Characterization of microbial community and resistance gene (CzcA) shifts in up-flow constructed wetlands-microbial fuel cell treating Zn (II) contaminated wastewater
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Lv, Ruiyuan
Rene, Eldon R
Qi, Xiaoyu
Hao, Qiang
Du, Yuanda
Zhao, Congcong
Xu, Fei
Kong, Qiang
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Abstract
The main aim of this work was to characterize the microbial community structure and resistance gene (CzcA) shifts in up-flow constructed wetlands-microbial fuel cell (CW-MFC) treating Zn (II) contaminated wastewater. Two CW-MFC devices were operated, i.e. the experimental group (EG) treating Zn (II) wastewater, and the control group (CG) treating Zn (II)-free wastewater. The results showed the CW-MFC combination exhibited good removal efficiency on Zn (II), while the average voltage, the power density and the removal rates (TP, TN, NH4+-N and COD) significantly reduced (p < 0.05). The microbial community structure showed that the Zn (II) significantly reduced the abundance of some functional genus (p < 0.05), such as Ochrobactrum, Nitrosomonas, Pseudomonas and Dechloromonas. Zn (II) inhibited the microbial richness in the anode, but it played a positive role in the cathode. Anew, the expression of the CzcA in the CW-MFC was promoted by Zn (II), particularly in the cathode.
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Bioresource Technology
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302
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Wastewater treatment processes
Science & Technology
Life Sciences & Biomedicine
Agricultural Engineering
Biotechnology & Applied Microbiology
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Wang, Q; Lv, R; Rene, ER; Qi, X; Hao, Q; Du, Y; Zhao, C; Xu, F; Kong, Q, Characterization of microbial community and resistance gene (CzcA) shifts in up-flow constructed wetlands-microbial fuel cell treating Zn (II) contaminated wastewater, Bioresource Technology, 2020, 302, pp. 122867