文献类型：期刊文献

英文题名：Re-activation of aged-ZVI by iron-reducing bacterium Shewanella putrefaciens for enhanced reductive dechlorination of trichloroethylene

作者：Yang, Zhilong[1];Wang, Xiao-li[1,2];Li, Hui[1];Yang, Jie[3];Zhou, Li-Yang[1];Liu, Yong-di[1]

机构：[1]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asse, Shanghai, Peoples R China;[2]East China Univ Sci & Technol, State Key Lab Bioreactor Engn, Shanghai, Peoples R China;[3]Shanghai Acad Environm Sci, Res Inst Wastes & Soil Remediat, Shanghai, Peoples R China

年份：2017

卷号：92

期号：10

起止页码：2642

外文期刊名：JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY

收录：;EI(收录号：20171703602173);WOS:【SCI-EXPANDED(收录号:WOS:000408910000016)】；

基金：This work was supported jointly by the National Natural Science Foundation of China (41273109, 51378208, and 51578240), the National key research and development plan (2016YFC0206200), the Program for New Century Excellent Talents in University (NCET-13-0797), the Fok Ying Tung Education Foundation (141077), the Innovation Program of the Shanghai Municipal Education Commission (14ZZ059) and the Innovation Program of the Shanghai Municipal Science and Technology Commission (15DZ1205804), Fundamental Research Funds for the Central Universities (WB1313008, WB1516015, WB1616012). We also would like to thank the anonymous referees for their helpful comments on this paper.

语种：英文

外文关键词：millimetric-scale zero valent iron (mmZVI); nano-scale zero valent iron (nZVI); trichloroethylene (TCE); dissimilatory iron reducing bacteria (DIRB)

摘要：BACKGROUNDZero valent iron (ZVI) has been extensively applied in the remediation of groundwater and wastewater contamination. This study aimed to investigate the depassivation effect of iron-reducing bacterium Shewanella putrefaciens on aged ZVI towards the dechlorination of trichloroethylene in aqueous solutions. RESULTSBoth mmZVI and nZVI showed high reactivity towards TCE until they were passivated. Lepidocrocite was identified as the main corrosion product of nZVI, while green rust was identified as the main corrosion product of mmZVI. More importantly, the combination of iron-reducing bacteria with aged mmZVI generated greater enhancement of TCE removal than the combination with nZVI. Better bacterium-mineral association conditions determined by SEM and the release of ZVI in the core of aged mmZVI counted for the depassivation effect of iron-reducing bacterium on aged mmZVI. Moreover, dialysis bag experiments indicated that Shewanella putrefaciens could employ both indirect and direct mechanisms of electron transfer to iron oxide, and the addition of metal chelating agent promoted the iron reducing process greatly. Synergistic mechanisms between dissimilatory iron reducing bacteria (DIRB) and aged ZVI was proposed. CONCLUSIONThis study demonstrated that the contaminants reduction ability of aged ZVI could be recovered to some extent by DIRB and DIRB influenced the long-term performance of ZVI. (c) 2017 Society of Chemical Industry