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Photolysis of a mixture of anthracene and benzo[a] pyrene at ultra-trace levels in natural water with disinfection purposes

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Journal of Environmental Sciences 2020年第6期32卷 79-94页

作者： Ainhoa Rubio-Clemente edwin chica Gustavo A.Penuela Facultad de Ciencias de La Salud.Universidad Catolica de Murcia(UCAM) Murcia 30107Spain Grupo GDCON Facultad de IngenieriaSede de Investigaciones Universitarias(SIU)Universidad de Antioquia(UdeA)Medellín 050010Colombia Facultad de Ingenieria Tecnologico de Antioquia-Institucion Universitaria(TdeA)Medellín 050034Colombia Departamento de Ingenieria Mecanica Facultad de IngenieriaUniversidad de Antioquia(UdeA)Medellín 050010Colombia

The photodegradation of anthracene(AN)and benzo[a]pyrene(BaP),two priority polycyclic aromatic hydrocarbons(PAHs),was examined at ultra-trace levels in surface water to elucidate their behaviour under several irradiance values and types of *** emitting flux and the spectrum of the lamps were found to develop a crucial role in AN and BaP degradation since removal efficiencies of the target contaminants higher than 99%were found after 15 min of irradiation under an ultraviolet C(UVC)irradiance of 0.63 mW/cm^2,corresponding to a fluence of 560.25 mJ/cm^*** the other hand,although ultraviolet A(UVA)lamps exhibited a higher irradiance compared to that of UVC lamps,they were not efficient for degrading the target *** removal kinetic studies corroborated these findings,being the AN elimination rate in surface water higher than that in deionized water at optimal operating *** potential was also measured.A rapid microbial load inactivation,in terms of total coliforms naturally contained in the water matrix studied,was evidenced within 15 min of treatment for the fluence ***,after 24 hr in the dark,a regrowth was ***,photolysis products more toxic than the parent compounds were found,which were not removed even by extending the treatment *** this regard,it can be concluded that the individual action of UVC light for removing AN and BaP with disinfection purposes is not an efficient treatment;therefore,the use of radiation in combination with other kinds of treatments is required.

关键词： Polycyclic aromatic hydrocarbon Photolysis Matrix constituent Intermediate product Disinfection Regrowth

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