Method of preparing fertilizer from biogas slurry and biogas residues, fertilizer prepared through method and application of fertilizer

Abstract

The invention relates to the field of preparing fertilizers from biogas anaerobic fermentation products, in particular to a method of preparing a fertilizer from biogas slurry and biogas residues, thefertilizer prepared through the method and application of the fertilizer. The method comprises the steps that a biogas anaerobic fermentation product is subjected to solid-liquid separation to obtainthe biogas residues and the biogas slurry; the obtained biogas slurry is concentrated to obtain a concentrated solution; the biogas residues, the concentrated solution and a selectable nutrient conditioner are mixed to obtain a mixture; and the mixture is subjected to aerobic composting, and the composing product and a selectable auxiliary material are compounded to obtain the fertilizer. Throughthe method, high-value utilization of the biogas slurry is effectively realized, the problems in biogas slurry storage and transportation are solved, and the method is less in investment and easy tooperate. More importantly, by use of the fertilizer, not only can the germination rate of seeds be increased, but also the germination time of the seeds is effectively shortened, and the draught resistance and water-logging resistance of crops are remarkably improved.

Description

technical field [0001] The invention relates to the field of using biogas anaerobic fermentation products to prepare fertilizers, in particular to a method for preparing fertilizers from biogas slurry and biogas residues, the fertilizer prepared by the method and the application of the fertilizer. Background technique [0002] Biogas is formed by the action of specific microorganisms under anaerobic conditions from organic waste (such as crop straw, human and animal manure, domestic garbage, organic waste, and sewage, etc.). In the process of anaerobic fermentation, most of the organic matter in the fermentation raw materials is decomposed into various water-soluble substances such as protein and amino acid to form anaerobic fermentation liquid (ie biogas slurry); and the raw materials that cannot be decomposed or incompletely decomposed by microorganisms The material forms a digestate. If these biogas residues and biogas slurry are not properly treated, direct discharge wi...

AI Technical Summary

Problems solved by technology

However, because of the seasonality of farming, especially in the Northeast where only one season of farming is done a year, the factory must be equipped with a large enough biogas tank for storage, resulting in an increase in investment; in addition, when the scale of the project is too large, the amount of biogas generated is far from It exceeds the maximum consumption of the local farmland, thus limiting the production capacity of the device; if it is applied excessively, it will also pollute the water environment

Some enterprises choose to concentrate biogas slurry and develop foliar fertilizer for sale, but the market capacity is small and marketing is difficult