| Microbial fuel cell (MFC) is a device directly converting microbial metabolic power into electricity with the microbial catalysts, which has the advantages of abundant fuel resource, mild reaction condition and high efficiency. Because of its harmfulness for the ecological environment, and has a strong oxidation and high redox potential, and has the possibility of being cathode electron acceptor. It has of important scientific value and practical significance for practical application to study the MFC for chromium wastewater treatment and its factors that affect the MFC performance.To study the feasibility of Cr(â…¥) as cathode electron acceptor, this study utilized the two chamber-MFC, by using synthetic Cr(â…¥)-containing wastewater as catholyte and anaerobic microorganisms as anodic biocatalyst, Cr(â…¥) at 100 mg/L was completely removed during 150 h (initial pH 2). The maximum power density of 150 mW/m~2 (0.04 mA/cm~2) and the maximum open circuit voltage of 0.91 V were generated with Cr(â…¥) at 200 mg/L as electron acceptor. In addition, comparison of cell performance using dichromate (10 mM), hexacyanoferrate (10 mM) and oxygen (without Pt-loading) as cathodic electron acceptor respectively was done. This work for the first time verifies the possibility of simultaneous electricity production and cathodic Cr(â…¥) reduction. This study demonstrated that this MFC has very good prospects for research and application for the chromium reduction and electricity production.
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