期刊
CHEMOSPHERE
卷 178, 期 -, 页码 548-555出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2017.03.088
关键词
Antibiotic resistance genes; Antibiotics; Microbial fuel cell; Constructed wetlands
资金
- National Natural Science Foundation of China [41571476]
- National Key Technologies R&D Program of China [2015BAL02801-02]
- Provincial Natural Science Foundation of Jiangsu, China [BK20141117]
- Scientific Research Foundation of Graduate School of Southeast University [YBJJ1647]
Microbial fuel cell-coupled constructed wetlands (CW-MFCs) use electrochemical, biological, and ecological functions to treat wastewater. However, few studies have investigated the risks of antibiotic resistance genes (ARGs) when using such systems to remove antibiotics. Therefore, three CW-MFCs were designed to assess the dynamics of ARGs in filler biofilm and effluent over 5000 h of operation. The experimental results indicated that relatively high steady voltages of 605.8 mV, 613.7 mV, and 541.4 mV were obtained at total influent antibiotic concentrations of 400,1,000, and 1600 mu g L-1, respectively. The 16S rRNA gene level in the cathode layer was higher than those in the anode and two middle layers, but the opposite trend was observed for the sul and tet genes. The relative abundance of the three tested sul genes were in the order sull > sulll > sulill, and those of the five tet genes were in the order tetA > tetC > tetW > tetO > tetQ The levels of sul and tet genes in the media biofilm showed an increase over the treatment period. The effluent water had relatively low abundances of sul and tet genes compared with the filler biofilm. No increases were observed for most ARGs over the treatment period, and no significant correlations were observed between the ARGs and 16S rRNA gene copy numbers, except for sull and tetW in the effluent. However, significant correlations were observed among most of the ARG copy numbers. (C) 2017 Elsevier Ltd. All rights reserved.
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