A novel microbial electrolysis cell (MEC) reactor for biological sulfate-rich wastewater treatment using intermittent supply of electric field
Wang, Kai1,2; Sheng, Yuxing2; Cao, Hongbin2; Yan, Keping1; Zhang, Yi1,2
2017-09-15
发表期刊BIOCHEMICAL ENGINEERING JOURNAL
ISSN1369-703X
卷号125期号:SEP页码:10-17
摘要

Microbial electrolysis cells (MEC), coupled with sulfate-reducing bacteria (SRB), was used to degrade sulfate-rich wastewater that is deficient in electron donors. However, because of the impact of electric double layers (EDLs), salt crystals formed on the electrode, thereby potentially retarding the continuity of sulfate removal during the whole operation. Here, an improved MEC reactor using intermittent electric field was established. It works better in sulfate removal for a longer period, which was higher than the conventional MEC reactor by 2.18-fold after 10 days. Observation on the activity of lactic dehydrogenase (LDH) and ATP revealed that the formation of salt crystals on the electrode led to plasmatorrhexis. Conversely, improved reactor contributed to extracellular substances production and prevented the salt crystal formation, which was conducive to biofilm formation as further verified by detection through SEM. Electrochemical impedance spectroscopy tests showed that the cathodic microorganisms accelerated electron transfer whereas the salt crystals increased the charge transfer resistance. High-throughput sequencing analysis illustrated that improved reactor could maintain the competitiveness of SRB in the microbial community for a longer period. Moreover, the improved reactor resulted in high species diversity, thereby showing the significant resistance of the microorganisms to arduous environments. (C) 2017 Elsevier B.V. All rights reserved.

关键词Microbial Electrolysis Cell Sulfate Reduction Salt Crystals Formation Intermittent Electric Field Microbial Community
文章类型Article
WOS标题词Science & Technology ; Life Sciences & Biomedicine ; Technology
DOI10.1016/j.bej.2017.05.009
收录类别SCI
语种英语
关键词[WOS]AEROBIC GRANULATION ; COMMUNITY SHIFTS ; REMOVAL ; BIODIVERSITY ; PERFORMANCE ; SUBSTANCES ; METABOLISM ; BIOCATHODE ; RESISTANCE ; REDUCTION
WOS研究方向Biotechnology & Applied Microbiology ; Engineering
WOS类目Biotechnology & Applied Microbiology ; Engineering, Chemical
项目资助者National Natural Science Foundation of China(20877075)
WOS记录号WOS:000410017600002
引用统计
文献类型期刊论文
条目标识符http://ir.ipe.ac.cn/handle/122111/23192
专题湿法冶金清洁生产技术国家工程实验室
作者单位1.Zhejiang Univ, Inst Ind Ecol & Environm, Coll Chem & Biol Engn, Hangzhou 310027, Zhejiang, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
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Wang, Kai,Sheng, Yuxing,Cao, Hongbin,et al. A novel microbial electrolysis cell (MEC) reactor for biological sulfate-rich wastewater treatment using intermittent supply of electric field[J]. BIOCHEMICAL ENGINEERING JOURNAL,2017,125(SEP):10-17.
APA Wang, Kai,Sheng, Yuxing,Cao, Hongbin,Yan, Keping,&Zhang, Yi.(2017).A novel microbial electrolysis cell (MEC) reactor for biological sulfate-rich wastewater treatment using intermittent supply of electric field.BIOCHEMICAL ENGINEERING JOURNAL,125(SEP),10-17.
MLA Wang, Kai,et al."A novel microbial electrolysis cell (MEC) reactor for biological sulfate-rich wastewater treatment using intermittent supply of electric field".BIOCHEMICAL ENGINEERING JOURNAL 125.SEP(2017):10-17.
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