Ozone and chlorine reactions with dissolved organic matter - Assessment of oxidant-reactive moieties by optical measurements and the electron donating capacities

Water Research
Linda ÖnnbyUrs von Gunten

Abstract

Oxidation processes are impacted by the type, concentration and reactivity of the dissolved organic matter (DOM). In this study, the reactions between various types of DOM (Suwannee River fulvic acid (SRFA), Nordic Reservoir NOM (NNOM) and Pony Lake fulvic acid (PLFA)) and two oxidants (ozone and chlorine) were studied in the pH range 2-9 by using a combination of optical measurements and electron donating capacities. The relationships between residual electron donating capacity (EDC) and residual absorbance showed a strong pH dependence for the ozone-DOM reactions with phenolic functional groups being the main reacting moieties. Relative EDC and absorbance abatements (UV254 or UV280) were similar at pH 2. At pH 7 or 9, the relative abatement of EDC was more pronounced than for absorbance, which could be explained by the formation of UV-absorbing products such as benzoquinone from the transformation of phenolic moieties. An increase in fluorescence abatement with increasing pH was also observed during ozonation. The increase in fluorescence quantum yields could not be attributed to formation of benzoquinone, but related to a faster abatement of phenolic moieties relative to fluorophores with low ozone reactivity. The overall •O...Continue Reading

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Citations

Mar 9, 2021·Chemical Reviews·Rachele OssolaKristopher McNeill
Apr 1, 2021·Environmental Science & Technology·Emanuel MüllerLenny H E Winkel
Dec 17, 2020·Environmental Science & Technology·Xianbing ZhangVirender K Sharma
Jul 23, 2020·Environmental Science & Technology·Christina K RemucalUrs von Gunten
Feb 23, 2020·Environmental Science & Technology·Juliana R LaszakovitsAllison A MacKay

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