Decolorization of Azo Dye from Synthetic Wastewater using Fenton Oxidation Process

Advanced oxidation methods are powerful tools that can be used to remove dyes from effluents of wastewater. This study focuses on the Fenton oxidation method as an alternative one used for the removal of azo dyes from synthetic wastewater before discharge from textile industry effluents. The major system parameters associated with this process are dye concentrations of 15, 30, 60, and 100 mg/L, pH of 2.0, 3.0, 4.0 and 5.0, Ferrous ion concentration (Fe²⁺) of 5, 10, 15 and 20 mg/L, hydrogen peroxide (H2O2) of 10, 20, 40 and 80 mg/L, reaction temperature of 25, 35, 45 and 55 °C. The results indicated that optimal conditions of the maximum dye removal 99% were achieved at 15 mg/L, 4.0, 20 mg/L, 80 mg/L, and 35 °C of the azo concentration, pH, Fe²⁺ concentration, H₂O₂ concentration, and temperature, respectively. Experimental results showed that increased H₂O₂ and Fe²⁺ concentrations increase the dye removal percentage, demonstrating the synergistic effect of these two reagents in the Fenton oxidation method.