Changes in Dissolved Organic Matter Composition and Disinfection

Feb 20, 2018 - Mass peak intensities of less saturated CHO–DOM (positive (oxygen ... By Kendrick mass analysis, ozone reactions preferred less satur...
2 downloads 0 Views 1MB Size
Subscriber access provided by UNIV OF DURHAM

Article

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

Just Accepted “Just Accepted” manuscripts have been peer-reviewed and accepted for publication. They are posted online prior to technical editing, formatting for publication and author proofing. The American Chemical Society provides “Just Accepted” as a service to the research community to expedite the dissemination of scientific material as soon as possible after acceptance. “Just Accepted” manuscripts appear in full in PDF format accompanied by an HTML abstract. “Just Accepted” manuscripts have been fully peer reviewed, but should not be considered the official version of record. They are citable by the Digital Object Identifier (DOI®). “Just Accepted” is an optional service offered to authors. Therefore, the “Just Accepted” Web site may not include all articles that will be published in the journal. After a manuscript is technically edited and formatted, it will be removed from the “Just Accepted” Web site and published as an ASAP article. Note that technical editing may introduce minor changes to the manuscript text and/or graphics which could affect content, and all legal disclaimers and ethical guidelines that apply to the journal pertain. ACS cannot be held responsible for errors or consequences arising from the use of information contained in these “Just Accepted” manuscripts.

Environmental Science & Technology is published by the American Chemical Society. 1155 Sixteenth Street N.W., Washington, DC 20036 Published by American Chemical Society. Copyright © American Chemical Society. However, no copyright claim is made to original U.S. Government works, or works produced by employees of any Commonwealth realm Crown government in the course of their duties.

Page 1 of 32

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

1

ACS Paragon Plus Environment

Environmental Science & Technology

1

Changes in dissolved organic matter composition

2

and disinfection byproduct precursors in advanced

3

drinking water treatment processes

4

Phanwatt Phungsai†,‡,§, Futoshi Kurisu†,*, Ikuro Kasuga∥, and Hiroaki Furumai†

5



Research Center for Water Environment Technology, School of Engineering, The University of

6

7

Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan ‡

Department of Environmental Engineering, Faculty of Engineering and Research Center for

8

Environmental and Hazardous Substance Management, Khon Kaen University, Khon Kaen

9

40002, Thailand §

10

11 12

Page 2 of 32



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

13 14

KEYWORDS

15

Advanced water treatment, dissolved organic matter, Orbitrap mass spectrometry, unknown

16

disinfection byproducts, unknown screening analysis

ACS Paragon Plus Environment

1

Page 3 of 32

Environmental Science & Technology

17

ABSTRACT

18

Molecular changes in dissolved organic matter (DOM) from treatment processes at two drinking

19

water treatment plants in Japan were investigated using unknown screening analysis by Orbitrap

20

mass spectrometry. DOM formulae with carbon, hydrogen and oxygen (CHO-DOM) were the

21

most abundant class in water samples, and over half of them were commonly found at both

22

plants. Among the treatment processes, ozonation induced the most drastic changes to DOM.

23

Mass peak intensities of less saturated CHO-DOM (positive (oxygen subtracted double bond

24

equivalent per carbon (DBE–O)/C)) decreased by ozonation, while more saturated oxidation

25

byproducts (negative (DBE–O)/C) increased and new oxidation byproducts (OBPs) were

26

detected. By Kendrick mass analysis, ozone reactions preferred less saturated CHO-DOM in the

27

same alkylation families and produced more saturated alkylation families of OBPs. Following

28

ozonation, biological activated carbon filtration effectively removed