Mosteo, RosaVaron Lopez, AngelicaMuzard, DavidBenitez, NorbertoGiannakis, StefanosPulgarin, Cesar2020-04-222020-04-222020-04-222020-05-0110.1016/j.watres.2020.115636https://infoscience.epfl.ch/handle/20.500.14299/168316WOS:000523571900041The 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/m(2)), focusing on the action modes of E. coli inactivation by the constituents involved in the composite process, at low tM 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/m(2)), 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. (C) 2020 Elsevier Ltd. All rights reserved.Engineering, EnvironmentalEnvironmental SciencesWater ResourcesEngineeringEnvironmental Sciences & Ecologyphoto-fentonsolar disinfectione. colilight intensitykineticswater treatmentadvanced oxidation processesescherichia-coli inactivationendogenous hydrogen-peroxidesimulated solar treatmentwater disinfectiondrinking-wateriron-oxidesfresh-waterneutral phh2o2text::journal::journal article::research article