文献类型：期刊文献

英文题名：Insights into interactions between vanadium (V) bio-reduction and pentachlorophenol dechlorination in synthetic groundwater

作者：Zhang, Baogang[1];Cheng, Yutong[1];Shi, Jiaxin[1];Xing, Xuan[2];Zhu, Yuling[3];Xu, Nan[4];Xia, Jianxin[2];Borthwick, Alistair G. L.[5]

机构：[1]China Univ Geosci Beijing, MOE Key Lab Groundwater Circulat & Environm Evolu, Sch Water Resources & Environm, Beijing 100083, Peoples R China;[2]Minzu Univ China, Coll Life & Environm Sci, Beijing 100081, Peoples R China;[3]Shaoxing Univ, Coll Chem & Chem Engn, Coll Life Sci, Shaoxing 312000, Zhejiang, Peoples R China;[4]Peking Univ, Shenzhen Grad Sch, Sch Environm & Energy, Shenzhen 518055, Peoples R China;[5]Univ Edinburgh, Sch Engn, Kings Bldg, Edinburgh EH9 3JL, Midlothian, Scotland

年份：2019

卷号：375

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：SCI-EXPANDED(收录号：WOS:000483341000018)、、EI(收录号：20192507068164)、Scopus(收录号：2-s2.0-85067313319)、WOS

基金：This research work was supported by Beijing Natural Science Foundation (No. 8192040) and Beijing Nova Program (No. Z171100001117082).

语种：英文

外文关键词：Vanadium (V); Pentachlorophenol; Microbial reduction; Groundwater

外文摘要：Aquifer co-contamination by vanadium (V) and pentachlorophenol (PCP) involves complicated biogeochemical processes that remain poorly understood, particularly from the perspective of microbial metabolism. Batch experiment results demonstrated that V(V) and PCP could be competitively bio-reduced, with 96.0 +/- 1.8% of V (V) and 43.4 +/- 4.6% of PCP removed during 7 d operation. V(V) was bio-transformed to vanadium (IV), which could precipitate naturally under circumneutral conditions, facilitating the removal of up to 78.2 +/- 3.1% dissolved total V. The PCP reductive dechlorination products were mainly 2,4,6-trichlorophenol and 4-mono-chlorophenol with lower toxicity. High-throughput 16S rRNA gene sequencing indicated that Pseudomonas, Soehngenia, and Anaerolinea might be responsible for the two bio-transformations, with detected functional genes of nirS and cprA. Extracellular reduction by cytochrome c and intracellular conversion by nicotinamide adenine dinucleotide (NADH) occurred for both V(V) and PCP. Extracellular proteins in microbial-secreted extracellular polymeric substances (EPS) might also be involved in these enzymatic bioprocesses. EPS could protect microbial cells through V(V) binding by the chemically reactive carboxyl (COO-), and hydroxyl (-OH) groups. These findings elucidate the metabolic processes during anaerobic V(V) and PCP biotransformation, advance understanding of their biogeochemical fates, and provide a foundation on which to develop novel strategies for remediation of co-contaminated aquifers.