期刊
WATER RESEARCH
卷 47, 期 5, 页码 1773-1782出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2012.12.035
关键词
Disinfection byproducts; Halo-benzoquinones; Drinking water; Coagulation; Liquid chromatography-Organic carbon detection; Natural organic matter
资金
- Canadian Water Network
- Alberta Health and Wellness
- Natural Sciences and Engineering Research Council of Canada (NSERC) Chair in Drinking Water Treatment
- University of Alberta
- Ontario Graduate Scholarship
- NSERC CGS-M
Halo-benzoquinones (HBQs) have been previously detected as disinfection by-products in chlorinated drinking water. The current work investigates the link between natural organic matter (NOM) characteristics and HBQ formation during bench-scale coagulation of raw water. Three source waters (Lake Ontario, Otonabee River and Grand River) were subjected to jar testing using alum followed by chlorination. NOM fractions were analyzed via liquid chromatography organic carbon detection (LC-OCD), while HBQs were quantified using liquid chromatography triple quadrupole mass spectrometry. One HBQ, 2,6-dichloro-(1,4) benzoquinone (2,6-DCBQ), was identified in all waters after chlorination, and appeared to decrease with increased applied alum dose. 2,6-DCBQ exhibited high correlations with some humic NOM indicators: humic substance concentration (in Grand and Otonabee River waters only), UV absorbance at 254 nm, UV absorbance at 254 nm of the humic peak, and specific UV absorbance of humics (humic SUVA). With data pooled from the three waters, the biopolymer fraction of NOM was most strongly correlated with 2,6-DCBQ formation (R-2 = 0.78, p < 0.001); this may be due to co-removal of biopolymers with HBQ precursors during coagulation. These results indicate that coagulation processes can be effective for reduction, but not elimination, of HBQ precursors. (C) 2013 Elsevier Ltd. All rights reserved.
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