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Comparison of Electricity Generation Efficiencies depending on the Reactor Configurations in Microbial Fuel Cells  

Lee, Yunhee (Department of Railroad, Civil & Environmental Engineering, Woosong University)
Oa, Seong-Wook (Department of Railroad, Civil & Environmental Engineering, Woosong University)
Publication Information
Journal of Korean Society on Water Environment / v.26, no.4, 2010 , pp. 681-686 More about this Journal
Abstract
Two different MFC designs were evaluated in batch mode: single compartment combined membrane-electrodes (SCME) design and twin-compartment brush-type anode electrodes (TBE) design (single chamber with two air cathodes and brush anodes at each side of the reactor). In SCME MFC, carbon anode and cathode electrodes were assembled with a proton exchange membrane (PEM). TBE MFC was consisted of brush-type anode and carbon cloth cathode electrodes without the PEM. A brush-type anode was fabricated with carbon fibers and was placed close to the cathode electrode to reduce the internal resistance. Substrates used in this study were glucose, leachate from cattle manure, or sucrose at different concentrations with phosphate buffer solution (PBS) of 200 mM to increase the conductivity thereby reduce the internal resistance. Hydrogen generating bacteria (HGB) were only inoculated in TBE MFC. The peak power densities ($P_{peak}$) produced from the SCME systems fed with glucose and leachate were 18.8 and $28.7mW/m^2$ at external loads of 1000 ohms, respectively. And the $P_{peak}$ produced from TBE MFC were 40.1 and $18.3mW/m^2$ at sucrose concentration of 5 g/L and external loads of 470 ohms, with a mediator (2-hydroxy-1, 4-naphthoquinone) and without the mediator, respectively. The maximum power density ($P_{max}$) produced from mediator present TBE MFC was $115.3mW/m^2$ at 47 ohms of an external resistor.
Keywords
Bioelectricity; Hydrogen generating bacteria; Mediator; Microbial fuel cells (MFCs); Proton exchange membrane;
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