Molecular characterization of disinfection byproduct precursors in filter backwash water from 10 drinking water treatment plants
Molecular characterization of disinfection byproduct precursors in filter backwash water from 10 drinking water treatment plants
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10 个饮用水处理厂过滤器反冲洗水中消毒副产物前体的分子表征
DOI：
10.1016/j.scitotenv.2022.159027
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发表时间：
2023
影响因子：
9.8
通讯作者：
An, Dong
中科院分区：
文献类型：
--
作者：
Qian, Yunkun;Shi, Yijun;Guo, Jun;Chen, Yanan;Hanigan, David;An, Dong
有机物与氯反应形成消毒副产物（DBPs），包括三卤甲烷（THMs）、卤乙酰胺（HAMs）、卤乙酸（HAAs）和卤乙腈（HANs）。过滤反冲洗水（FBW）在固体沉淀后被释放回环境或再循环到处理厂的头部，剩余的溶解有机物是DBP前体的重要池，尚未得到很好的理解。我们分析了10个处理厂的垃圾粪便中溶解的有机物，其中低分子量（MW < 1 kDa）的有机物对DBP的形成贡献最大。我们通过傅里叶变换离子回旋共振质谱法证明了10个FBW样品的分子组成（例如元素比，m/z， DBE）的总体相似性。芳香族和高度氧化的化合物优先与氯反应，形成dbp。低分子量（<450 Da）脂肪族化合物、高不饱和化合物和酚类化合物是THMs、HANs和HAMs的主要前体，这些DBPs的形成势（FPs）与多个单独的分子式相关。HAA FPs与低分子量、高不饱和和酚类化合物相关。这些对FBW中DBP前体分子组成的研究进展可能为控制DBP的形成和限制对成品水质量的影响制定有效的策略，并可扩展到了解饮用水水源中的DBP前体。
Organic matter reacts with chlorine forming disinfection byproducts (DBPs) including trihalomethanes (THMs), haloacetamides (HAMs), haloacetic acids (HAAs), and haloacetonitriles (HANs). Filter backwash water (FBW) is either released back to the environment or recycled to the head of the treatment plant after solids settling and the remaining dissolved organic matter is a significant pool of DBP precursors that are not well understood. We characterized dissolved organic matter in FBW from 10 treatment plants and low molecular weight (MW < 1 kDa) organic matter contributed the most to DBP formation. We demonstrated overall similarity of the molecular composition (e.g., elemental ratios,m/z, DBE) of the 10 samples of FBW by Fourier transform ion cyclotron resonance mass spectrometry. Aromatic and more highly oxidized compounds preferentially reacted with chlorine, forming DBPs. Low MW (<450 Da) aliphatic compounds, and highly unsaturated and phenolic compounds were the primary precursors of THMs, HANs, and HAMs, and the formation potentials (FPs) of these groups of DBPs were correlated with multiple individual molecular formulae. HAA FPs were correlated with low MW, highly unsaturated and phenolic compounds. These advances in the understanding of the molecular composition of DBP precursors in FBW may develop the effective strategies to control DBP formation and limit impacts on the quality of finished water, and can be expanded to understanding DBP precursors in drinking water sources.