Preparation method of animal waste organic fertilizer

Abstract

The invention relates to the technical field of organic fertilizers, and discloses an animal waste organic fertilizer preparation method, which comprises: S1, collecting animal waste, removing impurities in the animal waste, and crushing the waste to obtain a primary material A; s2, crushing crop straws, adding a microbial agent into the crushed crop straws, performing stirring and mixing, then continuing to add water and urea, and performing uniform mixing so as to obtain a primary material B; s3, stacking the primary material B into a strip stack, covering the surface of the strip stack with a layer of plastic film for heat preservation and moisture preservation, controlling the fermentation temperature, and accelerating the fermentation process to obtain a primary material C; s4, transferring the primary material C into a closed fermentation tank, controlling the temperature in the tank, and keeping an anaerobic environment to obtain a primary material D; s5, the primary material D is dried, modified cyclodextrin continues to be added, then smashing and sieving are conducted, and the organic fertilizer with uniform particles is obtained. The animal waste organic fertilizer has the advantages of being high in fertilizer efficiency, good in safety and environmentally friendly.

Description

Technical Field

[0001] The invention relates to the technical field of organic fertilizers, in particular to a method for preparing animal excrement organic fertilizer. Background Art

[0002] With the development of agriculture, the demand for organic fertilizers is increasing. Animal manure, as a common organic waste, is rich in nutrients such as nitrogen, phosphorus, potassium, and organic matter. If it can be used reasonably, it will become a source of high-quality organic fertilizer. However, there are many problems with the traditional direct return of animal manure to the fields. For example, the manure may contain a large number of pathogens, parasite eggs, and weed seeds, which can easily lead to soil pollution and the spread of pests and diseases. In addition, untreated manure decomposes slowly in the soil, and the fertilizer effect cannot be exerted in time. In addition, harmful gases such as ammonia may be produced during the decomposition process, causing environmental pollution. At present, the existing methods for preparing organic fertilizers from animal manure have problems such as long processing cycle, insufficient fermentation, and large loss of nutrients. It is difficult to meet the demand of modern agriculture for efficient and environmentally friendly organic fertilizers. Therefore, there is an urgent need to develop a new method for preparing organic fertilizers from animal manure to overcome the shortcomings of the existing technology. Summary of the Invention

[0003] (1) Technical problems solved

[0004] In response to the shortcomings of the existing technology, the present invention provides a method for preparing animal manure organic fertilizer, which can effectively shorten the processing cycle, improve fermentation efficiency, and reduce nutrient loss. The prepared organic fertilizer has the advantages of high fertilizer efficiency, good safety, and environmental protection.

[0005] (2) Technical solution

[0006] To achieve the above object, the present invention provides the following technical solution: a method for preparing animal manure organic fertilizer, wherein the method for preparing animal manure organic fertilizer is:

[0007] S1, collecting 200-300 parts by weight of animal feces, removing impurities therein, and then crushing the feces to a particle size of 0.5-2 mm to obtain initial material A;

[0008] S2 70-100 parts by weight of crop straw crushed to a length of 1-1.5cm, 1-2 parts by weight of a microbial agent was added thereto, stirred and mixed, and then continued to add 20-30 parts by weight of water and 3-6 parts by weight of urea, mixed to obtain an initial material B;

[0009] S3. The initial material B is stacked into a strip pile with a height of 1-1.5 m and a width of 2-3 m, and a layer of plastic film is covered on the surface of the strip pile for temperature and moisture preservation. The fermentation temperature is controlled at 50-65℃, and the pile is turned over every 2-3 days to ensure oxygen supply, promote aerobic respiration of microorganisms, and accelerate the fermentation process, thereby obtaining initial material C;

[0010] S4. The initial material C is moved to a sealed fermentation tank, and the temperature in the tank is controlled to maintain an anaerobic environment. The fermentation time is 5-7 days, thereby obtaining initial material D;

[0011] S5. The initial material D is dried to reduce the moisture content to 8-10%, and then 0.2-0.3 parts by weight of modified cyclodextrin is added. Then, the mixture is crushed and sieved with a mesh size of 2-3 mm, thereby obtaining an organic fertilizer with uniform particles.

[0012] Further, the microorganism agent in S2 is any one of Bacillus subtilis, lactic acid bacteria, and yeast.

[0013] Further, the fermentation time in S3 is 10-15 days.

[0014] Further, the temperature in the tank in S4 is 30-40℃.

[0015] Further, the preparation method of the modified cyclodextrin is as follows:

[0016] Step one: Under a nitrogen atmosphere, 3.4-3.6 g of 1-hexyl imidazole and 2.3-2.7 g of dibromoneopentyl glycol are dissolved in 50-65 mL of dimethyl sulfoxide solvent. The reaction is carried out at elevated temperature for 3-5 h. After the reaction is completed, the solvent is removed by vacuum drying. The crude product is washed with a mixed solvent of petroleum ether and tetrahydrofuran in a volume ratio of 1:4, and then dried in an oven at 30-40℃, thereby obtaining dihexyl bis-hydroxy imidazolium salt.

[0017] In the above reaction process, the tertiary amine in 1-hexyl imidazole reacts with the bromine in dibromoneopentyl glycol to form a quaternary ammonium salt group, and a hydroxyl group is introduced, thereby obtaining dihexyl bis-hydroxy imidazolium salt.

[0018] Step two: Di-hexyl bis-hydroxy imidazolium salt and acrylic acid are added to 50-60 mL of N,N-dimethylformamide solvent, and then stirred and mixed. Then, p-toluenesulfonic acid catalyst is added, and the reaction is carried out at 70-80℃ for 4-6 h. After the reaction is completed, the product is distilled under reduced pressure and washed, thereby obtaining an alkenyl imidazole.

[0019] Step three: first add 20-35 mL of cyclohexane in the reactor, then add 0.01-0.02 g of Span-80, stir until uniform, to obtain an oil phase; dissolve 6-8.4 mmol of alkenyl cyclodextrin in distilled water, add 8-10 mmol of alkenyl imidazole, 4-6 mmol of acrylamide, stir and mix, adjust the pH with 0.1 mol / L NaOH solution, then add 0.02-0.03 g of ammonium persulfate, to obtain an aqueous phase; mix the oil and water phases, magnetically stir to emulsify, heat to 45-50 DEG C, then react under nitrogen protection for 2-4 h, break the emulsion with anhydrous ethanol, then rinse with anhydrous ethanol, and then place in an oven to dry, to obtain modified cyclodextrin.

[0020] Further, the temperature of the reaction in step one is 120-130 DEG C.

[0021] Further, the ratio of the amount of dihexyl bis-hydroxy imidazolium salt, acrylic acid, and p-toluenesulfonic acid catalyst in step two is 1.1-1.3 mmol: 2-2.4 mmol: 0.01-0.02 g.

[0022] Further, the pH in step three is adjusted to 7.5-8.

[0023] (Three) beneficial technical effects

[0024] By combining the aerobic fermentation (S3 step) and anaerobic fermentation (S4 step) in stages, combining high-temperature sterilization and microbial antagonism (Bacillus subtilis, lactic acid bacteria, etc.), pathogenic bacteria, parasite eggs and weed seeds can be effectively killed. The modified cyclodextrin (S5 step) adsorbs ammonia nitrogen through the molecular cavity, reduces the loss of volatilization, and the addition of the modified cyclodextrin can improve the surface properties of the fertilizer particles, reduce the surface tension, improve the solubility and dispersibility of the fertilizer in water, increase the soil water and fertilizer retention capacity, and improve the soil fertility; the alkenyl imidazole and acrylamide copolymer form a three-dimensional network structure, which improves the water holding capacity of the fertilizer particles, and the straw is crushed to increase the soil permeability.

[0025] The quaternary ammonium salt group in the modified cyclodextrin can combine with organic matter in the organic fertilizer to form a stable complex, delay the nutrient release period, and realize long-acting fertilization. At the same time, its cationic characteristics can be adsorbed with the negatively charged soil colloids, reduce the loss of nutrients with water, improve the utilization rate of fertilizers, and improve the soil permeability and water retention.

[0026] The preparation method is simple, easy to operate, low in production cost, environmentally friendly in the preparation process, can realize the resource utilization of animal manure, and has good economic benefit and social benefit. DETAILED DESCRIPTION

[0027] Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall into the protection scope of the present application.

[0028] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in combination with specific embodiments.

[0029] The preparation method of the alkenyl cyclodextrin is as follows: a certain amount of β-CD is dissolved in NaOH water, and then a certain amount of AGE is added dropwise into the solution, and the solution gradually becomes turbid; stirring is carried out at room temperature for 10 hours until the mixed solution is clear again. Then the solution is neutralized with hydrochloric acid and filtered. Then ethanol is added to wash the solution, and the solution is filtered and distilled under reduced pressure to obtain the alkenyl cyclodextrin.

[0030] Embodiment 1

[0031] A preparation method of an animal manure organic fertilizer, comprising the following steps:

[0032] S1, collect 200 parts by weight of animal manure, remove impurities, then crush the manure to a particle size of 0.5 mm to obtain a primary material A;

[0033] S2. Crush 70 parts by weight of crop straw to a length of 1 cm, add 1 part by weight of microbial inoculum, stir and mix, then continue to add 20 parts by weight of water and 3 parts by weight of urea, and mix uniformly to obtain a primary material B;

[0034] S3. Stack the primary material B into a strip pile with a height of 1 m and a width of 2 m, cover the surface of the strip pile with a layer of plastic film for heat preservation and moisture retention, control the fermentation temperature at 50℃, turn the pile every 2 days to ensure oxygen supply, promote aerobic respiration of microorganisms, and accelerate the fermentation process, and the fermentation time is 10 days to obtain a primary material C;

[0035] S4. Move the primary material C to a sealed fermentation tank, control the temperature in the tank at 30℃, maintain an anaerobic environment, and the fermentation time is 5 days to obtain a primary material D;

[0036] S5. Dry the primary material D to reduce the moisture content to 8%, then continue to add 0.2 parts by weight of modified cyclodextrin, and then crush and sieve to obtain an organic fertilizer with uniform particles.

[0037] The preparation method of the modified cyclodextrin in S5 is as follows:

[0038] Step 1: Under a nitrogen atmosphere, 3.4 g of 1-hexylimidazole and 2.3 g of dibromoneopentyl glycol were dissolved in 50 mL of dimethyl sulfoxide solvent, and the temperature was raised to 120° C. for reaction for 3 h. After reaction, vacuum drying was performed to remove the solvent to obtain a crude product. The crude product was added to a mixed solvent of petroleum ether and tetrahydrofuran with a volume ratio of 1:4, washed, and dried in an oven at 30° C. to obtain dihexylbishydroxyimidazolium salt;

[0039] Step 2: Add 1.1 mmol of dihexylbishydroxyimidazolium salt and 2 mmol of acrylic acid to 50 mL of N,N-dimethylformamide solvent, stir and mix, then add 0.01 g of p-toluenesulfonic acid catalyst, react at 70°C for 4 hours, and then distill under reduced pressure and wash to obtain olefinated imidazole;

[0040] Step 3: First add 20mL of cyclohexane to the reactor, then add 0.01g of Span-80, stir evenly to obtain an oil phase; dissolve 6mmol of alkenyl cyclodextrin in distilled water, add 8mmol of alkenylated imidazole and 4mmol of acrylamide, stir to mix, and add 0.1mol / L NaOH solution to adjust the pH to 7.5, and then add 0.02g of ammonium persulfate to obtain an aqueous phase; mix the oil and water phases, emulsify with magnetic stirring, heat to 45°C and react under nitrogen protection for 2h, demulsify the emulsion with anhydrous ethanol, rinse with anhydrous ethanol, and put it in an oven to dry to obtain modified cyclodextrin.

[0041] Example 2

[0042] A method for preparing animal manure organic fertilizer comprises the following steps:

[0043] S1, collecting 300 parts by weight of animal feces, removing impurities therein, and then crushing the feces to a particle size of 2 mm to obtain initial material A;

[0044] S2. 100 parts by weight of crop straw was crushed to a length of 1.5 cm, 2 parts by weight of microbial agent was added thereto, stirred and mixed, and then 30 parts by weight of water and 6 parts by weight of urea were added and mixed to obtain an initial material B;

[0045] S3. The initial material B was piled into a 1.5m high and 3m wide stack, and the surface of the stack was covered with a layer of plastic film for heat preservation and moisture retention. The fermentation temperature was controlled at 65°C and the stack was turned every 3 days to ensure oxygen supply, promote aerobic respiration of microorganisms, and accelerate the fermentation process. The fermentation time was 15 days to obtain the initial material C;

[0046] S4. The initial material C was moved to a closed fermentation tank, the tank temperature was controlled at 40 ° C, an anaerobic environment was maintained, and the fermentation time was 7 days to obtain the initial material D;

[0047] S5. The initial material D is dried to reduce the moisture content to 10%, and then 0.3 parts by weight of modified cyclodextrin is added, followed by crushing and sieving with a mesh size of 3 mm to obtain an organic fertilizer with uniform granules.

[0048] The preparation method of the modified cyclodextrin in S5 is as follows:

[0049] Step one: 3.6 g of 1-hexyl imidazole and 2.7 g of dibromoneopentyl glycol are dissolved in 65 mL of dimethyl sulfoxide solvent under a nitrogen atmosphere, and the temperature is raised to 130℃ for 5 h of reaction. After the reaction is completed, the solvent is removed by vacuum drying to obtain a crude product. The crude product is washed with a mixed solvent of petroleum ether and tetrahydrofuran in a volume ratio of 1:4, and then dried in an oven at 40℃ to obtain dihexyl bis-hydroxy imidazolium salt;

[0050] Step two: 1.3 mmol of dihexyl bis-hydroxy imidazolium salt and 2.4 mmol of acrylic acid are added to 60 mL of N,N-dimethylformamide solvent, and then stirred and mixed. Then, 0.02 g of p-toluenesulfonic acid catalyst is added, and the reaction is carried out at 80℃ for 6 h. After the reaction is completed, the product is distilled under reduced pressure and washed to obtain an alkenyl imidazole;

[0051] Step three: 35 mL of cyclohexane is first added to the reactor, followed by 0.02 g of Span-80, and then stirred uniformly to obtain an oil phase. 8.4 mmol of alkenyl cyclodextrin is dissolved in distilled water, and then 10 mmol of alkenyl imidazole and 6 mmol of acrylamide are added and stirred and mixed. Then, 0.1 mol / L NaOH solution is added to adjust the pH to 8, and then 0.03 g of ammonium persulfate is added to obtain an aqueous phase. The oil and water phases are mixed and magnetically stirred to emulsify. After the temperature is raised to 50℃, the reaction is carried out under nitrogen protection for 4 h. The emulsion is broken with anhydrous ethanol, and then washed with anhydrous ethanol. Finally, the product is dried in an oven to obtain modified cyclodextrin.

[0052] Example 3

[0053] A method for preparing an animal manure organic fertilizer, comprising the following steps:

[0054] S1. 250 parts by weight of animal manure is collected, and impurities are removed. Then, the manure is crushed to a particle size of 1.6 mm to obtain an initial material A;

[0055] S2. 80 parts by weight of crop straw is crushed to a length of 1.2 cm, and then 1.5 parts by weight of microbial inoculant is added and stirred and mixed. Then, 25 parts by weight of water and 5 parts by weight of urea are added and mixed uniformly to obtain an initial material B;

[0056] S3. The initial material B was piled into a 1.3m high and 2.5m wide stack. The surface of the stack was covered with a layer of plastic film for heat preservation and moisture retention. The fermentation temperature was controlled at 60°C and the stack was turned every 2 days to ensure oxygen supply, promote aerobic respiration of microorganisms, and accelerate the fermentation process. The fermentation time was 12 days to obtain the initial material C;

[0057] S4. The initial material C was moved to a closed fermentation tank, the tank temperature was controlled at 35 ° C, an anaerobic environment was maintained, and the fermentation time was 6 days to obtain the initial material D;

[0058] S5. The initial material D is dried to reduce the moisture content to 9%, and then 0.25 parts by weight of modified cyclodextrin is added, followed by crushing and sieving with a sieve size of 2 mm to obtain uniformly granulated organic fertilizer.

[0059] The preparation method of the modified cyclodextrin in S5 is:

[0060] Step 1: Under a nitrogen atmosphere, 3.5 g of 1-hexylimidazole and 2.4 g of dibromoneopentyl glycol were dissolved in 60 mL of dimethyl sulfoxide solvent, and the temperature was raised to 125° C. for 4 h. After the reaction, vacuum drying was performed to remove the solvent to obtain a crude product. The crude product was added to a mixed solvent of petroleum ether and tetrahydrofuran with a volume ratio of 1:4, washed, and dried in an oven at 35° C. to obtain dihexylbishydroxyimidazolium salt;

[0061] Step 2: Add 1.2 mmol of dihexylbishydroxyimidazolium salt and 2.2 mmol of acrylic acid to 55 mL of N,N-dimethylformamide solvent, stir and mix, then add 0.015 g of p-toluenesulfonic acid catalyst, react at 75°C for 5 hours, and then distill under reduced pressure and wash to obtain olefinated imidazole;

[0062] Step 3: First add 30mL of cyclohexane to the reactor, then add 0.015g of Span-80, stir evenly to obtain an oil phase; dissolve 7.4mmol of alkenyl cyclodextrin in distilled water, add 8-10mmol of alkenylated imidazole and 5mmol of acrylamide, stir to mix, and add 0.1mol / L NaOH solution to adjust the pH to 7.7, and then add 0.025g of ammonium persulfate to obtain an aqueous phase; mix the oil and water phases, emulsify with magnetic stirring, heat to 47°C and react under nitrogen protection for 3h, break the emulsion with anhydrous ethanol, rinse with anhydrous ethanol, and put it in an oven to dry to obtain modified cyclodextrin.

[0063] Comparative Example 1

[0064] Compared with Example 3, this comparative example differs in that dihexylbishydroxyimidazolium salt is used instead of modified cyclodextrin.

[0065] Performance testing

[0066] Five test plots with similar soil conditions were selected and the organic fertilizer prepared in Example 3 and the organic fertilizer prepared in Comparative Example 1 were applied respectively. No fertilizer was applied as a control. Three replicates were set for each fertilizer, and the plot area was 20 m 2 The experimental crop was corn, with a planting density of 4,000 plants per mu, and other field management measures were the same.

[0067] Stem diameter: During the jointing and tasseling stages, 10 corn plants were randomly selected from each plot. The stem base diameter was measured and the average value was taken. Yield: During the maturity stage, corn was harvested individually from each plot, threshed, and weighed to calculate the yield per mu.

[0068] Table 1: Stem diameter and yield tests.

[0069] project Stem diameter at jointing stage (cm) Stem diameter at tasseling stage (cm) Yield per mu (kg) Example 1 1.75 2.1 651.8 Example 2 1.73 2.1 653.4 Example 3 1.8 2.2 660.1 Comparative Example 1 1.5 1.7 580.2 control group 1.3 1.6 521.6

[0070] As shown in Table 1, Examples 1-3 of the present invention have better stem diameter and yield than Comparative Example 1 and the control group, indicating that the fertilizer effect is good.

[0071] The fertilizers in Examples 1-3 and Comparative Example 1 were mixed with dry soil at a ratio of 0.6 wt % and placed in a PVC tube with a diameter of 4.5 cm and a length of 15 cm. The bottom of the tube was sealed with a nylon mesh (300 mesh) and weighed. The PVC tube was then suspended and soaked in deionized water for 12 hours. The tube was removed and hung vertically on a rack to allow water to flow out freely. The tube was weighed when no more water seeped out within 10 minutes. The maximum water holding capacity was calculated as follows: maximum water holding capacity = (total weight of the entire tube after wetting without water seeping out - weight of dry soil and PVC tube before wetting) / (weight of dry soil and PVC tube before wetting - weight of PVC tube) × 100%. The experimental soil was taken from the farm of the scientific research base of South China Agricultural University. The test results are shown in Table 2.

[0072] Table 2: Water retention performance test.

[0073] project Maximum water holding capacity (%) Example 1 47.2 Example 2 48.1 Example 3 48.5 Comparative Example 1 35.7 control group 20.1

[0074] As can be seen from Table 2, compared with the fertilizer in Comparative Example 1, the fertilizers in Examples 1-3 of the present invention have better water retention effects on the soil.

[0075] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0076] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

[0077] Those skilled in the art should understand that the above descriptions are only some specific embodiments of the present invention, rather than all embodiments.

Claims

1. A method for preparing animal manure organic fertilizer, characterized in that: The preparation method of the animal excrement organic fertilizer is: S1, collecting 200-300 parts by weight of animal feces, removing impurities therein, and then crushing the feces to a particle size of 0.5-2 mm to obtain initial material A; S2 70-100 parts by weight of crop straw crushed to a length of 1-1.5cm, 1-2 parts by weight of a microbial agent was added thereto, stirred and mixed, and then continued to add 20-30 parts by weight of water and 3-6 parts by weight of urea, mixed to obtain an initial material B; S3. The initial material B is piled into a 1-1.5m high and 2-3m wide stack. The surface of the stack is covered with a layer of plastic film for heat preservation and moisture retention. The fermentation temperature is controlled at 50-65 ° C. The pile is turned every 2-3 days to ensure oxygen supply, promote aerobic respiration of microorganisms, accelerate the fermentation process, and obtain the initial material C; S4. The initial material C was moved to a closed fermentation tank, the tank temperature was controlled, an anaerobic environment was maintained, and the fermentation time was 5-7 days to obtain the initial material D; S5. The initial material D is dried to reduce the moisture content to 8-10%, and then 0.2-0.3 parts by weight of modified cyclodextrin is added, followed by crushing and sieving with a sieve size of 2-3 mm to obtain uniformly granulated organic fertilizer.

2. The method for preparing animal manure organic fertilizer according to claim 1, characterized in that: The microbial agent in S2 is any one of Bacillus subtilis, lactic acid bacteria, and yeast.

3. The method for preparing animal manure organic fertilizer according to claim 1, characterized in that: The fermentation time in S3 is 10-15 days.

4. The method for preparing animal manure organic fertilizer according to claim 1, characterized in that: The temperature inside the S4 tank is 30-40°C.

5. The method for preparing animal manure organic fertilizer according to claim 1, characterized in that: The preparation method of the modified cyclodextrin is: Step 1: Under a nitrogen atmosphere, 3.4-3.6 g of 1-hexylimidazole and 2.3-2.7 g of dibromoneopentyl glycol are dissolved in 50-65 mL of dimethyl sulfoxide solvent, and the temperature is raised to react for 3-5 hours. After the reaction, vacuum drying is performed to remove the solvent to obtain a crude product. The crude product is added to a mixed solvent of petroleum ether and tetrahydrofuran with a volume ratio of 1:4, washed, and dried in an oven at 30-40°C to obtain dihexylbishydroxyimidazolium salt; Step 2: Add dihexylbishydroxyimidazolium salt and acrylic acid to 50-60 mL of N,N-dimethylformamide solvent, stir and mix, then add p-toluenesulfonic acid catalyst, react at 70-80°C for 4-6 hours, and then distill under reduced pressure and wash to obtain olefinated imidazole; Step 3: First add 20-35mL of cyclohexane to the reactor, then add 0.01-0.02g of Span-80, stir evenly to obtain an oil phase; dissolve 6-8.4mmol of alkenyl cyclodextrin in distilled water, add 8-10mmol of alkenylated imidazole and 4-6mmol of acrylamide, stir and mix, add 0.1mol / L NaOH solution to adjust the pH, and then add 0.02-0.03g of ammonium persulfate to obtain an aqueous phase; mix the oil and water phases, emulsify with magnetic stirring, heat to 45-50°C, and react under nitrogen protection for 2-4h, demulsify the emulsion with anhydrous ethanol, rinse with anhydrous ethanol, and place in an oven to dry to obtain modified cyclodextrin.

6. The method for preparing animal manure organic fertilizer according to claim 5, characterized in that: The temperature of the heating reaction in step 1 is 120-130°C.

7. The method for preparing animal manure organic fertilizer according to claim 5, characterized in that: In the step 2, the usage ratio of dihexylbishydroxyimidazolium salt, acrylic acid, and p-toluenesulfonic acid catalyst is 1.1-1.3 mmol: 2-2.4 mmol: 0.01-0.02 g.

8. The method for preparing animal manure organic fertilizer according to claim 5, characterized in that: In the step 3, the pH is adjusted to 7.5-8.