Substrates and pathway of electricity generation in a nitrification-based microbial fuel cell.
Nitrification-based microbial fuel cell (N-MFC) is a novel inorganic microbial fuel cell based on nitrification in the anode compartment. So far, little information is available on the substrates and pathway of N-MFC. The results of this study indicated that apart from the primary nitrification substrate (ammonium), the intermediates (hydroxylamine and nitrite) could also serve as anodic fuel to generate current, and the end product nitrate showed an inhibitory effect on electricity generation. Based on the research, a pathway of electricity generation was proposed for N-MFC: ammonium was oxidized first to nitrite by ammonia-oxidizing bacteria (AOB), then the nitrite in anolyte and the potassium permanganate in catholyte constituted a chemical cell to generate current. In other words, the electricity generation in N-MFC was not only supported by microbial reaction as we expected, but both biological and electrochemical reactions contributed.
Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China.
Hui
H
Chen
Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China. Electronic address: pzheng@zju.edu.cn.
Ping
P
Zheng
Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China.
Jiqiang
J
Zhang
Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China; Zhejiang University of Science and Technology, Hangzhou 310023, China.
Zuofu
Z
Xie
Ocean University of China, Qingdao 266100, China.
Junyuan
J
Ji
Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China; Department of Chemical Engineering, University of Gujrat, Gujrat, Pakistan.
Abbas
A
Ghulam
D001674:Bioelectric Energy Sources; D058465:Nitrification; D009584:Nitrogen / Q000302:isolation & purification / Q000378:metabolism; D017672:Nitrogen Compounds / Q000378:metabolism*; D009606:Nitrosomonas / Q000378:metabolism
D017672:Nitrogen Compounds; D009584:Nitrogen
Electrogenesis pathway; Microbial fuel cell; Nitrification; Nitrogen removal