Oriented production of acetic acid in sludge anaerobic fermentation by methane-bacterium specific inhibitor

Abstract

The present invention provides a method of directional acetic acid production in anaerobic sludge fermentation using methanogenic bacteria-specific inhibitors which belongs to the sludge recycling field. This invention prepares the methanogenic bacteria-specific inhibitor, 2-bromethylsulfonate sodium into solution of certain concentration and adds the solution into the pretreated sludge. When the concentration of 2-bromethylsulfonate sodium is 5-20 mmol / L and the initial pH is 6-8, the maxmium concentration of acetic acid can achieve 1.84g / L after 15-20 day's fermentation, which is more than five times of the yield of acetic acid under natural conditions. The addition of 2-bromethylsulfonate sodium into anaerobic digestion system will inhibit methanogens and facilitates the accumulation of organic acids, especially acetic acid.

Description

technical field

[0001] The method for directing acetate production in sludge anaerobic fermentation with a specific inhibitor of methanogens involves a specific inhibitor of methanogens—sodium 2-bromoethanesulfonate, which is injected into the anaerobic digestion system Adding this substance can inhibit methanogens and accumulate organic acids, especially acetic acid, which plays an important role in the directional production of acetic acid in anaerobic fermentation of municipal sludge. It belongs to the field of sludge resource utilization. Background technique

[0002] The anaerobic digestion process of sludge can be divided into two stages of acid production and methane production. The research on anaerobic digestion of sludge has mostly focused on how to stabilize sludge to the greatest extent and produce more methane for use as However, due to the large investment in methane purification and storage, many sewage plants fail to make good use of it, resulting in energy ...

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