Abstract
Power production characteristics and substrate concentration dependence of voltage have been investigated together with the determination of kinetic constants in two-chambered mediator-less microbial fuel cells (MFC) for acetate and peptone substrates. At 500 mg DOC l-1 (dissolved organic carbon), power densities normalized to the anode surface of 112 mW m-2 with acetate and 114 mW m-2 with peptone as electron donor were attained by applying cathodes with a Pt catalyst layer. Related anode surface specific substrate removal rate was 44 g DOC m-2 h-1 for acetate and 52gDOCm-2h-1 for peptone. Substrate concentration dependency of the voltage suggests Monod-like kinetics with extremely low, <1 mg DOC l-1, half saturation constants and with final DOC concentrations of 6-10 mg l-1. Acetate and peptone are equivalent substrates for the exoelectrogenic bacteria both from the point of view of biodegradation kinetics and power production characteristics.
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