Preparation method and application of liquor-making wastewater liquid organic fertilizer for sorghum

Abstract

The invention discloses a preparation method of a liquor-making wastewater liquid organic fertilizer for sorghum, which comprises the following steps: S1, concentrating liquor-making wastewater to obtain a concentrated solution; s2, adjusting the pH value of the concentrated solution to 6-7; s3, adjusting the concentrated solution obtained in the step S2 to enable the nutrient content of a single element to be greater than or equal to 20g / L to obtain the wine brewing wastewater liquid organic fertilizer. The wine brewing wastewater organic liquid fertilizer prepared by the method is applied to sorghum and can improve the plant height, chlorophyll synthesis and biomass accumulation in the seedling stage of the sorghum and increase the yield of the sorghum; meanwhile, resource utilization of the wine brewing wastewater is realized.

Description

Technical Field

[0001] This invention relates to the field of organic fertilizer technology, specifically to a method for preparing liquid organic fertilizer from sorghum brewing wastewater and its application. Background Technology

[0002] In agricultural production, the long-term and excessive application of chemical fertilizers is one of the core issues restricting the green development of agriculture. Although chemical fertilizers can increase crop yields in the short term, they damage the soil's micro-ecological structure, leading to a gradual decline in soil organic matter content, soil compaction, and the accumulation of heavy metals. This not only reduces soil fertility but also pollutes surrounding water bodies and the atmosphere through crop absorption and soil leaching, ultimately affecting the quality of agricultural products and ecological environmental safety. Against this backdrop, organic fertilizers, as the core carrier for reducing and replacing chemical fertilizers, have become a key direction for the development of green agriculture. They can replenish soil organic matter and provide slow-release nutrients for crops, meeting the needs of sustainable agricultural development.

[0003] The brewing industry is an important branch of agricultural product processing in my country, but the brewing wastewater generated during its production process has become one of the main sources of agricultural non-point source pollution. Brewing wastewater is characterized by large volume, high content of organic matter and nutrients (nitrogen, phosphorus, potassium, etc.), and complex composition. Direct discharge will cause environmental problems such as eutrophication of water bodies and soil salinization. Traditional brewing wastewater treatment processes generally suffer from high energy consumption, high operation and maintenance costs, and easy generation of secondary pollution. At present, the treatment of brewing wastewater in my country is mainly based on direct discharge after meeting the discharge standards, with extremely low resource utilization rate. This not only wastes the rich nutrient resources in the wastewater, but also increases the cost of environmental protection.

[0004] Current technologies lack solutions for adapting organic fertilizers to brewing wastewater, failing to adjust the nutrient content and ratio of the wastewater according to the specific nutrient requirements of sorghum growth. This results in the inability to fully utilize the fertilizer effect even after simple wastewater treatment, making it difficult to significantly improve sorghum yield and quality. Therefore, it is necessary to develop a method for preparing organic liquid fertilizer that can efficiently treat brewing wastewater, achieve resource utilization, and is tailored to the growth needs of sorghum. Summary of the Invention

[0005] The present invention aims to provide a method for preparing liquid organic fertilizer from brewing wastewater for sorghum and its application, which contains rich organic matter and nutrients and can provide effective nutrient supply for sorghum growth.

[0006] To achieve the above objectives, this application provides the following technical solution: A method for preparing liquid organic fertilizer from brewing wastewater of sorghum includes the following steps: S1, concentrating the brewing wastewater to obtain a concentrated solution; S2, adjusting the pH of the concentrated solution to 6-7; S3, adjusting the concentrated solution obtained in S2 to make the content of a single element nutrient ≥20g / L to obtain the liquid organic fertilizer from brewing wastewater.

[0007] In some embodiments, the brewing wastewater in step S1 is waste liquid generated in the brewing workshop.

[0008] In some embodiments, the concentrate is prepared from brewing wastewater through distillation and extraction.

[0009] In some embodiments, step S2 involves adding an alkaline substance to adjust the pH.

[0010] As a preferred embodiment, the single element includes nitrogen, phosphorus, and potassium.

[0011] In some embodiments, step S2 adjusts the content of a single element nutrient by adding a substance containing nitrogen, phosphorus, and potassium, wherein the substance containing nitrogen, phosphorus, and potassium is selected from at least one of urea, potassium dihydrogen phosphate, and potassium chloride.

[0012] The second technical solution of the present invention: a liquid organic fertilizer for brewing wastewater prepared according to the above preparation method.

[0013] The third technical solution of the present invention: the application of the above-mentioned brewing wastewater liquid organic fertilizer in sorghum planting.

[0014] Furthermore, the liquid organic fertilizer from the brewing wastewater was diluted 500 times and applied to sorghum.

[0015] Working principle and beneficial effects of the present invention: (1) This invention provides a method for recycling brewing wastewater, which effectively treats brewing wastewater and realizes the resource utilization of brewing wastewater.

[0016] (2) The brewing wastewater liquid organic fertilizer of the present invention contains rich organic matter and nutrients, which can provide effective nutrient supply for sorghum growth. Detailed Implementation

[0017] The following detailed description illustrates the specific implementation method: Example 1: Sodium hydroxide was added to the concentrated brewing wastewater to adjust its pH value to 6. Urea, potassium chloride, and potassium dihydrogen phosphate were added to adjust the content of a single nutrient to ≥20g / L, thus obtaining brewing wastewater liquid organic fertilizer.

[0018] Application Example: Five treatment groups were set up: CK, T1, T2, T3, and T4, with five replicates for each group. Sorghum seedlings were raised using floating nutrient solutions. CK used water as the nutrient solution, T1 used concentrated brewing wastewater, T2 used concentrated brewing wastewater at pH 6, T3 used brewing wastewater with a single nutrient content ≥20 g / L, and T4 used brewing wastewater liquid organic fertilizer. After 21 days of seedling cultivation, the seedling characteristics of the sorghum were measured, and the results are shown in the table below.

[0019] As can be seen from the table above, the liquid organic fertilizer prepared from brewing wastewater by this invention can significantly increase the plant height, leaf area, number of leaves, fresh weight, and dry weight of sorghum, while reducing root length.

[0020] It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this invention. These modifications and improvements should also be considered within the scope of protection of this invention, and will not affect the effectiveness of the invention or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A method for preparing liquid organic fertilizer from sorghum brewing wastewater, characterized in that, Includes the following steps: S1. Concentrate the brewing wastewater to obtain concentrated liquid; S2. Adjust the pH of the concentrate to 6-7; S3. Adjust the concentrated liquid obtained from S2 to make the content of single element nutrients ≥20g / L to obtain brewing wastewater liquid organic fertilizer.

2. The preparation method according to claim 1, characterized in that, The brewing wastewater in step S1 is the waste liquid generated in the brewing workshop.

3. The preparation method according to claim 2, characterized in that, The concentrated liquid is prepared from brewing wastewater through distillation and extraction.

4. The preparation method according to claim 3, characterized in that, In step S2, an alkaline substance is added to adjust the pH.

5. The preparation method according to claim 4, characterized in that, The single element includes nitrogen, phosphorus, and potassium.

6. The preparation method according to claim 5, characterized in that, Step S2 adjusts the content of single-element nutrients by adding substances containing nitrogen, phosphorus, and potassium, wherein the substances containing nitrogen, phosphorus, and potassium are selected from at least one of urea, potassium dihydrogen phosphate, and potassium chloride.

7. The brewing wastewater liquid organic fertilizer obtained by any one of the preparation methods according to claims 1 to 6.

8. The application of the brewing wastewater liquid organic fertilizer according to claim 7 in sorghum planting.

9. The application according to claim 8, characterized in that, Dilute the brewing wastewater liquid organic fertilizer 500 times and apply it to sorghum.

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