文献类型：期刊文献

英文题名：Bacterial diversity evolution process based on physicochemical characteristics of sludge treating hydroquinone during acclimation

作者：Zhang, Xinyu[1,2];Linghu, Shanshan[1,2];Chen, Zhichong[1,2];Gu, Hao[1,2];Chen, Xiurong[1,2];Wei, Xiao[1,2];Hu, Xueyang[1,2];Yang, Yingying[1,2];Gao, Yuqing[1,2]

机构：[1]East China Univ Sci & Technol, Natl Engn Lab High Concentrat Refractory Organ Wa, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Protect Key Lab Environm Risk Assessment & Contro, Shanghai 200237, Peoples R China

年份：2022

卷号：29

期号：21

起止页码：31686

外文期刊名：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH

收录：;EI(收录号：20242616366711);WOS:【SCI-EXPANDED(收录号:WOS:000740638800012)】；

基金：This research was supported by the National Natural Science Foundation (No. 51878278).

语种：英文

外文关键词：Coal-gasification wastewater; Hydroquinone; Sludge extract; Toxicity removal; Metagenomics; Microbial diversity

摘要：Hydroquinone is one of the main pollutants in coal-gasification wastewater, which is biologically toxic and difficult to remove. The aerobic biodegradation rate, organic toxicity, and microbial community structure at different acclimation stages of degradation of hydroquinone by activated sludge were investigated. In each acclimation cycle, the removal of hydroquinone reached 100% after 5 days, indicating that high-concentration hydroquinone in the activated sludge could be completely biodegraded. When the microbial flora was inhibited by the influent hydroquinone, the enzyme system experienced stress conditions and led to the secretion of secondary metabolites, extracellular protein of 5-10 kDa mainly contributing to the sludge organic toxicity. Microbial diversity analysis showed that with the increase of the concentration of hydroquinone, beta-Proteus bacteria such as Azoarcus and Dechloromonas gradually accumulated, which improved the removal of hydroquinone with aerobic activated sludge in the sequencing batch reactor (SBR) system. As the inhibition degree exceeded the appropriate tolerance range of microorganisms, bacteria would secrete much more secondary metabolites, and the organic toxicity of sludge would reach a relatively high level.