Abstract
AbstractAqueous chlorine (Cl2, OCl−, Cl−) 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 OCl− (Amax 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...
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