Biogas residue liquid processing method

Abstract

The invention discloses a biogas residue liquid processing method suitable for large biogas digesters. The method comprises the steps of biogas residue liquid collection, flocculation standing, solid-liquid separation, dehydration and purification. The dehydration rate is improved through flocculation, standing solid-liquid separation, pre-dehydration and dehydration steps, so the utilization values of the biogas residue liquid are improved, and the treatment efficiency of the biogas residue liquid is improved; and additionally, biogas residues and a biogas liquid are not leaked in the whole treatment process, and are recovered respectively, so the utilization rates of the biogas residues and the biogas liquid are improved, and secondary pollution risks are reduced.

Description

technical field [0001] The invention relates to the technical field of biogas preparation, in particular to a method for processing biogas residue liquid, which is especially suitable for the processing method of biogas residue liquid matched with large biogas tanks. Background technique [0002] As is well known, biogas, as a new energy source, is favored by people and is being promoted on a large scale. With the support of the central government's policy guidance and capital investment, the scale of China's biogas industry has shown a trend of increasing year by year, especially the number of household biogas digesters has increased significantly, and has become the main force of the biogas industry. At present, agricultural production is making great strides towards high yield, high quality, and high efficiency. Under this situation, the focus of comprehensive treatment and utilization of manure and water in large-scale farms should not only be the development and utiliza...

AI Technical Summary

Problems solved by technology

If handled properly, the nutrients, rich organic matter and mineral ash contained in the biogas residue will become high-quality organic fertilizers; however, if the large amount of biogas residue discharged from large-scale biogas projects is not handled properly, it will definitely cause secondary pollution and waste of resources

[0003] In the prior art, the treatment of biogas residues is limited to simple solid-liquid separation, which will lead to low dehydration rate, which not only reduces the efficiency of biogas residues as organic fertilizers, but also produces fluffy biogas residues that are easy to clog Dehydration separation equipment

In addition, direct solid-liquid separation of untreated biogas residues also greatly reduces the efficiency of solid-liquid separation equipment, and generally faces the problem of small processing capacity

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