H_2O_2和氨氮影响臭氧化含溴水溴酸盐生成的机制

The Impact of H_2O_2 and Ammonia on the Mechanism of Bromate Formation During Ozonation of Bromide-Containing Water

研究了H_2O_2、O_3摩尔比、DOC、氨氮含量以及不同水质因素单独与共同作用对BrO_3^-生成的影响。结果表明,水中腐植酸和H_2O_2、O_3摩尔比对溴酸盐生成有较大影响。在不含腐植酸条件下,H_2O_2、O_3摩尔比小于5:1时,H_2O_2对BrO_3^-的生成有促进作用,且促进作用先增大后减小,H_2O_2、O_3摩尔比为1:1时对BrO_3^-生成的促进作用最大;H_2O_2、O_3摩尔比大于6:1时抑制BrO_3^-的生成。在水中存在腐植酸时单独臭氧化,DOC的质量浓度为1 mg/L时,促进了BrO_3^-的生成,DOC的质量浓度大于2 mg/L时,能抑制BrO_3^-的产生;在水中存在腐植酸时H_2O_2/O_3氧化,低含量的H_2O_2可以抑制臭氧化溴酸盐的产生。在不含腐植酸且NH_3-N的质量浓度为0.3 mg/L的条件下,H_2O_2、O_3摩尔比小于1时能促进BrO_3^-的生成。

This work investigated the effect of several factors including H2O2/O3 molar ratio, dissolved organic matter （DOC）, ammonia＇s content or their common influence on bromate formation. Humic acid in water and H2O2/O3 molar ratio has great influence on bromate formation. The results showed that without humic acid, H2O2 could promote bromate formation during H2O2/O3 molar ratio was less than 5：1,and the promotion effect first increases and then decreases. The H2O2/O3 molar ratio was 1：1, it can most effectively promote the bromate formation. Nevertheless, the H2O2/03 molar ratio was greater than 6：1, H2O2 could inhibit the bromated formation. Ozonation alone in the presence of humic acid, It promoted the bromate formation during the mass concentration of DOC was 1 mg/L. It eould inhibit the generation of bromate during the mass concentration of DOC was more than 2 mg/L （including 2 rag/L）. In H2O2/O3 oxidation in the presence ofhumic acid, Low concentration of H2O2 could inhibit the bromate formation. It can promote the formation of BrO3^- during H2O2/O3 molar ratio was less than lunder the condition that without humic acid and mass concentration of NH3-N was 0.3 mg/L.