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二氧化氯应用于二次供水安全消毒的静态研究

Keywords: 二氧化氯,二次供水,氯酸盐,亚氯酸盐,消毒副产物

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Abstract:

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4h内,随着消毒剂初始投加浓度提高,ClO2的衰减速率增加,4h后降解则较缓慢。ClO2加入水中,立即有ClO3-与ClO2-生成,4h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0.085mg/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1.13mg/L升高到3.13mg/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。

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