Effect of chloride on the formation of volatile disinfection byproducts in chlorinated swimming pools
Effect of chloride on the formation of volatile disinfection byproducts in chlorinated swimming pools
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氯化物对氯化游泳池中挥发性消毒副产物形成的影响
DOI：
10.1016/j.watres.2016.09.018
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发表时间：
2016
期刊：
影响因子：
12.8
通讯作者：
Blatchley Ernest R. III
中科院分区：
文献类型：
--
作者：
Yue E.;Bai Hui;Lian Lushi;Li Jing;Blatchley Ernest R. III
氯化物可以在氯化游泳池水中积聚。虽然已经做出了大量的努力来研究卤离子对挥发性消毒副产物（DBP）形成的影响，但大多数都集中在溴化物上。氯离子浓度对游泳池中挥发性消毒副产物形成的影响在很大程度上尚未研究。研究了不同氯离子浓度和pH条件下典型前体物和体液模拟物（BFA）的氯化反应。在实验室和实际游泳池水样中，三种挥发性消毒副产物（NCl3、CHCl3和CNCHCl2）的形成均与氯离子浓度呈线性相关。还观察到游离氯消耗量随氯化物浓度增加而增加。这些行为似乎可归因于游离氯的形态变化，较高的氯化物导致较高浓度的分子氯（Cl2），其比HOCl更具反应性。这项工作的结果表明，改变池管理策略，以促进低氯化物浓度可能是重要的池中的挥发性消毒副产物的控制和节约游离氯的使用。
Chloride can accumulate in chlorinated swimming pool water. Although substantial efforts have been made to examine the effects of halide ions on the formation of volatile disinfection byproducts (DBPs), most have focused on bromide. The effects of chloride ion concentration on the formation of volatile DBPs in swimming pools remain largely unstudied. In this study, chlorination of typical precursors and body fluid analogue (BFA) were investigated with variable chloride concentration and pH. The formation of three volatile DBPs (NCl3, CHCl3and CNCHCl2) was observed to be linearly correlated with chloride concentration, both in bench experiments and in actual swimming pool water samples. Free chlorine consumption was also observed to increase with chloride concentration. These behaviors appear to be attributable to shifts in speciation of free chlorine, with higher chloride resulting in higher concentration of molecular chlorine (Cl2), which is much more reactive than HOCl. The results of this work suggest that changes in pool management strategies to promote low chloride concentration could be important for control of volatile DBPs in pools and to economize free chlorine usage.