Visible light plays a significant role during bacterial inactivation by the photo-fenton process, even at sub-critical light intensities

Mosteo, Rosa (Universidad de Zaragoza) ; Varon Lopez, A. ; Muzard, D. ; Benitez, N. ; Giannakis, S. ; Pulgarin, C.

Resumen: The aim of this research is to clarify the contribution of sunlight wavelengths, irradiance and Fe2+/H2O2 during bacterial disinfection by the photo-Fenton process in clear surface waters. We considered different solar spectrum distributions (visible, UVA-Visible), sub-critical irradiances (0–400 W/m2), focusing on the action modes of E. coli inactivation by the constituents involved in the composite process, at low µM reactants concentration (Fe2+/H2O2) in in ultrapure (MQ) water. We report that solar disinfection improved with Fenton reagents (photo-Fenton process) is a reality from very low light irradiance values (200 W/m2), and made possible even without the presence of UVA radiation, even when using low quantities of the Fenton reagents (0.5 mg/L Fe2+, 5 mg/L H2O2). Under light exposure, H2O2 was found to augment the intracellular Fenton process and Fe2+ to initiate further, distinct oxidative actions. Finally, validation was performed in Lake Geneva water over a wider irradiance range, where the photo-Fenton process was found to be reagent-dependent in low irradiance, shifting to light-driven in the higher values.

Idioma: Inglés

DOI: 10.1016/j.watres.2020.115636

Año: 2020

Publicado en: WATER RESEARCH 174 (2020), 115636 [14 pp.]
ISSN: 0043-1354

Factor impacto JCR: 11.236 (2020)

Categ. JCR: ENGINEERING, ENVIRONMENTAL rank: 3 / 53 = 0.057 (2020) - Q1 - T1
Categ. JCR: WATER RESOURCES rank: 2 / 97 = 0.021 (2020) - Q1 - T1
Categ. JCR: ENVIRONMENTAL SCIENCES rank: 6 / 273 = 0.022 (2020) - Q1 - T1

Factor impacto SCIMAGO: 3.099 - Civil and Structural Engineering (Q1) - Ecological Modeling (Q1) - Water Science and Technology (Q1) - Pollution (Q1) - Waste Management and Disposal (Q1) - Environmental Engineering (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA-FEDER/T51-17R
Financiación: info:eu-repo/grantAgreement/ES/MCIU/RYC2018-024033-I
Financiación: info:eu-repo/grantAgreement/ES/MICINN/PRX18/00107

Tipo y forma: Article (Published version)

Área (Departamento): Área Tecnologi. Medio Ambiente (Dpto. Ing.Quím.Tecnol.Med.Amb.)