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采用二氧化氯(ClO2)作为二次供水的消毒剂进行静态实验研究,考察了ClO2投加量、氨氮与CODMn浓度及pH对ClO2衰减及消毒副产物氯酸盐(ClO3-)和亚氯酸盐(ClO2-)的生成影响,并建立了ClO3-和ClO2-生成浓度的经验预测模型。结果表明:前4 h内,随着消毒剂初始投加浓度提高,ClO2的衰减速率增加,4 h后降解则较缓慢。ClO2加入水中,立即有ClO3-与ClO2-生成,4 h后基本达到稳定,且随着药剂投加量的增加,ClO3-和ClO2-的生成量逐渐增大。氨氮、CODMn及pH的升高,可加速ClO2的衰减,同时可促进ClO3-和ClO2-的生成。其中,氨氮浓度从0.085 mg/L升高到0.585mg/L,ClO3-与ClO2-的生成浓度分别增加了6.49μg/L和8.32μg/L;CODMn从1.13 mg/L升高到3.13 mg/L,ClO3-与ClO2-的生成浓度分别增加了13.75μg/L和9.23μg/L;pH从6.49升高到8.45,ClO3-与ClO2-的生成浓度分别增加了13.28μg/L和10.01μg/L。
Chlorine dioxide (ClO2) was used as disinfectant for secondary water supply. The effects of ClO2 dosage, ammonia nitrogen concentration, CODMn concentration and pH on the decay of ClO2 and disinfection by-product chlorate (ClO3-) and chlorite Salt (ClO2-) formation, and establish the empirical prediction model of ClO3- and ClO2- generation concentration. The results showed that in the first 4 h, the decay rate of ClO2 increased with the initial dosing concentration of disinfectant increasing, and the degradation rate was slower after 4 h. ClO2 added to water immediately after the formation of ClO3- and ClO2-, 4 h after the basic stability, and with the dose of the drug increases, the formation of ClO3- and ClO2- gradually increased. Ammonia nitrogen, CODMn and pH increase, can accelerate the decay of ClO2, at the same time can promote the formation of ClO3- and ClO2-. The concentration of ammonia nitrogen increased from 0.085 mg / L to 0.585 mg / L, and the concentrations of ClO3- and ClO2- increased by 6.49μg / L and 8.32μg / L respectively. The CODMn increased from 1.13 mg / L to 3.13 mg / L, ClO3- and ClO2- increased by 13.75μg / L and 9.23μg / L, respectively. The pH value increased from 6.49 to 8.45, the concentrations of ClO3- and ClO2- increased by 13.28μg / L and 10.01μg / L.