Study of an electrocoagulation (EC) unit for the tr eatment of industrial effluent of Ouagadougou, Burkina Faso

The assessment of industrial liquid waste of Ouagad ougou shows 91262 m 3 yr -1 total quantity of effluent composed mainly of tannery effluent. Treatment experiment by EC of these effluents allowed to eliminate chromiu m and to lower COD up to 86% abatement. The process designed for the treatment of liquid waste from tannery wor ks at 10.5 m 3 hr -1 for current density of 67.5 A.m -2 , 62.5 V, 1.2 kWh m -3 energy consumption, and produces 86,000 m 3 of clear water with 200 mg L -1 COD, 0 turbidity, 91% color abatement, 0 ppm chrom ium. The treatment produces nearly 480 m 3 yr -1 of sludge after compression using filter-press and 216 T of dry matter containing chromium and iron