In the present study, the Cu electrodes (Fig. 2) did not show high Cr removal efficiencies. Removal efficiencies of 68.08%(at 1.5 V for 50 min) and 69.91% (at 2.0 V for 100 min) were obtained. In the case of Fe electrodes, removal efficiencies of 90.27% and 82.57% were obtained at 2.5 V and 3.0 V, respectively for 100 min. Therefore, it can be concluded that the increase in potential did not affect the removal of Cr.