Factors affecting the formation of nitrogenous disinfection by-products during chlorination of aspartic acid in drinking water

被引:36
作者
Chen, Wei [1 ]
Liu, Zhigang [1 ,2 ]
Tao, Hui [1 ]
Xu, Hang [1 ]
Gu, Yanmei [1 ]
Chen, Zhaolin [1 ]
Yu, Jingjing [2 ]
机构
[1] Hohai Univ, Coll Environm, Minist Educ, Key Lab Integrated Regulat & Resource Dev Shallow, 1 Xikang Rd, Nanjing 210098, Jiangsu, Peoples R China
[2] Ningbo Water Supply Co Ltd, 348 Xinhe Rd, Ningbo 315041, Zhejiang, Peoples R China
基金
美国国家科学基金会;
关键词
Drinking water; Dichloroacetonitrile; Chloropicrin; Dichloroacetamide; N-nitrosodimethylamine; Cyanogen chloride; CYANOGEN CHLORIDE FORMATION; N-NITROSODIMETHYLAMINE; ORGANIC-COMPOUNDS; PRECURSORS; NITROSAMINES; TRICHLORONITROMETHANE; DICHLOROACETONITRILE; HALOACETONITRILES; CHLOR(AM)INATION; MONOCHLORAMINE;
D O I
10.1016/j.scitotenv.2016.09.010
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The formation of emerging nitrogenous disinfection by-products (N-DBPs) from the chlorination of aspartic acid (Asp) was investigated. The yield of dichloroacetonitrile (DCAN) was higher than other N-DBPs, such as dichloroacetamide(DCAcAm) and chloropicrin (TCNM) during the chlorination of Asp. The formation of DCAN, DCAcAm, and TCNM all showed a trend of first increasing and then decreasing during the chlorination of Asp with increasing contact time. The dosage of chlorine had an impact on the formation of DCAN, DCAcAm, and TCNM. The highest yields of DCAN and DCAcAm appeared when the Cl-2/Asp molar ratio was about 20, the yield of TCNM increased with increasing the Cl-2/Asp molar ratio from 5 to 30 and TCNM was not produced when the ratio was less than 5. Cyanogen chloride (CNCl) was detected when the Cl-2/Asp molar ratio was lower than 5. N-DBPs formation was influenced by pH. DCAN formation increased with increasing pH from 5 to 6 and then decreased with increasing pH from 6 to 9, but DCAcAm and TCNM increased with increasing pH from 5 to 8 and then decreased. Higher temperatures reduced the formation of DCAN and DCAcAm, but increased TCNM formation. DCAN and DCAcAm formation decreased, and relatively stable TCNM formation increased, with increasing free chlorine contact time during chloramination. N-nitrosodimethylamine (NDMA) was produced during chloramination of Asp and increased with prolonged chloramination contact time. The presence of bromide ions enhanced the yields of haloacetonitriles and shifted N-DBPs to more brominated species. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:519 / 524
页数:6
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