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Cathode influence on coulombic efficiency in microbial fuel cells (MFCs) treating wastewater

pubblicazioni - Poster

Cathode influence on coulombic efficiency in microbial fuel cells (MFCs) treating wastewater

The cathode influence on coulombic efficiency in microbial fuel cells (MFCs) treating wastewater is studied in this work.

MFC is capable of treating wastewater and generating electricity. An important parameter for monitoring performance is the coulombic efficiency (CE) that expresses the transformation of organics into useful electricity[1]. Different operating conditions were reported to increase the CE in MFCs[2-6]. In this study, the effects of cathode (1.25-10cm2) area[2], cathode PTFE external layers[3]and Pt-loading (0.005-1 mgPt/cm2)[4-5], and COD concentration (0.1-3gCOD/l)[4-5] on the CE were investigated in single chamber microbial fuel cells (SCMFCs). The results showed that the studied parameters affected the CE. The parameters were positively or inversely correlated with the performance, so that a compromise among different effects should be determined to enhance the CE of MFCs. The comparison between COD removal and CEs provided valuable information on competition between microbial metabolism on the electrode surfaces and in the bulk solution of SCMFCs, and the variations of the operational conditions that could affect this competition for higher CE values.

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