evaluation of adsorption process in dye removal from industrial wastewater

Abstract Introduction: Innovative processes for treatment of industrial effluents containing dyes and heavy metals are often used to reduce the toxicity of these compounds in order to reach the refining standards. Recently, a special focus on innovative processes took place for physical and chemical removal by new absorbent, biomass absorption, membrane filtration, radiation, and electrochemical coagulation. In this study, the recent developments and application of different treatment methods was analyzed for dyes removal from industrial wastewater. Methods: This study extracted from 45 articles of different sites between 1997 until 2014, which it was evaluated the advantages and limits of adsorption process. The main operating conditions affecting on the absorption process such as pH, temperature, concentration of pollutants and dose of contaminants were evaluated for dyes treatment. Conclusion: This review study indicated that the pH factor was frequently studied and its impact has been widely studied in treatment of contaminated wastewater with dyes. Previous studies had shown that adsorption process will be the most promising methods of treatment in the complex systems at the near future. Adsorption process for removing of organic contaminants and metals recovery systems have shown a good performance in the batch reactor. Among of conventional processes, adsorption is known as one of the most effective technology for wastewater treatment of organic and inorganic pollutants with concentrations less than 1000 mg/l. It is important to note that the cost of treatment method varies depending on the used process and the local conditions. In general, the key factors in choosing a method are usability of method, simplicity of design and cost benefits. The adsorption process provided all benefits and it is suitable for the removal of dyes from wastewater.