Method for composting by adopting hermetia illucens faeces

Abstract

The invention relates to a method for composting by adopting hermetia illucens fecula. The method comprises the following steps: collecting hermetia illucens fecula and biological wastes; the method comprises the following steps of: mixing the raw materials, so that the carbon-nitrogen ratio in a mixture is (20-30): 1, spraying a microbial complex microbial inoculant, adding glucose, monopotassium phosphate, polysorbate, ferrous sulfate, manganese sulfate and copper sulfate, fully mixing, piling, covering with a heat-insulating film, and sealing to obtain a primary compost; collecting hollow bricks, laying a first hollow brick layer on the plane, enabling pores of the first hollow brick layer to be parallel to the horizontal plane, turning the primary compost to the first hollow bricks to form a first compost layer, flattening, laying a second hollow brick layer, sequentially carrying out the steps for a plurality of times until composting is completed, and covering the periphery of a compost body with a heat-insulating film to form the compost. And keeping for 10-30 days. The method can increase the abundance and strength of microbial metabolic pathways, increase the composting temperature, prolong the high-temperature time of the compost, accelerate the decomposition of the compost, and realize the harmlessness of the black soldier fly feces.

Description

Technical Field

[0001] The invention belongs to the field of agriculture and relates to a composting method, in particular to a composting method using black soldier fly feces. Background Art

[0002] Black soldier flies are an insect that lives near water and can convert organic waste into highly efficient organic fertilizer. During their life cycle, the larvae will eat a large amount of organic waste, such as peels, leftovers, waste paper, leaves, etc. After fermentation and decomposition, their feces are rich in protein, nitrogen, phosphorus and other elements, which can be used as high-quality organic fertilizer.

[0003] The feces of black soldier flies are rich in beneficial elements such as microorganisms and enzymes, which can promote soil softness and structural stability, improve soil permeability and water retention capacity, provide nutrition and support for crop growth, thereby improving yield and quality.

[0004] Black soldier fly feces does not only contain feces, but also eggs, larvae, and some adults. If they are not treated, the adults may fly away directly during subsequent use. The eggs and larvae develop into adults and fly away, which will have an impact on the natural environment and pose a danger to the ecology and human health. How to effectively solve the problem of black soldier fly feces and waste utilization has always been a technical problem to be solved in the ecological field. Summary of the invention

[0005] In view of the above technical problems in the prior art, the present invention provides a method for composting using black soldier fly feces. The method for composting using black soldier fly feces is intended to solve the technical problems in the prior art of solving the ecological safety risks in the process of reusing and composting black soldier fly feces.

[0006] The present invention provides a method for composting using black soldier fly feces, comprising the following steps: 1) collecting black soldier fly feces and biological waste, wherein the biological waste is any one of sawdust or dead branches and leaves, or a mixture of the two in any proportion; 2) Weighing black soldier fly feces and biological waste, mixing them, and making the carbon-nitrogen ratio (C / N) in the mixture (20-30): 1, then spraying 1%-3% of the mass of the mixed substance with a microbial composite agent, wherein the microbial composite agent is a combination of Bacillus, Thermus thermophilus, Pseudomonas fluorescens, Streptomyces erythrogenus, Penicillium chrysogenum, and Trichoderma viride, and adding 1-3% of glucose, 0.5-3‰ of potassium dihydrogen phosphate, 1-5‰ of polysorbate, 0.5-3‰ of ferrous sulfate, 0.5-3‰ of manganese sulfate, and 0.5-3‰ of copper sulfate to the mixed substance, and after fully mixing, adding water to control the moisture content to 55-60%, stacking for 2-4 days, and covering with a heat-insulating film to obtain preliminary compost; 3) Collect hollow bricks, soak the hollow bricks in water thoroughly before use, lay a first hollow brick layer on a plane, the first hollow brick layer is placed horizontally, the pores of any hollow bricks in the first hollow brick layer are parallel to the horizontal plane, then turn the preliminary compost from step 2) onto the hollow bricks to form a first compost layer, and after leveling, lay a second hollow brick layer, the second hollow brick layer is placed horizontally, the pores of any hollow bricks in the second hollow brick layer are parallel to the horizontal plane, turn the preliminary compost from step 2) onto the second hollow brick layer to form a second compost layer, and then level, perform the above steps several times in sequence, and then cover the outer periphery of the pile with a thermal insulation film for 10 to 30 days.

[0007] Furthermore, the size of the hollow brick is 390×190×190 mm, and the height of the compost layer in step 3) is between 150 and 390 mm.

[0008] Furthermore, in the microbial composite agent, the quantity ratio of the Bacillus, Thermus thermophilus, Pseudomonas fluorescens, Streptomyces erythrogenus, Penicillium chrysogenum, and Trichoderma viride is 1:1:1:1:1:1:1.

[0009] The working principle of the present invention is: 1) Black soldier fly feces are the solid residues left after black soldier flies dispose of kitchen waste. They still contain a certain amount of eggs and insect bodies, which poses a certain ecological risk. Using specific microbial agents and specific chemical reagents can quickly heat up the pile, increase the temperature of the pile and continuously maintain the high temperature of the pile, which can completely kill the insect bodies in the pile and eliminate safety hazards.

[0010] 2) At the same time, black soldier fly feces are generally weakly acidic, and hollow bricks are generally alkaline. The microorganisms in the black soldier fly feces compost that is in contact with hollow bricks have a neutral pH. At the same time, the hollow bricks have been pre-soaked, and the water content of the bricks is higher. The contact surface is more suitable for the reproduction of microorganisms, and the microorganisms reproduce and metabolize faster.

[0011] 3) The present invention is divided into two stages of fermentation: the first stage is to allow the microorganisms in the compost to multiply rapidly. After 2-4 days, the compost is full of microorganisms and the oxygen in the compost is basically consumed. The second stage is to stack the compost as required. After the compost contacts the hollow bricks, the microorganisms further multiply, metabolize and generate heat to maintain the high temperature of the compost.

[0012] 4) The present invention utilizes the spatial rigidity and pores of hollow bricks to construct air passages in the pile, thereby improving the anaerobic microenvironment in the pile and increasing the efficiency of aerobic composting.

[0013] 5) The present invention adopts a combination of potassium dihydrogen phosphate (KH2PO4), polysorbate, ferrous sulfate (FeSO4), manganese sulfate (MnSO4), and copper sulfate, which can increase the abundance and intensity of microbial metabolic pathways, accelerate and extend the high temperature time of composting, accelerate the maturity of the compost, and achieve the harmlessness of black soldier fly feces, which is safe and environmentally friendly.

[0014] 6) The outer periphery of the composting pile of the present invention is covered with a heat-insulating film, and the composting pile does not need to be turned during the composting process, and a high temperature of more than 70° C. can be maintained for at least 10 days.

[0015] Compared with the prior art, the technical effect of the present invention is positive and obvious. The present invention utilizes the high temperature of composting to completely kill the eggs, larvae and adults of the insects. Such insect feces will not pose an ecological safety risk in the later utilization, and waste utilization is also achieved at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It shows that the composting temperature and high temperature maintenance time of the black soldier fly composting method (L2) of the embodiment of the present invention are better than those of the common composting (L1). In this example, the compost is turned into hollow bricks on the third day. DETAILED DESCRIPTION Normal compost (L1)

[0017] 1) Collect 500 kg of black soldier fly feces, add dead branches and leaves, adjust the carbon-nitrogen ratio of the black soldier fly feces compost to 25:1, add water to control the moisture content to 60%, cover the compost with film, and compost for 30 days. Example

[0018] The present invention provides a method for composting using black soldier fly feces, comprising the following steps: 1) Collect 500 kg of black soldier fly feces; 2) Weigh the black soldier fly feces and dead branches and leaves, mix them, make the carbon-nitrogen ratio (C / N) in the mixture to be 25:1, then spray 2% of the mass of the mixed substance with a microbial composite agent, the microbial composite agent is a combination of Bacillus, Thermus thermophilus, Pseudomonas fluorescens, Streptomyces erythrogenus, Penicillium chrysogenum, and Trichoderma viride, and add 2% of glucose, 2‰ of potassium dihydrogen phosphate (KH2PO4), 2‰ of polysorbate, 2‰ of ferrous sulfate (FeSO4), 2‰ of manganese sulfate (MnSO4), and 2‰ of copper sulfate (CuSO4) to the mixture, mix thoroughly, add water to control the moisture content to 60%, pile for 3 days, cover with insulation film and seal to obtain preliminary compost; 3) Collect hollow bricks, soak the hollow bricks thoroughly in water before use, lay a first hollow brick layer on a plane, the pores of the first hollow brick layer are parallel to the horizontal plane, then turn the preliminary compost from step 2) onto the hollow bricks to form a first compost layer, and after leveling, lay a second hollow brick layer, the pores of the second hollow brick layer are parallel to the horizontal plane, and turn the preliminary compost from step 2) onto the second hollow brick layer to form a second compost layer, perform the above steps several times in sequence until the composting is completed and the total height of the pile is not higher than 2m, and then cover the outer periphery of the pile with a thermal insulation film for 30 days.

[0019] Specifically, in the microbial composite agent used in this embodiment, the quantity ratio of Bacillus, Thermus thermophilus, Pseudomonas fluorescens, Streptomyces erythrogenus, Penicillium chrysogenum, and Trichoderma viride is 1:1:1:1:1:1:1.

[0020] During the entire composting process, the temperature of the L1 pile was lower than 60°C, and the temperature of the L2 pile was higher than 60°C for 16 days, including 12 days higher than 70°C. The continuous high temperature can kill the eggs, larvae and adults in the black soldier fly feces.

[0021] Specifically, the size of the hollow bricks used in this embodiment is 390×190×190 mm, and the height of the compost layer in step 3) is 290 mm.

[0022]

[0023] The hollow bricks of the present invention are placed horizontally. During the composting process, the pores inside the brick body will not be compacted as the pile body settles, and the pores are always maintained inside the pile body, which greatly improves the local anaerobic problem inside the compost.

Claims

1. A method for composting using black soldier fly feces, characterized in that The steps include: 1) collecting black soldier fly feces and biological waste, wherein the biological waste is any one of sawdust or dead branches and leaves, or a mixture of the two in any proportion; 2) Weighing black soldier fly feces and biological waste, mixing them, making the carbon-nitrogen ratio in the mixture (20-30): 1, then spraying 1%-3% of the mass of the mixed substance with a microbial composite agent, wherein the microbial composite agent is a combination of Bacillus, Thermus thermophilus, Pseudomonas fluorescens, Streptomyces erythrogenus, Penicillium chrysogenum, and Trichoderma viride, and adding 1-3% of glucose, 0.5-3‰ of potassium dihydrogen phosphate, 1-5‰ of polysorbate, 0.5-3‰ of ferrous sulfate, 0.5-3‰ of manganese sulfate, and 0.5-3‰ of copper sulfate to the mixed substance, and after fully mixing, adding water to control the moisture content to 55-60%, stacking for 2-4 days, covering with a heat preservation film to obtain preliminary compost; 3) Collect hollow bricks, soak the hollow bricks in water thoroughly before use, lay a first hollow brick layer on a plane, the first hollow brick layer is placed horizontally, the pores of any hollow bricks in the first hollow brick layer are parallel to the horizontal plane, then turn the preliminary compost from step 2) onto the hollow bricks to form a first compost layer, and after leveling, lay a second hollow brick layer, the second hollow brick layer is placed horizontally, the pores of any hollow bricks in the second hollow brick layer are parallel to the horizontal plane, turn the preliminary compost from step 2) onto the second hollow brick layer to form a second compost layer, and then level, perform the above steps several times in sequence, and then cover the outer periphery of the pile with a thermal insulation film for 10 to 30 days.

2. The method of using black soldier fly feces for composting according to claim 1, characterized in that: The size of the hollow brick is 390×190×190 mm, and the height of the compost layer in step 3) is between 150 and 390 mm.

3. The method of composting using black soldier fly feces according to claim 1, characterized in that: In the microbial composite agent, the quantity ratio of the Bacillus, Thermus thermophilus, Pseudomonas fluorescens, Streptomyces erythrogenus, Penicillium chrysogenum and Trichoderma viride is 1:1:1:1:1:1:1.

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