UVC-LED assisted photo-Fenton/peroxydisulfate processes for microcontaminant and bacteria removal in a continuous flow reactor according to EU 2020/741

dc.contributor.authorBenzaquén, T.B.
dc.contributor.authorPichel, N.
dc.contributor.authorSoriano-Molina, P.
dc.contributor.authorCasas López, J.L.
dc.contributor.authorLi Puma, G.
dc.contributor.authorSánchez Pérez, J.A.
dc.date.accessioned2025-07-29T11:05:34Z
dc.date.available2025-07-29T11:05:34Z
dc.date.issued2024-05-22
dc.description.abstractBacteria inactivation (Escherichia coli (E. coli), total coliforms, Clostridium perfringens (C. perfringens)) and simultaneous removal of ubiquitous microcontaminants in actual municipal wastewater treatment plant secondary effluents was investigated at neutral pH using the UVC-LED assisted photo-Fenton reaction system operated in continuous flow. E. coli concentration ≤ 10 CFU/100 mL and 38 % microcontaminant removal was achieved in the reaction system at a hydraulic residence time of 30 min. UVC light alone and UVC light combined with an oxidant source (hydrogen peroxide, H2O2, or peroxydisulfate, S2O82−) were found to have a predominant effect on disinfection, meeting the EU 2020/741 validation (≥5 log10 reduction) and monitoring (≤10 CFU/100 mL) targets for both E. coli and C. perfringens after 30 min of treatment in batch mode. However, in the presence of either 0.05 or 0.1 mM of ferric nitrilotriacetate (Fe3+-NTA) the bacteria inactivation kinetics decreased due to reduced UVC light penetration along the water depth. In contrast, microcontaminant removal was accelerated using 0.05 or 0.1 mM of Fe3+-NTA and 1.47 mM H2O2. Overall, the results revealed that the treatment conditions favouring microcontaminant removal hindered disinfection and vice versa, and that the disinfection levels of C. perfringens (≤102 CFU/100 mL) reached in the batch mode experiments could not be attained under the continuous flow regime. This points out the need of performing disinfection experiments under continuous flow operation, as shown in the present study to determine the disinfection performance of UVC-LED assisted photo-Fenton reaction systems.
dc.identifier.citationT.B. Benzaquén, N. Pichel, P. Soriano-Molina, J.L. Casas López, G. Li Puma, J.A. Sánchez Pérez, UVC-LED assisted photo-Fenton/peroxydisulfate processes for microcontaminant and bacteria removal in a continuous flow reactor according to EU 2020/741. Journal of Water Process Engineering 63 (2024), 105518
dc.identifier.doihttps://doi.org/10.1016/j.jwpe.2024.105518
dc.identifier.issn2214-7144
dc.identifier.urihttps://hdl.handle.net/10115/96117
dc.language.isoen
dc.publisherElsevier
dc.rightsAttribution-NonCommercial 4.0 Internationalen
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/
dc.subjectReclaimed water
dc.subjectAdvanced oxidation process
dc.subjectEscherichia coli
dc.subjectClostridium perfringens
dc.subjectMicropollutant
dc.titleUVC-LED assisted photo-Fenton/peroxydisulfate processes for microcontaminant and bacteria removal in a continuous flow reactor according to EU 2020/741
dc.typeArticle

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