OPTIMIZATION OF DECOLORIZATION OF METANIL YELLOW BY UV/FENTON PROCESS USING RESPONSE SURFACE METHODOLOGY

The main purpose of this work was to assess the decolorization of the Metanil Yellow dye wastewater by UV/Fenton process. The effects of operational parameters such as initial pH, initial concentration, molar ratio of [H2O2]/[Fe2+] and UV irradiation time on the decolorization of Metanil Yellow dye wastewater had been investigated in the study of laboratory scale. According to the treatment effect of single factor experiment, the optimum conditions for decolorization of Metanil Yellow dye wastewater were preliminarily determined. Compared with UV process and Fenton process alone, UV/Fenton had obvious synergistic effect on the decolorization of Metanil Yellow dye wastewater. Response surface methodology (RSM) was applied to optimize the conditions in UV/Fenton oxidation process using decolorization efficiency as the target factor, and initial pH, initial concentration, molar ratio of [H2O2]/[Fe2+] and UV irradiation time as control factors. The optimum values were found to be 3.26, 49.88 mg/L, 36.76:1 and 27.46 min, respectively. Under the optimal circumstances, the experiment was carried out to calculate the decolorization efficiency of 97.46% and the deviation forecast of 2.48%.