Comparative Study of As (III) Removal Efficiency from Water by Electrocoagulation and Conventional Coagulation

The purpose of this paper was As (III) removal from simulated water by electrocoagulation (EC). The working conditions were: pH = 7, As (III) concentration 100 μg/L, and 0.01 M NaCl as supporting electrolyte. The sacrificial anode was made of aluminium and applied current densities were 25, 50 and 150 A/m 2 at various electrolysis times. The results of EC were compared with those obtained by conventional coagulation (CC). The coagulation reagent was AlK(SO4)2 . 12H2O at the same concentration of Al 3+ in solution as in EC experiments and working conditions: solutions of 100 μg/L As (III) and pH = 7. By comparison, As (III) was practically removed from solutin by EC, while arsenic residual concentration was 63.08 mg/L for 604 mg/L of alum by CC.