Method for treating pepper alkali waste liquid into fertilizer by pig manure water and synergistic compound microbial agent

Abstract

The application provides a method for preparing fertilizer by treating capsaicin waste liquid with pig manure water and synergistic compound microbial agent, and is characterized by the following steps: 1) uniformly mixing capsaicin crystallization refined waste liquid and pig manure water according to the following mass percentage: 30-60% of capsaicin crystallization refined waste liquid, 40-70% of pig manure water, and adjusting the pH value of the mixed solution to 6.0-9.0; 2) adding potassium fulvate in an amount of greater than or equal to 0.5 kg per ton of the mixed solution, then adding compound biological enzyme in an amount of 0.5 kg per ton of the mixed solution, and stirring and activating for 30-40 minutes; 3) adding compound microbial agent in an amount of greater than or equal to 0.5 kg per ton of the mixed solution, and aerating for 45-50 hours under the conditions of a temperature of 20-30 DEG C and dissolved oxygen of 2-4 mg / L; and 4) directly preparing organic water-soluble fertilizer or soil improvement base agent. The capsaicin degradation rate is greater than or equal to 70%, the COD removal rate is greater than or equal to 65%, the ammonia nitrogen removal rate is greater than or equal to 80%, and the method is suitable for large-scale industrial application.

Description

Technical Field

[0001] This invention relates to the technical field of harmless treatment and resource utilization of waste liquid generated during the deep processing of industrial chili peppers. Specifically, it relates to a method for rapidly degrading high-purity capsaicin crystallization and refining waste liquid at room temperature using pig manure as an auxiliary matrix, and then preparing organic water-soluble fertilizer through resource utilization. Background Technology

[0002] The deep processing of industrial chili peppers mainly falls into two categories: one is the crude extraction process aimed at extracting capsaicin oleoresin, with solid chili pepper residue as a byproduct. This residue is high in cellulose and low in salt, making it easy to use as animal feed or for simple composting, and has a relatively low technological threshold. The other is a fine chemical process involving extraction, concentration, crystallization, and recrystallization to prepare high-purity capsaicin crystals. The crystallization mother liquor and refined mixed waste liquid produced by this process are highly toxic, high-salt, high-viscosity, and difficult-to-degrade industrial waste liquids. These contain high concentrations of residual capsaicin, organic acid salts, high COD, and high color, exhibiting strong inhibitory and toxic effects on microorganisms. Conventional processes are difficult to degrade these waste liquids. Directly composting the chili pepper residue with this waste liquid would easily lead to soil salinization; direct discharge of this waste liquid would severely pollute water bodies and soil, resulting in extremely high environmental disposal costs. In short, conventional capsaicin waste liquid treatment methods suffer from low degradation efficiency, long cycles, high costs, and inability to be utilized as resources, making them unsuitable for industrial-scale treatment.

[0003] Pig manure is rich in carbon sources, nitrogen sources, trace elements and buffering substances. Existing technologies are mostly used to treat the pig manure itself and to prepare fertilizer from it.

[0004] Therefore, it is necessary to improve existing technologies. Summary of the Invention

[0005] To make resource-efficient use of capsaicin waste liquid and turn it into a valuable resource, this invention provides a method for comprehensively treating capsaicin waste liquid into fertilizer at room temperature, quickly, at low cost, and in a harmless manner, using pig manure as an auxiliary nutrient substrate, in order to solve practical technical problems in the industry.

[0006] The core objective of this invention is to treat high-purity capsaicin extraction and refining waste liquid, and to use pig manure water as an auxiliary nutrient buffer substrate to enhance the tolerance of microorganisms to the highly toxic environment of capsaicin waste liquid, improve the degradation efficiency of capsaicin waste liquid, and achieve room temperature, rapid and harmless treatment, so that the treated product can be used to prepare organic water-soluble fertilizer.

[0007] This invention is achieved through the following technical solution: a method for treating capsaicin wastewater to produce fertilizer using pig manure and a compound microbial agent, characterized by comprising the following steps: 1) Mix capsaicin waste liquid and pig manure water evenly according to the following mass percentages: capsaicin waste liquid: 30–60%, pig manure water: 40–70%. Adjust the pH value of the mixture to 6.0–9.0 with an acid-base adjuster to obtain the mixture. 2) Add potassium humate to the mixture obtained in step (1) at a rate of ≥0.5 kg / ton of mixture, and then add compound biological enzyme at a rate of 0.5 kg / ton of mixture. Stir and activate for 30–40 minutes to obtain activated mixture. 3) Add compound microbial agent to the activated mixture obtained in step (2) at a rate of ≥0.5 kg / ton of mixture, and aerate for 45–50 hours under the conditions of 20–30℃ and dissolved oxygen 2–4 mg / L to obtain a harmless treatment liquid; 4) After filtering the harmless treatment liquid obtained in step (3), it is directly prepared as organic water-soluble fertilizer or soil amendment substrate.

[0008] Further, the acid-base regulator mentioned in step (1) is one of potassium carbonate, potassium bicarbonate, sodium carbonate, sodium bicarbonate, potassium hydroxide, and sodium hydroxide.

[0009] Furthermore, the potassium humate in step 2) is either molasses-derived potassium humate or mineral-derived potassium humate; preferably, molasses-derived potassium humate has good water solubility, high content of small molecule organic matter, low impurity content, and better compatibility with other components in the mixture, which can improve the stability and degradation synergy of the mixture.

[0010] Further, the compound biological enzyme in step 2) is composed of cellulase and laccase in a mass ratio of 2:1, with cellulase activity ≥10000 U / g and laccase activity ≥5000 U / g.

[0011] Further, the composite microbial agent in step 3) is at least one of a liquid agent and a solid agent; preferably a liquid composite microbial agent, which has a fast dispersion speed, high start-up efficiency, and more stable degradation effect, and the composite microbial agent is composed of Rhodococcus spp., Pseudomonas spp., and Acinetobacter spp. microorganisms in a mass ratio of 5:3:2, with an effective viable count ≥1×10⁻⁶. 9 CFU / mL; where: The Rhodococcus microorganisms mentioned are at least one of Rhodococcus rubrum and Rhodococcus Gordonii; The Pseudomonas microorganisms mentioned are at least one of Pseudomonas putida and Pseudomonas fluorescens. The Acinetobacter genus microorganisms mentioned are at least one of Acinetobacter calcium acetate and Acinetobacter lophiae.

[0012] Furthermore, the filtration in step (4) is performed using a 150-mesh vibrating screen.

[0013] Furthermore, the product obtained after treatment has a capsaicin degradation rate of ≥70%, a COD removal rate of ≥65%, and an ammonia nitrogen removal rate of ≥80%. The product is non-toxic and non-irritating and can be used directly in agriculture.

[0014] The beneficial effects of this invention are as follows: 1. This invention is specifically designed for the treatment of capsaicin waste liquid, and can solve practical pain points in the industry.

[0015] 2. The core objective of this invention is to treat capsaicin waste liquid, with pig manure water serving only as an auxiliary substrate, which is significantly different from existing pig manure water treatment methods.

[0016] 3. This invention can complete the treatment in just 45-50 hours under normal temperature conditions, with fast treatment speed and stable effect.

[0017] 4. The combination of three bacteria—Rhodococcus, Pseudomonas, and Acinetobacter—along with potassium humate and compound biological enzymes, results in a degradation efficiency significantly higher than that of a single bacterial agent or pig manure-free water, demonstrating remarkable technical effectiveness.

[0018] 5. The process is simple, requires no heating or cooling, has low energy consumption, and is easy to operate, making it suitable for large-scale industrial implementation.

[0019] 6. The treated liquid can be directly used to formulate organic water-soluble fertilizers or soil amendment substrates, realizing the synergistic resource utilization of industrial waste liquid and aquaculture wastewater, which has both environmental and economic benefits. Detailed Implementation Example 1

[0020] A method for treating capsaicin waste liquid with pig manure and a compound microbial agent to produce fertilizer includes the following steps: 1) Mix capsaicin waste liquid and pig manure water evenly according to the following mass percentages: capsaicin waste liquid: 40%, pig manure water: 60%, and adjust the pH value of the mixture to 7.5 with sodium carbonate to obtain the mixture; 2) In the mixture of step 1), add potassium humate source of molasses at a rate of 1.5 kg / ton of mixture, and then add a compound biological enzyme composed of cellulase and laccase in a mass ratio of 2:1 at a rate of 0.5 kg / ton of mixture, wherein: cellulase activity ≥10000 U / g, laccase activity ≥5000 U / g, stir and activate for 35 minutes to obtain activated mixture; 3) In the activation mixture of step 2), add a compound microbial agent at a rate of 1 kg / ton of mixture. The compound microbial agent is as follows: Rhodococcus rubrum: Pseudomonas putida: Acinetobacter calcareosa = 5:3:2, with an effective viable count ≥ 1 × 10⁻⁶. 9 CFU / mL; Under the conditions of 25℃ temperature and dissolved oxygen 3 mg / L, the aeration reaction was carried out for 48 hours to obtain a treatment liquid with a capsaicin degradation rate of 75%, a COD removal rate of 68%, an ammonia nitrogen removal rate of 82%, and a harmless and stable state. 4) The treatment liquid from step 3) can be directly used to prepare organic water-soluble fertilizer in accordance with conventional methods. That is, the treatment liquid can be filtered through a 150-mesh vibrating screen and then used as organic water-soluble fertilizer. Example 2

[0021] A method for treating capsaicin waste liquid with pig manure and a compound microbial agent to produce fertilizer includes the following steps: 1) Mix capsaicin waste liquid and pig manure water evenly according to the following mass percentages: capsaicin waste liquid: 60%, pig manure water: 40%, and adjust the pH of the mixture to 7.2 with potassium carbonate to obtain the mixture; 2) In the mixture of step 1), add molasses-derived potassium humate at a rate of 2 kg / ton of mixture, and then add a compound biological enzyme composed of cellulase and laccase in a mass ratio of 2:1 at a rate of 0.5 kg / ton of mixture, wherein: cellulase activity ≥10000 U / g, laccase activity ≥5000 U / g, stir and activate for 35 minutes to obtain activated mixture; 3) In the activation mixture of step 2), add a compound microbial agent at a rate of 1 kg / ton of mixture. The compound microbial agent is as follows: Rhodococcus Gordonii : Pseudomonas fluorescens : Acinetobacter lophiae = 5:3:2, with an effective viable count ≥ 1 × 10⁻⁶. 9 CFU / mL; Under the conditions of 28℃ temperature and dissolved oxygen 2.5 mg / L, the aeration reaction was carried out for 46 hours to obtain a treatment liquid with a capsaicin degradation rate of 71%, a COD removal rate of 65%, an ammonia nitrogen removal rate of 80%, and a harmless and stable state. 4) The treatment liquid from step 3) can be directly used to prepare soil amendment substrates as usual. That is, the treatment liquid can be filtered through a 150-mesh vibrating screen and then used as an organic water-soluble fertilizer. Example 3

[0022] A method for treating capsaicin waste liquid with pig manure and a compound microbial agent to produce fertilizer includes the following steps: 1) Mix capsaicin waste liquid and pig manure water evenly according to the following mass percentages: capsaicin waste liquid: 30%, pig manure water: 70%, and adjust the pH of the mixture to 7.4 with potassium hydroxide to obtain the mixture; 2) In the mixture of step 1), add molasses-derived potassium humate at a rate of 1 kg / ton of mixture, and then add a compound biological enzyme composed of cellulase and laccase in a mass ratio of 2:1 at a rate of 0.5 kg / ton of mixture, wherein: cellulase activity ≥10000 U / g, laccase activity ≥5000 U / g, stir and activate for 35 minutes to obtain activated mixture; 3) In the activation mixture of step 2), add a compound microbial agent at a rate of 1 kg / ton of mixture. The specific compound microbial agent is as follows: Rhodococcus rubrum: Pseudomonas fluorescens: Acinetobacter calcareosa = 5:3:2, with an effective viable count ≥ 1 × 10⁻⁶. 9 CFU / mL; Under the conditions of 30℃ temperature and dissolved oxygen 4 mg / L, the aeration reaction was carried out for 49 hours to obtain a treatment liquid with a capsaicin degradation rate of 73%, a COD removal rate of 67%, an ammonia nitrogen removal rate of 83%, and a harmless and stable state. 4) The treatment liquid from step 3) can be directly used to prepare organic water-soluble fertilizer in accordance with conventional methods. That is, the treatment liquid can be filtered through a 150-mesh vibrating screen and then used as organic water-soluble fertilizer.

[0023] Comparative Example 1 Comparative Example 1 is a control example without the addition of pig manure water. The steps are as follows: 1) Adjust the pH of the capsaicin waste liquid to 7.5; 2) Add molasses-derived potassium humate at a rate of 1 kg / ton of mixed solution, and then add a compound biological enzyme composed of cellulase and laccase in a mass ratio of 2:1 at a rate of 0.5 kg / ton of mixed solution, wherein: cellulase activity ≥10000 U / g, laccase activity ≥5000 U / g, and stir to activate for 35 minutes. 3) Add compound microbial agent at a rate of 1 kg / ton of mixed solution. The specific compound microbial agent is as follows: Rhodococcus rubrum: Pseudomonas putida: Acinetobacter calcareosa = 5:3:2, with an effective viable count ≥ 1 × 10⁻⁶. 9 CFU / mL; Under conditions of 30℃ and dissolved oxygen of 3 mg / L, the aeration reaction was carried out for 48 hours to obtain a treatment solution with a capsaicin degradation rate of 45%, a COD removal rate of 42%, and an ammonia nitrogen removal rate of 50%.

[0024] Conclusion: Pig manure water is an essential key technical feature for achieving efficient degradation in this invention.

[0025] Comparative Example 2 Comparative Example 2 is a single-inoculum control example, and the steps are as follows: 1) Mix capsaicin waste liquid and pig manure water evenly according to the following mass percentages: capsaicin waste liquid: 40%, pig manure water: 60%, and adjust the pH of the mixture to 7.5 with sodium hydroxide to obtain the mixture; 2) In the mixture of step 1), add potassium humate at a rate of 1.5 kg / ton of mixture, and then add a compound biological enzyme composed of cellulase and laccase in a mass ratio of 2:1 at a rate of 0.5 kg / ton of mixture, wherein: cellulase activity ≥10000 U / g, laccase activity ≥5000 U / g, stir and activate for 35 minutes to obtain activated mixture; 3) In the activation mixture of step 2), add Rhodococcus erythropoietin inoculant at a rate of 1 kg / ton of mixture to replace the compound inoculant, with an effective viable count ≥ 1 × 10⁻⁶. 9 CFU / mL; Under conditions of 25℃ and dissolved oxygen of 3 mg / L, the aeration reaction was carried out for 48 hours to obtain a treatment solution with a capsaicin degradation rate of 42%, a COD removal rate of 48%, and an ammonia nitrogen removal rate of 55%.

[0026] Conclusion: The combination of Rhodococcus, Pseudomonas, and Acinetobacter species has a significant synergistic effect.

Claims

1. A method for treating capsaicin wastewater to produce fertilizer using pig manure and a compound microbial agent, applicable to treating capsaicin crystallization refining wastewater with high salt content, high toxicity, high viscosity, and high COD, characterized in that... Includes the following steps: (1) Mix capsaicin crystallization refining waste liquid and pig manure water in the following mass percentages: 30-60% capsaicin crystallization refining waste liquid and 40-70% pig manure water. Adjust the pH of the mixture to 6.0-9.0 with an acid-base regulator to obtain the mixture. (2) Add potassium humate to the mixture obtained in step (1) at a rate of ≥0.5 kg / ton of mixture, and then add compound biological enzyme at a rate of 0.5 kg / ton of mixture. Stir and activate for 30–40 minutes to obtain activated mixture. (3) Add compound microbial agent to the activated mixture obtained in step (2) at a rate of ≥0.5 kg / ton of mixture, and aerate for 45–50 hours under the conditions of 20–30℃ and dissolved oxygen 2–4 mg / L to obtain a harmless treatment liquid. (4) After filtering the harmless treatment liquid obtained in step (3), it is directly prepared as organic water-soluble fertilizer or soil improvement substrate.

2. The method according to claim 1, characterized in that, The acid-base regulator mentioned in step (1) is one of potassium carbonate, potassium bicarbonate, sodium carbonate, sodium bicarbonate, potassium hydroxide, and sodium hydroxide.

3. The method according to claim 1, characterized in that, The potassium humate mentioned in step (2) is either molasses-derived potassium humate or mineral-derived potassium humate.

4. The method according to claim 1, characterized in that, The compound biological enzyme mentioned in step (2) is a mixture of cellulase and laccase in a mass ratio of 2:1, with cellulase activity ≥10000 U / g and laccase activity ≥5000 U / g.

5. The method according to claim 1, characterized in that, The compound microbial agent of the step (3) is compounded by Rhodococcus, Pseudomonas and Acinetobacter in a mass ratio of 5:3:2, and the effective viable cell number is ≥1×10 9 CFU / mL.

6. The method according to claim 5, characterized in that, The Rhodococcus genus microorganism is at least one of Rhodococcus rubrum and Rhodococcus Gordonii; the Pseudomonas genus microorganism is at least one of Pseudomonas putida and Pseudomonas fluorescens; the Acinetobacter genus microorganism is at least one of Acinetobacter calcium acetate and Acinetobacter loffieri.

7. The method according to claim 1, characterized in that, The filtration in step (4) uses a 150-mesh vibrating screen.

8. The method according to claim 1, characterized in that, The product obtained after treatment has a capsaicin degradation rate of ≥70%, a COD removal rate of ≥65%, and an ammonia nitrogen removal rate of ≥80%. The product is non-toxic and non-irritating and can be used directly in agriculture.