氯消毒过程中水中色氨酸产生THMs和HAAs的特征研究

以氨基酸为代表的溶解性含氮有机物在水源水中广泛存在，成为制水工艺消毒副产物的主要前体物之一.选取色氨酸（Trp）为含氮前体物模型，考察了其在消毒工艺中产生受控消毒副产物的途径及影响因素.结果表明，Trp氯化过程经取代，脱羧，水解等一系列反应，可生成卤乙酸（HAAs），三卤甲烷（THMs）等消毒副产物.THMs和HAAs的生成量随加氯量增加；随接触时间的延长逐渐增加.温度的升高，HAAs的生成量先增大后减少；碱性条件有利于THMs和HAAs的生成.氯胺消毒和遮光条件下可明显减少THMs和HAAs的产生.

Generation characteristics of THMs and HAAs during tryptophan chlorination in aqueous system

The occurrence of dissolved nitrogenous organic compounds represented by amino acids (AAs) is ubiquitous in aqueous system, especially in water source. AAs were reported to be the precursors of disinfection by-products during water production processes. In this paper, tryptophan (Try) was selected as a model nitrogenous precursor to investigate the generating pathway and influencing factors of the regulated disinfection by-products trichloromethanes (THMs) and haloacetic acids (HAAs) during chlorination process. The results showed that Trp can generate HAAs and THMs through a series reactions including substitution, decarboxylation and hydrolysis. The formation of THMs and HAAs increased gradually as chlorination time and chlorine dosage increased; With the increase of temperature, the amount of HAAs increased first and then decreased; Alkaline promoted the production of THMs and HAAs; Chloramine and shading condition remarkably inhabited the production of general disinfectionby-products.