Biogas slurry purifying method through membrane method

Abstract

The invention discloses a biogas slurry purifying method through a membrane method. A centrifugal separation system, a ceramic membrane filtration system, a nanofiltration membrane desalting system and a reverse osmosis concentration system are involved. The method comprises the following steps of centrifugal separation, wherein original biogas slurry is conveyed to a centrifugal separator from afirst-level original biogas slurry storage tank through a first material conveying pump for solid and liquid separation, separated filter residues can be used as a raw material of feed, and a separated filtrate flows into a second-level original biogas slurry storage tank of the ceramic membrane filtration system; ceramic membrane filtration, wherein the filtrate in the second-level original biogas slurry storage tank is pumped into a tubular ceramic membrane unit through a circulating pump for separation, and remaining suspended solids, colloids, microorganisms, macromolecular organic matterand the like in the biogas slurry are removed. By arranging the centrifugal separation system, the ceramic membrane filtration system, the nanofiltration membrane desalting system and the reverse osmosis concentration system, the problems are solved that a traditional biogas slurry purifying method is single in separation filtration measure and not ideal in purifying effect, and valuable components in the biogas slurry cannot be easily separated out completely.

Description

technical field [0001] The invention relates to the technical field of biogas slurry purification, in particular to a biogas slurry purification method by membrane method. Background technique [0002] In recent years, the livestock and poultry breeding industry and the catering industry have developed rapidly, and the discharge of biogas slurry from farms and food waste fermentation has increased rapidly, causing serious pollution to the natural environment. The biogas slurry after anaerobic fermentation contains a large amount of nitrogen, phosphorus, Potassium, amino acids, vitamins and other trace elements are the main components of liquid waste. If they are directly discharged, they will not only cause environmental pollution, but also waste resources. The existing biogas slurry purification methods are difficult to remove valuable components in the biogas slurry. Separation, large-scale utilization of biogas slurry with the highest value has become an important technic...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the deficiencies of the prior art, the present invention provides a biogas slurry purification method by membrane method, which solves the problem that the traditional biogas slurry purif

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