Effects of ozone pretreatment on the formation of disinfection by-products and its associated bromine substitution factors upon chlorination/chloramination of Tai Lake water.
Effects of ozone pretreatment on the formation of disinfection by-products and its associated bromine substitution factors upon chlorination/chloramination of Tai Lake water.
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DOI：
10.1016/j.scitotenv.2013.12.094
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发表时间：
2014-03
期刊：
影响因子：
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通讯作者：
F. Wang;Mengyong Ruan;Hongjun Lin;Yu Zhang;H. Hong;Xiaoling Zhou
中科院分区：
文献类型：
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作者：
F. Wang;Mengyong Ruan;Hongjun Lin;Yu Zhang;H. Hong;Xiaoling Zhou
研究了臭氧预氧化对太湖水氯化和氯胺化过程中消毒副产物（DBPs）生成的影响。结果表明，高臭氧剂量（0.6- 1.0mgO_3/mgDOC）预处理降低了三卤乙酸的产率（氯化减少62-63%），二卤代乙腈（氯化和氯胺化分别减少53-55%和14-26%）和三卤甲烷（氯胺化减少19%），但显著增加卤代硝基甲烷的形成（氯化增加4.7-5.6倍，氯胺化增加2.1-2.7倍），卤代酮（氯化增加4.8-7.1倍，氯胺化增加2.5-2.9倍）和二卤乙酸（氯化提高1.5-2.4倍，氯胺化提高0.3-0.6倍）。因此，在太湖水氯化/氯胺化过程中应避免高剂量臭氧预处理。此外，氯胺化（有和没有预臭氧化）产生的消毒副产物的产量低得多相比，氯化（有和没有预臭氧化），表明氯胺是一个更好的选择，以控制消毒副产物的产量。进一步的分析还表明，消毒副产物的溴取代因子（BSFs）随消毒方式的不同而不同。在氯胺化过程中，BSFs随臭氧投加量的增加总体呈下降趋势，而在氯化过程中，BSFs多呈先增加后下降的趋势。此外，消毒副产物在氯胺化（有或没有预臭氧化）的生物安全系数显着低于那些在氯化（有或没有预臭氧化）。
This study investigated the effects of preozonation on disinfection by-products (DBPs) formation during chlorination and chloramination of the water collected from Tai Lake. Results showed that the high ozone dose (0.6–1.0 mg O3/mg DOC) pretreatment reduced the yields of trihaloacetic acids (reduced 62–63% in chlorination), dihaloacetonitriles (reduced 53–55% and 14–26% in chlorination and chloramination, respectively) and trihaomethanes (reduced 19% in chloramination), but markedly increased the formation of halonitromethanes (increased 4.7–5.6 times in chlorination and 2.1–2.7 times in chloramination), haloketones (increased 4.8–7.1 times in chlorination and 2.5–2.9 times in chloramination) and dihaloacetic acids (increased 1.5–2.4 times in chlorination and 0.3–0.6 times in chloramination). Thus the high ozone dose pretreatment should be avoided during chlorination/chloramination of Tai Lake water. Also, chloramination (with and without preozonation) produced much lower DBPs yields as compared with chlorination (with and without preozonation), indicating that chloramine was a better choice to control the DBPs yields. Further analysis also revealed that the bromine substitution factors (BSFs) of DBPs varied with disinfection mode. In chlorinamination, the BSFs generally showed a decrease trend with the ozone dose, yet in chlorination, the BSFs mostly exhibited first an increase and then a decrease trend. Moreover, the BSFs of DBPs in chloramination (with or without preozonation) were dominantly lower than those in chlorination (with or without preozonation).