2008 Volume 87 Issue 10 Pages 846-851
In recent years, recycling of organic waste has been needed in Japan. To make biogas and compost are usual ways of the recycling today. And a microbial fuel cell (MFC), a direct generator using microorganism from organic and inorganic compounds, has been investigated recently. Volatile fatty acid, food processing wastewater and landfill leachate were used to produce electricity by MFC in the past studies. But there is little knowledge about MFC using wheat bran. We tried to produce electricity by the MFC using wheat bran and succeeded to generate between 0.2V and 0.36V for 250 hour. The factors affecting MFC performance were investigated, we found that substrate concentration, a kind of mediator, ion concentration and electrode material could affect the MFC performance. We tested the discharge transient behavior of the MFC and fitted theoretically calculated values to observed values. By the fitting, we clarified the equivalent circuit constant, i.e., inner resistances and capacitor of the MFC.