生物酶对初沉污泥厌氧发酵产短链脂肪酸的调控研究

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Abstract The objective of this study was to estimate the efficiency of SCFA production from primary sludge using bio- enzyme regulation including alkaline protease, neutral protease and α-amylase. The regulation mechanism was revealed by microbial community and SCFAs component analyses. The three kinds of bio-enzymes could enhance the hydrolysis and acid production during the fermentation of primary sludge. Compared with the blank group, the production and yield of SCFAs achieved 1508 mg COD/L and 0.174 g COD/g VSS on the fourth day of fermentation, respectively, increasing by 1129 mg COD/L and 0.13 g COD/g VSS. Microbial community structure analysis showed that the relative abundance of fermentation-relating bacteria such as Lentimicrobium, Proteiniphilum and Bacteroides were improved, and the growth of methanogenic archaea such as Methanosaeta and Methanosapirillum was inhibited when bio-enzymes were added into the fermentation system. At the same time, the production of acetic acid in the regulated fermentation process was also found to promote.

Key words： bio-enzyme Short-chain fatty acids (SCFAs) primary sludge anaerobic fermentation regulation

Received: 14 September 2021

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X705

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	LIU Guo-hua
	WANG Jian
	QI Lu
	WANG Hong-chen

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LIU Guo-hua,WANG Jian,QI Lu等. Study on regulating anaerobic fermentation for producing short-chain fatty acids from primary sludge in WWTPs by different bio-enzymes[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(5): 2195-2203.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I5/2195

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