CH 4 control and associated microbial process from constructed wetland (CW) by microbial fuel cells (MFC)

• Published in: Journal of environmental management Vol. 260; p. 110071
• Main Authors: Zhang, Ke, Wu, Xiangling, Luo, Hongbing, Li, Xiangkun, Chen, Wei, Chen, Jia, Mo, You, Wang, Wei
• Format: Journal Article
• Language: English
• Published: England 15.04.2020
• Subjects: Bioelectric Energy Sources; Electricity; Electrodes; Waste Water; Wetlands; Constructed wetland (CW); CH control; Plant species; Microbial mechanisms; Microbial fuel cell (MFC)
• ISSN: 1095-8630

Global warming is becoming more severe. We here proposed an innovative green technique aimed at reducing the CH emissions from constructed wetlands (CWs) in which CH is controlled by microbial fuel cells (MFCs). The results of our work indicated that CH emissions from CWs could be controlled by operating MFC. The CH fluxes significantly decreased in the MFC-CW (close circuit CC) compared with the control MFC-CW (open circuit OC). The bioelectricity generation and COD removal rates also differed in the two systems. The highest power density (0.27 W m ) and the lowest CH emissions (4.7 mg m  h ) were observed in the CC system. The plants' effects on the performance of the MFC-CWs were also investigated. The plant species had a profound impact on the CH emissions and electricity production in MFC-CWs. The greatest CH flux (9.5 mg m  h ) was observed from the MFC-CW planted with Typha orientalis, while the CH emissions from the MFC-CW planted with Cyperus alternifolius were reduced by 45%. Additional microbial processes were investigated. Quantitative real-time PCR (q-PCR) analysis indicated that the gene abundance of eubacterial 16 S rRNA, particulate methane monooxygenase (pmoA), and methyl coenzyme M reductase (mcrA) significantly differed for the control CW and MFC-CWs planted with different plants. In the CC systems, the mcrA genes in the anode were low, while the pmoA genes in the cathode were high. The operation of MFCs in CWs changed the exoelectrogenic and methanogenic community structures. Sequencing analysis indicated that phylotypes related to Geobacter, Bacteroides, and Desulfovibrio were specifically enriched in the CC systems. The results demonstrated that the operation of MFCs in the CWs resulted in the competition between the electrogenes and methanogenes, which resulted in distinctive microbial populations and biochemical processes that suppressed the CH emissions from the CWs.