期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 673, 期 -, 页码 435-444出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2019.03.309
关键词
Dissolved organic nitrogen (DON); Drinking water supply; Nitrogenous disinfection by-product (N-DBP); N-nitrosamines; Chlorine-containing dissolved organic nitrogen (Cl-DON)
资金
- Key Program of the National Natural Science Foundation of China [51438006]
- National Natural Science Foundation of China [51578209]
- Fundamental Research Funds for the Central Universities [2018B53314]
- National Major Water Projects [2017ZX07201002]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- State Key Laboratory of Heavy Oil Processing
The transformation of dissolved organic nitrogen (DON) in the drinking water treatment plants could be closely associated with nitrogenous disinfection by-product (N-DBP) formation. In this study, we have assessed the molecular transformation of DON and its impact on N-DBP formation in a full scale drinking water treatment plant. Based on the result of Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) analysis, DON compounds with low molecular weight (<.1 kDa) were classified as CHON, CHON2 and CHON3 according to the number of nitrogen atoms. Via the analytical window of van Krevelen diagrams, we found that the molecular structural features of CHON, CHON2 and CHON, were not altered before the chlorination process. In detail, the CHON2 and CHON5 compositions were concentrated on the regions assigned to a lignin-structure while CHON compositions were also distributed in other compounds including proteins, carbohydrates and tannin. Furthermore, CHON formation was more difficult to be removed before the V-filter process. For N-DBP, chlorine-containing DON (CI-DON) composition was likely to be removed through flocculation and sedimentation processes, whereas N-nitrosamine compounds were removed in V-filter and biological activated carbon filter processes. The health risks of aromatic structure Nnitrosamines due to the pre-chlorination of the raw water should be further studied. (C) 2019 Published by Elsevier B.V.
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