Removal of Arsenic from Water by Electrocoagulation and Electrodialysis Techniques

Abstract

Electrochemical methods have been described for the removal of arsenic from contaminated water due to their advantages in comparison to other removal methods. Only electrocoagulation and electrodialysis were used for this purpose. The present review article describes state-of-art of arsenic removal by using these techniques. Attempts have been made to explain the optimization for maximum removal of arsenic by controlling metal electrodes, pH of water, current densities, processing time and ionic concentration. The maximum arsenic removal achieved was brought down to the ppb level (10 ppb being permissible limit of World Health Organization in drinkable water). Efforts have also been made to explain the mechanism of arsenic removal by these techniques. Besides, the future perspectives of electrochemical techniques for the removal of arsenic have also been highlighted.