LAB SCALE STUDY OF ELECTRO-COAGULATION PROCESS FOR ZINC & IRON REMOVAL FROM METAL PLATING INDUSTRIAL WASTEWATER

摘要

Generation and discharge of industrial waste water is becoming a serious problem for our environment and water bodies. So, there is a need of some efficient waste water treatment technique. In this study waste water from a metal plating industry was collected and treated by electro-coagulation process. A lab scale model of electro-coagulation was set up using iron and aluminum electrodes. Samples were treated and analyzed at varying pH of 3, 5 and 7 at different values of current (i.e. 1 A, 1.5 A, 2 A and 2.5 A) using different combinations of iron and aluminum electrodes for a contact time of 10, 20 and 30 minutes. The optimum conditions of treatment were determined. It was observed from the experiments that Al-Al electrode pair was able to achieve 99.78 % zinc removal and 99.89 % iron removal at 1.5 A current and at optimum pH of 7 during 20 min contact time with electrical energy consumption of 12 kWh/m~3.