Effect of operating parameters on the decolorization and oxidation of textile wastewater by the fluidized-bed Fenton process

Abstract

This study investigated the treatment of textile industrial wastewater from a dyeing and finishing mill by the fluidized-bed Fenton process. Operating variables, such as the pH, concentrations of H 2O 2 and Fe 2+, are used to explore the respective effects on the oxidation and decolorization of the textile wastewater. The experimental results were estimated in terms of chemical oxygen demand (COD) and color reductions to examine the treatment efficiency. The optimum pH was observed to be around 3. The decolorization and the oxidation efficiencies could achieve 92% and 49%, respectively, in only 2 min of reaction under the concentration ratio of [COD]:[Fe 2+]:[H 2O 2] = 1:0.95:3.17. By using this process, the oxidation of textile wastewater increased with increasing H 2O 2 dosage. The highest level of oxidation was 87%.