THE TREATMENT OF WASTE WATER OF DYEING BY FENTON OXIDATION IN PRESENCE AND ABSENCE OF ULTRASOUND

In this study, degradation of Reactive Red 141 (RR141) present in textile dyeing waste water was investigated by catalytic wet hydrogen peroxide oxidation over iron-containing ZSM-5 zeolite catalysts prepared by ion-exchange and hydrothermal synthesis methods. Higher decolorization (18.3%) and degradation (17.6%) degrees were obtained by waste water of dyeing with 0.5 wt% over ion-exchanged FeZSM-5 catalyst than those with waste water of dyeings in high dye concentration. Color removal was increased with H2O2 amount (up to 5 mmol) added to the reaction mixture. Decolorization degree increased from 15.7% to 18.6% in the combination of CWPO and ultrasound for waste water of dyeing with 0.5 wt%. However, as the concentration of dye in the waste water increased, the positive effect of ultrasound on decolorization disappeared.