Method for producing enhanced soil carbon sequestration material by using ultrasonic cavitation process and product thereof

Abstract

The invention discloses a method for producing an enhanced soil carbon sequestration material by using an ultrasonic cavitation process and a product thereof. The method comprises the following steps: (1) respectively grinding one or more than two raw materials selected from silicate minerals, construction wastes and industrial wastes and an alkaline material into powder with the particle size of less than 1mm by using a zirconium oxide ball mill, and uniformly mixing the powder with water; (2) treating a mixture of the obtained powder and water for 5-30 minutes at 10-150 kHz by using ultrasonic equipment, drying a solid-liquid mixture after ultrasonic treatment at 90 DEG C, then ball-milling until the particle size is less than 1 mm, and finally mixing and compounding with an organic matter according to the weight ratio of the dried product to the organic matter being 10: (0.1-10) to obtain the enhanced soil carbon sequestration material. The CO2 fixation efficiency of the enhanced soil inorganic carbon fixation material can reach 95% or above of the theoretical total carbon fixation amount of silicate minerals, the pH value of soil is remarkably increased by 0.5-1.3 units, the organic matter content is increased by 135% or above, the industrial production efficiency is high, and the energy consumption is lower.

Description

Technical Field

[0001] The present invention relates to a method for producing an enhanced soil carbon sequestration material using an ultrasonic cavitation process, and also relates to a product prepared by the method. The present invention belongs to the technical field of soil improvement. Background Art

[0002] Soil is the largest active carbon reservoir in Earth's terrestrial system, and through scientific management, its enormous carbon sequestration capacity can be unleashed. Inorganic carbon, a stable carbonate, is not susceptible to microbial decomposition or oxidation, enabling the permanent solidification and storage of CO2. Developing soil inorganic carbon sequestration materials is a key approach to addressing global climate change and achieving carbon neutrality.

[0003] Existing carbon sequestration technologies using silicate minerals have low carbon sequestration efficiency. For example, patent publication number CN 119631632 A discloses a method for mitigating soil acidification and increasing soil-fixed inorganic carbon content, but only states that the ground wollastonite particle size is less than 1 mm. This method only involves passive carbon sequestration, resulting in low carbon sequestration efficiency and unclear production processes.

[0004] Therefore, there is an urgent need to develop a carbon-fixing material that can effectively react with CO2 in the atmosphere and fix it into inorganic carbon. Summary of the Invention

[0005] The present invention aims to provide a method and product for producing an enhanced soil carbon sequestration material using ultrasonic cavitation technology. When applied to soil, the carbon sequestration material reacts with atmospheric CO₂ and fixes it into inorganic carbon. Some of this fixed inorganic carbon is stably stored in the soil system, while the remainder enters rivers and ultimately flows into the ocean, Earth's largest carbon reservoir. Simultaneously, this material balances soil acidity and bases, replenishes nutrients, and improves soil fertility.

[0006] In order to achieve the above object, the present invention adopts the following technical means: The present invention provides a method for producing an enhanced soil carbon sequestration material using an ultrasonic cavitation process, comprising the following steps: (1) Grinding one or more raw materials selected from silicate minerals, construction waste, and industrial waste and an alkaline material into powders with a particle size of less than 1 mm using a zirconia ball mill, and uniformly mixing the powders with water; (2) The mixture of the powder obtained in step (1) and water is treated with an ultrasonic device at 10-150 kHz for 5-30 minutes, the solid-liquid mixture after ultrasonication is dried at 90°C and then ball-milled again to a particle size of less than 1 mm to obtain a dried product; (3) According to the weight ratio of drying product to organic matter = 10:0.1-10, the drying product is mixed with organic matter to obtain enhanced soil carbon sequestration material.

[0007] Among them, preferably, the silicate minerals include feldspar, basalt, olivine, wollastonite, serpentine, diopside, quartz, mica, talc, kaolinite, montmorillonite, and zeolite; the construction waste includes waste concrete, waste glass, waste bricks and stones, waste tiles, and waste mortar; the industrial waste includes coal gangue, fly ash, coal slag, blast furnace slag, and steel slag; the alkaline material refers to a substance with strong alkalinity, including CaO, Ca(OH)2, KOH, carbide slag, and red mud; and the organic matter is decomposed plant residues and animal feces.

[0008] Among them, preferably, the weight ratio of one or more raw materials selected from silicate minerals, construction waste, and industrial waste, the alkaline material, and water is 1:0.5:3.

[0009] Among them, preferably, one or more raw materials selected from silicate minerals, construction waste, and industrial waste and the alkaline material are ground into powder with a particle size of 100 nm using a zirconia ball mill; the ultrasonic frequency is set to 80 kHz, and the ultrasonic treatment time is 5 min.

[0010] Wherein, preferably, the organic matter is decomposed pig manure, which is prepared according to the following method: 1) Weigh the raw materials according to the following weight percentages: Main ingredient: Pig manure accounts for 80% Auxiliary materials: straw accounts for 19% Specific decomposing compound bacteria agent: The specific decomposing compound bacteria agent accounts for 1%, and according to the weight percentage, the specific decomposing compound bacteria agent is composed of 50% Brazilian Azospirillum ( Azospirillum brasilense ), 20% Aspergillus niger ( Aspergillus niger ), 15% thermostable actinomycetes ( Thermoactinomyces vulgaris ), 15% jelly-like Paenibacillus ( Paenibacillus mucilaginosus )composition; 2) Fermentation: The main ingredients and auxiliary ingredients are mixed evenly, and the moisture content is maintained at 50%. In the initial stage of fermentation, Azospirillum brasiliensis and Aspergillus niger are added. During the high temperature period, thermostable actinomycetes are added. During the cooling period, jelly-like Paenibacillus is added. After the temperature reaches 55°C, the pile is turned over daily until the material is loose and odorless, and white or grayish white mycelium appears on the surface, thereby obtaining the decomposed pig manure.

[0011] Among them, preferably, the strain accession number of the brazilian Azospirillum is ATCC 29145, the strain accession number of Aspergillus niger is CGMCC No. 3.795, the strain accession number of the thermostable actinomycetes is CGMCC No. 4.6407, and the strain accession number of the jelly-like bacillus is CGMCC No. 1.232.

[0012] In a specific embodiment of the present invention, preferably, the method comprises the following steps: (1) Preparation of decomposed pig manure: Main ingredient: Pig manure accounts for 80% Auxiliary materials: straw accounts for 19% Specific decomposition compound bacterial agent: The specific decomposition compound bacterial agent accounts for 1%. According to the weight percentage, the specific decomposition compound bacterial agent is composed of 50% of Azospirillum brasiliensis with a preservation number of ATCC 29145, 20% of Aspergillus niger with a preservation number of CGMCC No.3.795, 15% of thermostable actinomycetes with a preservation number of CGMCC No.4.6407, and 15% of Paenibacillus jelly with a preservation number of CGMCC No.1.232; 2) Fermentation: Mix the main ingredients and auxiliary materials evenly, maintaining a moisture content of 50%. At the beginning of fermentation, add Azospirillum brasiliensis with a preservation number of ATCC29145 and Aspergillus niger with a preservation number of CGMCC No. 3.795. During the high temperature period, add thermostable actinomycetes with a preservation number of CGMCC No. 4.6407. During the cooling period, add Paenibacillus jelly with a preservation number of CGMCC No. 1.232. The pile should be 1.6 meters high. After the temperature reaches 55°C, turn the pile daily until the material is loose and odorless, and white or grayish white mycelium appears on the surface. (2) Production of enhanced soil carbon sequestration materials using ultrasonic cavitation technology Olivine and carbide slag were ball-milled to 100 nm using a zirconia ball mill and then mixed evenly with water at a weight ratio of 1:0.5:3 at room temperature. An ultrasonic cavitation machine was placed in the mixture and stirred at a constant speed with a frequency of 80 kHz and an ultrasonic treatment time of 5 min. The treated mixture was placed in an oven and dried at 90°C for 10 h. The dried product was ball-milled again to 100 nm and finally mixed with decomposed pig manure at a weight ratio of dried product: decomposed pig manure = 6:1 to produce an enhanced soil carbon sequestration material.

[0013] Furthermore, the present invention also proposes an enhanced soil carbon sequestration material prepared according to the method.

[0014] Furthermore, the present invention also proposes the use of the enhanced soil carbon sequestration material in CO2 fixation.

[0015] Among them, preferably, the enhanced soil carbon sequestration material is spread on the surface of the soil of agricultural land at an application rate of 1-10 tons / hectare as base fertilizer and plowed to 20-30 cm, or is directly spread on the surface of the soil of agricultural land at an application rate of 1-5 tons / hectare as topdressing.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention utilizes an ultrasonic cavitation process to produce enhanced soil carbon sequestration materials. The high-frequency vibrations of ultrasound can disrupt the crystal structure of raw materials, such as silicate minerals, causing cavitation damage, releasing internal active sites, and promoting the dissolution of metallic elements such as Ca and Mg. Furthermore, the surface area of ​​mineral particles increased by cavitation damage increases their contact area with CO2, improving reaction efficiency. Furthermore, ultrasonic treatment can introduce defects into the mineral surface, promoting chemical reactions. The carbon sequestration material produced by this invention can be applied as a base fertilizer at a rate of 1-10 tons / hectare, spread onto the surface of agricultural soil, and plowed to a depth of 20-30 cm. Alternatively, it can be applied as a topdressing fertilizer at a rate of 1-5 tons / hectare, directly spread onto the surface of agricultural soil. The enhanced soil inorganic carbon sequestration material produced by this invention boasts a carbon sequestration efficiency (540 kg / t) that is over 28% higher than that of carbon sequestration materials produced by directly mixing raw materials (420 kg / t). The CO2 sequestration efficiency can reach over 95% of the theoretical total carbon sequestration capacity of silicate minerals. In terms of improving soil physical and chemical properties, the soil pH is significantly increased by 0.5-1.3 units and the organic matter content is increased by more than 135%. Industrial production efficiency is high and energy consumption is reduced. DETAILED DESCRIPTION

[0017] The experimental method of the present invention is described in detail below in conjunction with the examples to more clearly illustrate its technical features and implementation steps. It should be understood by those skilled in the art that the embodiments are merely typical examples of the present invention and do not constitute any limitation to the scope of the present invention. Without departing from the spirit and scope of the present invention, the technical details may be adjusted or replaced, and these adjustments and replacements all fall within the scope of protection of the present invention.

[0018] The experimental strains involved in the following embodiments or experimental examples are: Azospirillum brasiliensis ( Azospirillum brasilense ): The accession number is ATCC 29145, purchased from ATCC cell bank; Aspergillus niger ( Aspergillus niger ): The accession number is CGMCC No. 3.795, purchased from China General Microbiological Culture Collection Center; Thermotolerant actinomycetes ( Thermoactinomyces vulgaris ) Select Streptomyces griseorhizoides ( Streptomyces griseorubens ): The deposit number is CGMCC No.4.6407, purchased from China General Microbiological Culture Collection Center; Paenibacillus jelly-like Paenibacillus mucilaginosus ): The accession number is CGMCC No.1.232, purchased from China General Microbiological Culture Collection Center.

[0019] Example 1 Preparation of Enhanced Soil Carbon Sequestration Material 1. Preparation of decomposed pig manure 1) Weigh the raw materials according to the following weight percentages: Main ingredient: Pig manure accounts for 80% Auxiliary materials: straw accounts for 19% Specific composting compound bacterial agent: The specific composting compound bacterial agent accounts for 1%, and according to the weight percentage, the specific composting compound bacterial agent is composed of 50% of the Brazilian nitrogen-fixing spirulina with the preservation number of ATCC 29145, 20% of the black aspergillus with the preservation number of CGMCC No.3.795, and 15% of the thermostable actinomycete with the preservation number of CGMCC No.4.6407 (i.e., Streptomyces griseus rhodochrous ( Streptomyces griseorubens )), 15% of the jelly-like Paenibacillus with the deposit number of CGMCC No. 1.232; 2) Fermentation: Mix the main ingredients and auxiliary materials evenly, maintaining a moisture content of 50%. At the beginning of fermentation, add Azospirillum brasiliensis with a preservation number of ATCC29145 and Aspergillus niger with a preservation number of CGMCC No. 3.795. During the high temperature period, add thermostable actinomycetes with a preservation number of CGMCC No. 4.6407. During the cooling period, add Paenibacillus jelly with a preservation number of CGMCC No. 1.232. The pile should be 1.6 meters high. After the temperature reaches 55°C, turn the pile daily until the material is loose and odorless, and white or grayish white mycelium appears on the surface. 2. Using ultrasonic cavitation technology to produce enhanced soil carbon sequestration materials Olivine and carbide slag were ball-milled to 100 nm using a zirconia ball mill and then mixed with water at a weight ratio of 1:0.5:3 at room temperature. An ultrasonic cavitation machine was placed within the mixture, stirring it at a constant speed at a frequency of 10 kHz for 30 minutes. The treated mixture was then dried in an oven at 90°C for 10 hours. The dried product was ball-milled again to 100 nm. Finally, the product was mixed with decomposed pig manure at a weight ratio of 6:1 to produce an enhanced carbon-storage material.

[0020] Example 2 Preparation of Enhanced Soil Carbon Sequestration Material 1. Preparation of decomposed pig manure: Same as Example 1.

[0021] 2. Using ultrasonic cavitation technology to produce enhanced soil carbon sequestration materials Olivine and carbide slag were ball-milled to 100 nm using a zirconia ball mill and then mixed with water at a weight ratio of 1:0.5:3 at room temperature. An ultrasonic cavitation machine was placed within the mixture, stirring it at a constant speed at 80 kHz for 5 minutes. The treated mixture was then dried in an oven at 90°C for 10 hours. The dried product was ball-milled again to 100 nm. Finally, the product was mixed with decomposed pig manure at a weight ratio of 6:1 to produce an enhanced carbon-storage material.

[0022] Example 3 Preparation of Enhanced Soil Carbon Sequestration Material 1. Preparation of decomposed pig manure: Same as Example 1.

[0023] 2. Using ultrasonic cavitation technology to produce enhanced soil carbon sequestration materials Olivine and carbide slag were ball-milled to 100 nm using a zirconia ball mill and then mixed with water at a weight ratio of 1:0.5:3 at room temperature. An ultrasonic cavitation machine was placed within the mixture, stirring it at a constant speed at a frequency of 30 kHz and for 20 minutes. The treated mixture was then dried in an oven at 90°C for 10 hours. The dried product was ball-milled again to 100 nm. Finally, the product was mixed with decomposed pig manure at a weight ratio of 6:1 to produce an enhanced carbon-storage material.

[0024] Example 4 Field experiment 1. Field experimental conditions: Location: Weifang, Shandong.

[0025] Soil background: pH 5.8, organic matter content 1.2%.

[0026] Crop: Corn.

[0027] Time: One corn planting cycle (120 days).

[0028] Example 1-3 The amount of carbon sequestration material added: 5 tons / hectare.

[0029] 2. The results of the field experiment are shown in Tables 1 and 2: ; ; It can be seen from the results in Tables 1 and 2 that the carbon sequestration efficiency of Example 2 is the highest. Therefore, the preparation method of Example 2 is selected as the most preferred preparation method of the enhanced soil carbon sequestration material of the present invention.

[0030] Experimental Example 1: Verification of the effect of carbon fixation material particle size on carbon fixation efficiency 1. Experimental Grouping Experimental group 1: olivine (ground to a particle size of 1 mm) + carbide slag, weight ratio 1:0.5.

[0031] Experimental group 2: olivine (ball-milled to a particle size of 100 nm) + carbide slag, weight ratio 1:0.5.

[0032] 2. Field experimental conditions: Location: Weifang, Shandong.

[0033] Soil background: pH 5.8, organic matter content 1.2%.

[0034] Crop: Corn.

[0035] Time: One corn planting cycle (120 days).

[0036] Amount of carbon sequestration materials added: 5 tons / hectare.

[0037] The results of the field experiment are shown in Table 3: ; Note: Carbon sequestration efficiency = actual carbon sequestration amount / theoretical carbon sequestration amount From the results in Table 1, it can be concluded that when the particle size of the carbon-fixing material is 100 nm, the carbon-fixing efficiency is higher.

[0038] Experimental Example 2: Synergistic Effect of Adding Mature Organic Matter on Carbon Sequestration and Soil Improvement 1. Experimental Grouping Experimental group 1: olivine (particle size 100 nm) + carbide slag, weight ratio 1:0.5, no organic matter.

[0039] Experimental Group 2: Olivine (particle size 100 nm) + carbide slag + decomposed pig manure. Weight ratio: 1:0.5:0.25.

[0040] 2. Preparation of decomposed pig manure 1) Weigh the raw materials according to the following weight percentages: Main ingredient: Pig manure accounts for 80% Auxiliary materials: straw accounts for 19% Specific decomposition compound bacterial agent: The specific decomposition compound bacterial agent accounts for 1%, and the specific decomposition compound bacterial agent is composed of 50% of Azospirillum brasiliensis with a preservation number of ATCC 29145, 20% of Aspergillus niger with a preservation number of CGMCC No. 3.795, 15% of thermostable actinomycetes with a preservation number of CGMCC No. 4.6407, and 15% of Paenibacillus jelly with a preservation number of CGMCC No. 1.232; 2) Fermentation: Mix the main ingredients and auxiliary materials evenly, maintaining a moisture content of 50%. At the beginning of fermentation, add Azospirillum brasiliensis with a preservation number of ATCC29145 and Aspergillus niger with a preservation number of CGMCC No. 3.795. During the high temperature period, add thermostable actinomycetes with a preservation number of CGMCC No. 4.6407. During the cooling period, add Paenibacillus jelly with a preservation number of CGMCC No. 1.232. The pile height is 1.6m. After the temperature reaches 55°C, turn the pile daily until the material is loose and odorless, and white or grayish white mycelium appears on the surface.

[0041] 3. Field experimental conditions: Location: Weifang, Shandong.

[0042] Soil background: pH 5.8, organic matter content 1.2%.

[0043] Crop: Corn.

[0044] Time: One corn planting cycle (120 days).

[0045] Amount of carbon sequestration materials added: 5 tons / hectare.

[0046] The results of the field experiment are shown in Table 4: ; Experimental Example 3: Effect of organic matter composting process on carbon sequestration efficiency 1. Experimental Grouping Experimental group 1: olivine (particle size 100 nm) + carbide slag + conventionally decomposed pig manure, weight ratio 1:0.5:0.25 Experimental group 2: olivine (particle size 100 nm) + carbide slag + decomposed pig manure. Weight ratio 1:0.5:0.25 2. Preparation of decomposed pig manure (1) Fermentation process of experimental group 1: 1) Weigh the raw materials according to the following weight percentages: Main ingredient: Pig manure accounts for 80% Auxiliary materials: straw accounts for 19% Specific composting composite bacterial agent: The specific composting composite bacterial agent accounts for 1%, and the specific composting composite bacterial agent is composed of 50% of Brazilian Azospirillum with a preservation number of ATCC 29145, 20% of Aspergillus niger with a preservation number of CGMCC No. 3.795, 15% of thermostable actinomycetes with a preservation number of CGMCC No. 4.6407, and 15% of jelly-like Bacillus with a preservation number of CGMCC No. 1.232.

[0047] 2) Fermentation: Mix the main ingredients, auxiliary materials and specific composting compound bacteria evenly, keep the moisture content at 50%, and pile height at 1.6m. After heating to 55℃, turn the pile every day until the material is loose and odorless, and white or grayish white mycelium appears on the surface.

[0048] (2) Fermentation process of experimental group 2: 1) Weigh the raw materials according to the following weight percentages: Main ingredient: Pig manure accounts for 80% Auxiliary materials: straw accounts for 19% Specific decomposition compound bacterial agent: The specific decomposition compound bacterial agent accounts for 1%, and the specific decomposition compound bacterial agent is composed of 50% of Azospirillum brasiliensis with a preservation number of ATCC 29145, 20% of Aspergillus niger with a preservation number of CGMCC No. 3.795, 15% of thermostable actinomycetes with a preservation number of CGMCC No. 4.6407, and 15% of Paenibacillus jelly with a preservation number of CGMCC No. 1.232; 2) Fermentation: Mix the main ingredients and auxiliary materials evenly, maintaining a moisture content of 50%. At the beginning of fermentation, add Azospirillum brasiliensis with a preservation number of ATCC29145 and Aspergillus niger with a preservation number of CGMCC No. 3.795. During the high temperature period, add thermostable actinomycetes with a preservation number of CGMCC No. 4.6407. During the cooling period, add Paenibacillus jelly with a preservation number of CGMCC No. 1.232. The pile should be 1.6 meters high. After the temperature reaches 55°C, turn the pile daily until the material is loose and odorless, and white or grayish white mycelium appears on the surface.

[0049] 3. Field experiment: Location: Weifang, Shandong.

[0050] Soil background: pH 5.8, organic matter content 1.2%.

[0051] Crop: Corn.

[0052] Time: One corn planting cycle (120 days).

[0053] Amount of carbon sequestration materials added: 5 tons / hectare.

[0054] The results of the field experiment are shown in Table 5: ; Experimental Example 4 Effect of ultrasonic treatment on carbon fixation efficiency 1. Experimental Grouping Experimental Group: Olivine and carbide slag were ball-milled to 100 nm using a zirconia ball mill and then mixed with water at a weight ratio of 1:0.5:3 at room temperature. An ultrasonic cavitation machine was placed within the mixture, stirring it at a constant speed at 80 kHz for 5 minutes. The treated mixture was oven-dried at 90°C for 10 hours. The dried product was ball-milled again to 100 nm. Finally, the enhanced carbon-storage material was prepared by mixing it with decomposed pig manure (prepared as in Experimental Example 2) at a weight ratio of 6:1.

[0055] Control group: Olivine and carbide slag were ball-milled to 100 nm using a zirconia ball mill. The mixture was then mixed with water at a weight ratio of 1:0.5:3 at room temperature. After 30 minutes, the mixture was dried in an oven at 90°C for 10 hours. The dried product was ball-milled again to 100 nm. Finally, the carbon-storing material was mixed with decomposed pig manure (prepared as in Experimental Example 2) at a weight ratio of 6:1.

[0056] 2. Field experiments Location: Weifang, Shandong.

[0057] Soil background: pH 5.8, organic matter content 1.2%.

[0058] Crop: Corn.

[0059] Time: One corn planting cycle (120 days).

[0060] Amount of carbon sequestration materials added: 5 tons / hectare.

[0061] The results of the field experiment are shown in Table 6: .

Claims

1. A method for producing enhanced soil carbon sequestration materials using ultrasonic cavitation technology, characterized in that: The method comprises the following steps: (1) Grinding one or more raw materials selected from silicate minerals, construction waste, and industrial waste and an alkaline material into powders with a particle size of less than 1 mm using a zirconia ball mill, and uniformly mixing the powders with water; (2) The mixture of the powder obtained in step (1) and water is treated with an ultrasonic device at 10-150 kHz for 5-30 min, the solid-liquid mixture after ultrasonication is dried at 90°C and then ball-milled again to a particle size of less than 1 mm to obtain a dried product; (3) According to the weight ratio of drying product to organic matter = 10:0.1-10, the drying product is mixed with organic matter to obtain enhanced soil carbon sequestration material.

2. The method according to claim 1, wherein The silicate minerals include feldspar, basalt, olivine, wollastonite, serpentine, diopside, quartz, mica, talc, kaolinite, montmorillonite, and zeolite; the construction waste includes waste concrete, waste glass, waste bricks and stones, waste tiles, and waste mortar; the industrial waste includes coal gangue, fly ash, coal slag, blast furnace slag, and steel slag; the alkaline materials refer to substances with strong alkalinity, including CaO, Ca(OH)2, KOH, carbide slag, and red mud; the organic matter is decomposed plant residues and animal feces.

3. The method according to claim 1, wherein The weight ratio of one or more raw materials selected from silicate minerals, construction waste, and industrial waste, the alkaline material, and water is 1:0.5:

3.

4. The method according to claim 1, wherein One or more raw materials selected from silicate minerals, construction waste, and industrial waste and an alkaline material are ground into powders with a particle size of 100 nm using a zirconia ball mill; the ultrasonic frequency is set to 80 kHz, and the ultrasonic treatment time is 5 min.

5. The method according to claim 1, wherein The organic matter is decomposed pig manure, which is prepared according to the following method: 1) Weigh the raw materials according to the following weight percentages: Main ingredient: Pig manure accounts for 80% Auxiliary materials: straw accounts for 19% Specific decomposing compound bacteria agent: The specific decomposing compound bacteria agent accounts for 1%, and according to the weight percentage, the specific decomposing compound bacteria agent is composed of 50% Brazilian Azospirillum ( Azospirillum brasilense ), 20% Aspergillus niger ( Aspergillus niger ), 15% thermostable actinomycetes ( Thermoactinomyces vulgaris ), 15% jelly-like Paenibacillus ( Paenibacillus mucilaginosus )composition; 2) Fermentation: The main ingredients and auxiliary ingredients are mixed evenly, and the moisture content is maintained at 50%. In the initial stage of fermentation, Azospirillum brasiliensis and Aspergillus niger are added. During the high temperature period, thermostable actinomycetes are added. During the cooling period, jelly-like Paenibacillus is added. After the temperature reaches 55°C, the pile is turned over daily until the material is loose and odorless, and white or grayish white mycelium appears on the surface, thereby obtaining the decomposed pig manure.

6. The method according to claim 5, wherein The strain accession number of the brazilian Azospirillum is ATCC29145, the strain accession number of Aspergillus niger is CGMCC No. 3.795, the strain accession number of the thermostable actinomycetes is CGMCC No. 4.6407, and the strain accession number of the jelly-like bacillus is CGMCC No. 1.

232.

7. The method according to any one of claims 1 to 6, wherein: The method comprises the following steps: (1) Preparation of decomposed pig manure 1) Weigh the raw materials according to the following weight percentages: Main ingredient: Pig manure accounts for 80% Auxiliary materials: straw accounts for 19% Specific decomposition compound bacterial agent: The specific decomposition compound bacterial agent accounts for 1%. According to the weight percentage, the specific decomposition compound bacterial agent is composed of 50% of Azospirillum brasiliensis with a preservation number of ATCC 29145, 20% of Aspergillus niger with a preservation number of CGMCC No. 3.795, 15% of thermostable actinomycetes with a preservation number of CGMCC No. 4.6407, and 15% of Paenibacillus jelly with a preservation number of CGMCC No. 1.232; 2) Fermentation: Mix the main ingredients and auxiliary materials evenly, maintaining a moisture content of 50%. At the beginning of fermentation, add Azospirillum brasiliensis with a preservation number of ATCC 29145 and Aspergillus niger with a preservation number of CGMCC No. 3.

795. During the high temperature period, add thermostable actinomycetes with a preservation number of CGMCC No. 4.6407. During the cooling period, add Paenibacillus jelly with a preservation number of CGMCC No. 1.

232. The pile should be 1.6 meters high. After the temperature reaches 55°C, turn the pile daily until the material is loose and odorless, and white or grayish white mycelium appears on the surface. (2) Production of enhanced soil carbon sequestration materials using ultrasonic cavitation technology Olivine and carbide slag were respectively ball-milled to 100 nm using a zirconia ball mill and then mixed evenly with water at a weight ratio of 1:0.5:3 at room temperature. An ultrasonic cavitation machine was placed in the mixture and stirred at a constant speed with a frequency set to 80 kHz and an ultrasonic treatment time of 5 min. The treated mixture was placed in an oven and dried at 90°C for 10 h. The dried product was ball-milled again to 100 nm and finally mixed with decomposed pig manure at a weight ratio of dried product: decomposed pig manure = 6:1 to prepare an enhanced soil carbon sequestration material.

8. An enhanced soil carbon sequestration material prepared according to the method according to any one of claims 1 to 7.

9. Use of the enhanced soil carbon sequestration material according to claim 8 in CO2 fixation.

10. The use according to claim 9, characterized in that The enhanced soil carbon sequestration material is spread on the surface of the agricultural land soil at an application rate of 1-10 tons / hectare as base fertilizer and plowed to 20-30 cm, or is directly spread on the surface of the agricultural land soil at an application rate of 1-5 tons / hectare as topdressing fertilizer.