Abstract
Constructed wetland-microbial fuel cell coupling system is a new type of bioelectrochemical system that couples constructed wetland and microbial fuel cell. The system plays an important role in biological power generation and sewage purification. The principle is that the bottom of the constructed wetland bed (low ORP) serves as the anode of the microbial fuel cell. The organic matter in the water is degraded under the action of the electricity-producing microorganisms and released during the degradation process. The electrons are transferred along the external circuit to the biocathode on the surface of the bed (higher ORP) to complete the redox reaction. This article summarizes the research progress of the microbial fuel cell-constructed wetland coupling system from two aspects: system structure and factors affecting system operation. The system structure includes electrode materials, substrates, wetland plants and microorganisms. The influencing factors include HRT, DO, organic matter concentration and wastewater composition, electrode structure. Finally, the problems and research directions of the microbial fuel cell-constructed wetland coupling system are summarized, and the research potential of the system is prospected.
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