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Impact of applied current on sulfate-rich wastewater treatment and microbial biodiversity in the cathode chamber of microbial electrolysis cell (MEC) reactor
Wang, Kai1,2,3; Sheng, Yuxing2,3; Cao, Hongbin2,3; Yan, Keping1; Zhang, Yi1,2,3
2017
发表期刊CHEMICAL ENGINEERING JOURNAL
ISSN1385-8947
卷号307期号:JAN页码:150-158
摘要

Microbial electrolysis cell (MEC) coupled with sulfate-reducing bacteria (SRB) was used to degrade sulfate-rich wastewater which was deficient in electron donors. Results confirmed that SRB could trigger vigorous synergy with an applied current. An applied electrical field of 1.5 mA (R1) resulted in the highest sulfate removal, which was 14.9% higher than that of the control reactor (R0). In addition, organic substance consumption decreased with the increase of applied current. The concentration of lactic dehydrogenase (LDH), an indicator of cell rupture, increased by 3.59 times at 2.5 mA; that of ATP, an indicator of cell metabolism, sharply decreased under 2.5 and 3.5 mA. This finding indicated that high current led to plasmatorrhexis, low growth rate, and metabolic activity, subsequently reduced sulfate-reduction efficiency. Conversely, a proper current resulted in the enhancement of extracellular secretion, which was conducive to biofilm formation as further confirmed by detection through SEM. Electrochemical impedance spectroscopy (EIS) illustrated the SRB in the biofilm could accelerate the rate of direct electron transfer to cathode. Genus-level results further revealed that the dominant bacterium Desulfovibrio, an SRB, was richer in the cathode biofilm and RI, compared with RO. (C) 2016 Elsevier B.V. All rights reserved.

关键词Microbial Electrolysis Cells (Mecs) Sulfate-reducing Bacteria (Srb) Optimal Current Applied Microbial Activity Charge Transfer Resistance Microbial Community
文章类型Article
WOS标题词Science & Technology ; Technology
DOI10.1016/j.cej.2016.07.106
收录类别SCI
语种英语
关键词[WOS]DIRECT ELECTRIC-CURRENT ; ACTIVATED-SLUDGE ; REDUCTION ; REMOVAL ; MICROORGANISMS ; STIMULATION ; METABOLISM ; BIOFILMS ; ENERGY ; RECOVERY
WOS研究方向Engineering
WOS类目Engineering, Environmental ; Engineering, Chemical
项目资助者National Natural Science Foundation of China(20877075) ; National Key Laboratory of Biochemical Engineering ; National Key Technologies RD Program(2006BAC02A05) ; National Basic Research Program of China (973 Program)(2007CB613501) ; Brook Byers Institute at George Tech
WOS记录号WOS:000387298200017
引用统计
被引频次:17[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ipe.ac.cn/handle/122111/21649
专题生化工程国家重点实验室
作者单位1.Zhejiang Univ, Coll Chem & Biol Engn, Ind Ecol & Environm Res Inst, Hangzhou 310058, Zhejiang, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, Natl Key Lab Biochem Engn, Beijing 100190, Peoples R China
3.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
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GB/T 7714
Wang, Kai,Sheng, Yuxing,Cao, Hongbin,et al. Impact of applied current on sulfate-rich wastewater treatment and microbial biodiversity in the cathode chamber of microbial electrolysis cell (MEC) reactor[J]. CHEMICAL ENGINEERING JOURNAL,2017,307(JAN):150-158.
APA Wang, Kai,Sheng, Yuxing,Cao, Hongbin,Yan, Keping,&Zhang, Yi.(2017).Impact of applied current on sulfate-rich wastewater treatment and microbial biodiversity in the cathode chamber of microbial electrolysis cell (MEC) reactor.CHEMICAL ENGINEERING JOURNAL,307(JAN),150-158.
MLA Wang, Kai,et al."Impact of applied current on sulfate-rich wastewater treatment and microbial biodiversity in the cathode chamber of microbial electrolysis cell (MEC) reactor".CHEMICAL ENGINEERING JOURNAL 307.JAN(2017):150-158.
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