Progress in Microbial Fuel Cell Coupled Constructed Wetlands

doi:10.13560/j.cnki.biotech.bull.1985.2018-0575

Abstract

Abstract: Microbial fuel cell coupled constructed wetlands（CW-MFC）is a new type of wastewater treatment system that combines constructed wetland（CW）and microbial fuel cell（MFC）. The electricigen generate electrons in the wetland of underlying where an anaerobic environment（anode）is,and the electrons cross the external circuits to surface wetland（cathode）to complete the redox reaction. However,the research on the CW-MFC in recent years is rare and simple. In this paper,the effects of electrode materials,water conservancy conditions,wetland plants and microbes on wastewater treatment capacity and electricity-generating capacity of CW-MFC are reviewed. For electrode materials,the power generation and decontamination ability of CW-MFC could be effectively improved while using materials with high conductivity,adsorption,and large effective area as electrodes. Regarding water conservancy conditions,the up flow or up flow-down flow type of water inlet should be used in CW-MFC under the condition of HRT of 2-3 d. Considering wetland plants,the CW-MFC planted with wetland plants is superior to those without wetland plants in terms of decontamination and electricity production. On microbes,there are significant differences in the microbial community structure between the cathode and the anode;however,the composition of the electricigen is very similar. The types of common electricigen in CW-MFC include Geobacter,Desulfobulbus,Pseudomona and Desulfovibrio,etc.,respectively. Finally,the challenges and research directions of CW-MFC are analyzed briefly. This review aims to provide reliable experimental reference and theoretical basis for CW-MFC’s future application.

Key words: CW-MFC, electrode material, water conservancy conditions, wetland plants, electricigen

WANG Guo-zhen, WEN Hong-yu, CAI Jia-ying, YUAN Zhen-ya, WANG Xiu-ying, SU Si-ting. Progress in Microbial Fuel Cell Coupled Constructed Wetlands[J]. Biotechnology Bulletin, 2019, 35(1): 199-206.

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