Method for converting livestock and poultry manure into organic fertilizer through microbial fermentation

Abstract

The invention discloses a method for converting livestock and poultry manure into an organic fertilizer through microbial fermentation, and belongs to the technical field of livestock and poultry manure conversion. The method comprises the steps that firstly, the livestock and poultry manure is subjected to physical sorting, lime or monopotassium phosphate is added according to the pH value detection result, and the pH value is adjusted to 6.5-7.5; after determining nutrient components of the feces, adding soluble salt trace elements such as zinc sulfate and mixed carbohydrates of cane sugar and glucose; traditional strains of bacillus, lactic acid bacteria, saccharomycetes and actinomycetes are mixed with novel strains separated from the periphery of a livestock and poultry farm, optimized culture is conducted through a two-step culture method, and plant extracts such as lily extracts or livestock and poultry intestinal metabolites such as short-chain fatty acid are added in the culture process. The fermentation process adopts a rotatable fermentation tank body, and comprises three stages of fermentation of rapid heating, high-temperature stabilization and cooling decomposition. And finally, low-temperature vacuum drying, crushing, granulation and addition of a coating material are performed to prepare the organic fertilizer, so that efficient resource utilization of the livestock and poultry manure is realized.

Description

Technical Field

[0001] The invention relates to the technical field of livestock and poultry excrement conversion, and in particular to a method for converting livestock and poultry excrement into organic fertilizer by utilizing microbial fermentation. Background Art

[0002] With the large-scale development of livestock and poultry farming, the amount of livestock and poultry manure is increasing, causing serious pollution to the environment. Livestock and poultry manure contains a large amount of organic matter, pathogens, parasite eggs, etc. If not handled properly, it will pollute the soil, water and air, endangering the ecological balance and human health. Therefore, how to effectively treat livestock and poultry manure has become a problem that needs to be solved urgently.

[0003] Traditional methods of treating livestock and poultry manure include direct return to the field and composting. Direct return to the field may lead to the growth of pathogens and parasite eggs in the soil, and due to the slow decomposition of organic matter in livestock and poultry manure, it may have adverse effects on crop growth, such as seedling burning. Conventional composting, due to the single microbial flora and extensive fermentation conditions, has problems such as long fermentation cycle, incomplete decomposition, and large nutrient loss. The quality of the resulting organic fertilizer is uneven, which is difficult to meet the demand for high-quality organic fertilizers in modern agriculture.

[0004] At present, the technology of converting livestock and poultry manure into organic fertilizer using microbial fermentation has gradually attracted attention. However, the existing microbial fermentation technology still has some shortcomings. For example, in the selection of microbial flora, most of them are limited to several common microorganisms, and the efficient strain resources in special environments have not been fully explored, resulting in limited ability to decompose complex components in livestock and poultry manure. In terms of fermentation technology, there is a lack of fine control of physical conditions (such as material turning, ventilation uniformity) and chemical conditions (such as pH, temperature, and dynamic changes in nutrients) during the fermentation process, resulting in low fermentation efficiency and incomplete removal of harmful substances. In the pretreatment stage, the characteristics of manure were not fully considered for targeted treatment, which affected the subsequent fermentation effect. At the same time, the post-treatment process is simple, and there is a lack of effective measures to improve the quality and stabilize the quality of fertilizers, which reduces the market competitiveness and use value of organic fertilizers.

[0005] In summary, there are many problems in the existing technology in the process of using microbial fermentation to convert livestock and poultry manure into organic fertilizer. There is an urgent need for an innovative and efficient technical solution to achieve the harmless treatment and resource utilization of livestock and poultry manure, and to improve the quality and production efficiency of organic fertilizers. Summary of the invention

[0006] The main purpose of the present invention is to provide a method for converting livestock and poultry manure into organic fertilizer by using microbial fermentation, which can effectively solve the problems mentioned in the background technology.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] A method for converting livestock and poultry manure into organic fertilizer by microbial fermentation, comprising the following steps:

[0009] S1. Pre-processing

[0010] S1.1. Physical sorting: Use multi-layer vibrating screens with different apertures to mechanically screen livestock and poultry manure to remove feathers, stones, wood blocks and other large debris. Use crushing equipment to break up sticky manure clumps.

[0011] S1.2, pH adjustment and nutritional supplementation: Detect the pH of livestock and poultry manure. When the pH value is lower than 6.0, add lime to neutralize it. When the pH value is higher than 8.0, add potassium dihydrogen phosphate to adjust the pH value to maintain it at 6.5-7.5. According to the results of the nutrient analysis of manure, add soluble salt trace elements and sugar substances as carbon source supplements for microbial growth.

[0012] S2. Selection and cultivation of microbial flora

[0013] S2.1. Construction of composite microbial flora: Screen traditional microbial strains with synergistic effects from the genera Bacillus, Lactobacillus, Saccharomyces and Actinomycetes. At the same time, isolate new strains with the ability to efficiently decompose livestock and poultry manure from places where livestock and poultry manure has been accumulated for a long time in and around livestock and poultry farms, and mix them with traditional excellent strains to construct composite microbial flora;

[0014] S2.2, Microbial culture optimization: A two-step culture method is used. First, the composite microbial flora is initially enriched and cultured in a liquid culture medium rich in nitrogen and carbon sources at 30-35°C with stirring. Then, the bacterial liquid is transferred to a culture medium simulating livestock and poultry manure components for domestication and culture.

[0015] S3. Fermentation process

[0016] S3.1, Dynamic fermentation system design: Use a rotatable fermentation tank, set up multiple layers of stirring blades and ventilation ducts inside the tank, the stirring blades slowly rotate at a speed of 0.5-1 revolutions per minute to turn the material over, the ventilation duct regularly and quantitatively transports oxygen to maintain an aerobic fermentation environment, and the ventilation duct is equipped with an air flow regulating valve and an air filter device; set up a temperature sensor and a humidity sensor outside the fermentation tank, maintain the temperature at 35-40℃ and increase the ventilation volume during the rapid reproduction period of microorganisms, and reduce the temperature and ventilation volume in the late fermentation period;

[0017] S3.2, staged fermentation control: The entire fermentation process is divided into three stages. The first stage is a rapid temperature rise period of 3-5 days, which allows microorganisms to grow and reproduce rapidly; the second stage is a high temperature stabilization period of 7-10 days, maintaining the fermentation temperature at 50-55°C, using ventilation and stirring to further decompose the complex organic matter in the material under the action of microorganisms, and using high temperature to kill pathogens, insect eggs and harmful organisms; the third stage is a cooling and composting period of 5-7 days, stopping heating and partial ventilation, allowing the fermented material to naturally cool down to 30-35°C, so that microorganisms can finally decompose and transform the residual organic matter;

[0018] S4. Post-processing

[0019] After fermentation, the material is dried using low-temperature vacuum drying technology, and then crushed and granulated into granular organic fertilizer; humic acid and sodium alginate coating materials are added during the granulation process to prevent the fertilizer from absorbing moisture and agglomerating and to control the release of nutrients.

[0020] Preferably, the rotation speed of the crushing equipment in S1.1 is 500-1000 revolutions per minute, and the crushing cutter is serrated.

[0021] Preferably, the nutrient component analysis of feces in S1.2 adopts near-infrared spectroscopy, which utilizes near-infrared light to irradiate the feces sample. The organic components and some inorganic components in the sample will absorb near-infrared light of specific wavelengths to generate corresponding spectral information. By establishing a mathematical model between the spectral information and the nutrient content, a variety of nutrients in the feces can be quickly determined.

[0022] Preferably, the soluble salt trace elements in S1.2 are specifically a mixture of zinc sulfate, ferrous sulfate, manganese sulfate, cupric chloride, and sodium molybdate; and the sugar substance is a mixture of sucrose and glucose in a mass ratio of 1:1.

[0023] Preferably, the traditional microbial strains in S2.1 are specifically Bacillus subtilis and Bacillus licheniformis, Lactobacillus acidophilus, Saccharomyces cerevisiae, and Streptomyces; the new strains are Bacillus aegypti and Comamonas koreana, and when isolating the new strains, a selective culture medium is used, the selective culture medium contains livestock and poultry manure extract, peptone and agar, and the mass proportion of livestock and poultry manure extract in the culture medium is 10%-15%.

[0024] Preferably, in the culture medium simulating livestock and poultry manure components in S2.2, livestock and poultry manure components account for 30%-50%, and the remaining components are conventional microbial culture medium components; during the culture process, specific plant extracts or special metabolites in the intestines of livestock and poultry are added as inducing factors to activate the expression of specific microbial genes, wherein the plant extract is one or more combinations of lily extract, schizonepeta tenuifolia extract, and cassia seed extract, and the special metabolites in the intestines of livestock and poultry include short-chain fatty acids, bile acids and bacteriocins.

[0025] Preferably, in the S3.2 staged fermentation control, during the rapid temperature rise period, the oxygen content in the fermentation material is maintained at 10%-15% by controlling the ventilation volume.

[0026] Preferably, in the S3.2 staged fermentation control, during the high temperature stabilization period, the rotation speed of the stirring blade is adjusted to 2-3 revolutions per minute.

[0027] Preferably, the drying temperature of the low-temperature vacuum drying technology in S4 is 40-50° C., and the vacuum degree is 0.08-0.09 MPa.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] In the pretreatment stage, physical sorting, precise pH adjustment and nutritional supplementation can effectively remove impurities, optimize material conditions and create a suitable environment for microbial growth. The selection and cultivation methods of its microbial flora are novel, and the constructed composite flora has a wide range of sources and has been optimized and cultivated. In particular, special environmental screening strains and specific induction factors are added to activate the expression of specific microbial genes, greatly improving the decomposition efficiency. In the fermentation process, the dynamic fermentation system is combined with segmented fermentation control, rotatable tanks, precise ventilation and temperature control to ensure full contact between microorganisms and materials and the fermentation effect at each stage, which can effectively kill pathogens and eggs. The low-temperature vacuum drying and coating technology in the post-processing stage not only retains the beneficial components of the fertilizer but also facilitates storage and transportation, realizing the efficient, environmentally friendly and high-quality conversion of livestock and poultry manure into high-quality organic fertilizer from multiple aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The figure is a schematic flow chart of the method steps of the present invention. DETAILED DESCRIPTION

[0031] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0032] like Figure 1As shown, a method for converting livestock and poultry manure into organic fertilizer by microbial fermentation mainly includes an early pretreatment step, a microbial flora selection and cultivation step, a fermentation process step and a post-treatment step.

[0033] The present invention is described in detail below with an actual method flow example:

[0034] Pre-processing

[0035] Physical sorting

[0036] First, the collected pig manure is transported to the physical sorting equipment. Mechanical screening is performed using multi-layer vibrating screens with different apertures (5cm, 2cm, and 1cm, from large to small). For example, on the first layer of vibrating screen with an aperture of 5cm, debris such as wood blocks and larger stones can be effectively removed; the second layer of vibrating screen with an aperture of 2cm further screens out smaller stones and some larger feathers; the third layer of vibrating screen with an aperture of 1cm intercepts some residual slightly larger debris. For the sticky pig manure lumps that still exist after passing through the vibrating screen, special crushing equipment is used to break them up. The speed of the crushing equipment is set to 700 revolutions per minute, and the crushing tool is serrated. This design can efficiently break the sticky lumps into smaller particles to ensure the uniformity of subsequent processing. At the same time, the combination of gravity sedimentation and centrifugal separation is used to separate the impurities with higher density such as gravel in the manure, so that the manure material entering the next link has a relatively uniform texture, which is conducive to the full progress of subsequent microbial fermentation.

[0037] pH regulation and nutritional supplementation

[0038] The pH of the pig manure was tested using a pH meter. After testing, the pH value of the pig manure was 5.5, which is acidic. According to the setting, food-grade calcium hydroxide (lime) was added for neutralization. During the addition process, calcium hydroxide powder was slowly added while stirring until the pH value reached 7.0 (within the appropriate range of 6.5-7.5). Then, the pig manure was analyzed for nutritional components, and this embodiment adopted near-infrared spectroscopy. The pig manure sample was placed in the sample pool of the near-infrared spectrometer, and near-infrared light was irradiated onto the sample. The organic components (such as protein, fat, cellulose, etc.) and some inorganic components (such as some minerals) in the sample will absorb near-infrared light of specific wavelengths and generate corresponding spectral information. Through the mathematical model between the spectral information and the nutrient content established in advance, a variety of nutrients in the manure can be quickly and accurately determined. For example, the analysis results show that the nitrogen content is low, the phosphorus content is moderate, and the potassium content is high. According to the analysis results, soluble salt trace elements are added, specifically a mixture of zinc sulfate, ferrous sulfate, manganese sulfate, copper chloride, and sodium molybdate, with a ratio of 1:1:1:1:1, and the amount added is determined based on the deficiency calculation. At the same time, sugar substances are added as a carbon source supplement for microbial growth. The sugar substances are a mixture of sucrose and glucose in a mass ratio of 1:1, and the addition amount is 5g per kilogram of manure.

[0039] Microbial flora selection and cultivation

[0040] Construction of composite microbial flora

[0041] Traditional microbial strains with synergistic effects, including Bacillus (Bacillus subtilis and Bacillus licheniformis), Lactobacillus (Lactobacillus acidophilus), Saccharomyces (Saccharomyces cerevisiae) and Actinomycetes (Streptomyces), were screened from the microbial strain library. These strains have been shown to have good performance in decomposing organic matter in previous studies and practices. At the same time, samples were collected from places where pig manure had been piled up for a long time around pig farms, and new strains with the ability to efficiently decompose livestock and poultry manure were isolated, namely Bacillus aegypti and Comamonas koreana. When isolating new strains, a selective culture medium was used, which contained 12% (mass percentage) of livestock and poultry manure extract, peptone and agar. This selective culture medium can provide a specific growth environment for the target new strains, inhibit the growth of other bacteria, and thus more efficiently isolate the strains we need. These new strains were mixed with traditional excellent strains to construct a composite microbial flora. For example, Bacillus subtilis can produce a variety of hydrolytic enzymes to decompose macromolecules such as protein and starch; Lactobacillus acidophilus can regulate the pH of the fermentation environment and inhibit the growth of harmful bacteria; Saccharomyces cerevisiae can use sugars for fermentation to produce beneficial metabolites; Bacillus eggi has a high deodorizing ability for pig manure and can effectively reduce the stench of the pig house environment; Comamonas koreana can produce xylanase at low temperatures and has a good degradation effect on lignocellulose in pig manure. They work together to form an efficient composite microbial community.

[0042] Microbial culture optimization

[0043] The composite microbial flora is cultured using a two-step culture method. First, in a liquid culture medium rich in nitrogen sources (such as peptone) and carbon sources (such as glucose), the temperature is controlled at 32°C, and the composite microbial flora is initially enriched and cultured at a stirring speed of 100 revolutions per minute. In this process, microorganisms can multiply rapidly and reach a certain biomass under sufficient nutrition and suitable temperature and stirring conditions. Then, the cultured microbial solution is transferred to a culture medium simulating livestock and poultry manure components for domestication and culture. In the simulated culture medium, pig manure components account for 40%, and the remaining components are conventional microbial culture medium components. During the culture process, specific plant extracts (in this embodiment, lily extract, clematis extract, and cassia seed extract are mixed in a mass ratio of 1:1:1) or special metabolites in the intestines of livestock and poultry (including short-chain fatty acids, bile acids, and bacteriocins) are added as inducing factors. These induction factors can activate the expression of specific genes in microorganisms. For example, certain components in lily extracts may activate genes in microorganisms that are related to the utilization of specific carbon sources. Short-chain fatty acids can act as signal molecules to induce microorganisms to produce more enzyme genes that decompose organic matter, thereby enabling microorganisms to better adapt to the subsequent pig manure fermentation environment and improve decomposition efficiency.

[0044] Fermentation process

[0045] Dynamic fermentation system design

[0046] The pig manure that has been pretreated and inoculated with microorganisms is put into a rotatable fermentation tank. The capacity of the fermentation tank is 10 cubic meters, and three layers of stirring blades and ventilation ducts are set in the tank. The stirring blades rotate slowly at a speed of 0.8 revolutions per minute, so that the material is fully turned in the tank to ensure full contact between the microorganisms and the manure. The ventilation duct is equipped with an air flow regulating valve and an air filter device. The filtration accuracy of the air filter device is 0.2 microns, which can effectively filter impurities and microorganisms in the air to ensure the cleanliness of the air entering the tank. Through the air flow regulating valve, oxygen can be delivered to the tank in a timely and quantitative manner to maintain an aerobic fermentation environment. A temperature sensor and a humidity sensor are set outside the fermentation tank. The measurement accuracy of the temperature sensor is ±0.5℃, and the measurement accuracy of the humidity sensor is ±2%RH. During the rapid reproduction period of microorganisms, the fermentation temperature is maintained at 38℃ by adjusting the ventilation volume and the heating system of the tank, and the ventilation volume is appropriately increased to ensure sufficient oxygen supply and promote the rapid growth and reproduction of microorganisms. In the later stage of fermentation, the temperature and ventilation volume are gradually lowered, for example, the temperature is lowered to 32°C and the ventilation volume is reduced to 60% of the early stage, so as to create suitable conditions for microbial metabolism in the later stage of fermentation.

[0047] Staged fermentation control

[0048] The entire fermentation process is divided into three stages. The first stage is a rapid temperature rise period, which lasts for 4 days. During this period, the oxygen content in the fermented material is maintained at 12% by controlling the ventilation volume. Microorganisms grow and reproduce rapidly under suitable temperature, oxygen and nutrient conditions, and the temperature of the fermented material rises rapidly to 42°C. The easily decomposable organic matter in pig manure (such as simple sugars, some proteins, etc.) begins to decompose in large quantities under the action of microorganisms. The second stage is a high temperature stabilization period, which lasts for 8 days and maintains the fermentation temperature at 52°C. At this time, the speed of the stirring blade is adjusted to 2.5 revolutions per minute, and sufficient oxygen supply is ensured through the ventilation duct. Under the synergistic effect of high temperature, stirring and ventilation, the complex organic matter in the material (such as cellulose, hemicellulose, etc.) is further decomposed by microorganisms. Moreover, in this high temperature environment, pathogens, insect eggs and other harmful organisms in pig manure can be effectively killed. For example, common pathogens such as Escherichia coli and Salmonella cannot survive under such high temperature conditions, thereby ensuring the sanitation and safety of organic fertilizers after fermentation. The third stage is a cooling and composting period, which lasts for 6 days. Stop heating, partially close the ventilation duct, and let the fermented material cool down naturally to 32°C. At this stage, microorganisms carry out the final decomposition and transformation of the residual organic matter, making the composition of the organic fertilizer more stable and mature.

[0049] Post-processing

[0050] After fermentation, the pig manure material is dried using low-temperature vacuum drying technology. The drying temperature is set at 45°C and the vacuum degree is 0.085MPa. This low-temperature vacuum drying method can avoid the destruction of beneficial microorganisms and nutrients in the fertilizer by high temperature. The dried material is crushed into smaller particles by a crushing device (such as a jet mill), and then granulated by a disc granulator. During the granulation process, humic acid and sodium alginate coating materials are added. These coating materials are mixed in a mass ratio of 1:1, and the addition amount is 5% of the mass of the fertilizer particles. The coated fertilizer particles can effectively prevent moisture absorption and agglomeration, and after being applied to the soil, the coating material will gradually decompose and slowly release nutrients, thereby improving the utilization rate of the fertilizer and facilitating the storage and transportation of the fertilizer.

[0051] Through the above embodiments, the pig manure produced by the pig farm can be efficiently converted into high-quality organic fertilizer, achieving harmless treatment and resource utilization of livestock and poultry manure, with good environmental and economic benefits. At the same time, the various parameters and conditions in this embodiment can be appropriately adjusted according to different livestock and poultry types, manure components and actual production conditions to achieve the best fermentation effect and fertilizer quality.

[0052] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for converting livestock and poultry manure into organic fertilizer by microbial fermentation, characterized in that: The following steps are involved: S1. Pre-processing S1.

1. Physical sorting: Use multi-layer vibrating screens with different apertures to mechanically screen livestock and poultry manure to remove feathers, stones, wood blocks and other large debris. Use crushing equipment to break up sticky manure clumps. S1.2, pH adjustment and nutritional supplementation: Detect the pH of livestock and poultry manure. When the pH value is lower than 6.0, add lime to neutralize it. When the pH value is higher than 8.0, add potassium dihydrogen phosphate to adjust the pH value to maintain it at 6.5-7.

5. According to the results of the nutrient analysis of manure, add soluble salt trace elements and sugar substances as carbon source supplements for microbial growth. S2. Selection and cultivation of microbial flora S2.

1. Construction of composite microbial flora: Screen traditional microbial strains with synergistic effects from the genera Bacillus, Lactobacillus, Saccharomyces and Actinomycetes. At the same time, isolate new strains with the ability to efficiently decompose livestock and poultry manure from places where livestock and poultry manure has been accumulated for a long time in and around livestock and poultry farms, and mix them with traditional excellent strains to construct composite microbial flora; S2.2, Microbial culture optimization: A two-step culture method is used. First, the composite microbial flora is initially enriched and cultured in a liquid culture medium rich in nitrogen and carbon sources at 30-35°C with stirring. Then, the bacterial liquid is transferred to a culture medium simulating livestock and poultry manure components for domestication and culture. S3. Fermentation process S3.1, Dynamic fermentation system design: Use a rotatable fermentation tank, set up multiple layers of stirring blades and ventilation ducts inside the tank, the stirring blades slowly rotate at a speed of 0.5-1 revolutions per minute to turn the material over, the ventilation duct regularly and quantitatively transports oxygen to maintain an aerobic fermentation environment, and the ventilation duct is equipped with an air flow regulating valve and an air filter device; set up a temperature sensor and a humidity sensor outside the fermentation tank, maintain the temperature at 35-40℃ and increase the ventilation volume during the rapid reproduction period of microorganisms, and reduce the temperature and ventilation volume in the late fermentation period; S3.2, staged fermentation control: The entire fermentation process is divided into three stages. The first stage is a rapid temperature rise period of 3-5 days, which allows microorganisms to grow and reproduce rapidly; the second stage is a high temperature stabilization period of 7-10 days, maintaining the fermentation temperature at 50-55°C, using ventilation and stirring to further decompose the complex organic matter in the material under the action of microorganisms, and using high temperature to kill pathogens, insect eggs and harmful organisms; the third stage is a cooling and composting period of 5-7 days, stopping heating and partial ventilation, allowing the fermented material to naturally cool down to 30-35°C, so that microorganisms can finally decompose and transform the residual organic matter; S4. Post-processing After fermentation, the material is dried using low-temperature vacuum drying technology, and then crushed and granulated into granular organic fertilizer; humic acid and sodium alginate coating materials are added during the granulation process to prevent the fertilizer from absorbing moisture and agglomerating and to control the release of nutrients.

2. The method for converting livestock and poultry manure into organic fertilizer by microbial fermentation according to claim 1, characterized in that: The rotation speed of the crushing equipment in S1.1 is 500-1000 revolutions per minute, and the crushing cutter is serrated.

3. The method for converting livestock and poultry manure into organic fertilizer by microbial fermentation according to claim 1, characterized in that: The nutrient component analysis of feces in S1.2 adopts near-infrared spectroscopy analysis, which utilizes near-infrared light to irradiate the feces sample. The organic components and some inorganic components in the sample will absorb near-infrared light of specific wavelengths to generate corresponding spectral information. By establishing a mathematical model between the spectral information and the nutrient content, a variety of nutrients in feces can be quickly determined.

4. The method for converting livestock and poultry manure into organic fertilizer by microbial fermentation according to claim 3, characterized in that: The soluble salt trace elements in S1.2 are specifically a mixture of zinc sulfate, ferrous sulfate, manganese sulfate, cupric chloride, and sodium molybdate; the sugar substance is a mixture of sucrose and glucose in a mass ratio of 1:

1.

5. The method for converting livestock and poultry manure into organic fertilizer by microbial fermentation according to claim 1, characterized in that: The traditional microbial strains in S2.1 are specifically Bacillus subtilis and Bacillus licheniformis, Lactobacillus acidophilus, Saccharomyces cerevisiae, and Streptomyces; the new strains are Bacillus aegypti and Comamonas koreana, and when isolating the new strains, a selective culture medium is used, which contains livestock and poultry manure extract, peptone and agar, and the mass proportion of livestock and poultry manure extract in the culture medium is 10%-15%.

6. The method for converting livestock and poultry manure into organic fertilizer by microbial fermentation according to claim 1, characterized in that: In the culture medium for simulating livestock and poultry manure components in S2.2, livestock and poultry manure components account for 30%-50%, and the remaining components are conventional microbial culture medium components; during the culture process, specific plant extracts or special metabolites in the intestines of livestock and poultry are added as inducing factors to activate the expression of specific microbial genes, wherein the plant extract is one or more combinations of lily extract, schisandra chinensis extract, and cassia seed extract, and the special metabolites in the intestines of livestock and poultry include short-chain fatty acids, bile acids and bacteriocins.

7. The method for converting livestock and poultry manure into organic fertilizer by microbial fermentation according to claim 1, characterized in that: In the S3.2 staged fermentation control, during the rapid temperature rise period, the oxygen content in the fermentation material is maintained at 10%-15% by controlling the ventilation volume.

8. The method for converting livestock and poultry manure into organic fertilizer by microbial fermentation according to claim 1, characterized in that: In the S3.2 staged fermentation control, during the high temperature stabilization period, the rotation speed of the stirring blade is adjusted to 2-3 revolutions per minute.

9. The method for converting livestock and poultry manure into organic fertilizer by microbial fermentation according to claim 1, characterized in that: The drying temperature of the low-temperature vacuum drying technology in S4 is 40-50°C, and the vacuum degree is 0.08-0.09MPa.

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