Figure 6

(A) The maximum produced current density versus the oxalate flow rate in the macro-scale MFC. (B) The variation of maximum current density in the macro-scale MFC versus the related value in the micro-scale MFC. (C) The variation of oxalate concentration in the outlet stream of the micro-scale MFC. Oxalate inlet concentration was 156 mg l−1. (D) Oxalate concentration in outlet stream based on the organic loading rate in the micro-scale MFC. The error bars represent the variation of power and current densities among repeated experiments.