Method for supplementing denitrifying carbon source by utilizing excess sludge ethanol-type fermentation
A denitrification carbon source and excess sludge technology, applied in biological sludge treatment, pyrolysis treatment sludge, anaerobic digestion treatment, etc., can solve the problems of increased operating costs, toxic and side effects of denitrification system, and insufficient denitrification carbon source To avoid the accumulation of phosphorus in the system and improve the denitrification efficiency
Inactive Publication Date: 2010-11-10
长春联创水质工程有限公司
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The invention discloses a method for supplementing a denitrifying carbon source by utilizing excess sludge ethanol-type fermentation, which aims at the problems of low average level of the biochemical oxygen demand 5 (BOD5) of municipal sewage in China and ubiquitous shortage of the denitrifying carbon source. The method comprises the following steps of: allowing the excess sludge which is subjected to pyrohydrolysis pretreatment to enter a fermentation reactor; cultivating and domesticating ethanol-type zymophyte by using the sludge as a matrix; controlling the fermentation reaction to be atan ethanol-type fermentation stage; refluxing the products to a pyrohydrolysis stage; controlling the pyrohydrolysis temperature to be between 120 and 130 DEG C so that substances with boiling pointslower than 120 DEG C, such as ethanol, acetic acid and the like, exist in the form of gas; and collecting a high-quality organic carbon source which mainly comprises ethanol and acetic acid in a condensation reclaiming mode. The method has the advantages that: the denitrifying carbon source which mainly comprises the ethanol and the acetic acid effectively improves the denitrification efficiency,and the problem of phosphorus accumulation of a system caused by that the sludge after anaerobic digestion is directly used as an additional carbon source is avoided due to a special carbon source extraction mode; and the method also has the advantages of simple control condition of the whole process, easy operation and low operational cost.
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