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Article

Simultaneous Disinfection and Organic Microcontaminant Removal by UVC-LED-Driven Advanced Oxidation Processes

1
Programa Institucional de Fomento a la I+D+i, Universidad Tecnológica Metropolitana, Ignacio Valdivieso 2409, San Joaquín, 8940577 Santiago, Chile
2
Centre (CIESOL), Joint Centre University of Almería—CIEMAT, Ctra. Sacramento s/n, 04120 Almería, Spain
3
Chemical Engineering Department, University of Almería, Ctra. Sacramento s/n, 04120 Almería, Spain
*
Author to whom correspondence should be addressed.
Academic Editors: Antonio Zuorro, Christos S. Akratos and Giusy Lofrano
Water 2021, 13(11), 1507; https://doi.org/10.3390/w13111507
Received: 25 April 2021 / Revised: 13 May 2021 / Accepted: 25 May 2021 / Published: 27 May 2021
(This article belongs to the Special Issue Wastewater Treatment by Using the Photocatalysis)
This work presents the comparison of four advanced oxidation processes driven by UVC-LED radiation (278 nm—2 W/m2) for simultaneous bacteria inactivation (Escherichia coli—106 CFU/mL) and microcontaminant removal (imidacloprid—50 µg/L) in simulated wastewater secondary effluent. To this end, the activation of H2O2 and S2O82− as precursors of HO and SO4•−, respectively, by UVC-LED and UVC-LED/Fe3+–NTA (ferric nitrilotriacetate at 0.1 mM) has been studied at different oxidant concentrations. For the purpose of comparison, conventional chlorination was used as the baseline along with bacterial regrowth 24 h after treatment. Disinfection was achieved within the first 30 min in all of the processes, mainly due to the bactericidal effect of UVC-LED radiation. UVC-LED/H2O2 did not substantially affect imidacloprid removal due to the low HO generation by UVC irradiation at 278 nm, while more than 80% imidacloprid removal was achieved by the UVC-LED/S2O82−, UVC-LED/Fe3+–NTA/S2O82−, and UVC-LED/Fe3+–NTA/H2O2 processes. The most efficient concentration of both oxidants for the simultaneous disinfection and microcontaminant removal was 1.47 mM. Chlorination was the most effective treatment for bacterial inactivation without imidacloprid removal. These findings are relevant for scaling up UVC-LED photoreactors for tertiary wastewater treatment aimed at removing bacteria and microcontaminants. View Full-Text
Keywords: light-emitting diodes; wastewater treatment; advanced oxidation processes light-emitting diodes; wastewater treatment; advanced oxidation processes
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MDPI and ACS Style

Miralles-Cuevas, S.; De la Obra, I.; Gualda-Alonso, E.; Soriano-Molina, P.; Casas López, J.L.; Sánchez Pérez, J.A. Simultaneous Disinfection and Organic Microcontaminant Removal by UVC-LED-Driven Advanced Oxidation Processes. Water 2021, 13, 1507. https://doi.org/10.3390/w13111507

AMA Style

Miralles-Cuevas S, De la Obra I, Gualda-Alonso E, Soriano-Molina P, Casas López JL, Sánchez Pérez JA. Simultaneous Disinfection and Organic Microcontaminant Removal by UVC-LED-Driven Advanced Oxidation Processes. Water. 2021; 13(11):1507. https://doi.org/10.3390/w13111507

Chicago/Turabian Style

Miralles-Cuevas, Sara, Irene De la Obra, Elizabeth Gualda-Alonso, Paula Soriano-Molina, José L. Casas López, and José A. Sánchez Pérez 2021. "Simultaneous Disinfection and Organic Microcontaminant Removal by UVC-LED-Driven Advanced Oxidation Processes" Water 13, no. 11: 1507. https://doi.org/10.3390/w13111507

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