Treatment of Coal Stockpile Wastewater by Electrocoagulationusing Aluminum Electrodes

Abstract

The performance of electro coagulation system with aluminum and iron electrodes to remove heavy metals from actual wastewater of coal's stockpile which has studied. The effects of process variables such as electrode material, current density and operation time for electro coagulation process are investigated on ferrous and manganese removal efficiencies. Preliminary results show that the electro coagulation process is able to enhance the removal of heavy metal contents. The batch experiment results showed that the high heavy metals which is contained wastewater coal's stockpile can be effectively treated by electro coagulation system using aluminum electrodes. The overall removal efficiencies of heavy metals have been obtained at 89.7% for ferrous and 94.6% for manganese, respectively. The removal rates of those elements were increase with operation time. Therefore, electro coagulation technique to remove high content of heavy metal and TSS from wastewater of coal's stockpile is found effective and friendly with the environment.