【摘要】 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。更多还原

【Abstract】 Chlorine dioxide(ClO2) was adopted as a disinfectant for a secondary water supply.Under simulated static experimental conditions,the effects of ClO2 dosage,NH3-N and CODMn concentrations,and pH on the attenuation of ClO2 and the formation of chlorate(ClO-3) and chlorite(ClO-2) were investigated,and the predictive models for the produced ClO-3 and ClO-2 concentrations were developed.The results showed that in the initial 4 h,the attenuation rate of ClO2 quickly increased with an increase in ClO2 dosage;the attenuation of ClO2 slowed down thereafter.ClO-3 and ClO-2 were produced immediately after adding ClO2,and their concentrations approached stable after 4 h.An increase in ClO2 dosage resulted in elevated concentrations of the produced ClO-3 and ClO-2.The increase of NH3-N and CODMn concentrations and pH promoted the attenuation of ClO2 and the formation of ClO-3 and ClO-2.The concentrations of ClO-3 and ClO-2 were increased by 6.49 μg/L and 8.32 μg/L in correspondence to an increase of NH3-N concentration from 0.085 mg/L to 0.585 mg/L,by 13.75 μg/L and 9.23 μg/L in correspondence to an increase of CODMn concentration from 1.13 mg/L to 3.13 mg/L,and by 13.28 μg/L and 10.01 μg/L in correspondence to an increase of pH from 6.49 to 8.45.更多还原