脱氯作用
零价铁
环境化学
微观世界
脱卤球绦虫
生物修复
化学
生物刺激
微生物种群生物学
氯
生物强化
微生物联合体
五氯苯酚
环境修复
生物降解
地杆菌
催化作用
微生物降解
微生物
吸附
污染
细菌
氯乙烯
生态学
有机化学
聚合物
生物
遗传学
共聚物
作者
Yan Xu,Yanqiang Tang,Linji Xu,Ying Wang,Zheming Liu,Qingdong Qin
标识
DOI:10.1016/j.scitotenv.2021.148454
摘要
Nano zero-valent iron particles (nZVI, 0.09 wt%), micro zero-valent iron particles (mZVI, 0.09 wt%), granular activated carbon (GAC, 3.03 wt%), GAC supported nZVI (nZVI/GAC, 3.12 wt%) and nZVI&GAC (nZVI 0.09 wt%, GAC 3.03 wt%) were evaluated for their effects on polychlorinated biphenyls (PCBs) anaerobic reductive dechlorination, detoxification, as well as microbial community structure in Taihu Lake (China) sediment microcosms. The results showed that all of these five materials could stimulate PCBs reductive dechlorination, especially for dioxin-like PCB congeners, and nZVI&GAC had the best removal effect on PCBs. The reduction of total PCBs increased from 13.5% to 33.2%. H2 generated by zero-valent iron corrosion was utilized by organohalide-respiring bacteria (OHRB) to enhance the dechlorination of PCBs predominantly via meta chlorine removal in the short term. The addition of ZVI had little impact on the total bacterial abundance and the microbial community structure. The adsorption of GAC and potential bioremediation properties of attached biofilm could promote the long-term removal of PCBs. GAC, nZVI/GAC, nZVI&GAC had different influences on the microbial structure. These findings provide insights into the biostimulation technique for in situ remediations of PCBs contaminated sediments.
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