Long-term performance of sediment microbial fuel cells with multiple anodes.
This study constructed multiple-anode SMFCs with different anode spacing and investigated their long-term performance. Results show that multiple anodes extended electricity generation from SMFCs due to increased anode surface area, but the distance between the anodes showed limited effects on power output. Power generation was seriously inhibited when temperature was below 20°C, but system recovered once temperature rose based to ambient condition. The degradation of readily oxidizable organic matter (ROOM) and decomposition of refractory organics occurred simultaneously. Worms' growth in the sediment destabilized power output, caused the increase of COD and decrease of pH and DO in water layer, and affected the microbial communities in sediments. ANME-2D related to anaerobic oxidation of methane was enriched around anodes and might benefit electron transfer in SMFCs.
School of Environmental Science and Engineering, Tianjin University, Yaguan Road 135, Tianjin 300350, China.
Qing
Q
Zhao
School of Environmental Science and Engineering, Tianjin University, Yaguan Road 135, Tianjin 300350, China.
Min
M
Ji
School of Environmental Science and Engineering, Tianjin University, Yaguan Road 135, Tianjin 300350, China. Electronic address: liruying@tju.edu.cn.
Ruying
R
Li
Department of Civil, Environmental, and Architectural Engineering, University of Colorado Boulder, Boulder, CO 80309, USA.
Zhiyong Jason
ZJ
Ren
D001419:Bacteria; D001674:Bioelectric Energy Sources; D004560:Electricity; D004566:Electrodes; D013696:Temperature; D014867:Water
D014867:Water
Ambient temperature; Anode distance; High-throughput sequencing; Multiple-anode sediment microbial fuel cell; Worms’ growth