Alternative View of Chlorine Oxidation Stimulated by Longer Wavelength Light
Publication: Journal of Environmental Engineering
Volume 142, Issue 10
Abstract
Aqueous chlorine (, , ) in combination with longer wavelength ultraviolet (UV) irradiation has been investigated as a potential advanced oxidation process (AOP) for water and wastewater treatment. The cases include bleaching of organic matter (NOM) and oil sands tailing pond water (OSPW) under sunlight irradiation. Surprisingly, low energy tail of ( at 290 nm) has been postulated to be responsible for degradation of organic components. An alternative photoreaction, potentially more photon efficient, postulates absorption by strongly absorbing chromophores of target compounds present in water, which then undergo reaction in their excited states. This alternate hypothesis was tested in the current study under 440 nm light-emitting diode (LED) irradiation, where chlorine species have no absorption, using Swannee River fulvic acid (SRFA), an oil sands process water, and by bleaching of a coumarin dye. All results show substantial enhancement of hypochlorite oxidation processes under irradiation of the various complex mixtures of organic chromophores at 440 nm, where chlorine species offer no measurable absorbance that can compete with the organic chromophores in the complex mixtures. In the fulvic acid case, a known long-lived triplet excited state is a plausible active species that may be a contributor.
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Acknowledgments
We thank the Natural Sciences and Engineering Research Council of Canada (NSERC) for their financial support of this work.
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Information & Authors
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Published In
Journal of Environmental Engineering
Volume 142 • Issue 10 • October 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Nov 23, 2015
Accepted: Jan 26, 2016
Published online: Apr 22, 2016
Discussion open until: Sep 22, 2016
Published in print: Oct 1, 2016
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