Investigation of color and cod removal from wastewater containing disperse yellow 119 and disperse red 167 using fenton oxidation process

Abstract

Textile dye wastewater contains salts and trace elements beside dyestuff and suspended solid (SS) content. Textile dye wastewater may cause important environmental problems due to high dye contents, important amount of suspended solid content and high chemical oxygen demand (COD). Dyestuff used in textile dyed is known to be removed in traditional aerobic treatment systems. Recently advanced oxidation processes (AOP) like Fenton process have been successfully used in treatment of industrial wastewater that contains nonbiodegredable and toxic matters. Especially Fenton oxidation has been applied for textile dye processes and decolorization of wastewater that contains dye. In this study optimum values were determined for parameters such as pH, Fe+2 and H2O2, temperature, slow mixing time doses for decolorization by Fenton Process of C.I. Disperse Yellow 119 and Disperse Red 167, two of disperse dyes whose production are increasing more and more everyday and which are used more commonly and intensively for dying polyester fiber. We also evaluated the removal efficiency of color and COD at these optimum conditions. The overall color and COD removal efficiencies were 99.70% and 98.70% for Disperse Yellow 119 and 97.20% and 96.10% for Disperse Red 167 under determined conditions, respectively.