Decolorization of reactive dyes wastewater using Fe(III)/H2O2

The treatment of dying industry wastewater is a difficult problem owing to the complex composition and difficulty for biodegradable. Decolorization of the Reactive Dye Benefix Red 5B in wastewater was investigated in laboratory-scale batch experiments using Fe(III)/H2O2. The dye degradations were studied for the result of dye removal efficiency and reduction in chemical oxygen demand (COD). The effect of operating parameters, such as pH, time, chemical concentration (H2O2 and Fe 3+ ), and dye concentration have been determined. The result showed that the efficiency of color and COD removal is strongly depend on the initial concentration of Fe(III) and H2O2. The reaction has been proved to be highly effective for the removal of Reactive Dye Benefix Red 5B in aqueous at pH 6.75 and dye concentration of 200 ppm at Fe(III)/H2O2 mole ratio of 1 and initial (Fe(III), H2O2)/ dye mole ratio of 0.03. A color removal efficiency of 95% and COD reduction of more than 70% from wastewater were already achieved after 24 hour. The results will be useful in designing for the dye contaminated wastewater treatment plants for decolorization of effluents from textile dyeing and finishing process containing reactive dyes. Keyword: Decolorization, Dye degradation, Wastewater, Reactive dyes, Textile dyes