Treatment of Dye Wastewater from Textile Industry by Electrocoagulation and Fenton Oxidation: A Review

Abstract

Textile and dyeing industry are the essential industries in the present scenario and have become one of the major sources of water pollution. This industry generates huge quantity of wastewaters containing high concentrations of dyes, surfactants, suspended solids and organic matter. The major classes of dyes according to their dyeing process in textile finishing are acid dyes, basic dyes, direct dyes, reactive dyes, disperse dyes, mordant dyes, solvent dyes, sulfur dyes and vat dyes. These dyes are very stable in the environment and persist under oxidation and reduction conditions, light exposure and biodegradation. Dyes consist of many toxic materials and can cause some serious harmful impacts in environment. From previous studies, it has been observed few conventional and biological methods are inadequate and insufficient for the treatment of wastewater from dye industries. Advance treatment processes such as electrocoagulation and Fenton oxidation process or combination of these processes can be a better option for treatment of such wastewater. This paper reviews the application of electrocoagulation and Fenton oxidation processes for the treatment of dye wastewater.