Photocatalytic Degradation of Dye Wastewater by Advanced Oxidation Processes-Solar/TiO_2 UV/Fenton and UV/H_2O_2
【摘要】：正Most of wastewater from textile industries in Taiwan contains high alkalinity , high temperature , non-biodegrade- ability , obvious color and organic pollutants, etc.. Therefore, this study will focus on the feasibility and treatment efficiency of advanced oxidation processes(AOPs)-Solar/ TiO2、Fenton、UV/Fenton and UV/H2O2 for three different kinds of simulated dye wastewater. The optimum conditions, TOC removal and color (ADMI) removal efficiency will be investigated. As to Solar/TiO2 method, several variables including pH、 TiO2 dosages、dye concentrations、 TiO2 nanosizes and types of dye will be studied and discussed. According to optimum conditions obtained, TOC removal percentages showed that method of UV/ Fenton is best, Solar/TiO2 and Fenton next and UV/H2O2 the lowest for dilute simulated dye wastewater. While ADMI removal percentages, all different processes are excellent except color removal for S-RL by Solar/TiO2 and FBB by UV/H2O2 methods. The optimum initial pH all remained 3 for the degradation of dyes by Fenton, UV/Fenton and Solar/TiO2. UV/H2O2 process improved obviously for the treatment efficiency of S-RL which showed treatment difficulty by other methods. For highly concentrated dye wastewater (COD=500mg/L), the treatment efficacy will be UV/FentonFentonSolar/TiO2UV/H2O2 by the study of their corresponding kd0 and t(1/5) values. Among them, UV/H2O2 is the poorest. Both Langmuir adsorption isotherm and modified Langmuir-Hinshelood kinetic model (L-H model) fit the experimental data well and their adsorption constants are quite close by either isotherm or modified L-H model.