Studies on Removal of Chromium (VI) from Wastewater Using Electrocoagulation

Electrocoagulation is an efficient method where the flocculating agent is generated by electro-oxidation of a sacrificial anode, generally made of iron or aluminium. In this study Al Electrodes are used to remove Cr (VI) from model wastewater by Optimizing different parameters pH, Current Density, Initial Concentration and Time. From our present study, it was found that the removal of chromium (VI) using aluminium electrodes by Electrocoagulation is a feasible process. At elevated pH, the removal of chromium is higher due to simultaneous co-precipitation and chemical precipitation. This effect is observed till the pH is increased to 7 and the percentage removal starts decreasing beyond that point. And Maximum removal efficiency of 96.89 % was achieved at an optimum current density of 58.60 mA/cm2. The samples from this experiment were analyzed using the atomic Absorption Spectroscopy (AAS).