Inactivation of Severe Acute Respiratory Syndrome Coronavirus 2, Herpes Simplex Virus Type 1, Vaccinia Virus, and Human Adenovirus Type II in Water using Ultraviolet Light-Emitting Diodes at 265 nm and 275 nm

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ABSTRACT Waterborne viruses, such as adenovirus, herpesvirus, severe acute respiratory syndrome coronavirus 2, and vaccinia virus, pose a health risk due to their persistence and structural variability. Ultraviolet C light-emitting diodes have emerged as a promising alternative to conventional mercury lamps, due to their energy efficiency, durability, and absence of mercury. This study evaluated the inactivation of these four viruses in water by exposure to light-emitting diodes with wavelengths of 265 nm and 275 nm. Ultraviolet light doses were quantified by chemical actinometry; inactivation kinetics were adjusted to log-linear and Weibull models, and statistical differences between treatments were evaluated by analysis of variance (p < 0.05). Results indicated a reduction ≥ 4 logs for all viruses, with doses ranging from 19.0 to 40.9 mJ/cm², depending on the virus, lower than those found in the literature for conventional systems. The Weibull model showed a better fit, suggesting resistant viral subpopulations. No statistically significant differences were observed between wavelengths in all viruses. It is concluded that ultraviolet C light-emitting diodes are highly effective for viral disinfection in water, offering a sustainable and energy-efficient alternative for water disinfection applications.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.