Biodegradation of perchloroethylene and chlorophenol co-contamination and toxic effect on activated sludge performance

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• 作者：Hui Li^a ; ¹ ; Ting-Ting Shen^a ; ¹ ; Xiao-Li Wang^b ; Kuang-Fei Lin^a ; ^{kflin@ecust.edu.cn} ; Yong-Di Liu^a ; ^{ydliu@ecust.edu.cn} ; Shu-Guang Lu^a ; Ji-Dong Gu^c ; Ping Wang^b ; ^{pwang11@ecust.edu.cn} ; Qiang Lu^a ; Xiao-Ming Du^d
• 关键词：Co-contamination ; Activated sludge ; Enzyme activity ; Microbial community diversity
• 刊名：Bioresource Technology
• 出版年：2013
• 出版时间：June, 2013
• 年：2013
• 卷：137
• 期：Complete
• 页码：286-293
• 全文大小：1305 K

文摘

This study investigated the effects of PCE and 2-CP co-contamination on growth of microbial community in terms of enzymatic activity and microbial diversity in activated sludge. Results showed that the activities of three key enzymes (dehydrogenase, phosphatase and urease) decreased significantly when PCE (in the range of 5-150 mg/L) was mixed with 2-CP (in the range of 25-150 mg/L). Especially, activity of dehydrogenase decreased by more than 93 % as the concentration of PCE and 2-CP both reached 150 mg/L. PCR-DGGE revealed that short-term exposure with PCE and 2-CP did not lead to shift in the microbial community structure, while clone library demonstrated a significant change in the microbial diversity after long-term exposure. As the population of Alphaproteobacteria and Gamaproteobacteria decreased, with Actinobacteria eventually disappeared, species including Firmicutes, Bacteroidetes and Synergistetes became dominating groups. This study demonstrated that co-contamination with PCE and 2-CP affected the performance of activated sludge in a significant way.