Study Of Disposal The Bhc In Drinking Water By Uv-catalyze Oxidation

Photo-catalytic oxidation, one kind of advanced oxidation technologies (AOTs), has been successfully applied in the treatment of POPs in water, having been drawn high attention from the domestic and oversea scholars.Removal of BHC (Benzenehexchloride) which is a typical kind of POPs was studied in our research. Firstly,single UV technology was adopted to remove BHC. The effect of different initial BHC concentrations, UV irradiation intensity and pH value on removal efficiency was studied. The results show that under the fixed UV irradiation intensity, the variation of the initial concentration ofα-BHC has little effect on degradation. And experimental data basically match the first order kinetic model through fitting the degradation kinetic parameters. While under the fixed initial concentration ofα-BHC, the reaction rate constant increase as the irradiation intensity increased. Under the fixed UV irradiation intensity and initial concentration, the degradation rate ofα-BHC was higher at alkaline condition. Secondly, different initial concentration of H2O2 on removal efficiency was also studied. The result indicates that the reaction rate constant increases obviously as the initial concentration of H2O2 increase, but exorbitant H2O2 concentration may inhibit photo degradation reaction. Thirdly, the initial mass concentration of TiO2 onα-BHC removal efficiency was studied. When the mass concentration ofα-BHC is in the range between 50 mg/L and 400 mg/L, the photo-degradation reaction rate constant K increases as the initial concentration of UV/TiO2 increase. The particle diameter of TiO2 also has effect on the degradation rate, the smaller the particle size, the bigger the degradation rate. Furthermore, combination technology such as UV90-US30 and US30-UV90 on the removal efficiency was studied; the results show that the degradation rate of US30-UV90 technology was 35 percent higher than that of UV90-US30 technology. This study demonstrated that photo-catalytic oxidation method has great removal efficiency on BHC exist in drinking water.