Department of Civil and Environmental Engineering, South Dakota State University, Brookings, SD 57007, USA.
Water Res. 2013 Sep 1;47(13):4322-30. doi: 10.1016/j.watres.2013.04.057. Epub 2013 May 14.
The objective of this study was to quantitatively evaluate the effect of pre-ozonation on the formation and speciation of disinfection byproducts (DBPs) from subsequent chlorination and chloramination. Laboratory experiments were conducted on six diverse natural waters with low to medium bromide concentrations. Four groups of DBPs were investigated in this study: trihalomethanes (THMs), trihaloacetic acids (THAAs), dihaloacetic acids (DHAAs), and dihaloacetonitriles (DHANs). The results showed that the relative destructions of chlorination DBP precursors by ozone generally follow the order of DHANs > THMs & THAAs > DHAAs. Pre-ozonation substantially increased the DHAA precursors in the waters with low specific ultraviolet absorbance values. Pre-ozonation shifted the formation of DBPs to more brominated species. The bromine substitution factors (BSF) of different chlorination DBPs typically increased by 1-8 percentage points after ozonation. Pre-ozonation reduced the yields of chloramination DHAAs and THMs and increased the BSFs of chloramination DHAAs by 1-6 percentage points.
本研究的目的是定量评估预臭氧化对后续氯化和氯胺化过程中消毒副产物（DBPs）形成和形态的影响。在溴化物浓度低至中等的六种不同天然水中进行了实验室实验。本研究考察了四组 DBPs：三卤甲烷（THMs）、三卤乙酸（THAAs）、二卤乙酸（DHAAs）和二卤乙腈（DHANs）。结果表明，臭氧对氯化 DBPs 前体的相对破坏通常遵循以下顺序：DHANs > THMs & THAAs > DHAAs。预臭氧化会显著增加低特定紫外吸收值水中的 DHAA 前体。预臭氧化会使 DBPs 的形成向更多的溴化物种转移。不同氯化 DBPs 的溴取代因子（BSF）通常在臭氧化后增加 1-8 个百分点。预臭氧化会降低氯胺化 DHAAs 和 THMs 的产率，并使氯胺化 DHAAs 的 BSF 增加 1-6 个百分点。
