An Efficient Removal of Arsenic from Industrial Effluents using Electro-coagulation as Clean Technology Option

This paper is a preliminary communication of a study on removal and recovery of heavy metals
from industrial waste waters using electro-coagulation (EC) technique. The larger study envisages use of solar
energy for producing the D.C. current, and simple chemical methods of standard methods in chemistry like use
of hydrochloric acid, hydrogen sulfide, collection of precipitate, incineration and getting metal oxides in the
most economical way of metal recovery. However, this paper reports on the removal of Arsenic (As) from
industrial effluent using electro-coagulation (EC) technique. The optimization has been performed to increase
the removal efficiency of As by varying initial pH (2-10), time of electrolysis (5-30min) and current density
(0.8-4.8 A/dm2). For the first time, we notice that the current density 4.8 A/dm2 has been observed to produce
the quickest removal (99.9%) within 10min. The phenomenal COD reduction from 400mg/l to 30mg/l with
electrolysis time of 15min is a significant finding, to achieve this type of COD reduction by the existing
methods generate huge quantities of sludge. The sludge formed in the reaction vessel also have been Investigated.