Department of Chemical Engineering and Environmental Technology, Environmental Sciences Institute (IUCA), University of Zaragoza, Zaragoza, Spain; School of Basic Sciences (SB), Institute of Chemical Science and Engineering (ISIC), Group of Advanced Oxidation Processes (GPAO), École Polytechnique Fédérale de Lausanne (EPFL), Station 6, CH-1015, Lausanne, Switzerland.
School of Basic Sciences (SB), Institute of Chemical Science and Engineering (ISIC), Group of Advanced Oxidation Processes (GPAO), École Polytechnique Fédérale de Lausanne (EPFL), Station 6, CH-1015, Lausanne, Switzerland; Universidad del Valle, Departamento de Química, Grupo de Investigación en Procesos Avanzados de Oxidación (GAOX), A.A. 25360 Cali, Colombia.
Water Res. 2020 May 1;174:115636. doi: 10.1016/j.watres.2020.115636. Epub 2020 Feb 19.
The aim of this research is to clarify the contribution of sunlight wavelengths, irradiance and Fe/HO 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), focusing on the action modes of E. coli inactivation by the constituents involved in the composite process, at low μM reactants concentration (Fe/HO) 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), and made possible even without the presence of UVA radiation, even when using low quantities of the Fenton reagents (0.5 mg/L Fe, 5 mg/L HO). Under light exposure, HO was found to augment the intracellular Fenton process and Fe 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.
本研究旨在阐明阳光波长、辐照度和 Fe/HO 在光芬顿工艺对清澈地表水中细菌消毒的贡献。我们考虑了不同的太阳光谱分布（可见光、UVA-可见光）和亚临界辐照度（0-400 W/m），重点研究了在低浓度反应物（Fe/HO）存在下，复合过程中涉及的成分对大肠杆菌失活的作用模式ultrapure (MQ) 水。我们报告说，即使没有 UVA 辐射，甚至在使用低浓度芬顿试剂（0.5 mg/L Fe，5 mg/L HO）的情况下，通过光芬顿试剂（光芬顿工艺）进行的太阳能消毒从非常低的光辐照度值（200 W/m）开始就是现实。在光照下，发现 HO 增强了细胞内的芬顿反应，而 Fe 则引发了进一步的不同氧化作用。最后，在更宽的辐照度范围内对日内瓦湖水进行了验证，结果表明光芬顿过程在低辐照度下依赖于试剂，在较高辐照度下则转向光驱动。
