中文摘要：

Bromate（BrO3） 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 BrO3in aqueous solution in this study. The effects of absorbed doses, BrO3initial concentration, gas saturation, p H value and coexisting anions(Cl, NO 3, SO2 4and HCO 3=CO32 -)on BrO3reduction were evaluated. After 4.0-k Gy irradiation of air-equilibrated solution of 30.7 lg/L BrO3, the residual BrO3was 8.3 lg/L, which is below the maximum contaminant level of drinking water. The BrO3reduction rate increased with the dose, in the order of N2[ air [ O2[ N2O atmosphere under similar conditions. The results also show that high p H favored the BrO3removal. According to the experimental results, it can be concluded that the efficiency of decomposing BrO3by reactive species followed the order of e aq[ H [ HO2 [ O2. Coexisting Cl, HCO 3=CO32 -and SO2 4ions have little effect on BrO3removal, whereas NO3can inhibit its removal as a result of competition with BrO3for e aq.

英文摘要：

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.