0045] Collection and pretreatment: collect manure from livestock and poultry farms, separate the collected manure into solid and liquid, compost the separated solid part, and perform anaerobic fermentation on the liquid part;

[0046] Composting treatment: the separated solid manure is mixed with straw and sawdust in proportion, and the carbon-nitrogen ratio is adjusted to 25-30:1; during the composting process, the pile is turned regularly, the temperature of the pile is maintained at 55-65 degrees Celsius, and the humidity is controlled at 50%-60%. The composting cycle is 30-45 days, and finally an organic fertilizer is obtained;

[0047] Anaerobic fermentation treatment: the separated liquid manure is introduced into the anaerobic fermentation tank, and the fermentation temperature is controlled at 35 to 40 degrees Celsius. Under anaerobic conditions, microorganisms decompose organic matter to produce biogas. The fermented biogas is precipitated and filtered to obtain biogas fertilizer.

[0048] Biogas utilization: collecting biogas produced by anaerobic fermentation and using it for power generation or as fuel after purification;

[0049] Biogas slurry fertilizer utilization: using biogas slurry fertilizer for farmland irrigation or applying it to crops as liquid fertilizer;

[0050] Biogas residue treatment: the biogas residue after anaerobic fermentation is mixed with compost products for secondary fermentation to further improve the quality of fertilizer;

[0051] The application of resource-based products is to apply the final solid organic fertilizer and liquid fertilizer to agricultural production to achieve resource utilization.

[0052] Collection and preprocessing include the following steps:

[0053] S1. Collect livestock and poultry manure and install slatted floors in livestock and poultry houses. The floor materials can be plastic, metal or concrete. Ensure that there are enough gaps in the floor to facilitate the leakage of manure. Set up manure trenches under the slatted floors. The width and depth of the manure trenches should be designed according to the scale of the farm and the amount of manure produced. Generally, the width is 0.5 to 1 meter and the depth is 0.3 to 0.5 meters. Set up manure collection pools in the farms. The pools should be well sealed to avoid leakage and odor. Collect livestock and poultry manure regularly or as needed every day to ensure timely cleaning of manure and avoid accumulation and fermentation. Use special transport vehicles to transport the collected manure to the treatment site;

[0054] S2. Solid-liquid separation: the collected livestock and poultry manure is separated by solid-liquid separation equipment. The water content of the separated solid part is controlled at 60% to 70% to facilitate subsequent composting treatment. The separated liquid part enters the liquid storage tank for storage and standby use.

[0055] Composting involves the following steps:

[0056] S1. Raw material preparation: the separated solid manure is mixed with straw and sawdust organic auxiliary materials in proportion. The mixing ratio is adjusted according to the carbon-nitrogen ratio requirements, generally controlled at 25-30:1. When adding auxiliary materials, they should be mixed evenly to ensure a uniform carbon-nitrogen ratio. The moisture content of the mixed material is adjusted to 50%-60% to ensure the normal activity of microorganisms during the composting process. Too high or too low moisture content will affect the composting effect, which can be adjusted by adding water or drying;

[0057] S2. Composting process control, the mixed materials are piled into strips or piles, the height of the pile is generally 1.2 meters to 1.5 meters, the width is 2 to 3 meters, and the length is determined according to the site conditions. During the composting process, the pile is turned regularly, generally every 3 to 5 days, to ensure the oxygen supply and uniform temperature inside the pile, and the pile temperature is controlled at 55 to 65 degrees Celsius, and the high temperature stage is guaranteed for 10 to 15 days to effectively kill pathogens and parasite eggs. The composting cycle is 30 to 45 days, and the specific time is determined according to the ambient temperature and material characteristics;

[0058] S3. Compost product processing: After the composting is completed, the pile is spread out for natural cooling and post-ripening. The compost product is screened to remove the coarse particles that are not completely decomposed to obtain finely crushed organic fertilizer.

[0059] Anaerobic fermentation treatment includes the following steps:

[0060] S1. Prepare the fermentation tank, introduce the separated liquid manure into the anaerobic fermentation tank, check the sealing and thermal insulation performance of the fermentation tank, ensure the stability and safety of the fermentation process, the capacity of the fermentation tank should be selected according to the scale of the farm and the amount of manure produced, and the sealing of the fermentation tank should be checked regularly to prevent leakage and contamination;

[0061] S2. Control the fermentation process. The fermentation temperature is controlled at 35 to 40 degrees Celsius. The temperature is maintained constant through a heating or cooling system. Under anaerobic conditions, microorganisms decompose organic matter and produce biogas. The pH value and volatile fatty acid content of the fermentation liquid are monitored regularly and the fermentation conditions are adjusted. The pH value of the fermentation liquid should be controlled between 6.5 and 7.5 to ensure the normal activity of the microorganisms.

[0062] Biogas collection and utilization: Biogas produced by anaerobic fermentation is collected and purified to remove hydrogen sulfide and moisture. The purified biogas is then used for power generation or as fuel.

[0063] The utilization of biogas slurry fertilizer includes the following steps:

[0064] S1. Biogas slurry treatment: the fermented biogas slurry is precipitated and filtered to remove solid impurities, and the biogas slurry is diluted to adjust the nutrient concentration to meet the needs of different crops. The dilution ratio of the biogas slurry should be determined according to the crop type and soil conditions;

[0065] S2. Application of biogas slurry fertilizer: Use the treated biogas slurry fertilizer for farmland irrigation or apply it to crops as liquid fertilizer. Reasonable arrangement of fertilization time and amount should be made according to crop growth cycle and nutrient demand. Irrigation should be carried out in time after fertilization to promote nutrient absorption.

[0066] The digestate treatment process includes the following steps:

[0067] S1. Mix the biogas residue with the compost product. Mix the biogas residue after anaerobic fermentation with the compost product in proportion and conduct secondary fermentation to further improve the quality of fertilizer. The temperature and humidity of the secondary fermentation should be controlled within a reasonable range.

[0068] S2. Utilization of biogas residue fertilizer: the biogas residue fertilizer after secondary fermentation is screened and packaged, and applied to agricultural production as organic fertilizer. The application of biogas residue fertilizer should avoid excessive use to prevent soil salinization.

[0069] Resource product application includes the following steps:

[0070] S1. Application of organic fertilizers: Apply the final solid organic fertilizers and biogas residue fertilizers to agricultural production. According to soil conditions and crop requirements, apply organic fertilizers reasonably. The storage of organic fertilizers should be protected from moisture and pollution.

[0071] S2. Biogas application: Use the collected biogas for power generation or as fuel, and reasonably arrange the use time and amount of biogas according to actual needs.

[0072] Working principle:

[0073] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for comprehensive resource utilization of livestock and poultry manure, characterized in that: include: Collection and pretreatment: collect manure from livestock and poultry farms, separate the collected manure into solid and liquid, compost the separated solid part, and perform anaerobic fermentation on the liquid part; Composting treatment: the separated solid manure is mixed with straw and sawdust in proportion, and the carbon-nitrogen ratio is adjusted to 25-30:1; during the composting process, the pile is turned regularly, the temperature of the pile is maintained at 55-65 degrees Celsius, and the humidity is controlled at 50%-60%. The composting cycle is 30-45 days, and finally an organic fertilizer is obtained; Anaerobic fermentation treatment: the separated liquid manure is introduced into the anaerobic fermentation tank, and the fermentation temperature is controlled at 35 to 40 degrees Celsius. Under anaerobic conditions, microorganisms decompose organic matter to produce biogas. The fermented biogas is precipitated and filtered to obtain biogas fertilizer. Biogas utilization: collecting biogas produced by anaerobic fermentation and using it for power generation or as fuel after purification; Biogas slurry fertilizer utilization: using biogas slurry fertilizer for farmland irrigation or applying it to crops as liquid fertilizer; Biogas residue treatment: the biogas residue after anaerobic fermentation is mixed with compost products for secondary fermentation to further improve the quality of fertilizer; The application of resource-based products is to apply the final solid organic fertilizer and liquid fertilizer to agricultural production to achieve resource utilization.

2. The method for comprehensive resource utilization of livestock and poultry manure according to claim 1, characterized in that: The collection and preprocessing comprises the following steps: S1. Collect livestock and poultry manure and install slatted floors in livestock and poultry houses. The floor materials can be plastic, metal or concrete. Ensure that there are enough gaps in the floor to facilitate the leakage of manure. Set up manure trenches under the slatted floors. The width and depth of the manure trenches should be designed according to the scale of the farm and the amount of manure produced. Generally, the width is 0.5 to 1 meter and the depth is 0.3 to 0.5 meters. Set up manure collection pools in the farms. The pools should be well sealed to avoid leakage and odor. Collect livestock and poultry manure regularly or as needed every day to ensure timely cleaning of manure and avoid accumulation and fermentation. Use special transport vehicles to transport the collected manure to the treatment site; S2. Solid-liquid separation: the collected livestock and poultry manure is separated by solid-liquid separation equipment. The water content of the separated solid part is controlled at 60% to 70% to facilitate subsequent composting treatment. The separated liquid part enters the liquid storage tank for storage and standby use.

3. The method for comprehensive resource utilization of livestock and poultry manure according to claim 1, characterized in that: The composting process comprises the following steps: S1. Raw material preparation: the separated solid manure is mixed with straw and sawdust organic auxiliary materials in proportion. The mixing ratio is adjusted according to the carbon-nitrogen ratio requirements, generally controlled at 25-30:

1. When adding auxiliary materials, they should be mixed evenly to ensure a uniform carbon-nitrogen ratio. The moisture content of the mixed material is adjusted to 50%-60% to ensure the normal activity of microorganisms during the composting process. Too high or too low moisture content will affect the composting effect, which can be adjusted by adding water or drying; S2. Composting process control, the mixed materials are piled into strips or piles, the height of the pile is generally 1.2 meters to 1.5 meters, the width is 2 to 3 meters, and the length is determined according to the site conditions. During the composting process, the pile is turned regularly, generally every 3 to 5 days, to ensure the oxygen supply and uniform temperature inside the pile, and the pile temperature is controlled at 55 to 65 degrees Celsius, and the high temperature stage is guaranteed for 10 to 15 days to effectively kill pathogens and parasite eggs. The composting cycle is 30 to 45 days, and the specific time is determined according to the ambient temperature and material characteristics; S3. Compost product processing: After the composting is completed, the pile is spread out for natural cooling and post-ripening. The compost product is screened to remove the coarse particles that are not completely decomposed to obtain finely crushed organic fertilizer.

4. The method for comprehensive resource utilization of livestock and poultry manure according to claim 1, characterized in that: The anaerobic fermentation treatment comprises the following steps: S1. Prepare the fermentation tank, introduce the separated liquid manure into the anaerobic fermentation tank, check the sealing and thermal insulation performance of the fermentation tank, ensure the stability and safety of the fermentation process, the capacity of the fermentation tank should be selected according to the scale of the farm and the amount of manure produced, and the sealing of the fermentation tank should be checked regularly to prevent leakage and contamination; S2. Control the fermentation process. The fermentation temperature is controlled at 35 to 40 degrees Celsius. The temperature is maintained constant through a heating or cooling system. Under anaerobic conditions, microorganisms decompose organic matter and produce biogas. The pH value and volatile fatty acid content of the fermentation liquid are monitored regularly and the fermentation conditions are adjusted. The pH value of the fermentation liquid should be controlled between 6.5 and 7.5 to ensure the normal activity of the microorganisms.

5. The method for comprehensive resource utilization of livestock and poultry manure according to claim 1, characterized in that: The biogas collection and utilization is achieved by collecting biogas generated by anaerobic fermentation, purifying it to remove hydrogen sulfide and moisture, and using the purified biogas for power generation or as fuel.

6. The method for comprehensive resource utilization of livestock and poultry manure according to claim 1, characterized in that: The biogas slurry fertilizer utilization comprises the following steps: S1. Biogas slurry treatment: the fermented biogas slurry is precipitated and filtered to remove solid impurities, and the biogas slurry is diluted to adjust the nutrient concentration to meet the needs of different crops. The dilution ratio of the biogas slurry should be determined according to the crop type and soil conditions; S2. Application of biogas slurry fertilizer: Use the treated biogas slurry fertilizer for farmland irrigation or apply it to crops as liquid fertilizer. Reasonable arrangement of fertilization time and amount should be made according to crop growth cycle and nutrient demand. Irrigation should be carried out in time after fertilization to promote nutrient absorption.

7. The method for comprehensive resource utilization of livestock and poultry manure according to claim 1, characterized in that: The digestate treatment comprises the following steps: S1. Mix the biogas residue with the compost product. Mix the biogas residue after anaerobic fermentation with the compost product in proportion and conduct secondary fermentation to further improve the quality of fertilizer. The temperature and humidity of the secondary fermentation should be controlled within a reasonable range. S2. Utilization of biogas residue fertilizer: the biogas residue fertilizer after secondary fermentation is screened and packaged, and applied to agricultural production as organic fertilizer. The application of biogas residue fertilizer should avoid excessive use to prevent soil salinization.

8. The method for comprehensive resource utilization of livestock and poultry manure according to claim 1, characterized in that: The resource product application comprises the following steps: S1. Application of organic fertilizers: Apply the final solid organic fertilizers and biogas residue fertilizers to agricultural production. According to soil conditions and crop requirements, apply organic fertilizers reasonably. The storage of organic fertilizers should be protected from moisture and pollution. S2. Biogas application: use the collected biogas for power generation or as fuel, and reasonably arrange the use time and amount of biogas according to actual needs.

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