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2023-04-11
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info:eu-repo/semantics/openAccess
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Resumen
According to the World Health Organization, antibiotic resistance is one of the main threats to global health. The excessive use of several antibiotics has led to the widespread distribution of antibiotic-resistant bacteria and antibiotic resistance genes in various environment matrices, including surface water. In this study, total coliforms, Escherichia coli and enterococci, as well as total coliforms and Escherichia coli resistant to ciprofloxacin, levofloxacin, ampicillin, streptomycin, and imipenem, were monitored in several surface water sampling events. A hybrid reactor was used to test the efficiency of membrane filtration, direct photolysis (using UV-C light emitting diodes that emit light at 265 nm and UV-C low pressure mercury lamps that emit light at 254 nm), and the combination of both processes to ensure the retention and inactivation of total coliforms and Escherichia coli as well as antibiotic-resistant bacteria (total coliforms and Escherichia coli) present in river water at occurrence levels. The membranes used (unmodified silicon carbide membranes and the same membrane modified with a photocatalytic layer) effectively retained the target bacteria. Direct photolysis using low-pressure mercury lamps and light-emitting diode panels (emitting at 265 nm) achieved extremely high levels of inactivation of the target bacteria. The combined treatment (unmodified and modified photocatalytic surfaces in combination with UV-C and UV-A light sources) successfully retained the bacteria and treated the feed after 1 h of treatment. The hybrid treatment proposed is a promising approach to use as point-of-use treatment by isolated populations or when conventional systems and electricity fail due to natural disasters or war. Furthermore, the effective treatment obtained when the combined system was used with UV-A light sources indicates that the process may be a promising approach to guarantee water disinfection using natural sunlight.
Descripción
The registered version of this article, first published in Membranes, 13(4), 425, is available online at the publisher's website: https://doi.org/10.3390/membranes13040425
La versión registrada de este artículo, publicado por primera vez en Membranes, 13(4), 425, está disponible en línea en el sitio web del editor: https://doi.org/10.3390/membranes13040425
This research was funded by Fundação para a Ciência e a Tecnologia through the grants PTDC/EAM-AMB/30989/2017 and CEECIND/02912/2018, the Associate Laboratory for Green Chemistry—LAQV (UIDB/50006/2020 and UIDP/50006/2020). iNOVA4Health (UIDB/04462/2020, UIDP/04462/2020) and LS4FUTURE Associated Laboratory (LA/P/0087/2020), a program financially supported by Fundação para a Ciência e Tecnologia/Ministério da Ciência, Tecnologia e Ensino Superior through national funds.
La versión registrada de este artículo, publicado por primera vez en Membranes, 13(4), 425, está disponible en línea en el sitio web del editor: https://doi.org/10.3390/membranes13040425
This research was funded by Fundação para a Ciência e a Tecnologia through the grants PTDC/EAM-AMB/30989/2017 and CEECIND/02912/2018, the Associate Laboratory for Green Chemistry—LAQV (UIDB/50006/2020 and UIDP/50006/2020). iNOVA4Health (UIDB/04462/2020, UIDP/04462/2020) and LS4FUTURE Associated Laboratory (LA/P/0087/2020), a program financially supported by Fundação para a Ciência e Tecnologia/Ministério da Ciência, Tecnologia e Ensino Superior through national funds.
Categorías UNESCO
Palabras clave
antibiotic-resistant bacteria, surface water treatment, membrane filtration, photolysis, photocatalytic membrane reactor
Citación
Sério, J., Marques, A. P., Huertas, R., Crespo, J. G., & Pereira, V. J. (2023). Occurrence and Treatment of Antibiotic-Resistant Bacteria Present in Surface Water. Membranes, 13(4). https://doi.org/10.3390/MEMBRANES13040425
Centro
Facultad de Ciencias
Departamento
Ciencias y Técnicas Fisicoquímicas