Preliminary testing of EC using Al, Cu, and Fe electrode pairs(anode and cathode) were conducted using the raw effluent in the potential range 0.5–3.0 V for 60 min in order to determine the best potential range for Cr removal. Suitable potential ranges for Cr removal with Al and Fe electrodes were deter-mined to be 2.5–3.0 V, whereas the potential range for Cu electrodes was determined to be 1.5–2.0 V. Once the optimum potential range for each type of electrode was identified, the EC tests were conducted for longer time (at least 100 min), in order to obtain the best efficiency of chromium removal.