Method for preparing high-efficient organic-inorganic compound fertilizer from biogas slurry

Abstract

The invention discloses a method for preparing a high-efficient organic-inorganic compound fertilizer from biogas slurry. The method comprises the following steps: a) performing solid-liquid separation on a biogas residue liquid obtained from biogas fermentation to respectively obtain a solid and a liquid; b) purifying the liquid by utilizing humic acid as a flocculant; c) removing smelly substances in the liquid by utilizing activated carbon; d) performing high-temperature sterilization on the liquid; e) reducing the temperature of the biogas slurry to room temperature and then adding organic raw materials and inorganic raw materials for mixing; f) adding EDTA (ethylene diamine tetraacetie acid) for performing complexing, and adding polysorbate-80 for stabilizing; and g) uniformly mixing to obtain the organic-inorganic liquid fertilizer. A product base liquid prepared by using the method disclosed by the invention is a fermented product which can be dissolved in water at higher speed and be absorbed by crops easier in comparison with ordinary products, further has the advantages of easiness in storage, easiness in transportation, easiness in application and good effects, and can reduce the labor intensity in the liquid fertilizer application process, reduce the agricultural ecological environmental pollution and reduce the environmental pollution caused by disordered emission of the biogas slurry in a period without fertilizer application.

Description

[0001] technical field [0002] The invention belongs to the field of preparation of liquid organic-inorganic compound fertilizer produced from biogas slurry, and specifically refers to a method for preparing high-efficiency liquid organic-inorganic compound fertilizer by using biogas slurry from livestock and poultry breeding and organic raw materials-inorganic raw materials. Background technique [0003] In recent years, China's animal husbandry industry has grown rapidly and is constantly developing in the direction of intensification, scale and modernization. However, if the livestock and poultry manure is not treated in time, it will endanger the environmental sanitation around the breeding base. In recent years, the country has paid more and more attention to environmental safety. If the pollution problem of the breeding industry is not dealt with, it will also affect its own development. [0004] In the progress of environment and energy development, the comprehensive...

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Problems solved by technology

[0006] The content of these active ingredients in the biogas slurry is relatively low, the concentration is generally about 10%, and it contains plant fibers, sediment, bacteria, clay, colloids, pesticide residues, suspended solids, and organic matter with a fishy smell. Therefore, plants such as crops and flowers directly The application of this kind of biogas slurry does not meet the agricultural health standards and causes secondary pollution of farmland

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