Removal of color from textile wastewater containing azodyes by Fenton's reagent

Abstract

Wastewater from dyeing is a dangerous source of environmental contamination. Dyeing which is used in textile industry, is adding extreme color character to wastewater. Lots of textile industry use pigments and dyes in their products. In this study, the oxidation processes were carried out using Fenton reagent (Fe (2+)/ H2O2). During the study different pH range (3-6-9) and different Fe2+/ H2O2 molar ratios were used. The aim of this study is to present results concerning the optimization of azodyes removal to achieve decolourization by Fenton's reagent. Color measurements have been made using values of indexes of transparency parameter. Values of indexes of transparency = DFZ (DurchsichtsFarbZahl) in accordance with the EN ISO 7887 standards were obtained by taking absorbance in 436, 525 and 620 run. DFZ values were calculated from these measurements. Best experimental results were obtained at the pH value of 3 with the Fe2+/ H2O2 ratio of 1/5 (225 mg/L FeSO4/137 mg/L H2O2) by means of Fenton Process.