Method for preparing bio-organic fertilizer based on organic waste and prepared bio-organic fertilizer

Abstract

The invention relates to the field of organic fertilizers, and particularly discloses a method for preparing a bio-organic fertilizer based on organic waste and the prepared bio-organic fertilizer, and the method comprises the following steps: collecting animal waste and rotten vegetable leaves, removing impurities, and mixing; adjusting moisture to obtain a raw material mixture; activating a complex microbial inoculant, scattering the complex microbial inoculant into the raw material mixture, adding a microcapsule oxygen release agent, and uniformly mixing to obtain a fermentation base material; stacking fermentation is conducted on the fermentation base material, turning is conducted regularly, after fermentation is conducted for 3-5 d, water is added, after fermentation continues to be conducted for 2-3 d, smashing and sieving are conducted, and the bio-organic fertilizer is prepared; wherein the microcapsule oxygen release agent comprises a core material and a wall material, the core material comprises calcium peroxide, and the wall material is prepared from a methyl methacrylate monomer, a hydroxyethyl methylacrylate monomer and N-isopropylacrylamide in the presence of an initiator and a cross-linking agent; the invention also discloses the bio-organic fertilizer prepared by the method. The preparation method has the characteristic of preparing the bio-organic fertilizer with better comprehensive performance of organic matter content and decomposition degree.

Description

Technical Field

[0001] The present application relates to the field of organic fertilizers, and more specifically, to a method for preparing bio-organic fertilizers based on organic waste and the obtained bio-organic fertilizers. Background Art

[0002] The amount of chemical fertilizers used in China has increased significantly, playing an important role in ensuring food security. However, due to the excessive application of chemical fertilizers, a series of social problems such as low fertilizer utilization rate and ecological environment deterioration have arisen. In order to reduce the application amount of chemical fertilizers, improve fertilizer utilization rate and alleviate the pollution of chemical fertilizers to the environment, there is an urgent need for new types of fertilizers to replace some chemical fertilizers. Bio-organic fertilizers are new, efficient, and safe microbial-organic compound fertilizers formed by the combination of various beneficial microbial flora and organic fertilizers. Combining the advantages of organic fertilizers and compound microbial fertilizers, they can effectively improve fertilizer utilization rate, regulate plant metabolism, enhance root vitality and nutrient absorption capacity. Therefore, researching, developing, and reasonably applying bio-organic fertilizers is not only one of the important measures to obtain high-quality and high-yield crops and improve soil fertility, but also an inevitable trend to protect the ecological environment and promote the sustainable development of agriculture.

[0003] With the improvement of people's awareness of environmental protection and the application of the concept of sustainable development, how to effectively treat a large amount of chicken manure, pig manure, and cow manure in the livestock and poultry breeding industry has become one of the problems to be solved urgently. In addition, the tail vegetables generated in daily life also face the same problem. Although these organic wastes are rich in organic matter and nutrients such as nitrogen, phosphorus, and potassium, they are a valuable resource that can be developed and utilized. Therefore, how to convert these organic wastes into bio-organic fertilizers is of great significance for resource treatment and reuse.

[0004] Currently, the commonly adopted treatment measures mainly include composting treatment, anaerobic digestion, etc. to reduce the amount of waste and produce valuable by-products. For example, the Chinese patent with the application publication number CN105418172A discloses that functional biological agents will be added during the preparation of bio-organic fertilizers. However, after adding the agents, the organic matter content of the obtained bio-organic fertilizers is too high, and the bio-organic fertilizers with too high organic matter content have the problem of incomplete decomposition. After the incompletely decomposed fertilizers are applied to the soil, they will continue to decompose in the soil, consuming the oxygen in the soil, resulting in soil hypoxia and affecting the respiration of crop roots. Therefore, controlling the fermentation process to obtain bio-organic fertilizers with moderate organic matter content and appropriate degree of decomposition is of great significance for product quality and application effect. Summary of the Invention

[0005] In order to obtain bio-organic fertilizers with better comprehensive performance of organic matter content and degree of decomposition, the present application provides a method for preparing bio-organic fertilizers based on organic waste and the obtained bio-organic fertilizers.

[0006] In a first aspect, the present application provides a method for preparing bio-organic fertilizer from organic waste, adopting the following technical solution: A method for preparing bio-organic fertilizer from organic waste, comprising the following steps: S1. Collect animal feces and tail vegetables, mix them after removing impurities; S2. Adjust the water content to 55 - 65 wt%, and obtain a raw material mixture; S3. Activate the composite microbial agent and sprinkle it into the raw material mixture, and add a microcapsule oxygen-releasing agent, mix evenly to obtain a fermentation bottom material; S4. Carry out stacking fermentation on the fermentation bottom material, and turn the pile regularly. After fermenting for 3 - 5 days, add water, and continue to ferment for 2 - 3 days, then crush and sieve to obtain bio-organic fertilizer; Wherein, the microcapsule oxygen-releasing agent includes a core material and a wall material. The core material includes calcium peroxide, and the wall material is prepared from methyl methacrylate monomer, 2-hydroxyethyl methacrylate monomer and N-isopropylacrylamide under the action of an initiator and a cross-linking agent.

[0007] By adopting the above technical solution, in the present application, bio-organic fertilizer is prepared by fermentation using animal feces and tail vegetables as raw materials. A microcapsule oxygen-releasing agent is also added in the present application. The oxygen-releasing substance calcium peroxide is used as the core material and is coated with polymethyl methacrylate microspheres and poly-N-isopropylacrylamide. Poly-N-isopropylacrylamide is used as a temperature-sensitive material. At the initial stage of fermentation when the temperature is relatively low, poly-N-isopropylacrylamide is in a stretched state, covering each other crosswise, and its branches block the pores of the polymethyl methacrylate microspheres to achieve the coating of calcium peroxide. As the fermentation temperature rises, the branched poly-N-isopropylacrylamide shrinks itself, making the pores of the polymer microspheres appear and releasing the core material calcium peroxide. Calcium peroxide reacts with water to generate calcium hydroxide and oxygen. On the one hand, it provides oxygen to promote fermentation, and on the other hand, the generation of calcium hydroxide adjusts the pH of the composting system to a certain extent, making the pH weakly alkaline at 7.5 - 8.5, which is more conducive to the growth and reproduction of microorganisms, thereby accelerating the decomposition of organic matter. And the supplementation of water during the composting fermentation process in step S4, on the one hand, water decomposes to generate water and oxygen, and the oxygen provides conditions for microorganisms, while the generation of water replenishes the water in the system, enabling the system to ferment and mature better. The finally prepared bio-organic fertilizer contains higher organic matter and has a relatively higher degree of maturity, which is more conducive to the exertion of fertilizer efficiency.

[0008] Optionally, urea is further added to the core material, and the mass ratio of urea to calcium peroxide is 1:(3 - 5).

[0009] By adopting the above technical solution, since the reaction system itself will heat up during the fermentation process, and the decomposition of water is also an exothermic reaction, which makes the system temperature too high and is not conducive to the survival of microorganisms. Therefore, a small amount of urea is added in this application. The dissolution of urea in water is an endothermic reaction, so that urea is released with calcium peroxide and absorbs heat, preventing the fermentation system temperature from being too high and being unfavorable to the survival and action of microorganisms.

[0010] Optionally, tricalcium phosphate is further added to the core material, and the mass ratio of tricalcium phosphate to calcium peroxide added is 1:(6 - 7).

[0011] By adopting the above technical solution, it may be because the addition of tricalcium phosphate can enhance the activity of the microbial agent, thereby promoting the decomposition and transformation of organic matter by microorganisms, helping to decompose complex organic substances into simple nutrient substances that are easily absorbed and utilized by plants, increasing the organic matter content of the bio-organic fertilizer, and more importantly, enabling the bio-organic fertilizer to reach a stable state faster. Moreover, tricalcium phosphate also combines with organic substances, and it is found that the addition of tricalcium phosphate can significantly improve the maturity and stability of the bio-organic fertilizer. Finally, the prepared bio-organic fertilizer has a better organic matter content and a better maturity.

[0012] Optionally, when adding water in step S4, calcium superphosphate is also added, and the addition amount of calcium superphosphate is 0.1 - 0.3 wt‰ of the fermentation base material.

[0013] By adopting the above technical solution, calcium superphosphate can react with ammonia gas to generate ammonium phosphate and calcium hydrogen phosphate, forming ammonium salts that are not easily volatilized, thereby reducing ammonia emissions and nitrogen loss.

[0014] Optionally, the composite microbial agent in step S3 includes a deodorizing fermentation agent, a composite strain for feces maturation, and a high-temperature maturation bacterium. After the deodorizing fermentation agent, the composite strain for feces maturation, and the high-temperature maturation bacterium in the composite microbial agent are activated, they are respectively formed into a deodorizing fermentation liquid, a composite feces maturation bacterial liquid, and a high-temperature maturation bacterial liquid and then added; And the addition amount of the composite feces maturation bacterial liquid is 3 - 5 wt‰ of the raw material mixture, the addition amount of the deodorizing fermentation liquid is 1 - 3 wt‰ of the raw material mixture, and the addition amount of the high-temperature maturation bacterial liquid is 1 - 3 wt‰ of the raw material mixture.

[0015] By adopting the above technical solution, the compound bacterial agent selects a deodorizing fermentation agent, a compound strain for feces composting, and a high-temperature composting bacterium. The deodorizing fermentation agent is used to reduce the malodorous gas generated during the fermentation process and improve the working environment. The compound strain for feces composting is specifically used to decompose the organic matter in animal feces and accelerate the composting process. The addition of the high-temperature composting bacterium significantly shortens the fermentation time of the organic fertilizer. Moreover, during the process of decomposing organic matter, the high-temperature composting bacterium can inhibit the growth of harmful microorganisms, thereby reducing the generation of odors. At the same time, the heat generated by fermentation and the microbial metabolites also contribute to the elimination of the generated odors. The high-temperature composting bacterium can decompose the complex organic matter in the raw materials and convert it into nutrients that are easily absorbed by plants. Therefore, the organic fertilizer produced using the high-temperature composting bacterium has a higher nutrient content and better fertilizer efficiency. In this application, a biological organic fertilizer with a higher organic matter content and degree of maturity is prepared by fermenting animal feces and tail vegetables as raw materials under the action of the above compound strains.

[0016] Through the regulation of the above raw material ratios, the comprehensive performance of the degree of maturity and organic matter content of the prepared biological organic fertilizer is better. Especially the addition of the microcapsule oxygen-releasing agent requires controlling the release of oxygen to provide an oxygen environment for subsequent fermentation to promote the action of microorganisms, while preventing the temperature of the fermentation system from being too high, resulting in the inactivation of microorganisms.

[0017] Optionally, the addition amount of the microcapsule oxygen-releasing agent in step S3 is 1-3 wt% of the raw material mixture, and the addition amount of water in step S4 is 0.5-1 wt% of the fermentation bottom material.

[0018] Optionally, the microcapsule oxygen-releasing agent is prepared by the following method: 1). Dissolve methyl methacrylate monomer and 2-hydroxyethyl methacrylate monomer in toluene solvent, heat up to 60-80 °C, then add an initiator, after reacting for 30-40 min, add N-isopropylacrylamide monomer and N,N'-methylenebisacrylamide, after reacting for 30-40 min, cool, add ammonium bicarbonate particles, and disperse evenly to obtain the wall material solution; 2). Spray the wall material solution on the surface of the core material particles, and then first dry at 70-80 °C and then heat up to 110-120 °C for drying to form the microcapsule oxygen-releasing agent.

[0019] By adopting the above technical solution, in the present application, methyl methacrylate monomer and 2-hydroxyethyl methacrylate monomer are used as the main monomers of the polymethacrylate wall material. First, they are polymerized under the action of an initiator to form primary polymethacrylate, and the hydroxyl group in 2-hydroxyethyl methacrylate introduces a hydroxyl functional group into polymethyl methacrylate. Then, N-isopropylacrylamide monomer is added, and the two undergo graft polymerization to achieve the preparation of polymethacrylate-poly(N-isopropylacrylamide) graft polymer. Ammonium bicarbonate particles are added to the polymer solution, and then it is sprayed on the surface of the core particles. The surface of the core particles is coated with a polymethacrylate-poly(N-isopropylacrylamide) graft polymer wall material, and ammonium bicarbonate particles are dispersed therein. Then, it is first dried at a low temperature, and ammonium bicarbonate decomposes to form a pore structure on the wall material. Then, the temperature is further increased to volatilize the solvent, forming a porous wall material to achieve a controlled-release capsule structure for calcium peroxide core material.

[0020] Optionally, in the preparation process of the microcapsule oxygen releaser, raw materials are added according to the following parts by weight: 35 - 50 parts of methyl methacrylate monomer, 25 - 35 parts of 2-hydroxyethyl methacrylate monomer, 20 - 30 parts of toluene, 3 - 5 parts of initiator, 25 - 30 parts of N-isopropylacrylamide monomer, 3 - 5 parts of N,N'-methylenebisacrylamide, 5 - 10 parts of ammonium bicarbonate.

[0021] Optionally, the mass ratio of the wall material solution to the core particles added is 1:(1 - 1.2).

[0022] In the second aspect, the present application provides a biological organic fertilizer, adopting the following technical solution: A biological organic fertilizer is prepared by the above preparation method.

[0023] By adopting the above technical solution, the biological organic fertilizer prepared by the method provided by the present application has better maturity and organic matter content, and at the same time retains more nitrogen elements, etc.

[0024] In summary, the present application has the following beneficial effects: 1. In this application, bio-organic fertilizer is prepared by fermenting animal feces and tail vegetables as raw materials. The compound microbial agent selects deodorant fermentation agent, feces composting compound strains and high-temperature composting bacteria. The deodorant fermentation agent is used to reduce the malodorous gas generated during the fermentation process and improve the working environment. The feces composting compound strains are specifically used to decompose the organic matter in animal feces and accelerate the composting process. The addition of high-temperature composting bacteria significantly shortens the fermentation time of the organic fertilizer. Moreover, during the process of decomposing organic matter, high-temperature composting bacteria can inhibit the growth of harmful microorganisms, thereby reducing the generation of odor. At the same time, the heat generated by fermentation and the microbial metabolites also contribute to the elimination of the generated odor. High-temperature composting bacteria can decompose the complex organic matter in the raw materials and convert it into nutrients that are easily absorbed by plants. Therefore, the organic fertilizer produced using high-temperature composting bacteria has a higher nutrient content and better fertilizer efficiency. In this application, bio-organic fertilizer with a higher organic matter content and degree of maturity is prepared by fermenting animal feces and tail vegetables as raw materials under the action of the above compound strains; 2. In this application, a microcapsule oxygen-releasing agent is also added. The calcium peroxide oxygen-releasing substance is used as the core material and is coated with polymethyl methacrylate microspheres and poly(N-isopropylacrylamide). Poly(N-isopropylacrylamide) is used as a temperature-sensitive material. At the initial stage of fermentation when the temperature is relatively low, poly(N-isopropylacrylamide) is in a stretched state and crosses and covers each other. It blocks the pores of the polymethyl methacrylate microspheres in the form of branched chains to achieve the coating of calcium peroxide. As the fermentation temperature rises, the branched poly(N-isopropylacrylamide) shrinks itself, making the pores of the polymer microspheres appear and releasing the core material calcium peroxide. Calcium peroxide reacts with water to generate calcium hydroxide and oxygen. On the one hand, it provides oxygen to promote fermentation. On the other hand, the generation of calcium hydroxide adjusts the pH of the composting system to a certain extent, making the pH weakly alkaline at 7.5 - 8.5, which is more conducive to the growth and reproduction of microorganisms, thereby accelerating the decomposition of organic matter. The supplement of water during the composting fermentation process in step S4, on the one hand, water decomposes to produce water and oxygen, and the oxygen provides conditions for microorganisms, while the generation of water replenishes the water in the system, enabling the system to ferment and mature better. The finally prepared bio-organic fertilizer contains higher organic matter and has a relatively higher degree of maturity, which is more conducive to the exertion of fertilizer efficiency. Detailed implementation mode

[0025] The following further elaborates on this application in combination with examples. It should be specifically noted that: for those not indicating specific conditions in the following examples, they are carried out according to conventional conditions or the conditions recommended by the manufacturer. The raw materials used in the following examples can be obtained from ordinary commercial sources unless otherwise specified.

[0026] In the following examples, the deodorant fermentation agent selects the deodorant fermentation agent of Lihaoyuan Bioengineering (Shandong) Co., Ltd. and is used according to the instructions; For the fecal composting composite bacteria, select the fermentation and composting agent Ling of Lihaoyuan Bioengineering (Shandong) Co., Ltd. After activation, it can be used according to the method in the instruction manual. It can also be used by first preparing a composite fecal composting composite bacterial liquid by sealing and fermenting 250 g of the fermentation and composting agent Ling + 2 kg of brown sugar + 2 kg of water for 3 - 7 days and then adding it.

[0027] For the high-temperature composting bacteria, select the organic material composting agent - Lihaoyuan of Lihaoyuan Bioengineering (Shandong) Co., Ltd., with the effective viable bacteria count ≥ 100 million / g. After activation, it can be used according to the method in the instruction manual. It can also be used by first preparing a composite fecal composting composite bacterial liquid by sealing and fermenting 250 g of the composting bacteria + 2 kg of brown sugar + 20 kg of water for 3 - 7 days and then adding it.

[0028] The following preparation examples are for the preparation of microcapsule oxygen release agents. Preparation Example 1 A preparation method of a microcapsule oxygen release agent includes the following steps: 1). Dissolve 42 g of methyl methacrylate monomer and 30 g of 2-hydroxyethyl methacrylate monomer in 25 g of toluene solvent, heat up to 70 °C, then add 4 g of initiator benzoyl peroxide, after reacting for 35 min, add 28 g of N-isopropylacrylamide monomer and 4 g of N,N'-methylenebisacrylamide, after reacting for 35 min, cool down, add 8 g of ammonium bicarbonate particles, and disperse evenly to obtain the wall material solution. 2). Spray the wall material solution on the surface of the core material particles, and then first dry at 75 °C and then heat up to 115 °C for drying to form the microcapsule oxygen release agent.

[0029] Among them, the core material particles are selected as calcium peroxide, and the added mass ratio of the wall material solution to the core material particles is 1:1.1.

[0030] Preparation Example 2 A preparation method of a microcapsule oxygen release agent includes the following steps: 1). Dissolve 35 g of methyl methacrylate monomer and 25 g of 2-hydroxyethyl methacrylate monomer in 20 g of toluene solvent, heat up to 60 °C, then add 3 g of initiator benzoyl peroxide, after reacting for 30 min, add 25 g of N-isopropylacrylamide monomer and 3 g of N,N'-methylenebisacrylamide, after reacting for 30 min, cool down, add 5 g of ammonium bicarbonate particles, and disperse evenly to obtain the wall material solution. 2). Spray the wall material solution on the surface of the core material particles, and then first dry at 70 °C and then heat up to 110 °C for drying to form the microcapsule oxygen release agent.

[0031] Among them, the core material particles are selected as calcium peroxide, and the added mass ratio of the wall material solution to the core material particles is 1:1.

[0032] Preparation Example 3 A method for preparing a microcapsule oxygen releasing agent, comprising the following steps: 1), Dissolve 50 g of methyl methacrylate monomer and 35 g of 2-hydroxyethyl methacrylate monomer in 30 g of toluene solvent, heat up to 80 °C, then add 5 g of initiator benzoyl peroxide, after reacting for 40 min, add 30 g of N-isopropylacrylamide monomer and 5 g of N,N'-methylenebisacrylamide, after reacting for 40 min, cool, add 10 g of ammonium bicarbonate particles, and disperse evenly to obtain the wall material solution; 2), Spray the wall material solution on the surface of the core material particles, and then first dry at 80 °C and then heat up to 120 °C and dry to form the microcapsule oxygen releasing agent.

[0033] Among them, the core material particles are selected as calcium peroxide, and the added mass ratio of the wall material solution to the core material particles is 1:1.2.

[0034] Preparation Example 4 A method for preparing a microcapsule oxygen releasing agent is carried out according to the method in Preparation Example 1, the difference is that in step 2), the core material includes a mixture of urea, tricalcium phosphate and calcium peroxide, and the added mass ratio of urea to calcium peroxide is 1:4, and the added mass ratio of tricalcium phosphate to calcium peroxide is 1:6.5.

[0035] Preparation Example 5 A method for preparing a microcapsule oxygen releasing agent is carried out according to the method in Preparation Example 1, the difference is that in step 2), the core material includes a mixture of urea, tricalcium phosphate and calcium peroxide, and the added mass ratio of urea to calcium peroxide is 1:3, and the added mass ratio of tricalcium phosphate to calcium peroxide is 1:6.

[0036] Preparation Example 6 A method for preparing a microcapsule oxygen releasing agent is carried out according to the method in Preparation Example 1, the difference is that in step 2), the core material includes a mixture of urea, tricalcium phosphate and calcium peroxide, and the added mass ratio of urea to calcium peroxide is 1:5, and the added mass ratio of tricalcium phosphate to calcium peroxide is 1:7.

[0037] Comparative Preparation Example 1 A method for preparing a microcapsule oxygen releasing agent is carried out according to the method in Preparation Example 1, the difference is that N-isopropylacrylamide monomer is not added in step 1). Example

[0038] A method for preparing bio-organic fertilizer based on organic waste, comprising the following steps: S1, Collect animal manure and tail vegetables with a mass ratio of 1:0.5, remove impurities and mix them; S2. Adjust the moisture content to 60 wt% to obtain a raw material mixture; S3. Activate the deodorizing fermentation agent, the compound strain for feces composting, and the high-temperature composting bacteria respectively to form a deodorizing fermentation liquid, a compound bacteria liquid for feces composting, and a high-temperature composting bacteria liquid. Then, sprinkle them into the raw material mixture and add the microcapsule oxygen-releasing agent prepared in Preparation Example 1, and mix evenly to obtain a fermentation base material. The addition amount of the compound bacteria liquid for feces composting is 4 wt‰ of the raw material mixture, the addition amount of the deodorizing fermentation liquid is 2 wt‰ of the raw material mixture, the addition amount of the high-temperature composting bacteria liquid is 2 wt‰ of the raw material mixture, and the addition amount of the microcapsule oxygen-releasing agent is 2 wt% of the raw material mixture; S4. Stack and ferment the fermentation base material, and turn the pile regularly (turn the pile once every 2 days). After fermenting for 4 days, add water, and the addition amount of water is 0.8 wt% of the fermentation base material; After continuing to ferment for 3 days, the fermentation substrate is loose and odorless, the fermentation is completed, and it is pulverized and sieved to obtain bio-organic fertilizer. Example

[0039] A method for preparing bio-organic fertilizer based on organic waste, comprising the following steps: S1. Collect animal feces and tail vegetables with a mass ratio of 1:0.5, remove impurities and mix them; S2. Adjust the moisture content to 55 wt% to obtain a raw material mixture; S3. Activate the deodorizing fermentation agent, the compound strain for feces composting, and the high-temperature composting bacteria respectively to form a deodorizing fermentation liquid, a compound bacteria liquid for feces composting, and a high-temperature composting bacteria liquid. Then, sprinkle them into the raw material mixture and add the microcapsule oxygen-releasing agent prepared in Preparation Example 2, and mix evenly to obtain a fermentation base material. The addition amount of the compound bacteria liquid for feces composting is 3 wt‰ of the raw material mixture, the addition amount of the deodorizing fermentation liquid is 1 wt‰ of the raw material mixture, the addition amount of the high-temperature composting bacteria liquid is 1 wt‰ of the raw material mixture, and the addition amount of the microcapsule oxygen-releasing agent is 1 wt% of the raw material mixture; S4. Stack and ferment the fermentation base material, and turn the pile regularly (turn the pile once every 2 days). After fermenting for 3 days, add water, and the addition amount of water is 0.5 wt% of the fermentation base material; After continuing to ferment for 2 days, the fermentation substrate is loose and odorless, the fermentation is completed, and it is pulverized and sieved to obtain bio-organic fertilizer. Example

[0040] A method for preparing bio-organic fertilizer based on organic waste, comprising the following steps: S1. Collect animal feces and tail vegetables with a mass ratio of 1:0.5, remove impurities and mix them; S2. Adjust the moisture content to 65 wt% to obtain a raw material mixture; S3. Activate the deodorizing fermenting agent, the compound strain for feces composting, and the high-temperature composting bacteria respectively to form a deodorizing fermentation liquid, a compound bacteria liquid for feces composting, and a high-temperature composting bacteria liquid. Then sprinkle them into the raw material mixture and add the microcapsule oxygen releaser prepared in Preparation Example 3, and mix evenly to obtain a fermentation base material. The addition amount of the compound bacteria liquid for feces composting is 5 wt‰ of the raw material mixture, the addition amount of the deodorizing fermentation liquid is 3 wt‰ of the raw material mixture, the addition amount of the high-temperature composting bacteria liquid is 3 wt‰ of the raw material mixture, and the addition amount of the microcapsule oxygen releaser is 3 wt% of the raw material mixture; S4. Stack and ferment the fermentation base material, and turn the pile regularly (turn the pile once every 2 days). After fermenting for 5 days, add water, and the addition amount of water is 1 wt% of the fermentation base material; After continuing to ferment for 3 days, the fermentation substrate is loose and odorless, and the fermentation is completed. Crush and sieve to obtain the biological organic fertilizer.

[0041] Examples 4 - 6 A method for preparing biological organic fertilizer based on organic waste is carried out according to the method in Example 1, except that the microcapsule oxygen releaser in step S3 is respectively selected from the microcapsule oxygen releasers prepared in Preparation Examples 4 - 9. Example

[0042] A method for preparing biological organic fertilizer based on organic waste is carried out according to the method in Example 1, except that when adding water in step S4, superphosphate is also added, and the addition amount of superphosphate is 0.2 wt‰ of the fermentation base material. Example

[0043] A method for preparing biological organic fertilizer based on organic waste is carried out according to the method in Example 1, except that when adding water in step S4, superphosphate is also added, and the addition amount of superphosphate is 0.1 wt‰ of the fermentation base material. Example

[0044] A method for preparing biological organic fertilizer based on organic waste is carried out according to the method in Example 1, except that when adding water in step S4, superphosphate is also added, and the addition amount of superphosphate is 0.3 wt‰ of the fermentation base material.

[0045] Comparative Example 1 A method for preparing biological organic fertilizer based on organic waste is carried out according to the method in Example 1, except that the microcapsule oxygen releaser is not added in step S3.

[0046] Comparative Example 2 A method for preparing biological organic fertilizer based on organic waste is carried out according to the method in Example 1, except that the microcapsule oxygen releaser is replaced with calcium peroxide in equal amount in step S3.

[0047] Comparative Example 3 A method for preparing bio-organic fertilizer from organic waste was carried out according to the method in Example 1, except that water was not added in step S4.

[0048] Comparative Example 4 A method for preparing bio-organic fertilizer from organic waste was carried out according to the method in Example 1, except that the microcapsule oxygen releasing agent in step S3 was the microcapsule oxygen releasing agent prepared in Comparative Preparation Example 1.

[0049] Performance detection The main component contents, organic matter content, pure nitrogen content and maturity of the bio-organic fertilizers prepared in the examples and comparative examples of this application were detected.

[0050] Referring to the detection results, the organic matter content of the bio-organic fertilizer prepared in the examples of this application is above 50%, the nitrogen content is above 2%, and the maturity is also above 70%. The comprehensive performance is better. Combining the detection results of Example 1 and Examples 4-6, when urea and tricalcium phosphate are added to the microcapsule oxygen releasing agent, on the one hand, urea itself increases the nitrogen content, and on the other hand, the addition of urea can prevent the fermentation temperature from being too high, which is more conducive to the action of microorganisms. Finally, the organic matter content and maturity of the bio-organic fertilizer are also improved. Combining the detection results of Examples 7-9, when superphosphate is added while adding water, it may be that superphosphate reacts with ammonia to form ammonium salts. It is found that while the organic matter content and maturity of the finally prepared organic fertilizer are better, its nitrogen content is significantly increased.

[0051] Referring to the detection results of Example 1 and Comparative Example 1 again, when the microcapsule oxygen releasing agent was not added in Comparative Example 1, although its organic matter content was relatively high, its maturity was relatively low, and the nitrogen element content was relatively low. Combining the detection results of Comparative Example 2, when calcium peroxide was directly added without being added in the form of a slow-release capsule, although its maturity was improved, it was still relatively low. Combining the detection results of Comparative Example 3, when water was not added in step S4, both the organic matter and maturity were relatively low. Combining the detection results of Comparative Example 5, when the temperature-sensitive material was not added to the wall material of the microcapsule oxygen releasing agent, its maturity was also reduced.

[0052] This specific embodiment is only an explanation of this application, and it is not a limitation of this application. Those skilled in the art can make modifications without creative contributions to this embodiment after reading this specification, but as long as they are within the scope of the claims of this application, they are protected by the patent law.

Claims

1. A method for preparing bio-organic fertilizer based on organic waste, characterized in that: The following steps are involved: S1, collect animal feces and tail vegetables, remove impurities and mix them; S2, adjusting the water content to 55-65wt% to obtain a raw material mixture; S3, activating the composite bacterial agent and sprinkling it into the raw material mixture, adding a microcapsule oxygen-releasing agent, and mixing them evenly to obtain a fermentation base; S4, the fermentation base material is piled up for fermentation, and the pile is turned regularly, water is added after fermentation for 3-5 days, and after continuing fermentation for 2-3 days, it is crushed and sieved to obtain biological organic fertilizer; The microcapsule oxygen releaser comprises a core material and a wall material, wherein the core material comprises calcium peroxide, and the wall material is prepared from methyl methacrylate monomer, hydroxyethyl methacrylate monomer and N-isopropyl acrylamide under the action of an initiator and a crosslinking agent.

2. A method for preparing bio-organic fertilizer based on organic waste according to claim 1, characterized in that: Urea is also added to the core material, and the added mass ratio of urea to calcium peroxide is 1: (3-5).

3. A method for preparing bio-organic fertilizer based on organic waste according to claim 1, characterized in that: Tricalcium phosphate is also added to the core material, and the mass ratio of tricalcium phosphate to calcium peroxide is 1: (6-7).

4. A method for preparing bio-organic fertilizer based on organic waste according to claim 1, characterized in that: In step S4, superphosphate is added at the same time as water, and the amount of superphosphate added is 0.1-0.3wt‰ of the fermentation base.

5. A method for preparing bio-organic fertilizer based on organic waste according to claim 1, characterized in that: In step S3, the composite bacterial agent includes a deodorizing fermentation agent, a feces composting composite bacterial species, and a high-temperature composting bacteria. The deodorizing fermentation agent, the feces composting composite bacterial species, and the high-temperature composting bacteria in the composite bacterial agent are activated to form a deodorizing fermentation liquid, a feces composting composite bacterial liquid, and a high-temperature composting bacterial liquid, respectively, and then added; The amount of the feces composting compound bacterial liquid added is 3-5 wt‰ of the raw material mixture, the amount of the deodorizing fermentation liquid added is 1-3 wt‰ of the raw material mixture, and the amount of the high-temperature composting bacterial liquid added is 1-3 wt‰ of the raw material mixture.

6. A method for preparing bio-organic fertilizer based on organic waste according to claim 1, characterized in that: The amount of the microcapsule oxygen-releasing agent added in step S3 is 1-3wt% of the raw material mixture, and the amount of water added in step S4 is 0.5-1wt% of the fermentation base material.

7. A method for preparing bio-organic fertilizer based on organic waste according to claim 1, characterized in that: The microcapsule oxygen-releasing agent is prepared by the following method: 1) Dissolve methyl methacrylate monomer and hydroxyethyl methacrylate monomer in toluene solvent, heat to 60-80°C, then add initiator, react for 30-40 minutes, add N-isopropyl acrylamide monomer and N,N'-methylenebisacrylamide, react for 30-40 minutes, cool, add ammonium bicarbonate particles, and disperse evenly to obtain wall material solution; 2) Spray the wall material solution onto the surface of the core material particles, and then first dry it at 70-80°C and then heat it to 110-120°C and dry it to form a microcapsule oxygen release agent.

8. A method for preparing bio-organic fertilizer based on organic waste according to claim 7, characterized in that: During the preparation of the microcapsule oxygen-releasing agent, the raw materials are added according to the following weight parts: 35-50 parts of methyl methacrylate monomer, 25-35 parts of hydroxyethyl methacrylate monomer, 20-30 parts of toluene, 3-5 parts of initiator, 25-30 parts of N-isopropyl acrylamide monomer, 3-5 parts of N,N'-methylenebisacrylamide, 5-10 parts of ammonium bicarbonate.

9. A method for preparing bio-organic fertilizer based on organic waste according to claim 1, characterized in that: The added mass ratio of wall material solution to core material particles is 1:(1-1.2).

10. A bio-organic fertilizer prepared by the method as described in any one of claims 1 to 9.