Method of preparing organic fertilizer through mixed fermentation of biogas residues and biogas slurry in biogas engineering

Abstract

The invention discloses a method of preparing an organic fertilizer through mixed fermentation of biogas residues and biogas slurry in biogas engineering. The method comprises: A, preparing external compost environment, wherein inside of the greenhouse is sealed, and artificial turning is carried out to ventilate and supply oxygen; B, using residual biogas wastes and straws as raw materials of the compost, and chopping the straws, wherein the residual biogas wastes are pig manure and sludge mixture left in the biogas; C, detecting a water content of the biogas residues and the straws, uniformly mixing and stirring the biogas residues and the straws, composting the mixture in the greenhouse, laying plastic foils on the ground, and uniformly laying the mixture on the plastic foil as a bottom compost; D, adding water to regulate a water content of the compost mixture according to the water content of the biogas residues and the straws; E, performing artificial turning after a temperature of the compost rises; F, fermenting until the compost has a dark brown appearance and is loose in structure; and G, performing post-treating, comprising air-drying the mature compost, crushing and packaging. The method is simple, convenient, practical, low in cost, good in promotion effect for output and quality of crops, and quite high in development and utilization values.

Description

technical field [0001] The invention relates to the fields of environmental protection and organic fertilizer production, and more specifically relates to a production method for post-treatment of biogas residue and biogas slurry in large and medium-sized biogas projects, which is suitable for the mixed fermentation of straw and biogas residue and biogas slurry to prepare organic fertilizer. Background technique [0002] With the intensive development of livestock and poultry farms, a large amount of livestock and poultry manure is discharged in a concentrated manner, which is extremely harmful to the environment, and effective measures must be taken to deal with it. At present, the government is actively promoting large and medium-sized biogas projects, but the solid-liquid mixture produced after the fermentation of pig feces and urine waste remains in the pool in the form of colloid, and the COD concentration is very high, making it difficult to achieve solid-liquid separat...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of subsequent treatment of residual biogas residues in large and medium-sized biogas projects, and to provide a method for preparing organic fertilizer by adding rice straw to biogas residues and composting

Just by adding chopped rice straw, it can solve the problem that the residual biogas residue in the biogas digester has a large water content and is difficult to separate solids and liquids, and at the same time it can turn waste into treasure and make organic fertilizer

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