High-value treatment method of biogas slurry and biogas residues

Abstract

The invention relates to a high-value treatment method of a biogas slurry and biogas residues. The method comprises the following steps: after a biogas slurry-biogas residue mixture is subjected to solid-liquid separation, the biogas residues are conveyed to an aerobic composting workshop, and the biogas slurry is conveyed to a precipitation tank; the biogas slurry is subjected to precipitation to be divided into an upper layer, a middle layer and a lower layer, wherein the supernate on the upper layer is used as livestock/poultry house rinsing water or anaerobic fermentation conditioning water, the suspended biogas slurry on the middle layer is conveyed into a biogas slurry storage trench of the aerobic composting workshop and sprayed, as a conditioning liquid, onto the aerobic composting stockpile by a spray system on pile turning equipment, and the sludge on the lower layer and the biogas residues are used as fermentation raw materials for aerobic composting; and the mixture after aerobic composting is further used for producing an organic fertilizer. The method effectively solves the problems of difficulty in consuming the biogas slurry and biogas residues and low added value, and the gradient utilization of the biogas slurry and the improvement of the composting system are performed to combine the treatment and utilization of the biogas slurry and biogas residues, thereby avoiding the environmental pollution, and obtaining the high-value product. Thus, the method has obvious environmental, social and economic benefits.

Description

technical field [0001] The invention relates to the field of agricultural organic waste treatment, in particular to a high-value treatment method for biogas slurry and biogas residue. Background technique [0002] In recent years, my country's rural household biogas and large and medium-sized biogas projects have developed rapidly and achieved remarkable results. While biogas fermentation technology produces biogas, it also produces a large amount of fermentation residues, namely biogas slurry and biogas residue. Biogas slurry and biogas residues contain mineral elements such as N, P, and K required for crop growth, and also contain various physiologically active substances and trace elements. If they can be used reasonably, they can bring certain economic value; If it is used, it will bring secondary pollution to the surrounding environment. Especially in large-scale biogas projects, a large amount of biogas slurry and residues are discharged every day. If they cannot be ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that biogas slurry and biogas residue in current biogas projects are difficult to be effectively and rationally utilized, especially the biogas slurry in large-scale biogas projects is difficult to absorb, etc., by precipitating and layering the biogas slurry to obtain reasonable Cascade utilization, the supernatant is used as conditioning water for biogas engineering or flushing water for livestock and po

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