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Título
UVA-LED technology’s treatment efficiency and cost in a competitive trial applied to the photo-fenton treatment of landfill leachate
Autor
Año del Documento
2021
Editorial
MDPI
Descripción
Producción Científica
Documento Fuente
Processes, 2021, Vol. 9, Nº. 6, 1026
Abstract
The objective of this trial was to assess the application of UVA-LED technology as an alternative source of irradiation for photo-Fenton processes, aiming to reduce treatment costs and provide a feasible treatment for landfill leachate. An optimized combination of coagulation with ferric chloride followed by photo-Fenton treatment of landfill leachate was optimized. Three different radiation sources were tested, namely, two conventional high-pressure mercury-vapor immersion lamps (100 W and 450 W) and a custom-designed 8 W 365 nm UVA-LED lamp. The proposed treatment combination resulted in very efficient degradation of landfill leachate (COD removal = 90%). The coagulation pre-treatment removed about 70% of the COD and provided the necessary amount of iron for the subsequent photo-Fenton treatment, and it further favored this process by acidifying the solution to an optimum initial pH of 2.8. The 90% removal of color improved the penetration of radiation into the medium and by extension improved treatment efficiency. The faster the Fenton reactions were, as determined by the stoichiometric optimum set-up reaction condition of [H2O2]0/COD0 = 2.125, the better were the treatment results in terms of COD removal and biodegradability enhancement because the chances to scavenge oxidant agents were limited. The 100 W lamp was the least efficient one in terms of final effluent quality and operational cost figures. UVA-LED technology, assessed as the application of an 8 W 365 nm lamp, provided competitive results in terms of COD removal, biodegradability enhancement, and operational costs (35–55%) when compared to the performance of the 450 W conventional lamp.
Materias (normalizadas)
Sewage - Purification
Water - Purification
Aguas residuales - Depuración y tratamiento
Tratamiento de aguas
Residuos - Tratamiento
Materias Unesco
3308.10 Tecnología de Aguas Residuales
Palabras Clave
Coagulation pre-treatment
Pretratamiento de coagulación
Landfill leachate
Lixiviados de vertedero
Photo-Fenton
ISSN
2227-9717
Revisión por pares
SI
Patrocinador
Ministerio de Economía, Industria y Competitividad - (project CTM2016- 77948-R)
Comunidad Autónoma de Madrid - (project S2018/EMT-4459)
Comunidad Autónoma de Madrid - (project S2018/EMT-4459)
Version del Editor
Propietario de los Derechos
© 2021 The authors
Idioma
eng
Tipo de versión
info:eu-repo/semantics/publishedVersion
Derechos
openAccess
Collections
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