期刊
WATER RESEARCH
卷 88, 期 -, 页码 257-265出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2015.10.023
关键词
Bioelectrochemical system (BES); Upflow anaerobic sludge blanket (UASB); Reduction; Microbial community analysis; Chloronitrobenzenes (CINBs)
资金
- Major Project of Water Pollution Control and Management Technology of China [2012ZX07101-003-001]
- National Natural Science Foundation of China (NSFC) [51208258, 51378261]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Zijin Intelligent Program of NJUST [2013-ZJ-02-19]
- Natural Science Foundation of China [51222812, 51478446]
Bioelectrochemical system (BES) coupled upflow anaerobic sludge blanket (UASB) was developed for the removal of recalcitrant pollutants but lack of a comprehensive study. Thus in this study an integrated UASB-BES system was operated continuously for 240 d to systematically investigate the feasibility of the enhanced reduction of 2,4-dinitrochlorobenzene (DNCB), with the key operation parameters, the system stability as well as the microbial biodiversity emphasized. The results indicate that high voltage supplied had a positive effect on DNCB reduction but a negative impact for the overhigh voltage (>1.6 V). The ability to resist shock loading was strengthened in the UASB-BES system in comparison with the control UASB system. High-throughput sequencing analysis suggested that the enhanced reduction of DNCB in UASB-BES could be attributed to higher diversity and the enrichment of reduction-related species, potential electroactive species and fermentative species. Both DNCB removal and dechlorination gradually increased with the increase of operation time, indicating the improved performance of the coupled UASB-BES system. The heatmap visualized only slight differences in the microbial community during long-term operation, indicating the stability of the microbial community. The observed efficient and stable performance highlights the potential for long-term operation and full-scale application of the UASB-BES coupled system particularly for highly recalcitrant pollutants removal. (C) 2015 Elsevier Ltd. All rights reserved.
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