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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Effects of Alum Coagulation on Speciation and Distribution of Trihalomethanes (THMs) and Haloacetic Acids (HAAs)
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Effects of Alum Coagulation on Speciation and Distribution of Trihalomethanes (THMs) and Haloacetic Acids (HAAs)

机译：明矾凝结对三卤甲烷（THMs）和卤乙酸（HAAs）形态和分布的影响

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摘要

The impacts of alum coagulation on the distribution of disinfection by-products (DBPs), trihalomethanes (THMs), and haloacetic acids (HAAs) were evaluated under controlled chlorination conditions using four surface waters. Among the nine HAAs found in waters, dihaloacetic acids (X_2AAs) have been found to be the dominant species in all of the raw and alum treated waters. Alum coagulation tends to remove more mono-haloacetic acids (XAAs) and trihaloacetic acids (X_3AAs) precursors than that of dihaloacetic acids (X_2AAs). Alum coagulation treated water had a lower HAA_9/TTHM ratio compared with that of the raw water. The increase of THM bromine incorporation factors (BIF_α) value of alum treated water was statistically significant in comparison with the raw water. On average, BIF_α increased by 54% after the alum coagulation process in these four different waters. This indicated that THM speciations shifted in favor of the more brominated compounds. However, alum coagulation treatment process had less effect on HAA bromine incorporation factors (BIF_β)than it did on BIF_α. Bromine incorporation factor (BIF) values decreased with time in the THM and HAA formation processes, especially within the first 10 h of the reaction time. This suggested that brominated THMs or HAAs formed faster than the chlorinated species in the initial period.
机译：在控制氯化条件下，使用四个地表水评估了明矾凝结对消毒副产物（DBPs），三卤甲烷（THMs）和卤乙酸（HAA）分布的影响。在水中发现的9种HAA中，已发现二卤代乙酸（X_2AAs）是所有生水和明矾处理过的水中的主要物种。与二卤代乙酸（X_2AAs）相比，明矾凝结法倾向于去除更多的单卤代乙酸（XAAs）和三卤代乙酸（X_3AAs）前体。经明矾凝结处理的水与原水相比具有较低的HAA_9 / TTHM比。与原水相比，明矾处理水的THM溴结合因子（BIF_α）值增加具有统计学意义。在这四种不同的水中，经过明矾凝结后，BIF_α平均增加了54％。这表明THM形态向溴化程度更高的化合物转移。然而，明矾混凝处理过程对HAA溴结合因子（BIF_β）的影响小于对BIF_α的影响。在THM和HAA形成过程中，尤其是在反应时间的前10小时内，溴结合因子（BIF）值随时间降低。这表明在初始阶段，溴化THM或HAA的形成速度要快于氯化物。

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