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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
Source PublicationCHEMICAL ENGINEERING JOURNAL
ISSN1385-8947
Volume307Issue:JANPages:150-158
Abstract

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.

KeywordMicrobial Electrolysis Cells (Mecs) Sulfate-reducing Bacteria (Srb) Optimal Current Applied Microbial Activity Charge Transfer Resistance Microbial Community
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.cej.2016.07.106
Indexed BySCI
Language英语
WOS KeywordDIRECT ELECTRIC-CURRENT ; ACTIVATED-SLUDGE ; REDUCTION ; REMOVAL ; MICROORGANISMS ; STIMULATION ; METABOLISM ; BIOFILMS ; ENERGY ; RECOVERY
WOS Research AreaEngineering
WOS SubjectEngineering, Environmental ; Engineering, Chemical
Funding OrganizationNational 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 IDWOS:000387298200017
Citation statistics
Cited Times:27[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/21649
Collection生化工程国家重点实验室
Affiliation1.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
Recommended Citation
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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