Substrate concentration dependence of voltage and power production characteristics in two-chambered mediator-less microbial fuel cells with acetate and peptone substrates
2017
Tardy, Gábor Márk | Lóránt, Bálint | Lóka, Máté
OBJECTIVES: 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. RESULTS: 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 52 g DOC m⁻² h⁻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. CONCLUSIONS: 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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