Preparation method of bio-organic fertilizer

Abstract

The invention belongs to the technical field of composting, and particularly relates to a preparation method of a bio-organic fertilizer. The preparation method of the bio-organic fertilizer comprises the following steps: putting livestock manure as an organic fertilizer raw material into a mixed fermentation tank to obtain a temperature value, a humidity value and an oxygen concentration value of the organic fertilizer raw material; according to any one of the conditions that the temperature value is within the first preset range, the humidity value is within the second preset range and the oxygen concentration value is within the third preset range, the organic fertilizer raw materials are treated, microbial communities are added during turning and throwing to be fermented into the organic fertilizer, and the organic fertilizer is dried. According to the preparation method of the organic fertilizer, temperature, humidity and oxygen concentration are monitored in real time and are dynamically regulated and controlled, so that the interior of the raw materials of the organic fertilizer is always kept under the optimal conditions suitable for microbial activity. The conditions can obviously improve the metabolism efficiency of microorganisms and accelerate the decomposition of organic matters, so that the fermentation period is obviously shortened.

Description

Technical Field

[0001] The present invention belongs to the technical field of composting, and particularly relates to a preparation method of bio-organic fertilizer. Background Art

[0002] As a green and environment-friendly fertilizer, bio-organic fertilizer is widely used in agricultural production. Its main components are organic wastes treated by biological fermentation, such as agricultural wastes, animal feces, kitchen waste and other raw materials. The traditional production process of bio-organic fertilizer includes collection, screening, pretreatment of raw materials, composting fermentation, turning and aeration control, screening and drying treatment, and finally packaging and storage. Composting fermentation is the core link, which is divided into aerobic fermentation and anaerobic fermentation stages. In the aerobic fermentation stage, by adjusting the temperature and humidity of the organic fertilizer raw materials, aerobic microorganisms are promoted to decompose organic substances. In the anaerobic fermentation stage, anaerobic microorganisms continue to decompose organic substances and produce organic fertilizers. The turning operation plays an important role in the composting process, which can increase the oxygen supply of the organic fertilizer raw materials, avoid caking, and promote the activities of aerobic microorganisms.

[0003] Although the traditional process is widely used, it still has many deficiencies, such as a long fermentation period, gas emission problems, complex heat management during composting, and unstable product quality. Traditional composting usually takes several weeks or even months to complete, and gas emission problems (such as methane, ammonia, etc.) can cause potential pollution to the environment. In addition, improper control of temperature and humidity during composting will affect the activity of microorganisms, resulting in uneven decomposition effect and ultimately affecting the product quality. Summary of the Invention

[0004] The purpose of the present invention is to at least solve the problem of the long fermentation time of bio-organic fertilizer. This purpose is achieved by the following technical solutions:

[0005] The present invention provides a preparation method of bio-organic fertilizer, comprising the following steps:

[0006] Using livestock and poultry manure as the raw material of organic fertilizer and putting it into a mixed fermentation tank;

[0007] Obtaining the temperature value, humidity value and oxygen concentration value of the organic fertilizer raw material;

[0008] According to any one of the temperature value being within a first preset range, the humidity value being within a second preset range, and the oxygen concentration value being within a third preset range, treating the organic fertilizer raw material;

[0009] Adding a microbial community during the treatment and fermenting it into organic fertilizer;

[0010] Drying the organic fertilizer.

[0011] According to the preparation method of the organic fertilizer of the present invention, by monitoring the temperature, humidity and oxygen concentration in real time and dynamically regulating them, the inside of the organic fertilizer raw materials is always maintained at the optimal conditions suitable for the activity of microorganisms. These conditions can significantly improve the metabolic efficiency of microorganisms and accelerate the decomposition of organic matter, thus significantly shortening the fermentation cycle. At the same time, through the precise control of temperature and humidity, the volatilization of nitrogen and the loss of nutrients caused by too high temperature or out-of-control humidity during the fermentation process are avoided. Especially under the action of the microbial community, nitrogen-fixing bacteria can convert nitrogen into stable organic nitrogen, further improving the nutrient utilization rate of the organic fertilizer.

[0012] In addition, according to the preparation method of the biological organic fertilizer of the present invention, the following additional technical features may also be included:

[0013] In some embodiments of the present invention, the organic fertilizer raw materials further include crop residues, and the mixing ratio of the crop residues to the livestock and poultry manure is 2:1 to 3:1.

[0014] In some embodiments of the present invention, the first preset range is that the temperature value is lower than 50°C and higher than 65°C. According to the temperature value being within the first preset range, the steps of processing the organic fertilizer raw materials include:

[0015] If the temperature value is less than 50°C, continue to fill the organic fertilizer raw materials into the mixing fermentation tank;

[0016] If the temperature value is greater than 65°C, control the turning device to turn over the organic fertilizer raw materials.

[0017] In some embodiments of the present invention, the second preset range is that the humidity value is lower than 55% and higher than 70%. According to the humidity value being within the second preset range, the steps of processing the organic fertilizer raw materials include:

[0018] If the humidity value is lower than 55%, control the turning device to turn over the organic fertilizer raw materials and spray water on the organic fertilizer raw materials at the same time;

[0019] If the humidity value is higher than 70%, control the turning device to turn over the organic fertilizer raw materials.

[0020] In some embodiments of the present invention, the third preset range is that the oxygen concentration value is lower than 15% and higher than 20%. According to the oxygen concentration value being within the third preset range, the steps of processing the organic fertilizer raw materials include:

[0021] If the oxygen concentration value is lower than 15%, control the turning device to turn over the organic fertilizer raw materials;

[0022] If the oxygen concentration value is higher than 20%, continue to fill the organic fertilizer raw materials into the mixing fermentation tank.

[0023] In some embodiments of the present invention, the microbial community includes at least one of cellulose-decomposing bacteria, nitrogen-fixing bacteria, and lactic acid bacteria.

[0024] In some embodiments of the present invention, the addition amount of the microbial community is 0.12% to 0.18% of the organic fertilizer raw material.

[0025] In some embodiments of the present invention, after the step of drying the organic fertilizer, the following steps are further included:

[0026] Pelletize the dried organic fertilizer;

[0027] Bag and store the pelletized organic fertilizer.

[0028] In some embodiments of the present invention, the step of pelletizing the dried organic fertilizer includes:

[0029] Crush and screen the dried organic fertilizer, and retain the particles with a diameter of 2 mm to 4 mm after screening;

[0030] Mix the screened particles with trace elements to form a material;

[0031] Transport the material to a granulator to participate in granulation.

[0032] In some embodiments of the present invention, the moisture content of the material is less than 15%. Description of the Drawings

[0033] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0034] Figure 1 is a flowchart of the preparation method of the biological organic fertilizer according to the embodiment of the present invention;

[0035] Figure 2 Schematically shows a structural diagram of a turning device and a mixing fermentation tank according to an embodiment of the present invention.

[0036] The reference numerals are as follows:

[0037] 100, mixing fermentation tank; 101, organic fertilizer raw material; 200, turning device. Detailed Embodiments

[0038] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art.

[0039] It should be understood that the terms used herein are for the purpose of describing particular example embodiments only and are not intended to be limiting. Unless the context clearly dictates otherwise, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing", and "having" are inclusive and thus specify the presence of the stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is expressly stated. It should also be understood that additional or alternative steps may be used.

[0040] Although the terms first, second, third, etc. may be used herein to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another. Unless the context clearly indicates otherwise, terms such as "first" and "second" and other numerical terms when used herein do not imply an order or sequence. Thus, a first element, component, region, layer, or section discussed below may be referred to as a second element, component, region, layer, or section without departing from the teachings of the example embodiments.

[0041] For ease of description, spatial relative relationship terms may be used herein to describe the relationship of one element or feature shown in the figures to another element or feature, such as "inside", "outside", "inner side", "outer side", "below", "beneath", "above", "over", etc. Such spatial relative relationship terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as "below" or "beneath" another element or feature will then be oriented "above" or "over" the other element or feature. Thus, the exemplary term "below" can include both an orientation above and below.

[0042] As Figure 2As shown below, before describing the preparation method of the biological organic fertilizer of the present application, first describe the turning device 200 to be used in the present application. The turning device 200 includes an installation component, a turning component, a transmission part, a hydraulic component, a traveling mechanism, a control device, a spraying component, etc. Specifically, the first installation plate of the installation component serves as the basic component of the turning device 200, bearing the entire turning device 200. It is connected to the first installation plate through the traveling installation bracket of the traveling mechanism, supporting the weight of the turning device 200. The traveling installation bracket is firmly installed to ensure the stability of the turning device 200 in the mixing fermentation tank 100. Traveling wheels are installed through the traveling installation plate, and the traveling wheels are connected to the traveling installation plate through bearings, enabling the turning device 200 to move freely in the fermentation tank. The number and layout design of the traveling wheels ensure that the turning device 200 can move flexibly in the tank, avoiding jamming or deviating from the track. The second installation plate of the installation component is connected to the first installation plate in a rotatable manner, forming a certain angle. The second installation plate supports the movement of the turning component. The turning component includes a bracket and a turning connection plate. The bracket supports the entire turning component and, by connecting to the second installation plate, ensures the stable operation of the turning component. Multiple brackets are evenly distributed along the second installation plate to enhance the overall supporting force. The turning connection plate is composed of L-shaped angle steel and cooperates with a chain and turning teeth to form a turning part. Each turning part includes multiple turning teeth arranged staggered along the extension direction of the connection plate to ensure uniform turning of the materials during the turning process. The hydraulic component includes a hydraulic cylinder and a hydraulic piston. The hydraulic cylinder is fixedly installed on the first installation plate to provide hydraulic power. The hydraulic piston is connected to the second installation plate, and the telescoping of the piston adjusts the angle to control the movement trajectory of the turning component. The spraying component includes a spraying pipeline, a liquid storage container, and a liquid distribution valve. The spraying component is connected to multiple spray heads through pipelines, and the spray heads are distributed around the turning connection plate. The pipeline is connected to the liquid storage container, and the liquid flow rate is controlled through the valve. The liquid storage container includes multiple ones, respectively storing water, calcium carbonate solution, ammonium sulfate solution, etc. Each solution is equipped with an independent control valve, and the spraying amount of each liquid is precisely controlled through the control valve. The control device can control the start, stop of the turning device 200, the angle adjustment of the hydraulic system, the operation of the spraying system, etc.

[0043] It can be understood that the turning device 200 is arranged on the mixing fermentation tank 100 and moves along the tracks on both sides of the mixing fermentation tank 100.

[0044] As Figure 1 shown, according to an embodiment of the present invention, a preparation method of a biological organic fertilizer is proposed, including the following steps:

[0045] Take livestock and poultry manure as the organic fertilizer raw material 101 and put it into the mixing fermentation tank 100;

[0046] Obtain the temperature value, humidity value, and oxygen concentration value of the organic fertilizer raw material 101;

[0047] Process the organic fertilizer raw material 101 according to any one of the temperature value being within the first preset range, the humidity value being within the second preset range, and the oxygen concentration value being within the third preset range;

[0048] Add a microbial community during turning and ferment it into organic fertilizer;

[0049] Dry the organic fertilizer.

[0050] According to the method for preparing the organic fertilizer of the present invention, by monitoring the temperature, humidity and oxygen concentration in real time and dynamically regulating them, the inside of the organic fertilizer raw material 101 is always maintained at the optimal conditions suitable for the activity of microorganisms. These conditions can significantly improve the metabolic efficiency of microorganisms, accelerate the decomposition of organic matter, and thus significantly shorten the fermentation cycle. At the same time, through the precise control of temperature and humidity, the volatilization of nitrogen and nutrient loss caused by too high temperature or out-of-control humidity during the fermentation process are avoided. Especially under the action of the microbial community, nitrogen-fixing bacteria can convert nitrogen into stable organic nitrogen, further improving the nutrient utilization rate of the organic fertilizer.

[0051] It can be understood that the organic fertilizer raw material 101 also includes crop residues, and the mixing ratio of crop residues to livestock and poultry manure is 2:1 to 3:1. First of all, crop residues are rich in cellulose and carbon elements, and livestock and poultry manure is rich in nitrogen elements. Mixing crop residues with livestock and poultry manure in a ratio of 2:1 to 3:1 can make the carbon-nitrogen ratio of the compost reach the ideal range (about 25:1 to 30:1). The appropriate carbon-nitrogen ratio provides more balanced nutritional conditions for microorganisms, significantly accelerating the decomposition process of organic matter and shortening the fermentation cycle. Secondly, crop residues have good air permeability and structural support. After mixing with livestock and poultry manure, the organic fertilizer raw material 101 is more loose, avoiding the problem of easy caking when manure ferments alone, improving the oxygen circulation conditions inside the organic fertilizer raw material 101, and ensuring that the compost is always in a good aerobic environment. Moreover, crop residues usually have a lower water content. After mixing with high-humidity livestock and poultry manure, they can effectively absorb the excess water in the manure, avoid the occurrence of over-wet phenomena during the composting process, and at the same time reduce the workload and energy consumption of the drying link. In addition, by adding crop residues, the high-nitrogen characteristics of livestock and poultry manure are diluted, reducing the generation of harmful gases such as ammonia and hydrogen sulfide during the composting process, significantly reducing the odor emission and environmental pollution during the fermentation process. Finally, the addition of crop residues improves the resource utilization rate of waste, combines agricultural waste with livestock and poultry manure, realizes circular utilization in agricultural production, further reduces the cost of the organic fertilizer raw material 101, and improves economic and environmental benefits.

[0052] In some embodiments, the first preset range is that the temperature value is lower than 50°C and higher than 65°C. According to the temperature value within the first preset range, the steps of processing the organic fertilizer raw material 101 include: if the temperature value is less than 50°C, continuously filling the organic fertilizer raw material 101 into the mixing fermentation tank 100; or, if the temperature value is greater than 65°C, controlling the turning device 200 to turn over the organic fertilizer raw material 101. By real-time monitoring and dynamic adjustment of the composting temperature, it is ensured that the organic fertilizer raw material 101 is always maintained within the appropriate fermentation temperature range (50°C - 65°C). If the temperature is lower than 50°C, adding fresh raw materials provides additional biodegradation heat for the organic fertilizer raw material 101, quickly raising the temperature to the optimal range for microbial activity; if the temperature is higher than 65°C, effective heat dissipation is achieved through the turning operation, avoiding the adverse effects of overheating on microbial activity, thereby improving the fermentation efficiency. In addition, adding fresh organic fertilizer raw material 101 at low temperature not only supplements the heat source but also provides a new organic matter substrate for microorganisms, maintaining the activity and metabolic capacity of the microbial community. At high temperature, the turning operation reduces the risk of local overheating, preventing beneficial microorganisms from being inactivated due to high temperature and maintaining the stability and diversity of the microbial population within the organic fertilizer raw material 101.

[0053] In some embodiments, the second preset range is that the humidity value is lower than 55% and higher than 70%. According to the humidity value within the second preset range, the steps of processing the organic fertilizer raw material 101 include: if the humidity value is lower than 55%, controlling the turning device 200 to turn over the organic fertilizer raw material 101 and spraying water onto the organic fertilizer raw material 101 simultaneously; or, if the humidity value is higher than 70%, controlling the turning device 200 to turn over the organic fertilizer raw material 101. By real-time monitoring of the humidity and dynamic adjustment, it is ensured that the humidity of the organic fertilizer raw material 101 is always maintained within the ideal range (55% - 70%). When the humidity is lower than 55%, the turning operation combined with spraying water enables the organic fertilizer raw material 101 to quickly return to the appropriate humidity; when the humidity is higher than 70%, turning alone can accelerate water evaporation, avoiding the formation of an overly wet environment, thereby ensuring the stability and efficiency of the fermentation process. At the same time, too low humidity will limit the metabolic and decomposition ability of microorganisms, while too high humidity may inhibit the activity of aerobic microorganisms, leading to anaerobic fermentation and the generation of harmful gases. Through dynamic humidity regulation, a suitable growth environment for microorganisms is maintained, promoting the reproduction and activity of beneficial microorganisms, thereby accelerating the decomposition of organic matter and improving the fermentation efficiency. In addition, the application of the turning operation in humidity regulation not only evenly distributes the sprayed water but also improves the overall distribution of humidity within the organic fertilizer raw material 101, avoiding over-dry or over-wet local areas and enhancing the consistency and overall quality of the compost.

[0054] In some embodiments, the third preset range is that the oxygen concentration value is lower than 15% and higher than 20%. According to the oxygen concentration value being within the third preset range, the steps of processing the organic fertilizer raw material 101 include: if the oxygen concentration value is lower than 15%, controlling the turning device 200 to turn the organic fertilizer raw material 101; or, if the oxygen concentration value is higher than 20%, continuously filling the organic fertilizer raw material 101 into the mixing fermentation tank 100. By dynamically adjusting the oxygen concentration, it is ensured that an appropriate aerobic environment (15% - 20%) is always maintained within the organic fertilizer raw material 101, maximizing the activity of aerobic microorganisms, accelerating the decomposition process of organic matter, and improving the fermentation efficiency. If the oxygen concentration is lower than 15%, a turning operation is promptly performed to effectively increase the oxygen supply within the organic fertilizer raw material 101, avoiding anaerobic fermentation and the generation of harmful gases caused by insufficient oxygen. When the oxygen concentration is higher than 20%, the oxygen concentration is reduced by filling fresh raw materials, avoiding ammonia volatilization and nitrogen loss caused by excessive oxygen, thereby retaining more nutrients such as nitrogen, phosphorus, and potassium in the compost and improving the nutrient content and quality of the final fertilizer. At the same time, the turning operation can improve the air circulation inside the organic fertilizer raw material 101, effectively discharging carbon dioxide and moisture within the organic fertilizer raw material 101, inhibiting the anaerobic environment caused by too low oxygen concentration, reducing the generation of harmful gases such as hydrogen sulfide and methane, and optimizing the environmental protection of the fermentation process.

[0055] In some embodiments, the microbial community includes at least one of cellulose-decomposing bacteria, nitrogen-fixing bacteria, and lactic acid bacteria. First, the microbial community contains cellulose-decomposing bacteria. These cellulose-decomposing bacteria can efficiently decompose complex organic matters such as cellulose and hemicellulose in the compost pile, convert them into simple sugars and organic acids, provide substrates for the metabolism of other microorganisms, greatly increase the decomposition rate of organic matter, and thus accelerate the preparation process of organic fertilizer. Second, nitrogen-fixing bacteria can convert free nitrogen in the air into organic nitrogen, supplement the nitrogen supply in the compost pile, optimize the carbon-nitrogen ratio during the preparation of organic fertilizer, and further promote the growth and metabolic activities of microorganisms. The improvement of the carbon-nitrogen ratio makes the fermentation of the organic fertilizer raw material 101 more efficient. Finally, lactic acid bacteria produce lactic acid during the fermentation process, which can effectively adjust the pH value of the compost pile, maintain it within an appropriate range, inhibit the reproduction of pathogenic bacteria and other harmful microorganisms, and improve the hygiene and safety of the organic fertilizer preparation process.

[0056] In some embodiments, the addition amount of the microbial community is 0.12% to 0.18% of the organic fertilizer raw material 101. Controlling the addition amount of the microbial community to be 0.12% to 0.18% of the organic fertilizer raw material 101 can provide sufficient microbial activity support for the compost, while avoiding resource waste caused by excessive strains or a reduction in fermentation efficiency caused by too few strains, ensuring the efficient progress of the composting process.

[0057] In some embodiments, after the step of drying the organic fertilizer, the method further includes granulating the dried organic fertilizer, and then bagging and storing the granulated organic fertilizer. Through the granulation process, the dried organic fertilizer is transformed into a granular product with uniform particle size and stable physical properties, which is convenient for transportation, storage, and application. The granular organic fertilizer can be evenly distributed using mechanical fertilization equipment, improving the fertilization efficiency and accuracy.

[0058] Further, the step of granulating the dried organic fertilizer includes crushing and screening the dried organic fertilizer, retaining the particles with a diameter of 2 mm to 4 mm after screening, mixing the screened particles with trace elements to form a material, and conveying the material to a granulator to participate in granulation. By screening and retaining the particles with a diameter of 2 mm to 4 mm, it is ensured that the particle size of the raw material is within an appropriate range, which can significantly improve the matching degree between the raw material and the granulation equipment, reduce problems such as blockage and poor granulation caused by uneven particle size during the granulation process, and improve the granulation efficiency and the finished product rate.

[0059] Further, the moisture content of the material is lower than 15%. Controlling the moisture content of the material below 15% makes it easier for the raw material to bond and form during the granulation process. The material with a low moisture content has better fluidity, which can significantly improve the operating efficiency of the granulator and make the surface of the granulated particles smooth and the shape regular. At the same time, the particles with a low moisture content have higher strength and density after drying, are not easily broken or pulverized, and have better compressive and abrasion resistance, which is convenient for storage and transportation.

[0060] As described above, the above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for preparing a bio-organic fertilizer, characterized in that: The steps include: Use livestock manure as organic fertilizer raw material and put it into the mixed fermentation tank; Obtaining the temperature value, humidity value and oxygen concentration value of the organic fertilizer raw material; According to any one of the temperature value being within the first preset range, the humidity value being within the second preset range, and the oxygen concentration value being within the third preset range, the organic fertilizer raw material is processed; Add microbial communities to ferment organic fertilizer while processing; The organic fertilizer is dried.

2. The preparation method of bio-organic fertilizer according to claim 1, characterized in that, The organic fertilizer raw material also includes crop residues, and the mixing ratio of the crop residues to the livestock manure is 2:1 to 3:

1.

3. The preparation method of bio-organic fertilizer according to claim 2, characterized in that, The first preset range is a temperature value lower than 50° C. and higher than 65° C. According to the temperature value being within the first preset range, the step of processing the organic fertilizer raw material includes: If the temperature value is less than 50° C., continue to fill the mixed fermentation tank with the organic fertilizer raw material; If the temperature value is greater than 65° C., the turning device is controlled to turn the organic fertilizer raw material.

4. The preparation method of bio-organic fertilizer according to claim 3, characterized in that, The second preset range is a humidity value lower than 55% and higher than 70%. According to the humidity value being within the second preset range, the step of processing the organic fertilizer raw material includes: If the humidity value is lower than 55%, controlling the turning device to turn the organic fertilizer raw material and spraying water on the organic fertilizer raw material; If the humidity value is higher than 70%, the turning device is controlled to turn the organic fertilizer raw material.

5. The preparation method of bio-organic fertilizer according to claim 4, characterized in that, The third preset range is an oxygen concentration value lower than 15% and higher than 20%. According to the oxygen concentration value being within the third preset range, the step of processing the organic fertilizer raw material includes: If the oxygen concentration value is lower than 15%, controlling the turning device to turn the organic fertilizer raw material; If the oxygen concentration value is higher than 20%, the organic fertilizer raw material is continuously filled into the mixed fermentation tank.

6. The method for preparing a bio-organic fertilizer according to any one of claims 1 to 5, characterized in that: The microbial community includes at least one of cellulose decomposing bacteria, nitrogen fixing bacteria and lactic acid bacteria.

7. The method for preparing a bio-organic fertilizer according to any one of claims 1 to 5, characterized in that: The added amount of the microbial community is 0.12% to 0.18% of the organic fertilizer raw material.

8. The method for preparing a bio-organic fertilizer according to any one of claims 1 to 5, characterized in that: The step of drying the fertilizer further comprises: Granulating the dried organic fertilizer; The organic fertilizer after granulation is bagged and stored.

9. The preparation method of bio-organic fertilizer according to claim 8, characterized in that, The step of granulating the dried organic fertilizer comprises: The dried organic fertilizer is crushed and sieved, and particles with a diameter of 2 mm to 4 mm are retained after sieving; The sieved particles are mixed with trace elements to form a material; The material is transported to the granulator for granulation.

10. The method for preparing bio-organic fertilizer according to claim 9, characterized in that: The moisture content of the material is lower than 15%.

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