Biogas slurry pretreatment device

Abstract

The invention provides a biogas slurry pretreatment device. The biogas slurry pretreatment device comprises a flocculation deposition part for flocculation deposition of biogas slurry so that heavy metal ions are removed, an air floatation part for air floatation treatment on the biogas slurry subjected to flocculation deposition so that oil stain in the biogas slurry is removed, an ozonization part for treatment on the biogas slurry subjected to air floatation treatment so that organic large molecules are removed. The biogas slurry pretreatment device realizes step-by-step removal of heavy metal ions, floating oil and organic large molecules, which destroy later membrane treatment and biochemical treatment, in the biogas slurry, realizes solid-vapor separation of biogas slurry and is conducive to later deep treatment.

Description

technical field [0001] The invention belongs to the field of biogas slurry treatment, and in particular relates to a biogas slurry pretreatment device. Background technique [0002] Biogas slurry is the biogas residue liquid produced by anaerobic reactor fermentation. The water quality of biogas slurry wastewater has the following characteristics: 1. The content of solid colloid is high, and it is difficult to separate solid and liquid. The fermented biogas slurry contains a large amount of colloidal fine particles, and the colloid contains a large amount of humic acid and other organic compounds, and contains nitrogen, phosphorus, potassium and other substances. It is a good raw material for base fertilizer, and it is very good from theoretical analysis. Raw material of foliar organic fertilizer and enzyme fertilizer. However, in the process of anaerobic biogas water production, a large amount of nitrogen-containing compounds are not completely methanated after being hydro...

AI Technical Summary

Problems solved by technology

However, in the process of anaerobic biogas water production, a large amount of nitrogen-containing compounds are not completely methanated after being hydrolyzed to form nitrogen-containing compounds or amino compounds. These substances have strong positive charges and are compatible with solid The electrical properties of the substances are the same, resulting in resistance and suspension state, which makes it difficult for conventional separation techniques to separate solid / liquid; 2. The biodegradability of biogas slurry is poor

[0003] In the process of biogas preparation, the anaerobic residence time is too long. Under anaerobic conditions, the degradation rate of BOD is much faster than that of COD. Therefore, the biodegradability of biogas slurry is poor, and it is difficult to continue biochemical deal with

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