Biogas slurry deep treatment method and application

Abstract

The invention discloses a biogas slurry deep treatment method. The method comprises the steps that pretreated biogas slurry is used as a raw material, and ultrafiltration, nanofiltration, reverse osmosis and multi-effect evaporation are performed in sequence; the membrane diameters of different membrane filtering systems are different, grade separation of different components in biogas slurry can be achieved, and then biogas slurry concentrated solutions obtained through different filtration ways can form leaf fertilizer of different grades. Meanwhile, the multi-effect evaporation technology and the membrane filtration technology are effectively combined, the disadvantage that the concentration multiple of the membrane separation technology is small is avoided, multi-effect evaporation is performed on the condition of the high temperature relative to the membrane, and biological bacteria in biogas slurry can be killed, so that the storage condition the final product is mild, and the problem that the product goes bad does not need to be considered. The biogas slurry deep treatment method has the advantages that the membrane separation technological process is simple and the fluid flow controllability is high, and further has the advantage that multi-effect evaporation can flexibly control the concentration multiple.

Description

technical field [0001] The invention belongs to the field of biogas slurry treatment, and in particular relates to a biogas slurry deep treatment method. Background technique [0002] Biogas slurry is the residue produced by anaerobic fermentation of organic waste such as human and animal manure and crop straw in a biogas digester. It is a high-quality organic fertilizer. Such as figure 2 As shown, since the biogas slurry not only contains conventional nutrients required by plants such as crops and flowers, such as nitrogen, phosphorus, potassium, magnesium, calcium, etc., but also active organic components, such as humic acid, indole acetic acid, lactic acid bacteria, Plant hormones such as gibberellins and cytokinins, as well as organic molecules such as B vitamins, amino acids, proteolytic enzymes, and certain antibiotics. These components coordinate with each other and exist in the biogas slurry in the form of quick-acting nutrients and biopesticides, which can not onl...

AI Technical Summary

Problems solved by technology

Even after pretreatment to remove most of the harmful components and solid particles in the biogas slurry, the value of nutrients cannot be reflected due to the existence of a large amount of free water in the biogas slurry

In addition, due to the seasonality of plant fertilization, in the season when fertilization is not required, the disorderly discharge of excess biogas slurry causes environmental pollution and waste

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