UV/H_2O_2/O_3联用降解饮用水中的三氯硝基甲烷

Degradation of Trichloronitromethane in Drinking Water by UV /H_2O_2/O_3 Process

分别采用O3、H2O2、UV及其联用技术降解饮用水中的含氮消毒副产物三氯硝基甲烷(TCNM),考察了不同反应条件下对TCNM的降解效果及其影响因素,并探讨了其降解机理。结果表明,单独O3、H2O2和UV工艺对TCNM的去除效果不理想,而UV/H2O2和UV/H2O2/O3组合工艺能够有效去除TCNM。当TCNM初始浓度为20μg/L、紫外光强为31μW/cm2、H2O2投加量为15 mg/L、臭氧投加量为10 mg/L时,反应150 min后,UV/H2O2、UV/H2O2/O3组合工艺对TCNM的去除率分别为82.26%和97.28%,两种工艺对TCNM的降解均符合一级反应动力学。

O3, HE OE, UV, and their combinations were respectively used to degrade trichloroni- tromethane （TCNM） containing nitrogenous disinfection by-products in drinking water. The degradation efficiency of TCNM and the influence factors under different reaction conditions were investigated, and the degradation mechanism and kinetics were explored. The results indicated that the removal efficiencies of TCNM by O3, H2O2 and UV were not ideal, while UV/H2O2 and UV/H2O2/O3 could effectively re- move TCNM. The removal efficiency of TCNM by UV/H2O2 could be up to 82.26% when the initial con- centration of TCNM, UV light intensity, H20a dosage and reaction time were 20 μg/L, 31 p,W/cm2, 15 mg/L and 150 rain, respectively. In the UV/H2O2/O3 process, when the UV light intensity, H2O2 dos- age and O3 97.28% aft corded with dosage were 31μW/cm2, 15 mg/L and 10 rag/L, the removal rate of TCNM reached er reaction for 150 min. The TCNM degradation by UV/H2O2 and UV/H2O2/O3 process ac- the first-order kinetics model