Effect of spray aeration on unregulated drinking water disinfection byproducts

AWWA water science Pub Date : 2023-05-22 DOI:10.1002/aws2.1341

Kathleen R. Beaudoin, Jeanne M. VanBriesen, David A. Dzombak

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Abstract

Spray aeration is a comparatively low-cost option to reduce trihalomethane (THM) concentrations in distribution system storage. The effect of spray aeration on unregulated, toxic disinfection by-products was investigated in a bench-scale apparatus in closed-tank and open-tank experiments. In the closed-tank experiments, initially over 90% of THMs, trichloroacetonitrile, and chloropicrin were removed, while 36% of dihaloacetonitriles were removed. However, due to the buildup of concentrations in the tank headspace, removal rates for all compounds decreased significantly with time, falling to 44% removal of THMs, 76% removal of trichloroacetonitrile, and 58% removal of chloropicrin. Removal of dihaloacetonitriles decreased to zero. In the open-tank experiments, THM removal rates were high and did not decrease with time. Considering the results with open and closed tanks as approximate bounds for performance expected under real-world conditions in storage tanks, the findings suggest that spray aeration may not significantly reduce haloacetonitrile-related toxicity while halonitromethane-related toxicity may be reduced.

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喷雾曝气对非调节饮用水消毒副产物的影响

喷雾曝气是降低分配系统储存中三卤甲烷（THM）浓度的一种相对低成本的选择。在封闭池和开放池实验中，在实验室规模的装置中研究了喷雾曝气对未调节的有毒消毒副产物的影响。在密闭罐实验中，最初去除了90%以上的THM、三氯乙腈和氯化苦，同时去除了36%的二卤代乙腈。然而，由于罐顶部空间中浓度的增加，所有化合物的去除率都随着时间的推移而显著下降，THMs的去除率降至44%，三氯乙腈的去除率为76%，氯化苦的去除率则降至58%。二卤代乙腈的去除率降至零。在开罐实验中，THM的去除率很高，并且不会随着时间的推移而降低。考虑到开放式和封闭式储罐的结果是储罐在真实世界条件下预期性能的近似界限，研究结果表明，喷雾曝气可能不会显著降低卤代乙腈相关的毒性，而卤代硝基甲烷相关的毒性可能会降低。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

AWWA water science

CiteScore

4.40

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0.00%

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