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饮用水氯化消毒可以有效杀灭细菌,但同时会产生危害人体健康的消毒副产物(DBP).DBP生成机理研究是有效控制DBP的前提.溶解性有机氮(DON)是DBP的重要前体物,选取典型DON-丙氨酸(Ala)、苯丙氨酸(Phe)和酪氨酸(Tyr)作为氯仿(CF)等DBP的前体物,研究三种氨基酸(AA)的耗氯量和CF产率;同时考察了Tyr氯化中间产物2,4,6-TCP的氯化特性和CF产率;采用GC/MS扫描和前线轨道理论验证,探讨了CF的主要生成路径.研究发现,在同等氯化反应条件下,由于侧链基团的不同,Tyr的耗氯量以及CF产率都明显高于Ala和Phe,从而说明Tyr确实是一种重要的CF前体物质.CF的主要生成路径为Tyr→4-MCP→2,4-DCP→2,4,6-TCP→CF.氯胺消毒工艺可有效控制CF的生成,并能减少2,4,6-TCP的产生,但不能确保饮用水的生物安全性.氯化消毒之前将Tyr等重要前体物去除可能是控制CF等DBP更加有效的措施.
Chlorination of drinking water disinfection can effectively kill bacteria, but at the same time will have a negative impact on human health disinfection by-products (DBP) .DDBP generation mechanism is the premise of effective control of DBP.Dissolved organic nitrogen (DON) DBP is an important precursor The typical DON-alanine (Ala), phenylalanine (Phe) and tyrosine (Tyr) were selected as precursors for DBP such as chloroform (CF) to study the effects of three kinds of amino acids And the yield of CF. The chlorination characteristics and CF yield of 2,4,6-TCP, the intermediate product of Tyr, were also investigated. The main production routes of CF were discussed by GC / MS and frontier orbital theory. , Under the same chlorination conditions, due to the different side chain groups, the chlorine consumption of Tyr and the yield of CF were significantly higher than that of Ala and Phe, indicating that Tyr is indeed an important precursor of CF. CF The main route is Tyr → 4-MCP → 2,4-DCP → 2,4,6-TCP → CF. The chloramine disinfection process can effectively control the generation of CF and reduce the production of 2,4,6-TCP, But can not ensure the biosafety of drinking water.Chlorination before removal of important precursors such as Tyr may be more effective control of DBP such as CF measures.