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首页> 外文期刊>Chinese science bulletin >Formation and distribution of disinfection by-products during chlorine disinfection in the presence of bromide ion
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Formation and distribution of disinfection by-products during chlorine disinfection in the presence of bromide ion

机译：溴离子存在下氯气消毒过程中消毒副产物的形成和分布

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摘要

The influences of contact time and pH value on the formation and distribution of four species of trihalomethanes and five species of haloacetic acids during chlorination in the presence of bromine were investigated. Results showed that the distribution of molar fraction of trihalomethanes varied with contact time due to the change of bromide ion concentration during chlorination. Most of the trihalomethanes comprising bromine-containing species and the favored products of the haloacetic acids were chlorine-containing species after 24 h of chlorination. The extent of bromine incorporation in trihalomethanes and haloacetic acids both decreased with time. The contact time also had influence on the formation rate of different species of haloacetic acids. The formation and distribution of trihalomethanes and haloacetic acids strongly depended on the chlorination pH value. All of the trihalomethanes species formation increased with the increase of pH value except the bromoform that had not been detected. The molar fraction of bromodichloromethane and dibromochloromethane containing bromine increased with pH value while chloroform without bromine decreased. Under the pH range studied in this experiment, the predominant haloacetic acids species were trichloroacetic acid and dichloroacetic acid which all decreased with the increase of pH value and the level of TCAA was higher than that of DCAA.
机译：研究了接触时间和pH值对溴存在下氯化过程中四种三卤甲烷和五种卤乙酸的形成和分布的影响。结果表明，由于氯化过程中溴离子浓度的变化，三卤甲烷的摩尔分数分布随接触时间而变化。在氯化24小时后，大多数包含卤代物质和卤代乙酸有利产物的三卤甲烷是含氯的物质。三卤代甲烷和卤代乙酸中溴的掺入程度均随时间降低。接触时间也影响不同种类卤代乙酸的形成速率。三卤代甲烷和卤代乙酸的形成和分布在很大程度上取决于氯化pH值。除未检测到的溴仿外，所有三卤甲烷物种的形成均随pH值的增加而增加。含溴的溴代二氯甲烷和二溴氯甲烷的摩尔分数随pH值而增加，而不含溴的氯仿则降低。在本实验研究的pH范围内，主要的卤乙酸种类为三氯乙酸和二氯乙酸，它们均随pH值的增加而降低，TCAA的含量高于DCAA。

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