Fecha: 12/04/2011
Idioma: Inglés
Autor: Varios autores
Procedencia: The Medical College of Pennsylvania, Philadelphia

Continuous ultraviolet light (u.v.) and chemical disinfection of circulating water systems were evaluated Direct comparisons of the biocidal effectiveness of u.v. light vs halogenation were tested with Legionella spp and Pseudomonas aeruginosa because of their association with the acquisition of overt clinical disease from water-containing appliances. Findings indicated that six species of Legionella and P. aeruginosa were killed by a moderate level of u.v. radiation. L. pneumophila and other bacteria in a
circulating water system were effectively killed by a biocidal u.v. light. However, free chlorine levels needed to kill Legionella, Pseudomonas, and Flavobacterium within 1 mm were found to be greater than 4 mg ml -1. Data from a long-term field trial with u.v.
light treatment of evaporative condenser water showed a significant reduction in numbers of bacteria. Ultraviolet disinfection of hospital hydrotherapy whirlpools confirmed the utility of this mode of disinfection under circumstances where chlorination may not be practical for medical reasons. These findings were confirmed during investigations of halogenated or u.v.-treated public hot tub/whirlpools. The effectiveness of routine chemical disinfection for controlling microbial flora in a cooling tower was also
evaluated. The 2 month survey indicated that the numbers of bacteria, including Legionella, were not affected by two biocides that were used. The observations made during this investigation support the conclusion that u.v. light disinfection of water-containing systems may be an appropriate alternative or supplement to chemical biocides.
– Introduction
– Materials and methods
– Results

Authors: Richard W. Gilpin, Susan B. Dillon, Patricia Keyser, Alice Androkites, Mary Berube, Nichola Carpendale, Jane Skorina, James Hurley



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