Removal of Cr(VS) from the Chrome Electroplating Effluent by Reduction and Adsorption Using Powdered Activated Charcoal

摘要

A powdered activated charcoal (PAC) based process was evaluated at a bench and pilot scale to determine its effectiveness towards the removal of Cr(VI) from the electroplating effluent. In the first step, reduction of Cr(VI) to Cr(III) was achieved while in a second step Cr(III) was removed by adsorption. In both steps PAC is utilized. Different experimental parameters affecting the reduction of Cr(VI) by PAC were investigated. The rate of reduction reaction was found to be dependent on the pH of effluent and the dose of PAC. Removal of Cr(III) from initially treated effluent was achieved under optimum condition of pH and dose of PAC. After a bench scale experiments, the reduction and removal of chromium from the effluent was achieved at a pilot scale successfully. The experimental result suggests that PAC is a suitable material for the reduction and removal of chromium from the electroplating effluent.