Bromate removal by gamma irradiation in aqueous solutions  

作　　者：Zhao-Lian Ye Xue-Hui Fang Hui-Qi Hou 

机构地区：[1]College of Chemistry and Environmental Engineering,Jiangsu University of Technology [2]Department of Environmental Science and Engineering,Fudan University

出　　处：《Nuclear Science and Techniques》2016年第1期44-49,共6页核技术（英文）

基　　金：Supported by National Natural Science Foundation of China (No. 10979020)

摘　　要：Bromate(BrO_3) is a disinfection by-product in drinking water, and its removal is very difficult especially at low levels.60 Co gamma rays were used to remove BrO_3in aqueous solution in this study. The effects of absorbed doses, BrO_3initial concentration, gas saturation, p H value and coexisting anions(Cl, NO 3, SO2 4and HCO 3=CO_3^(2 -))on BrO_3reduction were evaluated. After 4.0-k Gy irradiation of air-equilibrated solution of 30.7 lg/L BrO_3, the residual BrO_3was 8.3 lg/L, which is below the maximum contaminant level of drinking water. The BrO_3reduction rate increased with the dose, in the order of N2[ air [ O_2[ N_2O atmosphere under similar conditions. The results also show that high p H favored the BrO_3removal. According to the experimental results, it can be concluded that the efficiency of decomposing BrO_3by reactive species followed the order of e aq[ H [ HO_2 [ O_2. Coexisting Cl, HCO 3=CO_3^(2 -)and SO2 4ions have little effect on BrO_3removal, whereas NO_3can inhibit its removal as a result of competition with BrO_3for e aq.Bromate （BrO-3） is a disinfection by-product in drinking water, and its removal is very difficult especially at low levels. 60Co gamma rays were used to remove BrO3 in aqueous solution in this study. The effects of absorbed doses, BrO3 initial concentration, gas saturation, pH value and coexisting anions （C1 , NO3, SO2/4- and HCO-3/CO2/3-） on BrO3 reduction were evaluated. After 4.0-kGy irradi- ation of air-equilibrated solution of 30.7 pg/L BrO3, the residual BrO-3 was 8.3 μg/L, which is below the maximum contaminant level of drinking water. The BROW- reduction rate increased with the dose, in the order of N2 〉 air 〉 02 〉 N20 atmosphere under similar condi- tions. The results also show that high pH favored the BrO3 removal. According to the experimental results, it can be concluded that the efficiency of decomposing BROW- by reactive species followed the order of ·e-aq 〉 · H 〉 HO2· 〉 0-2·. Coexisting CI-, HCO-3/CO2/3- and SO2/4- ions have little effect on BrO3 removal, whereas NO3 can inhibit its removal as a result of competition with BROW- for ·eaq.

关 键 词：Γ射线照射 水溶液 溴酸盐 吸收剂量 二氧化碳 高PH值 消毒副产物 含气饱和度 

分 类 号：R123[医药卫生—环境卫生学]