期刊
CHEMICAL ENGINEERING JOURNAL
卷 426, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.131916
关键词
High-resolution mass spectrometry; Natural organic matter; MFAssignR; Disinfection byproducts; UV; chlorination
资金
- National Natural Science Founda-tion of China [52022049/51978370]
- Shenzhen Science, Technology, and Innovation Commission [JCYJ20200109142829123]
- Department of Chemistry, Michigan Technological University
This study utilized high resolution mass spectrometry to investigate the impact of UV irradiation, chlorination, and UV/chlorination on NOM transformation and DBP formation. It was found that chlorination and UV/chlorination had a greater influence on NOM molecular composition compared to UV irradiation, and UV/chlorination formed more saturated DBPs than chlorination.
The ultraviolet (UV)/chlorination process provides an emerging strategy to disinfect and remove trace organic contaminants in drinking water and wastewater treatment plants. Different strategies for UV irradiation, chlorination, and UV/chlorination affect the characteristics of natural organic matter (NOM) and the formation of disinfection by-products (DBPs). The underlying effect remains poorly understood. In this work, Orbitrap-high resolution mass spectrometry, with a high accuracy for mass identification and a low cost, was used to investigate NOM transformation and DBP formation with UV irradiation, chlorination, and UV/chlorination. Of the untreated and treated (UV irradiation, chlorination, and UV/chlorination) NOM sample, most identified compounds were phenolic and highly unsaturated aliphatic compounds. Compared with UV irradiation, chlorination, and UV/chlorination had a stronger effect on the transformation of NOM molecular composition and resulted in more oxidized groups. A comparison of UV/chlorination with chlorination showed that UV/chlorination formed less nitrogen-containing Cl-containing DBPs, and more oxidized and saturated Cl-containing DBPs. After chlorination and UV/chlorination, more than 60% of the identified DBPs could track their precursors on the basis of electrophilic substitution and addition reactions. The UV/chlorination precursors were more saturated than for chlorination. This systematic investigation is expected to guide the future advanced development of water treatment strategies and provide a method to auto-analysis of mass spectra data and visualize the DBP character.
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