A water-rotting agent for cow dung and a preparation method thereof

Abstract

The application provides a cattle manure water rotting agent and a preparation method thereof. The cattle manure water rotting agent is obtained by mixing, fermenting and drying cattle manure and heat-retaining material immobilized rotting composite bacteria, and the heat-retaining material is a heat-generating aerogel sheet layer. The preparation method comprises the following steps: step 1, stirring and mixing the cattle manure and the heat-retaining material immobilized rotting composite bacteria, rotting treatment, composting fermentation for 10-15 days, continuously stirring during the fermentation process, and obtaining a fermentation product; and step 2, drying the fermentation product at 25-30 DEG C to obtain the cattle manure water rotting agent. The cattle manure rotting agent is obtained by mixing, fermenting and drying the cattle manure and the heat-retaining material immobilized rotting composite bacteria, has the effect of self-heating and heat preservation, can realize rapid heating fermentation at low temperature (below 0 DEG C), and can realize heat preservation rotting at the same time, so that the high-temperature period is advanced and prolonged, and the composting process is accelerated.

Description

Technical Field

[0001] This invention relates to the field of composting agents, specifically to a composting agent for cow manure and its preparation method. Background Technology

[0002] In recent years, with the sustained and stable development of my country's animal husbandry industry and the significant improvement in the level of large-scale farming, the supply of meat, eggs, and milk has been guaranteed. However, a large amount of livestock waste has not been effectively treated and utilized, which has become a major problem. Domestic and international methods for treating livestock and poultry manure mainly include: feed conversion, energy conversion, and fertilizer conversion. During the feed conversion process, a large number of pathogenic microorganisms, parasites, antibiotics, and heavy metal residues in the manure cannot be completely eliminated. Feeding these animals with this waste negatively impacts their health, leading to frequent disease outbreaks. Livestock and poultry manure energy conversion involves large initial investments, high processing costs, no profit margin, and is prone to secondary pollution. Neither of these two methods can solve livestock and poultry manure pollution on a large scale. Livestock and poultry manure fertilization transforms organic matter, pathogens, insect eggs, nematodes, weed seeds, and antibiotic residues in livestock and poultry manure into humus and plant nutrients. It offers large-scale processing, avoids secondary pollution, has low costs, wide applicability, and the resulting products can be made into high-quality fertilizer. It addresses livestock and poultry manure pollution while achieving resource utilization, making it the most economical and applicable method for livestock and poultry manure treatment. Currently, with continuous research and development, composting technology is becoming increasingly mature. The use of composting agents to accelerate the composting process and shorten the composting time is well-established. However, even with conventional composting agents, it is difficult to overcome the problems of slow heating, difficulty in maintaining temperature, and excessively long composting times under low-temperature conditions. Meanwhile, the heavy metal content in livestock and poultry manure compost has always been a concern for organic farmers and those concerned about the agricultural environment. With the continuous application of large amounts of compost year after year, the heavy metal content requires special attention. Summary of the Invention

[0003] The technical problem to be solved: The purpose of this invention is to provide a cow manure composting agent and its preparation method. The cow manure composting agent is obtained by mixing and fermenting cow manure and heat-generating and heat-insulating materials with immobilized composting compound bacteria and then drying. It has the effect of self-heating and heat preservation. It can achieve rapid heating and fermentation even at low temperatures (below 0℃) while simultaneously keeping warm and composting, thus advancing and extending the high-temperature period and accelerating the composting process.

[0004] Technical solution: A cow dung composting agent, which is obtained by mixing and fermenting cow dung and heat-generating and heat-insulating materials with immobilized composting compound bacteria and then drying them, wherein the heat-generating and heat-insulating material is a heat-generating aerogel sheet.

[0005] Furthermore, the compound bacteria are composed of the following bacterial species in parts by weight: 55-16 parts of cold-resistant short bacillus SDB, 5-10 parts of brown thermophilic schistosome, 10-20 parts of Bacillus licheniformis, 2-5 parts of thermophilic filamentous fungus, 2-5 parts of Aspergillus niger, 1-6 parts of Chaetomium, and 1-3 parts of lactic acid bacteria.

[0006] Furthermore, the preparation method of the heating aerogel sheet is as follows:

[0007] S1: Mix polyacrylonitrile and NaOH aqueous solution, heat and stir in a constant temperature oil bath and reflux to carry out hydrolysis reaction to obtain hydrolysis products;

[0008] S2: Adjust the pH of the hydrolysis product to 4, add 3-5 times the weight of the bacterial cellulose and deionized water, and stir for 10-20 minutes.

[0009] S3: Add crosslinking agent and stir for 5-6 hours;

[0010] S4: Pour into a mold and freeze-dry to obtain a porous thermal insulation aerogel;

[0011] S5: Place the porous thermal insulation aerogel in an oven and crosslink it at 150°C for 5 minutes to obtain a heating aerogel sheet.

[0012] Furthermore, in S1, the mass ratio of polyacrylonitrile to NaOH in the NaOH aqueous solution is 1:1, and the concentration of the NaOH aqueous solution is 7-9%.

[0013] Furthermore, the heating temperature is 95-105℃, and the hydrolysis time is 3 hours.

[0014] Furthermore, the amount of crosslinking agent added in S3 is 10-20% of the dry weight of bacterial cellulose, and the crosslinking agent is butanetetracarboxylic acid and sodium hypophosphite in a mass ratio of 1:1.

[0015] Furthermore, the preparation method of the immobilized composted composite bacteria of the heat-generating and heat-insulating material is as follows: after mixing the composite bacteria with the culture solution, pour it into a culture dish containing a heat-generating aerogel sheet, stir for 1-2 hours, so that the composite bacteria are adsorbed and fixed on the heat-generating aerogel sheet, and thus the composite bacteria are obtained. The mass ratio of the composite bacteria to the heat-generating aerogel sheet is 1:(20-30).

[0016] Furthermore, the effective viable count of the immobilized composted composite bacteria in the heat-generating and heat-insulating material is ≥5.5 billion / g.

[0017] The preparation method of the above-mentioned cow manure composting agent includes the following steps:

[0018] Step 1: Mix cow dung and heating insulation material with immobilized composting bacteria, compost for 10-15 days, stirring continuously during the fermentation process to obtain the fermentation product;

[0019] Step 2: Dry the fermentation product at 25-30℃ to obtain the cow manure composting agent.

[0020] Furthermore, in step 1, the mass ratio of cow dung to the immobilized composting composite bacteria in the heating and insulation material is 1:(2-3).

[0021] Beneficial effects:

[0022] 1. This invention uses a cow manure composting agent obtained by mixing and fermenting cow manure with heat-generating and heat-insulating materials and immobilized composting bacteria, followed by drying. It has the effect of self-heating and heat preservation, and can achieve rapid heating and fermentation even at low temperatures (below 0℃), while simultaneously performing heat preservation and composting, thus advancing and extending the high-temperature period and accelerating the composting process.

[0023] 2. The heating and heat-insulating material used in this invention is a heating aerogel sheet. The aerogel contains polyacrylonitrile hydrolysis products, which contain a large number of hydrophilic groups such as carboxyl groups, and have a significant exothermic effect. When the heating aerogel sheet comes into contact with the cow manure to be fermented, it absorbs water and generates heat, causing the temperature to rise. This overcomes the initial low temperature environment, allowing the composting bacteria to grow and ferment rapidly. At the same time, the porous structure of the aerogel sheet can insulate it, and the composting bacteria are fixed on it, maintaining the temperature and keeping the temperature rise of the composting cow manure, minimizing the influence of ambient temperature, thereby accelerating the composting process.

[0024] 3. In the preparation of aerogel sheets, this invention also adds butanetetracarboxylic acid. Butanetetracarboxylic acid has multiple carboxylic acid groups, which can undergo esterification crosslinking with the hydroxyl groups on the surface of bacterial cellulose under the catalysis of sodium hypophosphite. Multiple crosslinking points can be formed after a short period of high temperature, which effectively increases the mechanical properties and structural stability of the aerogel, thus facilitating recycling and reuse. Fixing the composted compound bacteria on it is also for the purpose of effective recycling and reuse in the later stage.

[0025] 4. The aerogel used in this invention has a porous structure and various active groups on its surface, which can effectively adsorb heavy metal ions in cow manure, thereby solving the problem of heavy metal content in cow manure compost.

[0026] 5. The composting bacteria used in this invention are a compound bacteria, including cold-resistant short bacillus SDB5, which plays an important role in the early low-temperature fermentation, as well as thermophilic bacteria such as brown thermophilic schistosome and thermophilic pyriformis, which play an important role in the later high-temperature composting environment. At the same time, Bacillus licheniformis, Chaetomium, etc. are also added, which can effectively decompose the cellulose rich in cow manure. The combination of multiple bacteria achieves the best composting effect. Detailed Implementation

[0027] Example 1

[0028] The preparation method of the heating aerogel sheet is as follows:

[0029] S1: Mix polyacrylonitrile and a 7% NaOH aqueous solution, heat to 95°C in a constant temperature oil bath and stir, then reflux for 3 hours to obtain the hydrolysis product; the mass ratio of NaOH in the polyacrylonitrile and NaOH aqueous solution is 1:1; S2: Adjust the pH of the hydrolysis product to 4, add 3 times the weight of the polyacrylonitrile bacterial cellulose and deionized water, and stir for 10 minutes; S3: Add 15% of the dry weight of the bacterial cellulose crosslinking agent, which is butanetetracarboxylic acid and sodium hypophosphite in a mass ratio of 1:1, and stir for 5 hours;

[0030] S4: Pour into a mold and freeze-dry to obtain a porous thermal insulation aerogel;

[0031] S5: Place the porous thermal insulation aerogel in an oven and crosslink it at 150°C for 5 minutes to obtain a heating aerogel sheet.

[0032] Example 2

[0033] The preparation method of the heating aerogel sheet is as follows:

[0034] S1: Mix polyacrylonitrile and a 7% NaOH aqueous solution, heat to 100℃ in a constant temperature oil bath and stir, then reflux for 3 hours to obtain the hydrolysis product; the mass ratio of NaOH in the polyacrylonitrile and NaOH aqueous solution is 1:1; S2: Adjust the pH of the hydrolysis product to 4, add 4 times the weight of the polyacrylonitrile bacterial cellulose and deionized water, and stir for 15 minutes; S3: Add 15% of the dry weight of the bacterial cellulose crosslinking agent, which is butanetetracarboxylic acid and sodium hypophosphite in a mass ratio of 1:1, and stir for 5.5 hours;

[0035] S4: Pour into a mold and freeze-dry to obtain a porous thermal insulation aerogel;

[0036] S5: Place the porous thermal insulation aerogel in an oven and crosslink it at 150°C for 5 minutes to obtain a heating aerogel sheet.

[0037] Example 3

[0038] The preparation method of the heating aerogel sheet is as follows:

[0039] S1: Mix polyacrylonitrile and an 8% NaOH aqueous solution, heat to 100℃ in a constant temperature oil bath and stir, then reflux for 3 hours to obtain the hydrolysis product; the mass ratio of NaOH in the polyacrylonitrile and NaOH aqueous solution is 1:1; S2: Adjust the pH of the hydrolysis product to 4, add 5 times the weight of the polyacrylonitrile bacterial cellulose and deionized water, and stir for 15 minutes; S3: Add 15% of the dry weight of the bacterial cellulose crosslinking agent, which is butanetetracarboxylic acid and sodium hypophosphite in a mass ratio of 1:1, and stir for 5.5 hours;

[0040] S4: Pour into a mold and freeze-dry to obtain a porous thermal insulation aerogel;

[0041] S5: Place the porous thermal insulation aerogel in an oven and crosslink it at 150°C for 5 minutes to obtain a heating aerogel sheet.

[0042] Example 4

[0043] The preparation method of the heating aerogel sheet is as follows:

[0044] S1: Mix polyacrylonitrile and an 8% NaOH aqueous solution, heat to 100℃ in a constant temperature oil bath and stir, then reflux for 3 hours to obtain the hydrolysis product; the mass ratio of NaOH in the polyacrylonitrile and NaOH aqueous solution is 1:1; S2: Adjust the pH of the hydrolysis product to 4, add 4 times the weight of the polyacrylonitrile bacterial cellulose and deionized water, and stir for 15 minutes; S3: Add 10% of the dry weight of the bacterial cellulose crosslinking agent, which is butanetetracarboxylic acid and sodium hypophosphite in a mass ratio of 1:1, and stir for 6 hours;

[0045] S4: Pour into a mold and freeze-dry to obtain a porous thermal insulation aerogel;

[0046] S5: Place the porous thermal insulation aerogel in an oven and crosslink it at 150°C for 5 minutes to obtain a heating aerogel sheet.

[0047] Example 5

[0048] The preparation method of the heating aerogel sheet is as follows:

[0049] S1: Mix polyacrylonitrile and a 9% NaOH aqueous solution, heat to 105℃ in a constant temperature oil bath and stir, then reflux for 3 hours to obtain the hydrolysis product; the mass ratio of NaOH in the polyacrylonitrile and NaOH aqueous solution is 1:1; S2: Adjust the pH of the hydrolysis product to 4, add 4 times the weight of the polyacrylonitrile bacterial cellulose and deionized water, and stir for 15 minutes; S3: Add 20% of the dry weight of the bacterial cellulose crosslinking agent, which is butanetetracarboxylic acid and sodium hypophosphite in a mass ratio of 1:1, and stir for 6 hours;

[0050] S4: Pour into a mold and freeze-dry to obtain a porous thermal insulation aerogel;

[0051] S5: Place the porous thermal insulation aerogel in an oven and crosslink it at 150°C for 5 minutes to obtain a heating aerogel sheet.

[0052] Specific surface area determination: The specific surface area was measured using an adsorption analyzer;

[0053] Calculate the porosity based on the mass and density of the heating aerogel sheets;

[0054] Thermal conductivity determination: Thermal conductivity was tested using a transient planar heat source thermal conductivity meter under the following conditions: heating power 50mW and heating time 20s.

[0055] Determination of compressive strength: The compressive strength of the aerogel at 50% strain was tested at a loading rate of 15 mm / min.

[0056] Table 1

[0057] Porosity (%) <![CDATA[Specific surface area (m 2 / g)]]> Thermal conductivity (W / (m·K)) Compressive strength (MPa) Example 1 87.3 32.4 0.029 3.14 Example 2 90.1 33.1 0.025 3.06 Example 3 92.4 34.2 0.022 2.95 Example 4 91.9 33.5 0.023 3.01 Example 5 88.7 32.8 0.028 3.11

[0058] After comprehensively comparing the thermal insulation performance and mechanical strength of the heating aerogel sheet, Examples 2 and 4 were selected for subsequent tests.

[0059] Example 6

[0060] The preparation method of the immobilized composted compound bacteria of the heat-generating and heat-insulating material is as follows: after mixing the compound bacteria with the culture medium, pour it into a culture dish containing a heat-generating aerogel sheet and stir for 1.5 hours to allow the compound bacteria to be adsorbed and fixed on the heat-generating aerogel sheet prepared in Example 2, thereby obtaining the compound bacteria. The mass ratio of the compound bacteria to the heat-generating aerogel sheet is 1:20.

[0061] The compound bacteria consist of the following bacterial strains in parts by weight: 510 parts of cold-resistant short bacilli SDB, 8 parts of brown thermophilic schistosomes, 15 parts of Bacillus licheniformis, 3 parts of thermophilic filamentous fungi, 4 parts of Aspergillus niger, 3 parts of Chaetomium, and 2 parts of lactic acid bacteria.

[0062] Example 7

[0063] The preparation method of the immobilized composted compound bacteria of the heat-generating and heat-insulating material is as follows: after mixing the compound bacteria with the culture medium, pour it into a culture dish containing a heat-generating aerogel sheet and stir for 1.5 hours to allow the compound bacteria to be adsorbed and fixed on the heat-generating aerogel sheet prepared in Example 2, thereby obtaining the product. The mass ratio of the compound bacteria to the heat-generating aerogel sheet is 1:26.

[0064] The compound bacteria consist of the following bacterial strains in parts by weight: 510 parts of cold-resistant short bacilli SDB, 8 parts of brown thermophilic schistosomes, 15 parts of Bacillus licheniformis, 3 parts of thermophilic filamentous fungi, 4 parts of Aspergillus niger, 3 parts of Chaetomium, and 2 parts of lactic acid bacteria.

[0065] Example 8

[0066] The preparation method of the immobilized composted compound bacteria of the heat-generating and heat-insulating material is as follows: after mixing the compound bacteria with the culture medium, pour it into a culture dish containing a heat-generating aerogel sheet and stir for 1.5 hours to allow the compound bacteria to be adsorbed and fixed on the heat-generating aerogel sheet prepared in Example 2, thereby obtaining the product. The mass ratio of the compound bacteria to the heat-generating aerogel sheet is 1:30.

[0067] The compound bacteria consist of the following bacterial strains in parts by weight: 510 parts of cold-resistant short bacilli SDB, 8 parts of brown thermophilic schistosomes, 15 parts of Bacillus licheniformis, 3 parts of thermophilic filamentous fungi, 4 parts of Aspergillus niger, 3 parts of Chaetomium, and 2 parts of lactic acid bacteria.

[0068] Example 9

[0069] The preparation method of the immobilized composted compound bacteria of the heat-generating and heat-insulating material is as follows: after mixing the compound bacteria with the culture medium, pour it into a culture dish containing a heat-generating aerogel sheet and stir for 1.5 hours to allow the compound bacteria to be adsorbed and fixed on the heat-generating aerogel sheet prepared in Example 4, thereby obtaining the product. The mass ratio of the compound bacteria to the heat-generating aerogel sheet is 1:26.

[0070] The compound bacteria consist of the following bacterial strains in parts by weight: 510 parts of cold-resistant short bacilli SDB, 8 parts of brown thermophilic schistosomes, 15 parts of Bacillus licheniformis, 3 parts of thermophilic filamentous fungi, 4 parts of Aspergillus niger, 3 parts of Chaetomium, and 2 parts of lactic acid bacteria.

[0071] The loading rate and effective viable count of the composted compound bacteria on the heat-generating and heat-insulating material were determined, and the results are shown in Table 2.

[0072] Table 2

[0073] Load rate (%) Effective viable bacteria count (100 million / g) Example 6 68.4 56.4 Example 7 68.2 56.4 Example 8 67.2 56.0 Example 9 67.9 56.3

[0074] From an economic perspective, Example 7 was selected for subsequent testing.

[0075] Example 10

[0076] A method for preparing a cow manure composting agent includes the following steps:

[0077] Step 1: Mix cow dung with the immobilized composting compound bacteria of the heating and heat insulation material prepared in Example 7. The mass ratio of cow dung to immobilized composting compound bacteria of the heating and heat insulation material is 1:2. Perform composting treatment and compost fermentation for 15 days. Stir continuously during the fermentation process to obtain the fermentation product.

[0078] Step 2: Dry the fermentation product at 25°C to obtain the cow manure composting agent.

[0079] Example 11

[0080] A method for preparing a cow manure composting agent includes the following steps:

[0081] Step 1: Mix cow dung with the immobilized composting compound bacteria of the heating and heat insulation material prepared in Example 7. The mass ratio of cow dung to immobilized composting compound bacteria of the heating and heat insulation material is 1:3. Perform composting treatment and compost fermentation for 15 days. Stir continuously during the fermentation process to obtain the fermentation product.

[0082] Step 2: Dry the fermentation product at 25°C to obtain the cow manure composting agent.

[0083] Example 12

[0084] After dehydrating the cow manure water, it was pre-sun-dried to a moisture content of 60% to obtain pretreated cow manure. Under low temperature conditions (temperature below 0°C, the temperature in this experiment was around -1°C), the cow manure water composting agent prepared in Example 10 was added. The amount of cow manure water composting agent added was 0.4% of the pretreated cow manure. The mixture was stirred evenly and fermented for 16 days.

[0085] Example 13

[0086] After dehydrating the cow manure water, it was pre-sun-dried to a moisture content of 60% to obtain pretreated cow manure. Under low temperature conditions (temperature below 0°C, the temperature in this experiment was around -1°C), the cow manure water composting agent prepared in Example 11 was added. The amount of cow manure water composting agent added was 0.4% of the pretreated cow manure. The mixture was stirred evenly and fermented for 16 days.

[0087] Comparative Example 1

[0088] After dehydrating the cow manure water, it was pre-sun-dried to a moisture content of 60% to obtain pre-treated cow manure. Under low temperature conditions (temperature below 0°C, the temperature in this experiment was around -1°C), the same amount of composting compound bacteria as in Example 12 was added, mixed evenly, and fermented for 18 days, which was extended to 26 days.

[0089] The temperature of the cow dung pile was measured every two days using a thermometer. The measuring points were taken at the perimeter and center of the pile, with a depth of 25 cm. The average value of the five points was taken as the temperature of the cow dung pile.

[0090] Seed germination index (GI): Fermenting cow manure was collected on days 3, 7, and 14 of Examples 12 and 13, and on days 7, 14, 21, and 26 of Comparative Example 1. The cow manure was filtered, and 10 mL of the supernatant was placed in a petri dish lined with filter paper. Twenty cucumber seeds were placed in each petri dish. A control (deionized water) was also included. The dishes were then incubated at 25°C for 48 hours. Germination rate and root length were measured. Each sample was repeated three times, and the germination index was calculated using the following formula:

[0091]

[0092] Determination of heavy metals Cd, Zn, Pb, and Cu in the sample: The determination was carried out according to the national standard method.

[0093] Table 3 Temperature of cow dung pile

[0094] Example 12 Example 13 Comparative Example 1 Day 2 48.8 49.6 28.4 Day 4 59.6 60.4 30.3 Day 6 63.6 65.8 46.7 Day 8 63.8 66.4 46.3 Day 10 66.7 68.4 49.8 Day 12 68.2 68.5 55.4 Day 14 65.2 64.9 56.9 Day 16 59.3 60.2 53.7 Day 18 - - 51.9 Day 20 - - 52.6 Day 22 - - 46.2 Day 24 - - 37.1 Day 26 - - 22.3

[0095] Temperature is a marker of microbial activity during composting and a direct indicator of composting speed and maturity. Maintaining a temperature above 50°C for 5-7 days is crucial for killing pathogenic microorganisms in the compost, ensuring the compost meets hygienic standards, and guaranteeing proper composting maturity. Table 3 shows that Examples 12 and 13, even at low temperatures (around -1°C in this experiment), maintained a rapid temperature rise and good temperature control, reaching approximately 50°C by the second day and remaining above 50°C from the fourth day until the end of fermentation. In contrast, Comparative Example 1 only began to rise to around 50°C on the tenth day (before reaching 50°C), and the temperature could not rise further after reaching 56.9°C, starting to drop after eight days. Therefore, the cow manure composting agent of this invention can achieve rapid temperature rise at low temperatures, advance and extend the high-temperature period, and accelerate the composting process.

[0096] Table 4 Seed germination index

[0097] Example 12 Example 13 Comparative Example 1 Day 3 31.4 31.2 - Day 7 60.1 62.4 22.3 Day 14 90.3 92.6 50.7 Day 21 - - 80.3 Day 26 - - 80.9

[0098] When uncomposted cow manure is applied to plants, it produces certain toxic substances, thereby inhibiting plant growth and development. When the seed germination index (GI) reaches 80%, the composted cow manure can be considered non-toxic or truly composted. Table 4 shows that the seed germination index consistently increases throughout the composting process, and the seed germination indices of Examples 12 and 13 are significantly higher than those of Comparative Example 1. At the end of composting, the seed germination indices of Examples 12 and 13 reach over 90%, while the seed germination index of Comparative Example 1 just exceeds 80%. This demonstrates that the cow manure of the present invention is more thoroughly composted.

[0099] Table 5

[0100] Example 12 Example 13 Comparative Example 1 <![CDATA[Cd 2+ (mg / kg)]]> Not detected Not detected Not detected <![CDATA[Zn 2+ (mg / kg)]]> 155.2 173.4 521.6 <![CDATA[Pb 2+ (mg / kg)]]> Not detected Not detected Not detected <![CDATA[Cu 2+ (mg / kg)]]> 7.9 5.4 153.6

[0101] The above embodiments are provided to clearly and completely describe the technical solution and represent some, but not all, implementations of the present invention. However, the implementations of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention should be considered equivalent substitutions and are included within the protection scope of the present invention.

Claims

1. A water sludge composting agent for cattle manure, characterized by comprising: It is obtained by mixing and fermenting cow dung and heat-insulating material with immobilized composting bacteria, followed by drying. The heat-insulating material is a heat-insulating aerogel sheet. ​ The method for preparing the heating aerogel sheet is as follows: S1: Mix polyacrylonitrile and NaOH aqueous solution, heat and stir in a constant temperature oil bath and reflux to carry out hydrolysis reaction to obtain hydrolysis products; S2: Adjust the pH of the hydrolysis product to 4, add 3-5 times the weight of the bacterial cellulose and deionized water, and stir for 10-20 minutes. S3: Add crosslinking agent and stir for 5-6 hours; S4: Pour into a mold and freeze-dry to obtain a porous thermal insulation aerogel; S5: Place the porous thermal insulation aerogel in an oven and crosslink it at 150°C for 5 minutes to obtain the heating aerogel sheet. The compound bacteria consist of the following bacterial species in parts by weight: 55-16 parts of cold-resistant short bacillus SDB, 5-10 parts of brown thermophilic schistosome, 10-20 parts of Bacillus licheniformis, 2-5 parts of thermophilic filamentous fungus, 2-5 parts of Aspergillus niger, 1-6 parts of Chaetomium, and 1-3 parts of lactic acid bacteria.

2. The dung water decomposing agent according to claim 1, characterized in that: In S1, the mass ratio of polyacrylonitrile to NaOH in the NaOH aqueous solution is 1:1, and the concentration of the NaOH aqueous solution is 7-9%.

3. The dung water decomposing agent according to claim 1, characterized in that: The heating temperature is 95-105℃, and the hydrolysis time is 3 hours.

4. The dung water decomposing agent according to claim 1, characterized by: The amount of crosslinking agent added in S3 is 10-20% of the dry weight of bacterial cellulose, and the crosslinking agent is butanetetracarboxylic acid and sodium hypophosphite in a mass ratio of 1:

1.

5. The dung water decomposing agent according to claim 1, characterized in that: The method for preparing the immobilized composted composite bacteria of the heat-generating and heat-insulating material is as follows: after mixing the composite bacteria with the culture solution, pour it into a culture dish containing a heat-generating aerogel sheet and stir for 1-2 hours to allow the composite bacteria to be adsorbed and fixed on the heat-generating aerogel sheet, and thus obtain the product. The mass ratio of the composite bacteria to the heat-generating aerogel sheet is 1:(20-30).

6. The dung water decomposing agent according to claim 1, characterized in that: The effective viable count of the immobilized composted composite bacteria in the heat-generating and heat-insulating material is ≥5.5 billion / g.

7. A method for preparing a cow manure composting agent according to any one of claims 1-6, characterized in that: Includes the following steps: Step 1: Mix cow dung and heating insulation material with immobilized composting bacteria, compost for 10-15 days, stirring continuously during the fermentation process to obtain the fermentation product; Step 2: Dry the fermentation product at 25-30℃ to obtain the cow manure composting agent.

8. The method for preparing a cow manure composting agent according to claim 7, characterized in that: In step 1, the mass ratio of cow dung to immobilized composting bacteria in heating and insulation materials is 1:(2-3).

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