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Formation characteristics and acute toxicity assessment of THMs and HAcAms from DOM and its different fractions in source water during chlorination and chloramination

氯胺化 化学 溶解有机碳 环境化学 急性毒性 氯胺 有机质 水处理 天然有机质 毒性 有机化学 环境工程 环境科学
作者
Litong Cai,Huahan Huang,Qingsong Li,Jing Deng,Xiaoyan Ma,Jing Zou,Guoxin Li,Guoyuan Chen
出处
期刊:Chemosphere [Elsevier]
卷期号:329: 138696-138696 被引量:8
标识
DOI:10.1016/j.chemosphere.2023.138696
摘要

The formation characteristics of trihalomethanes (THMs) and haloacetamides (HAcAms) from dissolved organic matter and its fractions were investigated during chlorine-based disinfection processes. The relationships between water quality parameters, fluorescence parameters, and the formation levels of THMs and HAcAms were analyzed. The fractions contributing most to the acute toxicity were identified. The trichloromethane (TCM) generation level (72 h) generally followed the order of Cl2 > NH2Cl > NHCl2 process. The NHCl2 process was superior to the NH2Cl process in controlling TCM formation. Hydrophobic acidic substance (HOA), hydrophobic neutral substance (HON), and hydrophilic substance (HIS) were identified as primary precursors of 2,2-dichloroacetamide and trichloroacetamide during chlorination and chloramination. The formation of TCM mainly resulted from HOA, HON and HIS fractions relatively uniformly, while HOA and HIS fractions contributed more to the formation of bromodichloromethane and dibromomonochloromethane. UV254 could be used as an alternative indicator for the amount of ΣTHMs formed during chlorination and chloramination processes. Dissolved organic nitrogen was a potential precursor of 2,2-dichloroacetamide during chlorination process. The fractions with the highest potential acute toxicity after the chlorination were water-dependent.

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