Integration of MFC reduces CH4, N2O and NH3 emissions in batch-fed wetland systems

Zhu, Hui, Niu, Tingting, Shutes, R. Brian E., Wang, Xinyi, He, Chunguang and Hou, Shengnan (2022) Integration of MFC reduces CH4, N2O and NH3 emissions in batch-fed wetland systems. Water Research, 226 , 119226. ISSN 0043-1354 [Article] (doi:10.1016/j.watres.2022.119226)

Abstract

The combination of microbial fuel cells (MFCs) with constructed wetlands (CWs) for enhancing water purification efficiency and generating bioelectricity has attracted extensive attention. However, the other benefits of MFC-CWs are seldom reported, especially the potential for controlling gaseous emissions. In this study, we have quantitatively compared the pollutant removal efficiency and the emission of multiple gases between MFC-CWs and batch-fed wetland systems (BF CWs). MFC-CWs exhibited significantly (p < 0.01) higher COD, NH -N, TN, and TP removal efficiencies and significantly (p < 0.01) lower global warming potential (GWP) than BF CWs. The integration of MFC decreased GWP by 23.88% due to the reduction of CH and N O fluxes, whereas the CO fluxes were slightly promoted. The quantitative PCR results indicate that the reduced N O fluxes in MFC-CWs were driven by the reduced transcription of the nosZ gene and enhanced the ratio of nosZ/(nirS + nirK); the reduced CH fluxes were related to pomA and mcrA. Additionally, the NH fluxes were reduced by 52.20% in MFC-CWs compared to BF CWs. The integration of MFC promoted the diversity of microbial community, especially Anaerolineaceae, Saprospiraceae and Clostridiacea. This study highlights a further benefit of MFC-CWs and provides a new strategy for simultaneously removing pollutants and abating multiple gas emissions in BF CWs. [Abstract copyright: Copyright © 2022. Published by Elsevier Ltd.]

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