RT journal article
T1 UV-LED disinfection of emerging Vibrio pathogens: inactivation kinetics and reactivation potential
A1 Romero Martínez, Leonardo
A1 Prieto-Pérez-Juez, Amalia
A1 Nebot Sanz, Enrique
A1 Moreno Andrés, Javier
A2 Tecnologías del Medio Ambiente
K1 marine disinfection
K1 emerging waterborne pathogens
K1 bacterial repair
K1 LED-based water treatment
K1 species-specific inactivation
K1 aquaculture biosecurity
K1 marine pathogen control
AB Introduction: The Vibrio genus includes aquatic bacteria from freshwater, estuarine, and marine environments, some of which pose significant risks to public and environmental health, highlighting the need for effective disinfection strategies. This study investigated the inactivation kinetics, reactivation potential, and energy efficiency of UV-LEDs emitting at 265 nm and 275 nm for controlling Vibrio alginolyticus and Vibrio parahaemolyticus, two emerging marine pathogens. Methods: Bacteria were exposed to UV irradiation under different post-treatment conditions (0 d, 1 d-dark, 1 d-light), and both inactivation rate constants (k, mJ·cm-2) and electrical energy per n-log reduction (EEL,n) were obtained and analyzed. Results and discussion: Results showed that V. parahaemolyticus was more UV-sensitive than V. alginolyticus, with inactivation rate constants of 1.22 and 1.60 cm2·mJ-1 at 265 and 275 nm, respectively, compared to 0.82 and 0.69 cm2·mJ-1 for V. alginolyticus. No significant differences were observed between the two wavelengths (265 nm and 275 nm) in terms of inactivation rate constants. As a result, achieving a 2-log reduction required lower fluences for V. parahaemolyticus (3.68–2.89 mJ·cm-2) than for V. alginolyticus (5.53–6.85 mJ·cm-2). Post-treatment incubation caused a decline in k-values one day after UV exposure, particularly under light conditions, with reductions of up to 59.9% at 275 nm and 48.8% at 265 nm. Although the decrease in k-values under dark conditions was less pronounced (average 27.9%), it remains noteworthy when compared with other fecal bacterial indicators. Electrical energy analyses revealed lower EEL,1 values at 275 nm, indicating greater energy efficiency, with values ranging from 0.012 to 0.050 kWh·m-3 for both Vibrio species. These results support the need for wavelength-specific optimization to balance disinfection efficacy and energy efficiency in marine water treatment and seafood safety applications.
PB Frontiers
SN 2296-7745
YR 2025
FD 2025-09-30
LK http://hdl.handle.net/10498/39282
UL http://hdl.handle.net/10498/39282
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 21-sep-2026