Method for efficiently preparing soy-derived fulvic acid from solid waste of a soy product factory based on a cyclic catalytic system and application thereof

Abstract

The application discloses a kind of based on cyclic catalytic system's soy product factory solid waste high-efficiency preparation bean source fulvic acid method and application, belong to solid waste resource technology field.The application uses manganese ferrite and magnetite as composite recyclable catalyst, in combination with stirring, ultrasonic, magnetic separation recovery process, with the directional conversion of soy product factory solid waste into high-purity fulvic acid product.The application realizes harmless disposal and high-value resource utilization of soy product factory solid waste, product quality is stable, high in purity, applied to agricultural production and environmental management field;On the basis of solid waste resource, synchronous realization of soil carbon sequestration and ecological improvement, give consideration to solid waste utilization and carbon reduction benefit, solve the industry problem of difficult disposal, low resource utilization rate of soy product factory solid waste.

Description

Technical Field

[0001] This invention relates to the field of solid waste resource utilization technology, specifically to a method and application for the efficient preparation of soybean-derived humic acid from solid waste in soybean product factories based on a circular catalytic system. Background Technology

[0002] Solid waste from soybean product factories is classified as high-organic-matter solid waste in the agricultural and sideline food processing category. It is primarily generated during production processes such as soybean soaking, grinding, boiling, and pressing, as well as auxiliary processes like equipment cleaning. This solid waste is rich in protein, polysaccharides, starch, oil, and nutrients such as nitrogen, phosphorus, and potassium, exhibiting excellent biochemical properties. If disposed of using extensive methods such as open-air storage or simple landfilling, it will not only pollute the soil and groundwater, inducing environmental problems such as eutrophication, soil degradation, and unpleasant odors in the factory area, but also cause a significant depletion of organic carbon resources, contradicting the dual-carbon goals and the direction of green and circular development in the soybean product industry.

[0003] At present, the solid waste disposal and resource utilization technologies in the soybean product industry have two major shortcomings. The mainstream traditional end-of-pipe treatment processes such as landfill, composting, incineration, and conventional anaerobic digestion can only meet the basic requirements of solid waste reduction and harmlessness. They generally suffer from high energy consumption, high operating costs, and high risk of secondary pollution, making it difficult to achieve organic carbon retention and high-value resource utilization of solid waste. Among them, the incineration process directly converts the organic carbon of solid waste into carbon dioxide emissions, exacerbating the industry's carbon footprint. Conventional composting and anaerobic digestion have low utilization of organic components, large amounts of organic carbon loss, weak carbon sequestration capacity, low added value of products, and unstable quality. At the same time, the existing supporting technologies for preparing fulvic acid based on this type of solid waste also have obvious defects. Most processes only focus on the harmless and volume reduction treatment of solid waste, and cannot achieve the targeted and efficient conversion of organic carbon into highly active fulvic acid. The carbon loss rate is high and the carbon fixation effect is poor. The finished fulvic acid lacks active functional groups, and the conversion rate and purity are low. The effectiveness of agricultural application in the field is limited. Moreover, the stability of the whole process is insufficient and it is difficult to implement on a large scale. It cannot achieve the synergistic adaptation of deep harmless treatment of solid waste, efficient organic carbon fixation and high-quality fulvic acid preparation, and it is difficult to meet the industry's hard requirements for low-carbon circular development.

[0004] This type of solid waste contains denatured proteins, polysaccharides, humic precursors, and other substances, along with abundant mineral nutrients and active colloids. Fulvic acid, as a green functional agricultural input, can slowly release nutrients, improve soil, and activate soil microbial communities, aligning with the modern agricultural ecological development concept. Against the backdrop of dual-carbon goals and the green transformation of solid waste, promoting the reduction, harmlessness, and high-value utilization of solid waste from soybean product factories, and overcoming the technical bottlenecks in the targeted conversion of organic carbon into high-quality fulvic acid, has become an urgent need for the industry. Therefore, there is an urgent need to develop a circular technology system integrating solid waste purification and impurity removal, organic carbon activation and conversion, carbon component stabilization and retention, and high-quality fulvic acid preparation. Summary of the Invention

[0005] To address the problems of long resource utilization and conversion cycles, low fulvic acid conversion rates, and poor fertilizer effects of solid waste from soybean product factories, this invention provides a method and application for the efficient preparation of soybean-derived fulvic acid from solid waste based on a circular catalytic system. This invention offers a circular technology system integrating solid waste purification and impurity removal, organic carbon activation and conversion, carbon component stabilization and retention, and high-quality fulvic acid preparation. This effectively solves the solid waste disposal problems of soybean product factories, improves organic carbon sequestration efficiency and farmland carbon sink capacity, promotes the deep integration of solid waste resource utilization and the dual-carbon strategy, and contributes to the low-carbon transformation of the food industry and the sustainable development of agriculture.

[0006] The present invention adopts the following technical solution: In a first aspect, the present invention provides a method for the efficient preparation of soybean-derived humic acid from solid waste of a soybean product factory based on a cyclic catalytic system, comprising the following steps: Step 1: Take solid waste from a soybean product factory with a moisture content of 80-85%, which is the material to be processed; Step 2: Add a composite catalyst composed of manganese ferrite and magnetite to the material to be treated obtained in Step 1, stir and mix evenly to obtain a mixture. Step 3: Perform ultrasonic activation treatment on the mixture obtained in Step 2; Step 4: Separate and recover manganese ferrite and magnetite from the ultrasonically activated mixture using magnetic adsorption. The recovered manganese ferrite and magnetite are recycled, and the remaining material is soybean-derived humic acid.

[0007] Preferably, in step 1, the solid waste from the soybean product factory is 300-400g.

[0008] Preferably, in step 2, the particle size of manganese ferrite (industrial grade purity) is 300-500 mesh, and the dosage is 6-8g; the particle size of magnetite (industrial grade purity) is 400-600 mesh, and the dosage is 10-15g; the stirring speed is 800rpm, and the time is 5min.

[0009] Preferably, in step 3, the power of the ultrasonic activation treatment is 30-60 kHz, and the treatment time is 20-40 min.

[0010] Preferably, in step 4, the magnetic flux density of the magnet used for magnetic adsorption is 500-1200 mT; and the number of times it is recycled is 10-15 times.

[0011] In a second aspect, the present invention provides a soybean-derived fulvic acid prepared by the above method, characterized in that the soybean-derived fulvic acid content is 15-20%.

[0012] A third aspect of the present invention provides an application of the above-mentioned soybean-derived fulvic acid, characterized in that it is used for crop planting and soil improvement, with a field application rate of 40-100 kg / mu, and is applied by burying combined with rotary tillage.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention provides a method for the efficient preparation of soybean-derived humic acid based on a cyclic catalytic system. The overall process time is less than 1 hour, which is much shorter than the traditional aerobic composting process cycle of 30-60 days, and the conversion efficiency is greatly improved.

[0014] 2. The conversion rate of residual organic matter after solid waste treatment in soybean product factories reaches 98-100%.

[0015] 3. Soybean-derived fulvic acid products contain 15-20% fulvic acid, which can increase the height of Shanghai bok choy by 5.82-17.14%, root length by 5.19-17.07%, chlorophyll content by 6.37-17.49%, and yield per plant by 3.25-10.00%, as well as the soil organic matter content by 4.68-14.24%. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the method for efficiently preparing soybean-derived fulvic acid from solid waste in a soybean product factory based on a cyclic catalytic system, and a picture of the soybean-derived fulvic acid product obtained. Figure 2 The images show a three-dimensional fluorescence comparison of soybean-derived humic acid prepared in Examples 1-3 of this invention with solid waste from a soybean product factory. Figure 3 The effect of soybean-derived humic acid prepared in Example 3 of this invention on the total organic carbon content of soil at different times; Figure 4 This is a comparison chart of the growth of Shanghai bok choy potted plants prepared with soybean-derived humic acid in Example 3 of the present invention, traditional organic fertilizer, and blank control group. Figure 5 A comparison chart of the plant height, root length, chlorophyll content and yield of soybean-derived fulvic acid prepared in Example 3 of the present invention with traditional organic fertilizer and blank group; Figure 6 This is a comparison of the scanning electron microscope morphology of uncirculated and 15-cycled manganese ferrite and magnetite used in Example 3 of the present invention. Figure 7 This is an elemental mapping diagram of unrecycled and 15-cycled manganese ferrite and magnetite used in Example 3 of the present invention; Figure 8 This is a graph showing the weight changes of manganese ferrite and magnetite used in Example 3 of the present invention after magnetic recovery. Detailed Implementation

[0017] To make the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0018] This invention provides a method and application for the efficient preparation of soybean-derived fulvic acid from solid waste in soybean product factories based on a circular catalytic system. This invention uses manganese ferrite and magnetite as a composite recyclable catalyst, combined with stirring, ultrasonication, and magnetic separation recovery processes, to directionally convert solid waste from soybean product factories into high-purity fulvic acid products, such as… Figure 1 As shown. This invention enables the harmless disposal and high-value resource utilization of solid waste from soybean product factories, resulting in stable product quality and high purity, applicable to agricultural production and environmental governance. Simultaneously, it achieves soil carbon sequestration and ecological improvement based on solid waste resource utilization, balancing solid waste utilization with carbon reduction and emission reduction benefits, thus solving the industry problems of difficult solid waste disposal and low resource utilization rate in soybean product factories.

[0019] Example 1 This invention provides a method for the efficient preparation of soybean-derived humic acid from solid waste in a soybean product factory based on a cyclic catalytic system, comprising the following steps: Step (1): Take 400g of solid waste from the bean product factory (moisture content 80%), which is the material to be processed; Step (2): Add 6g of manganese ferrite (300 mesh, industrial grade purity) and 10g of magnetite (400 mesh, industrial grade purity) to the material to be treated obtained in step (1) and stir (800 rpm, 5 min) until uniform to obtain a mixture. Step (3): The mixture from step (2) is ultrasonically treated (power 30kHz) for 20 minutes; Step (4): The product obtained in step (3) is adsorbed and recovered using a magnet (magnetic flux density 500 mT). The manganese ferrite and magnetite can be recycled up to 10 times. The remaining product is soybean-derived fulvic acid. Three-dimensional fluorescence analysis is as follows: Figure 2 As shown, the fulvic acid content reaches 15%.

[0020] The prepared soybean-derived humic acid was evenly applied to the soil surface at a rate of 40 kg / mu, followed by rotary tillage and planting of Shanghai bok choy. Compared with the application of the same amount of traditional organic fertilizer, Shanghai bok choy plant height increased by 5.82%, root length increased by 5.19%, chlorophyll content increased by 6.37%, yield per plant increased by 3.25%, and soil organic matter content increased by 4.68%.

[0021] Example 2 This invention provides a method for the efficient preparation of soybean-derived humic acid from solid waste in a soybean product factory based on a cyclic catalytic system, comprising the following steps: Step (1): Take 350g of solid waste from the bean product factory (moisture content 80%), which is the material to be processed; Step (2): Add 7g of manganese ferrite (300 mesh, industrial grade purity) and 13g of magnetite (400 mesh, industrial grade purity) to the material to be treated obtained in step (1) and stir (800 rpm, 5 min) until uniform to obtain a mixture. Step (3): The mixture from step (2) is ultrasonically treated for 30 minutes using ultrasound (power 50kHz); Step (4): The product obtained in step (3) is adsorbed and recovered using a magnet (magnetic flux density 800 mT). The manganese ferrite and magnetite can be recycled up to 10 times. The remaining product is soybean-derived fulvic acid. Three-dimensional fluorescence analysis is as follows: Figure 2 As shown, the fulvic acid content reaches 17%.

[0022] The prepared soybean-derived humic acid was evenly applied to the soil surface at a rate of 70 kg / mu, followed by rotary tillage and planting of Shanghai bok choy. Compared with the application of the same amount of traditional organic fertilizer, the plant height of Shanghai bok choy increased by 11.35%, root length by 10.28%, chlorophyll content by 12.61%, yield per plant increased by 6.72%, and soil organic matter content increased by 9.53%.

[0023] Example 3 This invention provides a method for the efficient preparation of soybean-derived humic acid from solid waste in a soybean product factory based on a cyclic catalytic system, comprising the following steps: Step (1): Take 300g of solid waste from the bean product factory (moisture content 80%), which is the material to be processed; Step (2): Add 8g of manganese ferrite (300 mesh, industrial grade purity) and 15g of magnetite (400 mesh, industrial grade purity) to the material to be treated obtained in step (1) and stir (800 rpm, 5 min) until uniform to obtain a mixture. Step (3): The mixture from step (2) is ultrasonically treated for 40 minutes using ultrasound (power 60kHz); Step (4): The product obtained in step (3) is adsorbed and recovered using a magnet (magnetic flux density 1200 mT) to recover manganese ferrite and magnetite. Manganese ferrite and magnetite can be recycled and reused up to 15 times. The remaining product is soybean-derived fulvic acid. Three-dimensional fluorescence analysis is as follows: Figure 2 As shown, the fulvic acid content reaches 20%.

[0024] Two equal amounts of soil were taken and divided into a control group (without genus-derived fulvic acid) and an experimental group (with genus-derived fulvic acid). Total organic carbon was measured periodically. Figure 3 As shown, the initial carbon content of the two groups was the same. As the incubation time increased, the organic carbon in the blank group was slowly depleted, while the organic carbon content in the experimental group continued to rise. This shows that soybean-derived humic acid can enrich soil organic carbon and improve the soil carbon sequestration effect, and the effect becomes more obvious with the extension of time.

[0025] The prepared soybean-derived humic acid was evenly applied to the soil surface at a rate of 100 kg / mu, followed by rotary tillage and planting of Shanghai bok choy. Figure 4 As shown. Compared with the application of the same amount of traditional organic fertilizer, Shanghai bok choy plant height increased by 17.14%, root length increased by 17.07%, chlorophyll content increased by 17.49%, and yield per plant increased by 10.00% (e.g., Figure 5 As shown in the figure, the soil organic matter content increased by 14.24%.

[0026] Example 3 represents the optimal process ratio (the catalyst is recycled the most times, such as...). Figure 6-8 As shown in the figure), the specific effects are shown in Table 1: Table 1. Comparison of soil indicators after application of soybean-derived fulvic acid (this product) prepared in Example 3 with the control group and traditional organic fertilizer.

[0027] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any form or substance. It should be noted that those skilled in the art can make various improvements and additions without departing from the present invention, and these improvements and additions should also be considered within the scope of protection of the present invention. Any modifications, alterations, and equivalent variations made by those skilled in the art based on the above-disclosed technical content without departing from the spirit and scope of the present invention are equivalent embodiments of the present invention; furthermore, any modifications, alterations, and variations made to the above embodiments based on the essential technology of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A method for efficiently preparing soybean-derived humic acid from solid waste in a soybean product factory based on a circular catalytic system, characterized in that, Includes the following steps: Step 1: Take solid waste from a soybean product factory with a moisture content of 80-85%, which is the material to be processed; Step 2: Add a composite catalyst composed of manganese ferrite and magnetite to the material to be treated obtained in Step 1, stir and mix evenly to obtain a mixture. Step 3: Perform ultrasonic activation treatment on the mixture obtained in Step 2; Step 4: Separate and recover manganese ferrite and magnetite from the ultrasonically activated mixture using magnetic adsorption. The recovered manganese ferrite and magnetite are recycled, and the remaining material is soybean-derived humic acid.

2. The method for efficiently preparing soybean-derived fulvic acid from solid waste in a soybean product factory based on a circulating catalytic system according to claim 1, characterized in that, In step 1, the solid waste from the soybean product factory is 300-400g.

3. The method for efficiently preparing soybean-derived humic acid from solid waste of a soybean product factory based on a circulating catalytic system according to claim 1, characterized in that, In step 2, the particle size of manganese ferrite is 300-500 mesh, and the dosage is 6-8g; the particle size of magnetite is 400-600 mesh, and the dosage is 10-15g; the stirring speed is 800rpm, and the time is 5min.

4. The method for efficiently preparing soybean-derived fulvic acid from solid waste of a soybean product factory based on a circulating catalytic system according to claim 1, characterized in that, In step 3, the ultrasonic activation treatment power is 30-60kHz, and the treatment time is 20-40min.

5. The method for efficiently preparing soybean-derived fulvic acid from solid waste of a soybean product factory based on a circulating catalytic system according to claim 1, characterized in that, In step 4, the magnetic flux density of the magnet used for magnetic adsorption is 500-1200 mT; the number of times it is recycled is 10-15 times.

6. A soybean-derived humic acid prepared by the method according to any one of claims 1-5, characterized in that, The humic acid content of soybeans is 15-20%.

7. An application of soybean-derived fulvic acid as described in claim 6, characterized in that, For crop planting and soil improvement, the field application rate is 40-100 kg / mu, and it is applied by burying and rotary tillage.

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