Evaluation of the Effectiveness of Most Important Treatment Methods for the Decolorization of Dyes

According to the increasing the water demand and thelack of its resources, the reuse of effluents is considered a useful optionin the water resources management. Dyeing industries are the largest consumer of water, and the major problem of their sewage production is the presence of their plenty of dyes and indissoluble. Among the various methods used to remove dyes, physical, chemical and biological methods can be mentioned over the past three decades. However, a small number of these methods are concerned by the paper industry and textile industries. Among the various methods of elimination of dyestuff, adsorption technique is an effective and efficient method and presents the best results for the decolorizationof various types of dyes. If the decolorizationof dyes is done properly, the wastewater is treated with good quality. Now, most commercial systems use of activated carbon because of their excellent absorption capacity as an absorbent for the decolorizationof dye in the wastewater. United States Environmental Protection Agency (USEPA) has introduced absorption method by activated carbon as one of the best technologies in the decolorizationof organic compounds‏.