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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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Removal of herbicide 2,4-D using constructed wetlands at pilot scale

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Emerging Contaminants 2019年第1期5卷 303-307页

作者： Andres Felipe Echeverri Gonzalez Henry Zúniga-Benítez gustavo a.penuela Grupo GDCON Facultad de IngenieríaSede de Investigacion Universitaria(SIU)Universidad de Antioquia UdeACalle 70#52-21MedellínColombia Departamento de Ingeniería Química Facultad de IngenieríaUniversidad de Antioquia UdeACalle 70#52-21MedellínColombia

Herbicide 2,4-D is one of the most widely used in the *** this way,its presence on different bodies of water has been *** this paper the efficiency of horizontal-subsurface flow constructedwetlands for 2,4-D removal in aqueous solutions was *** were constructed using fiberglass,and grown with Phragmites *** influent consisted of synthetic wastewater under different 2,4-D and glucose initial *** indicated that,under the evaluated experimental conditions,2,4-D extent of removal was between 71.0 and 99.0%.In general,it can be noted that an increase in the herbicide concentration reduces the removal efficiency,probably due to a toxic effect on the biological *** the other hand,the influent dissolved organic carbon(DOC)initial concentration had a significant effect on the removal of both,the herbicide and the organic matter content in the system,demonstrating that this parameter has a significant effect on this kind of biological methods for water ***,it can be concluded that constructed wetlands are a viable alternative for the treatment of wastewater contaminated with the herbicide 2,4-D.

关键词： 2,4-D Constructed wetlands Herbicides Phragmites australis Wastewater treatment

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Use of simulated sunlight radiation and hydrogen peroxide in azithromycin removal from aqueous solutions:Optimization&mineralization analysis

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Emerging Contaminants 2020年第1期6卷 53-61页

作者： Pablo Andres Cano Marcela Jaramillo-Baquero Henry Zúniga-Benítez Yudy A.Londono gustavo a.penuela Facultad de Ingeniería Tecnologico de Antioquia Institucion UniversitariaCalle 78B#72A-220MedellínColombia Departamento de Ingeniería Química Facultad de IngenieríaUniversidad de Antioquia UdeACalle 70#52-21MedellínColombia Grupo GDCON Facultad de IngenieríaSede de Investigacion Universitaria(SIU)Universidad de Antioquia UdeACalle 70#52-21MedellínColombia

Azithromycin(AZT)is a broad-spectrum antibiotic from the group of macrolides that acts against several Gram-positive and Gram-negative bacteria,which has promoted its use in the treatment of different respiratory and sexually transmitted ***,its presence in environmental matrices and in the effluents of conventional wastewater treatment plants has been evidenced in recent years,which reflects the need to develop new treatment alternatives that allow its total removal and minimize the eventual adverse effects,selection of resistant bacterial strains,associated with its presence in water *** sunlight radiation and H2O2 were used to remove AZT from water assessing the effects of operational parameters like the solution initial pH and the peroxide *** indicate that hydroxyl free radical is the main responsible for pollutant removal but acidic solution conditions and larger H2O2 doses negatively affect OHgeneration under the evaluated experimental *** removal was almost complete after 120 min of *** addition,reduction of the organic carbon content in the treated samples was^50.0%;and a significant increase of nitrates concentration in solution was evidenced.

关键词： Advanced oxidation Antibiotics Azithromycin Hydrogen peroxide Sunlight Wastewater treatment

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