Performance of bromochloracetonitrile degradation by O_3/H_2O_2/UV process in drinking water

In order to reduce the carcinogenic risk of nitrogenous disinfection by-products in drinking water produced by chorination process,degradation of bromochloracetonitrile(BCAN)by individual O3,H2O2,UV and their combined process was performed.The mechanisms and kinetics were also discussed.Results indicated that the degradation efficiencies by individual process O3,H2O2 or UV were not as good as combined process UV/H2O2 or UV/H2O2/O3.Under the conditions of the initial mass concentration of BCAN 20μg/L,UV light intensity 31μW/cm2,mass concentration of H2O2 40 mg/L,O37.9 mg/L and the reaction time 120 min,the degradation efficiencies by UV/H2O2 and UV/H2O2/O3 could be up to 77.50% and 94.05%,respectively.The latter process gained higher efficiency.The BCAN degradation process by UV/H2O2 and UV/H2O2/O3 fit the first-order kinetic model.