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Characteristics of Electricity Production from Volatile Fatty Acids Using a Microbial Fuel Cell  

Noh, Jung-bin (인하대학교 환경공학과)
Hwang, Yong-woo (인하대학교 환경공학과)
Bae, Jae-ho (인하대학교 환경공학과)
Moon, Jin-young (인하대학교 환경공학과)
Publication Information
Journal of Korean Society of Water and Wastewater / v.20, no.2, 2006 , pp. 225-234 More about this Journal
Abstract
Characteristics of electricity production from major fermentation products (acetate, propionate and butyrate) were evaluated in a microbial fuel cell (MFC). For each substrate, batch and continuous experiments were performed. The batch test result indicated that coulombic efficiency depended on the resistance connected in MFC circuit. With acetate, coulombic efficiency were 87% at $20{\Omega}$, but decreaced to 45% at$220{\Omega}$. In continuous tests, maximum power densities obtained was 220 Q with acetate. The maximum power densities of butyrate, acetate and propionate were 6.8, 6.1, and $5.2mW/m^2$, respectively. Propionate and butyrate were converted into acetate producing high currents. $H_2$ produced during butyrate and propionate probably used to produce electricity. In conclusion, butyrate conversion into acetate was faster than that of propionate with higher electricity production. If the production of propionate is inhibited during fermentation, anaerobically fermented liguor may be effectively applied for MFC.
Keywords
microbial fuel cell (MFC); volatile fatty acids; coulombic efficiency; power density; fermentation;
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