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Changes in dissolved organic matter composition and disinfection byproduct precursors in advanced drinking water treatment processes Phanwatt Phungsai, Futoshi Kurisu, Ikuro Kasuga, and Hiroaki Furumai Environ. Sci. Technol., Just Accepted Manuscript • DOI: 10.1021/acs.est.7b04765 • Publication Date (Web): 20 Feb 2018 Downloaded from http://pubs.acs.org on February 20, 2018
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Environmental Science & Technology
River water intake S
Coagulation
Unchanged Increased
Decreased Newly formed
Coagulation
S
Ozonation Ozonation
S
BAC
S
Chlorination
S
BAC Orbitrap MS
Chlorination 0 250 500 750 1000 Number of CHO formulae changed by treatment processes
Graphical Abstract
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ACS Paragon Plus Environment
Environmental Science & Technology
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Changes in dissolved organic matter composition
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and disinfection byproduct precursors in advanced
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drinking water treatment processes
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Phanwatt Phungsai†,‡,§, Futoshi Kurisu†,*, Ikuro Kasuga∥, and Hiroaki Furumai†
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†
Research Center for Water Environment Technology, School of Engineering, The University of
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Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan ‡
Department of Environmental Engineering, Faculty of Engineering and Research Center for
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Environmental and Hazardous Substance Management, Khon Kaen University, Khon Kaen
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40002, Thailand §
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∥
Center of Excellence on Hazardous Substance Management, Bangkok 10330, Thailand
Department of Urban Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan
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KEYWORDS
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Advanced water treatment, dissolved organic matter, Orbitrap mass spectrometry, unknown
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disinfection byproducts, unknown screening analysis
ACS Paragon Plus Environment
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Environmental Science & Technology
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ABSTRACT
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Molecular changes in dissolved organic matter (DOM) from treatment processes at two drinking
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water treatment plants in Japan were investigated using unknown screening analysis by Orbitrap
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mass spectrometry. DOM formulae with carbon, hydrogen and oxygen (CHO-DOM) were the
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most abundant class in water samples, and over half of them were commonly found at both
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plants. Among the treatment processes, ozonation induced the most drastic changes to DOM.
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Mass peak intensities of less saturated CHO-DOM (positive (oxygen subtracted double bond
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equivalent per carbon (DBE–O)/C)) decreased by ozonation, while more saturated oxidation
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byproducts (negative (DBE–O)/C) increased and new oxidation byproducts (OBPs) were
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detected. By Kendrick mass analysis, ozone reactions preferred less saturated CHO-DOM in the
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same alkylation families and produced more saturated alkylation families of OBPs. Following
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ozonation, biological activated carbon filtration effectively removed
