Wavelength synergistic effects in continuous flow-through water disinfection systems

dc.contributor.authorPai Uppinakudru, Adithya
dc.contributor.authorMartín Sómer, Miguel
dc.contributor.authorReynolds, Ken
dc.contributor.authorStanley, Simon
dc.contributor.authorBautista, Luis Fernando
dc.contributor.authorPablos, Cristina
dc.contributor.authorMarugán, Javier
dc.date.accessioned2025-02-06T07:20:46Z
dc.date.available2025-02-06T07:20:46Z
dc.date.issued2023-12-01
dc.descriptionThe authors acknowledge the financial support of the European Union's Horizon 2020 research and innovation programme in the frame of REWATERGY, Sustainable Reactor Engineering for Applications on the Water-Energy Nexus, MSCA-ITN-EID Project N. 812574. We thank Cristina Ramírez-Miguel and María Luisa Perez-Araújo for technical assistance
dc.description.abstractThe past decade's development of UV LEDs has fueled significant research in water disinfection, with widespread debate surrounding the potential synergies of multiple UV wavelengths. This study analyses the use of three UV sources (265, 275, and 310 nm) on the inactivation of Escherichia coli bacteria in two water matrixes. At maximum intensity in wastewater, individual inactivation experiments in a single pass set-up (Flow rate = 2 L min−1, Residence time = 0.75 s) confirmed the 265 nm light source to be the most effective (2.2 ± 0.2 log units), while the 310 nm led to the lowest inactivation rate (0.0003 ± 7.03 10−5 log units). When a combination of the three wavelengths was used, an average log reduction of 4.4 ± 0.2 was observed in wastewater. For combinations of 265 and 275 nm, the average log reductions were similar to the sum of individual log reductions. For combinations involving the use of 310 nm, a potential synergistic effect was investigated by the use of robust statistical analysis techniques. It is concluded that combinations of 310 nm with 265 nm or 275 nm devices, in sequential and simultaneous mode, present a significant synergy at both intensities due to the emission spectra of the selected LEDs, ensuring the possibility of two inactivation mechanisms. Finally, the electrical energy per order of inactivation found the three-wavelength combination to be the most energy efficient (0.39 ± 0.05, 0.36 ± 0.01 kWh m−3, at 50% and 100% dose, respectively, in wastewater) among the synergistic combinations.
dc.identifier.citationUppinakudru, A. P., Martín-Sómer, M., Reynolds, K., Stanley, S., Bautista, L. F., Pablos, C., & Marugán, J. (2023). Wavelength synergistic effects in continuous flow-through water disinfection systems. Water Research X, 21, 100208.
dc.identifier.doihttps://doi.org/10.1016/j.wroa.2023.100208
dc.identifier.issn2589-9147
dc.identifier.urihttps://hdl.handle.net/10115/75237
dc.language.isoen
dc.publisherElsevier
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internationalen
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectE. coli
dc.subjectDisinfection
dc.subjectKinetic constant
dc.subjectSynergyUltraviolet light
dc.subjectWastewater
dc.titleWavelength synergistic effects in continuous flow-through water disinfection systems
dc.typeArticle

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