Journal
BIORESOURCE TECHNOLOGY
Volume 244, Issue -, Pages 345-352Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.07.143
Keywords
Sulfamethoxazole; Degradation pathway; Bioelectrochemical system; Microbial fuel cell; Methanogenic communities
Funding
- National Natural Science Foundation of China [41571476]
- National Key Technologies R & D Program of China [2015BAL02B01-02]
- National Science and Technology Major Project of China [2017ZX07202004]
- Provincial Natural Science Foundation of Jiangsu, China [BK20141117]
- Scientific Research Foundation of Graduate School of Southeast University, China [YBJJ1647]
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The removal rate and degradation pathway of Sulfamethoxazole (SMX) in bioelectrochemical system (BES) and the elimination dynamics of SMX in a BES driven by stacked constructed wetland-coupled microbial fuel cells (CW-MFCs) were investigated. The results found that SMX (30 mg L-1) was rapidly degraded in the BES, and the SMX removal kinetics was simulated well by a first-order kinetic model (R-2 > 0.93). Low current had no effect on the degradation products but enhanced the SMX removal rate. Biotransformation was the main pathway for the SMX elimination in the BES. The CW-MFCs supplied adequate and stable electricity (0.84-1.01 V) to support the BES for rapid SMX degradation without additional energy inputs. The relative abundance of Methanosarcina (18.7%) and VadinCA11 (3.1%) increased with an increase in voltage up to 1.2 V. However, the opposite was observed for Methanosaeta and Methanomassiliicoccus. The current in the BES influenced the methanogenic communities.
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