Method and system for preparing soil conditioner from cow dung

Abstract

The invention provides a method for preparing a soil conditioner from cow dung. The method comprises the steps: separating cow dung from bovine urine, then decomposing cellulose in the cow dung through cellulose decomposition bacteria flora, drying decomposed and fermented cow dung solid residues and performing anaerobic pyrolysis to prepare biomass charcoal; utilizing a general yeast fermenting method to produce ethyl alcohol from a product generated by decomposing and fermenting the cow dung, reducing a content of monosaccharide in reaction liquid and improving kinds of organisms in the reaction liquid; performing hydrothermal reaction on reaction liquid which is generated by fermenting yeast to generate high polymer with a lower biodegradation rate and a quantity of polar groups, evenlymixing a hydrothermal reaction product with a fertilizer and specific high polymer powder, then mixing with biomass charcoal and drying to obtain the soil conditioners. The soil conditioner can gather heavy metal ions and can adjust soil fertility within a certain range. The invention further provides a system for preparing the soil conditioner from the cow dung.

Description

technical field [0001] The invention belongs to the technical field of circular agriculture, and relates to a method and a system for preparing a soil conditioner from cow dung. Background technique [0002] Cattle farms, especially industrialized cattle farms, will produce a large amount of cow dung, which not only contains a large amount of undigested feed, but also naturally ferments to produce methane and sulfur dioxide and other gases. In order to avoid environmental pollution and improve resources Utilization rate, cow dung is generally recycled now. Conventional recycling methods include composting, fermenting marsh to produce liquid fertilizer, and preparing feed. However, the utilization rate of cow dung for composting is relatively low and the cycle is long; the preparation of feed requires high processing requirements for cow dung and produces other wastes. Therefore, the most efficient way to use it is to ferment biogas and prepare liquid fertilizer. However, w...

AI Technical Summary

Problems solved by technology

However, the utilization rate of cow dung for composting is relatively low and the cycle is long; the preparation of feed requires high processing requirements for cow dung and produces other wastes, so the most efficient way to use it is to ferment biogas and prepare liquid fertilizer

However, when fermenting biogas and preparing liquid fertilizer, the utilization rate of biogas sludge is not high. Many treatment systems use biogas sludge directly as fertilizer or compost, and do not make full use of the organic matter in biogas sludge.

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