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Selective removal o...
Selective removal of dissolved organic matter affects the production and speciation of disinfection byproducts
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- Williams, Clayton J. (författare)
- Rubenstein School of Environment and Natural Resources, The University of Vermont, Burlington, VT 05405, USA
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- Conrad, Dan (författare)
- Buffalo Pound Water Treatment Plant, P.O. Box 1790, Regina, SK S4P 3C8, Canada
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- Kothawala, Dolly (författare)
- Uppsala universitet,Limnologi
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- Baulch, Helen M. (författare)
- Univ Saskatchewan, Global Inst Water Secur, Sch Environm & Sustainabil, 11 Innovat Blvd, Saskatoon, SK S7N 3H5, Canada
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Rubenstein School of Environment and Natural Resources, The University of Vermont, Burlington, VT 05405, USA Buffalo Pound Water Treatment Plant, PO. Box 1790, Regina, SK S4P 3C8, Canada (creator_code:org_t)
- 2019
- 2019
- Engelska.
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Ingår i: Science of the Total Environment. - 0048-9697 .- 1879-1026. ; 652, s. 75-84
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
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- The heterogeneity of dissolved organic matter (DOM) in natural and human impacted waters and the variety of drinking water treatment processes employed has made a mechanistic understanding of disinfection byproduct (DBP) formation challenging. In this study, we examined the formation of the regulated DBPs (Trichloromethanes, THM, and Haloacetic acids, HAA) during full-scale water treatment operations both with prechlorination treatment (normal operations for the drinking water plant) and without (altered operations); followed by coagulation, flocculation, filtration, and chlorination. The source water DOM concentration ranged 6.4 to 7.3 mg-C/L. DOM composition was moderately humic and degraded with a mix of microbial- and terrestrial-like characteristics. Removal of raw water prechlorination caused an average reduction in total THM and HAA concentrations of 52.7% and 40.0%, respectively, with the greater reduction noted for chlorinated-DBPs rather than brominated-DBPs. Prechlorination treatment resulted in a higher relative production of Cl3CH and BrCl2CH associated with aromatic, humic, and terrestrial-like DOM. Without prechlorination, the DBP pool had higher proportions of brominated-DBPs (Br3CH, Br2ClCH, Br2CHCOOH, BrClCHCOOH, and BrCH2COOH) associated with microbial-like, processed humic-like, and protein-like DOM. These observed patterns could not be explained by chloride demand and DOM concentration, indicating that DOM composition played an important role in DBP formation.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Environmental Sciences (hsv//eng)
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