Generation characteristics of THMs and HAAs during tryptophan chlorination in aqueous system
CHEN Dan-wen1,2, HUANG Fu1, ZHU Shi-cui1, YU Qi1, YU Jian-quan1, LI Xiao-min3, MA Xiao-yan1
1. Municipal Engineering of Architecture Engineering College, Zhejiang University of Technology, Hangzhou 310014, China;
2. College of Environment, Hohai University, Nanjing 210098, China;
3. Hangzhou Station, National Water Supply Network Water Quality Monitoring Station, Hangzhou 310014, China
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.
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