Method for intensifying aerobic composting through combination of nano-film and biochar

Abstract

The invention provides a method for strengthening aerobic composting by combining a nano film and biochar, which comprises the following steps: mixing livestock and poultry manure and straw, and adding water and a microbial inoculum to obtain a composting raw material; mixing the composting raw material with biochar, and placing the mixture in a composting container to form a compost body; and covering the pile body with a nano film for aerobic composting, and carrying out regular aeration and pile turning to obtain the final compost. The method for strengthening aerobic composting by combining the nano-film and the charcoal is simple and convenient, the composting temperature rise speed is high, the heat preservation time is long, the decomposition period is short, and the fertilizer efficiency of the product is strong.

Description

Technical Field

[0001] The present application relates to the field of composting technology, and in particular to a method for enhancing aerobic composting by combining nanofilm and biochar. Background Art

[0002] With the high-quality development of my country's economy and the pursuit of a better life, people's demand for meat and grain has increased. In 2022, meat production will reach 90 million tons, and the growth rate in the past two years may exceed 2.6%; the average annual output of grain in the past ten years is about 660 million tons, and it shows an increasing trend year by year. As a result, the rapid development of livestock and poultry breeding and planting industries will inevitably bring a large amount of organic waste.

[0003] The resource utilization of agricultural waste is guaranteed by the technical model. Based on the "3R" principle, my country has basically formed a pattern of comprehensive utilization of agricultural waste such as livestock and poultry manure and grain straw - "five materials". From the perspective of technical cost, processing volume, farmers' acceptance, ecological environment, etc., converting agricultural waste resources into fertilizer through composting and returning it to the field is currently a more suitable technical model for rural areas. However, at this stage, there are still many technical problems that need to be solved in aerobic composting in my country, such as backward composting fermentation equipment, low degree of automation, large area of ​​composting plants, and high deodorization costs. These factors have formed the main limiting conditions for the resource utilization of livestock and poultry manure, restricting the rapid development of my country's composting industry.

[0004] At present, the main aerobic composting processes in my country include pile-type, trough-type and reactor-type composting. According to the ventilation method, pile-type composting is divided into strip-type and static ventilation pile-type. The strip-type system is to pile the mixture of straw and feces into a narrow and long pile, and maintain ventilation and oxygen supply through mechanical turning; the static ventilation pile is to pile the fermented raw materials into a pile, and then ventilate the pile through aeration equipment such as blowers and ventilation pipes. Pile-type aerobic fermentation is a typical open aerobic fermentation, with simple operation methods, low investment, low operating costs, low degree of mechanization, and no need to build a special factory building, but it occupies a large area and will be affected by the weather. The odor generated is almost not collected, which is easy to cause secondary pollution to the surrounding environment. Aerobic composting should increase the high temperature period, shorten the decomposition cycle, reduce carbon and nitrogen losses, and achieve harmless composting for the rural ecological environment and human living environment.

[0005] Therefore, an aerobic composting method is urgently needed to overcome the problems of slow heating rate, short insulation time, long decomposition cycle and poor fertilizer efficiency of the current traditional composting. Summary of the invention

[0006] In view of this, the purpose of the present application is to propose a method for strengthening aerobic composting by combining nanofilm and biochar to solve the related problems mentioned in the background technology.

[0007] Based on the above purpose, the present application provides a method for strengthening aerobic composting by combining nanofilm and biochar, comprising: mixing livestock and poultry manure and straw, and adding water and bacterial agent to obtain compost raw materials; mixing the compost raw materials with biochar, and placing them in a composting container to form a pile body; covering the pile body with a nanofilm for aerobic composting, and regularly aerating and turning the pile to obtain the final compost.

[0008] Furthermore, the livestock and poultry manure is one or more of pig manure, cow manure, chicken manure and sheep manure, the straw is one or more of corn straw, rice straw, sorghum straw and wheat straw, and the mass ratio of the livestock and poultry manure to the straw is (1-3):1.

[0009] Furthermore, the mixing of livestock and poultry manure and straw includes: crushing the straw into 3cm to 5cm.

[0010] Furthermore, the bacterial agent is a composting bacterial agent, the mass percentage of the bacterial agent to the compost raw material is 0.01% to 0.05%, and the moisture content of the compost raw material is 55% to 65%.

[0011] Furthermore, the biochar is a carbonaceous material formed by carbonizing one or more substances selected from wood, coconut shell, bamboo and crop straw, and the mass ratio of the biochar to the compost raw material is (5-10):100.

[0012] Furthermore, the nano-membrane comprises an outer polyester film and an inner expanded polytetrafluoroethylene film, and the micropore diameter of the nano-membrane is 0.15nm to 0.35nm.

[0013] Furthermore, the aeration includes: performing periodic aeration using a silent air pump, the aeration cycle of the silent air pump is set to 5 minutes on and 55 minutes off, the exhaust volume of the silent air pump is 3.5L / min, and the power of the silent air pump is 3.0W.

[0014] Furthermore, the turning of the pile includes: spreading the surface pile of the pile, shaking out the wet and hot pile in the middle and placing it around the bottom layer of the pile, and then placing the dry and cold pile in the middle of the top of the pile, and repeating the operation at regular intervals.

[0015] Furthermore, the repeated operation at certain intervals includes: when the average temperature of the pile is greater than 55°C, the composting is performed once every 2 days; when the average temperature of the pile is greater than or equal to 35°C and less than or equal to 55°C, the composting is performed once every 5 days; when the average temperature of the pile is less than 35°C, the composting is performed once every 7 days.

[0016] Furthermore, the repeated operation at regular intervals includes: performing the composting once on the 3rd day, the 5th day, the 7th day, the 9th day, the 14th day, the 21st day and the 28th day of the aerobic composting.

[0017] From the above, it can be seen that the method of aerobic composting strengthened by combining nanofilm and biochar provided in the present application includes: mixing livestock and poultry manure and straw, and adding water and bacterial agent to obtain compost raw materials; mixing the compost raw materials with biochar, and placing them in a compost container to form a pile; covering the pile with a nanofilm for aerobic composting, and regularly aerating and turning the pile to obtain the final compost. During the composting process, the nanofilm isolates the influence of the external environment on the maturity of the pile, and can increase the temperature of the pile in a short time; at the same time, because it blocks the discharge of most greenhouse gases, the pressure in the pile increases, thereby promoting the uniform distribution of oxygen and enhancing the aerobic effect. The biochar used has a large specific surface area and adsorption capacity, which can maintain the water content in the pile, and provide attachment sites for microorganisms to enhance the degradation of organic matter. After testing, the combined use of nanofilm and biochar for aerobic composting has significantly enhanced the composting effect compared to the use of nanofilm or biochar alone. The combined use of the two has an enhancing effect in extending the high temperature period and increasing the intensity of the composting process. In terms of the composting cycle, the combined aerobic composting of nanofilm and biochar can complete decomposition within 28 days, greatly shortening the composting time. During the high temperature period, the combined use can keep the pH of the pile stable, providing an environment for microorganisms to maintain life activities. The method of combining nanofilm and biochar to enhance aerobic composting is simple and convenient, with fast compost heating speed, long heat preservation time, short decomposition cycle, and strong fertilizer effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present application or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 This is a schematic diagram of a process for strengthening aerobic composting by combining nanofilm and biochar in an embodiment of the present application;

[0020] Figure 2 The temperature change curve of aerobic composting in the embodiment of the present application and the comparative example;

[0021] Figure 3 The graph is a pH change curve of aerobic composting in the examples of the present application and the comparative example. DETAILED DESCRIPTION

[0022] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in conjunction with specific embodiments.

[0023] It should be noted that, unless otherwise defined, the technical terms used in the following examples have the same meanings as those generally understood by those skilled in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods, unless otherwise specified, are all conventional methods.

[0024] With the high-quality development of my country's economy and the pursuit of a better life, people's demand for meat and grain has increased. In 2022, meat production will reach 90 million tons, and the growth rate in the past two years may exceed 2.6%; the average annual output of grain in the past decade is about 660 million tons, and it shows an increasing trend year by year. As a result, the rapid development of livestock and poultry farming and planting industries will inevitably bring a large amount of organic waste. It is estimated that the country produces more than 3.8 billion tons of livestock and poultry manure each year, and the comprehensive utilization rate is less than 70%; nearly 1.273 billion tons of grain straw are produced each year, and the unused part is about 20%.

[0025] The resource utilization of agricultural waste is guaranteed by the technical model. Based on the "3R" principle, my country has basically formed a pattern of comprehensive utilization of agricultural waste such as livestock and poultry manure and grain straw - "five materials". From the perspective of technical cost, processing volume, farmers' acceptance, ecological environment, etc., converting agricultural waste resources into fertilizer through composting and returning it to the field is currently a more suitable technical model for rural areas. However, at this stage, there are still many technical problems that need to be solved in aerobic composting in my country, such as backward composting fermentation equipment, low degree of automation, large area of ​​composting plants, and high deodorization costs. These factors have formed the main limiting conditions for the resource utilization of livestock and poultry manure, restricting the rapid development of my country's composting industry.

[0026] At present, the main aerobic composting processes in my country include pile-type, trough-type and reactor-type composting. According to the ventilation method, pile-type composting is divided into strip-type and static ventilation pile-type. The strip-type system is to pile the mixture of straw and feces into a narrow and long pile, and maintain ventilation and oxygen supply through mechanical turning; the static ventilation pile is to pile the fermented raw materials into a pile and ventilate the pile through aeration equipment such as blowers and ventilation pipes. Pile-type aerobic fermentation is a typical open aerobic fermentation, with simple operation methods, low investment, low operating costs, low degree of mechanization, and no need to build a special factory building, but it occupies a large area and will be affected by the weather. The odor generated is almost not collected, which is easy to cause secondary pollution to the surrounding environment. Under the background of "carbon neutrality and carbon peak", aerobic composting should increase the high temperature period, shorten the decomposition cycle, reduce carbon and nitrogen losses, and achieve harmless composting for the rural ecological environment and human living environment.

[0027] Therefore, an aerobic composting method is urgently needed to overcome the problems of slow heating rate, short insulation time, long decomposition cycle and poor fertilizer efficiency of the current traditional composting.

[0028] Below, through specific embodiments and combined Figures 1 to 3 To describe the technical solution of this application in detail.

[0029] In some embodiments of the present application, a method for enhancing aerobic composting by combining nanofilm and biochar is provided, such as Figure 1 As shown, the following steps are included:

[0030] S1. Mix livestock and poultry manure and straw, and add water and bacterial agent to obtain compost raw materials.

[0031] The livestock and poultry manure is one or more of pig manure, cow manure, chicken manure and sheep manure, for example, a mixture of pig manure and cow manure, etc., without specific limitation; the straw is one or more of corn straw, rice straw, sorghum straw and wheat straw, for example, a mixture of corn straw and rice straw, etc., without specific limitation; the mass ratio of livestock and poultry manure and straw is (1-3):1, and the mass ratio is, for example, 1:1, 2:1 or 3:1, etc., without specific limitation; different types of livestock and poultry manure and straw are adjusted according to a carbon-nitrogen ratio of 25:1; before mixing the livestock and poultry manure and straw, the straw needs to be crushed to 3cm-5cm, for example, 3cm, 4cm or 5cm, etc., without specific limitation.

[0032] The microbial agent is a composting microbial agent, for example, it is composed of microorganisms such as Bacillus subtilis, Bacillus laterosporus, yeast, etc.; the mass percentage of the microbial agent to the compost raw material is 0.01% to 0.05%, and the mass percentage is, for example, 0.01%, 0.02%, 0.03%, 0.04% or 0.05%, etc., without specific limitation; the moisture content of the compost raw material is 55% to 65%, and the moisture content is, for example, 55%, 60% or 65%, etc., without specific limitation.

[0033] S2. Mixing the compost raw material with biochar and placing the biochar in a compost container to form a pile.

[0034] Biochar is a carbonaceous material formed by high-temperature anoxic carbonization of one or more organic substances in wood, coconut shells, bamboo and crop straw. The mass ratio of biochar to the compost raw material is (5-10):100, and the mass ratio is, for example, 5:100, 7:100 or 10:100, etc., without specific limitation; the compost container is, for example, a compost barrel.

[0035] S3, covering the pile with a nanofilm for aerobic composting, and regularly aerating and turning the pile to obtain final compost.

[0036] The nano-membrane includes an outer polyester film and an inner expanded polytetrafluoroethylene film. The micropore diameter of the nano-membrane is 0.15nm to 0.35nm. The micropore diameter is, for example, 0.15nm, 0.2nm, 0.25nm, 0.3nm or 0.35nm, etc., and is not specifically limited.

[0037] Aeration includes periodic aeration using a silent air pump. The aeration cycle of the silent air pump is set to 5 minutes on and 55 minutes off. The exhaust volume of the silent air pump is 3.5L / min, and the power of the silent air pump is 3.0W.

[0038] Turning the pile includes digging up the surface of the pile, shaking out the hot and wet material in the middle and placing it around the bottom layer of the pile, and then placing the dry and cold material in the middle of the top of the pile, repeating the operation at regular intervals.

[0039] The operation is repeated at regular intervals, for example, including: when the average temperature of the pile is greater than 55°C, composting is carried out every 2 days; when the average temperature of the pile is greater than or equal to 35°C and less than or equal to 55°C, composting is carried out every 5 days; when the average temperature of the pile is less than 35°C, composting is carried out every 7 days; or, the operation is repeated at regular intervals including: composting is carried out on the 3rd, 5th, 7th, 9th, 14th, 21st and 28th day of aerobic composting, respectively, without specific limitation.

[0040] During the composting process, the nanofilm isolates the influence of the external environment on the maturity of the pile, and can increase the temperature of the pile in a short time; at the same time, because it blocks the discharge of most greenhouse gases, the pressure in the pile increases, which in turn promotes the uniform distribution of oxygen and enhances the aerobic effect. The biochar used has a large specific surface area and adsorption capacity, which can maintain the water content in the pile, provide attachment sites for microorganisms, and enhance the degradation of organic matter. After testing, the combined use of nanofilm and biochar for aerobic composting has a significant effect of enhancing composting compared to the use of nanofilm or biochar alone for aerobic composting. The combination of the two has an enhancing effect in extending the high temperature period and increasing the intensity of the composting process; in the composting cycle, the aerobic composting of nanofilm and biochar combined can complete the decomposition within 28 days, greatly shortening the composting time. During the high temperature period, the combined use can keep the pH of the pile stable, providing an environment required for microorganisms to maintain life activities.

[0041] The method of combining nanofilm and biochar to enhance aerobic composting is simple and convenient, with fast composting temperature rise, long heat preservation time, short decomposition cycle and strong product fertilizer effect.

[0042] Comparative Example 1

[0043] An aerobic composting method, without using a nanofilm and without adding biochar, specifically comprises the following steps:

[0044] Step 1: Take sheep manure and wheat straw, and crush the wheat straw into pieces with a crushing length of 3cm to 5cm.

[0045] Step 2: Mix sheep manure and wheat straw in a mass ratio of 1.5:1, add water and bacterial agent to the mixture to obtain compost raw material, and then place it in a compost barrel; the moisture content of the compost raw material is 60%, and the bacterial agent is purchased from Weifang Yihao Biotechnology Co., Ltd., and the mass percentage of the bacterial agent to the compost raw material is 0.01%.

[0046] Step 3: Carry out aerobic composting and use a silent air pump for aeration; the power of the silent air pump is 3.0W and the exhaust volume is 3.5L / min. Adjust the timer switch and set it to 5 minutes on and 55 minutes off.

[0047] Step 4: Turn the pile once on the 3rd, 5th, 7th, 9th, 14th, 21st and 28th day to obtain the final compost.

[0048] Comparative Example 2

[0049] An aerobic composting method using a nanofilm but without adding biochar comprises the following steps:

[0050] Step 1: Take sheep manure and wheat straw, and crush the wheat straw into pieces with a crushing length of 3cm to 5cm.

[0051] Step 2: Mix sheep manure and wheat straw in a mass ratio of 1.5:1, add water and bacterial agent to the mixture to obtain compost raw material, and then place it in a compost barrel; the moisture content of the compost raw material is 60%, and the bacterial agent is purchased from Weifang Yihao Biotechnology Co., Ltd., and the mass percentage of the bacterial agent to the compost raw material is 0.01%.

[0052] Step 3: Covering the surface of the compost body above the compost barrel with a nano-membrane for aerobic composting, the nano-membrane comprises an outer polyester film and an inner expanded polytetrafluoroethylene film, and the micropore diameter of the nano-membrane is 0.15nm to 0.35nm.

[0053] Step 4: Carry out aerobic composting and use a silent air pump for aeration; the power of the silent air pump is 3.0W and the exhaust volume is 3.5L / min. Adjust the timer switch and set it to 5 minutes on and 55 minutes off.

[0054] Step 5: Turn the pile once on the 3rd, 5th, 7th, 9th, 14th, 21st and 28th day to obtain the final compost.

[0055] Comparative Example 3

[0056] An aerobic composting method without using a nanofilm but with the addition of biochar comprises the following steps:

[0057] Step 1: Take sheep manure and wheat straw, and crush the wheat straw into pieces with a crushing length of 3cm to 5cm.

[0058] Step 2: Mix sheep manure and wheat straw in a mass ratio of 1.5:1, and add water and bacterial agent to the mixture to obtain a compost raw material; the moisture content of the compost raw material is 60%, and the bacterial agent is purchased from Weifang Yihao Biotechnology Co., Ltd., and the mass percentage of the bacterial agent to the compost raw material is 0.01%.

[0059] Step 3: Add biochar and compost raw materials, mix thoroughly, and then place in the compost barrel; the biochar is provided by Henan Lize Environmental Protection Technology Co., Ltd., and the mass ratio of biochar to compost raw materials is 5:100.

[0060] Step 4: Carry out aerobic composting and use a silent air pump for aeration; the power of the silent air pump is 3.0W and the exhaust volume is 3.5L / min. Adjust the timer switch and set it to 5 minutes on and 55 minutes off.

[0061] Step 5: Turn the pile once on the 3rd, 5th, 7th, 9th, 14th, 21st and 28th day to obtain the final compost.

[0062] Example 1

[0063] The present invention provides a method for strengthening aerobic composting by combining nanofilm and biochar, comprising the following steps:

[0064] Step 1: Take sheep manure and wheat straw, and crush the wheat straw into pieces with a crushing length of 3cm to 5cm.

[0065] Step 2: Mix sheep manure and wheat straw in a mass ratio of 1.5:1, and add water and bacterial agent to the mixture to obtain a compost raw material; the moisture content of the compost raw material is 60%, and the bacterial agent is purchased from Weifang Yihao Biotechnology Co., Ltd., and the mass percentage of the bacterial agent to the compost raw material is 0.01%.

[0066] Step 3: Add biochar and compost raw materials, mix thoroughly, and then place in the compost barrel; the biochar is provided by Henan Lize Environmental Protection Technology Co., Ltd., and the mass ratio of biochar to compost raw materials is 5:100.

[0067] Step 4: Cover the surface of the compost body above the compost barrel with a nano-membrane for aerobic composting. The nano-membrane includes an outer polyester film and an inner expanded polytetrafluoroethylene film. The micropore diameter of the nano-membrane is 0.15nm to 0.35nm.

[0068] Step 5: Carry out aerobic composting and use a silent air pump for aeration; the power of the silent air pump is 3.0W and the exhaust volume is 3.5L / min. Adjust the timer switch and set it to 5 minutes on and 55 minutes off.

[0069] Step six: Turn the pile once on the 3rd, 5th, 7th, 9th, 14th, 21st and 28th day to obtain the final compost.

[0070] Performance testing:

[0071] Composting was carried out according to the methods in Comparative Example 1, Comparative Example 2, Comparative Example 3 and Example 1, and the temperature and pH change data during the composting process were detected. The test results were as follows: Figure 2 and Figure 3 As shown in the figure, it can be seen that compared with Comparative Example 1, Comparative Example 2, Comparative Example 3 and Example 1 can increase the temperature of the pile body and prolong the duration of the high temperature period in a short time; Example 1 can increase the pH value of the pile body as a whole, and can keep the pH value of the pile body stable, which is the environment required for microorganisms to maintain life activities.

[0072] The seed germination rate of the composts at different times in Comparative Example 1, Comparative Example 2, Comparative Example 3 and Example 1 was tested, and the test results are shown in Table 1.

[0073] Table 1 Seed germination rate test table

[0074] Seed germination rate Compost 1d Compost 3D Compost 5 days Compost 7d Compost 9d Composting 14 days Composting 21 days Composting 28 days Comparative Example 1 8.03％ 13.3％ 22.62％ 31.53％ 42.13％ 56.28％ 60.36％ 76.57％ Comparative Example 2 8.58％ 15.33％ 31.81％ 35.99％ 45.42％ 58.98％ 62.47％ 80.09％ Comparative Example 3 9.34％ 16.75％ 24.09％ 42.23％ 53.43％ 63.13％ 67.56％ 82.6％ Example 1 12.02％ 21.73％ 37.89％ 46.74％ 61.32％ 65.95％ 75.15％ 94.35％

[0075] It can be seen from Table 1 that on the 9th day, the seed germination rate (GI value) of Comparative Example 3 and Example 1 exceeded 50%, reaching basic maturity; while on the 14th day, Comparative Example 1 and Comparative Example 2 exceeded 50% for the first time, indicating that the addition of biochar helps to accelerate the compost maturity process (P<0.05); when the composting was carried out to the 28th day, there was a significant difference between Comparative Example 1 and Example 1 (P<0.01), indicating that the combination of nanofilm and biochar can enhance aerobic composting, and the effect of Example 1 is better than the superposition of Comparative Example 2 and Comparative Example 3, indicating that the addition of biochar and covering with nanofilm have a synergistic effect in enhancing the composting effect.

[0076] Composting was carried out according to the methods in Comparative Example 1, Comparative Example 2, Comparative Example 3 and Example 1, and the data of total organic carbon (DOC) and total phosphorus (TP) during the composting process were tested. The test results are shown in Table 2.

[0077] Table 2 Total potassium and total phosphorus test table

[0078]

[0079] As can be seen from Table 2, at the end of composting, the DOC content of the compost after each method treatment was reduced by 14.08%, 19.76%, 18.53%, and 22.16% respectively compared with the DOC content at the beginning of composting, indicating that both covering the nanofilm and adding biochar have an effect on the organic carbon content, and the combination of the two has a greater effect on the reduction of the total organic carbon content. At the end of composting, the TP content of the compost after each method treatment increased by 12.05%, 39.00%, 33.73%, and 42.45% respectively compared with the TP content at the beginning of composting, wherein the growth rate of Example 1 is 3.52 times that of Comparative Example 1.

[0080] The nano-membrane used has an inner membrane pore size between 0.15nm and 0.35nm, which can block most water vapor and greenhouse gases such as carbon dioxide, methane, and nitrous oxide. At the same time, the outer membrane is UV-resistant, corrosion-resistant, highly hydrophobic, and tensile-resistant, which can reduce the impact of external environment such as acid rain erosion on the membrane material. During the composting process, the nano-membrane isolates the impact of the external environment on the maturity of the pile and can increase the temperature of the pile in a short time; at the same time, since it blocks the discharge of most greenhouse gases, the pressure in the pile increases, thereby promoting uniform oxygen distribution and enhancing the aerobic effect. The biochar used has a large specific surface area and adsorption capacity, which can maintain the water content in the pile, provide attachment sites for microorganisms, and enhance the degradation of organic matter. The combination of nano-membrane and biochar is used for aerobic composting. Figure 2 It can be seen that the nanofilm and biochar combined group was significantly higher than other control groups on the 10th to 13th day, indicating that the combination of the two has a reinforcing effect in extending the high temperature period and increasing the intensity of the composting process; in the composting cycle, the nanofilm and biochar combined aerobic composting can complete decomposition within 28 days, greatly shortening the composting time. Figure 3 It can be seen that during the high temperature period, the combined use can keep the pH of the pile stable, providing an environment required for microorganisms to maintain their life activities.

[0081] The various embodiments in the present application are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0082] The description of the present application is given for the purpose of illustration and description, and is not intended to be exhaustive or to limit the present application to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present application, and to enable those of ordinary skill in the art to understand the present application and thus design various embodiments with various modifications suitable for specific purposes.

[0083] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0084] Although the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description.

[0085] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. A method for strengthening aerobic composting by combining nanofilm and biochar, characterized in that: include: Mix livestock and poultry manure and straw, and add water and bacterial agents to obtain compost raw materials; The compost raw material is mixed with biochar and placed in a compost container to form a pile; A nano-film is covered on the pile body for aerobic composting, and the final compost is obtained by regular aeration and turning of the pile.

2. The method for strengthening aerobic composting by combining nanofilm and biochar according to claim 1, characterized in that: The livestock and poultry manure is one or more of pig manure, cow manure, chicken manure and sheep manure, the straw is one or more of corn straw, rice straw, sorghum straw and wheat straw, and the mass ratio of the livestock and poultry manure to the straw is (1-3):

1.

3. The method for strengthening aerobic composting by combining nanofilm and biochar according to claim 1, characterized in that: The mixing of livestock and poultry manure and straw comprises: The straw is crushed into 3 cm to 5 cm.

4. The method for strengthening aerobic composting by combining nanofilm and biochar according to claim 1, characterized in that: The bacterial agent is a composting bacterial agent, the mass percentage of the bacterial agent to the compost raw material is 0.01% to 0.05%, and the water content of the compost raw material is 55% to 65%.

5. The method for strengthening aerobic composting by combining nanofilm and biochar according to claim 1, characterized in that: The biochar is a carbonaceous material formed by carbonizing one or more substances selected from wood, coconut shell, bamboo and crop straw, and the mass ratio of the biochar to the compost raw material is (5-10):

100.

6. The method for strengthening aerobic composting by combining nanofilm and biochar according to claim 1, characterized in that: The nano-membrane comprises an outer polyester film and an inner expanded polytetrafluoroethylene film, and the micropore diameter of the nano-membrane is 0.15nm-0.35nm.

7. The method for strengthening aerobic composting by combining nanofilm and biochar according to claim 1, characterized in that: The aeration comprises: A silent air pump is used for periodic aeration. The aeration cycle of the silent air pump is set to 5 minutes on and 55 minutes off. The exhaust volume of the silent air pump is 3.5 L / min. The power of the silent air pump is 3.0 W.

8. The method for strengthening aerobic composting by combining nanofilm and biochar according to claim 1, characterized in that: The compost turning comprises: The surface pile of the pile is peeled off, and then the wet and hot pile in the middle is shaken out and placed around the bottom layer of the pile, and then the dry and cold pile is placed in the middle of the top of the pile, and the operation is repeated at regular intervals.

9. The method for strengthening aerobic composting by combining nanofilm and biochar according to claim 8, characterized in that: The repeated operation at a certain interval includes: When the average temperature of the pile is greater than 55°C, the composting is carried out every 2 days; When the average temperature of the pile is greater than or equal to 35° C. and less than or equal to 55° C., the composting is performed once every 5 days; When the average temperature of the pile is less than 35° C., the composting is carried out once every 7 days.

10. The method for strengthening aerobic composting by combining nanofilm and biochar according to claim 8, characterized in that: The repeated operation at a certain interval includes: The composting is carried out once on the 3rd day, the 5th day, the 7th day, the 9th day, the 14th day, the 21st day and the 28th day of the aerobic composting.

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