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Degradation of anti-inflammatory drugs in municipal wastewater by heterogeneous photocatalysis and electro-Fenton process

Villanueva Rodríguez, Minerva [autora] | Bello Mendoza, Ricardo [autor] | Hernández Ramírez, María Araceli [autora] | Ruiz Ruiz, Edgar J [autor].
Tipo de material: Artículo
 en línea Artículo en línea Tipo de contenido: Texto Tipo de medio: Computadora Tipo de portador: Recurso en líniaTema(s): Tratamiento de aguas residuales | Diclofenaco | Ibuprofeno | Naproxeno | Residuos de medicamentos | Fotocatálisis heterogénea | Sistema fotoelectro fenton | Contaminación del aguaTema(s) en inglés: Wastewater treatment | Diclofenac | Ibuprofen | Naproxen | Drug residues | Heterogeneous photocatalysis | Photoelectro fenton system | Water pollutionDescriptor(es) geográficos: Monterrey (Nuevo León, México) Nota de acceso: Disponible para usuarios de ECOSUR con su clave de acceso En: Environmental Technology. Volumen 40, número 18 (2019), páginas 2436-2445. --ISSN: 1479-487XNúmero de sistema: 60495Resumen:
Inglés

Non-steroidal anti-inflammatory drugs (NSAID) are compounds frequently found in municipal wastewater and their degradation by conventional wastewater treatment plants (WWTP) is generally incomplete. This study compared the efficiency of two advanced oxidation processes (AOP), namely heterogeneous photocatalysis (HP) and electro-Fenton (EF), in the degradation of a mixture of common NSAID (diclofenac, ibuprofen and naproxen) dissolved in either deionized water or effluent from a WWTP. Both processes were effective in degrading the NSAID mixture and the trend of degradation was as follows, diclofenac> naproxen> ibuprofen. EF with a current density of 40 mA cm−² and 0.3 mmol Fe²+ L−¹ was the most efficient process to mineralize the organic compounds, achieving up to 92% TOC removal in deionized water and 90% in the WWTP effluent after 3 h of reaction. HP with 1.4 g TiO2 L−¹ at pH 7 under sunlight, produced 85% TOC removal in deionized water and 39% in WWTP effluent also after 3 h treatment. The lower TOC removal efficiency shown by HP with the WWTP effluent was attributed mainly to the scavenging of reactive species by background organic matter in the wastewater. On the contrary, inorganic ions in the wastewater may produce oxidazing species during the EF process, which contributes to a higher degradation efficiency. EF is a promising option for the treatment of anti-inflammatory pharmaceuticals in municipal WWTP at competitive electrical energy efficiencies.

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Non-steroidal anti-inflammatory drugs (NSAID) are compounds frequently found in municipal wastewater and their degradation by conventional wastewater treatment plants (WWTP) is generally incomplete. This study compared the efficiency of two advanced oxidation processes (AOP), namely heterogeneous photocatalysis (HP) and electro-Fenton (EF), in the degradation of a mixture of common NSAID (diclofenac, ibuprofen and naproxen) dissolved in either deionized water or effluent from a WWTP. Both processes were effective in degrading the NSAID mixture and the trend of degradation was as follows, diclofenac> naproxen> ibuprofen. EF with a current density of 40 mA cm−² and 0.3 mmol Fe²+ L−¹ was the most efficient process to mineralize the organic compounds, achieving up to 92% TOC removal in deionized water and 90% in the WWTP effluent after 3 h of reaction. HP with 1.4 g TiO2 L−¹ at pH 7 under sunlight, produced 85% TOC removal in deionized water and 39% in WWTP effluent also after 3 h treatment. The lower TOC removal efficiency shown by HP with the WWTP effluent was attributed mainly to the scavenging of reactive species by background organic matter in the wastewater. On the contrary, inorganic ions in the wastewater may produce oxidazing species during the EF process, which contributes to a higher degradation efficiency. EF is a promising option for the treatment of anti-inflammatory pharmaceuticals in municipal WWTP at competitive electrical energy efficiencies. eng

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