Trivalent chromium (Cr 3+) removal from aqueous solution by electrocoagulation using iron electrodes material was investigated in this paper. Effects of current density, initial concentration of Cr 3+ , operating time, pH, electrode distance, and operating cost have been investigated. At higher current density and solution pH, remarkable removal of Cr 3+ was observed. Experiments have been show that the maximum removal percentage of the Cr 3+ 99.89 % was at initial concentration 1000mg/L, current density 9.34mA/cm 2 and reaction time 1 hours. Energy consumption was calculated for Cr 3+ removal at different time. The method is observed to be very effective in the removal Cr 3+ ion from aqueous solution. Electrocoagulation process need simple equipment, designable any size, use any chemical substances and low operating cost. DOI: http://doi.dx.org/10.5564/mjc.v15i0.330 Mongolian Journal of Chemistry 15 (41), 2014, p89-93.
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