Modeling the Transformation of Chromophoric Natural Organic Matter during Advanced Oxidation
Publication: Journal of Environmental Engineering
Volume 137, Issue 10
Abstract
This research developed a differential kinetic model to predict the partial degradation of natural organic matter (NOM) during ultraviolet plus hydrogen peroxide () advanced oxidation treatment. The absorbance of 254 nm UV, representing chromophoric NOM (CNOM) was used as a surrogate to track the degradation of NOM. To obtain reaction rate constants not available in the literature, i.e., reactions between the hydroxyl radical () and NOM, experiments were conducted with “synthetic” water, using isolated Suwannee River NOM, and parameter estimation was applied to obtain the unknown model parameters. The reaction rate constant for the reaction between and total organic carbon (TOC), , was estimated at , and the reaction rate constant between and CNOM, , was estimated at . The model was evaluated on two natural waters to predict the degradation of CNOM and during treatment. Model predictions of CNOM degradation agreed well with the experimental results for treatment of the natural waters, with errors up to 6%. For the natural water with additional alkalinity, the model also predicted well the slower degradation of CNOM during treatment, owing to scavenging of by carbonate species. The model, however, underpredicted the degradation of , suggesting that, when NOM is present, mechanisms besides the photolysis of contribute appreciably to degradation.
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Acknowledgments
The writers acknowledge Anaig Rosmorduc and Steve McDermid for assisting with experimental and analytical work. We thank Ted Mao, Mihaela Stefan, Bill Cairns, Alan Royce, Gustavo Imoberdorf, Esteban Duran, and Bhushan Gopaluni for all the valuable discussions. Natural Science and Engineering Research Council of Canada (NSERC) and Trojan Technologies are acknowledged for financial support.
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Published In
Journal of Environmental Engineering
Volume 137 • Issue 10 • October 2011
Pages: 903 - 912
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Mar 16, 2010
Accepted: Mar 8, 2011
Published online: Mar 10, 2011
Published in print: Oct 1, 2011
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