Abstract
In this study, we focus on reviewing different types of inocula and substrate sources, which have been employed in bioelectrochemical systems (BES) for metal recovery and power generation. Their important roles and the effects on BES performance characterized by recovery and columbic efficiency are discussed. Results show that until now most BES studies use mixed cultures exploited from natural sources and sewage sludge to serve as inocula for stimulating the formation of the microbial community in the anode chamber. The higher adaptability, stability, and productivity of mixed cultures, as compared to single bacteria straina, are explained for their favorable use. Substrates supplied as carbon sources are also mostly pure substances, such as acetate and glucose, due to their rapid biodegradability and preferable consumption by exoelectrogen for electron production. The study also found that sources of inocula and substrate have significant effects on the microbial community, which then directly affected columbic efficiency. On the other hand, it was reported that inocula and substrates did not influence much on metal recovery efficiency.
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