Laboratory observations of biocide efficiency against Legionella in model cooling tower systems

The efficacy of specific oxidizing and non-oxidizing biocides was examined using a model cooling system inoculated with a microcosm containing an environmental isolate of Legionella pneumophila. The microcosm consisted of both sessile and planktonic Legionella in association with other microorganism...

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Bibliographic Details
Published in:ASHRAE transactions 1999-01, Vol.105, p.607-623
Main Authors: Thomas, William M, Eccles, Jason, Fricker, Colin
Format: Article
Language:English
Subjects:
Biocides
Chemical water treatment
Chemostats
Diseases
Health risks
Risk assessment
Risk management
Water bacteriology
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Summary:The efficacy of specific oxidizing and non-oxidizing biocides was examined using a model cooling system inoculated with a microcosm containing an environmental isolate of Legionella pneumophila. The microcosm consisted of both sessile and planktonic Legionella in association with other microorganisms, including Pseudomonas species and cyst-forming ameobae. A procedure was established to successfully transfer the chemostat-grown inoculum to the model cooling system and establish both sessile and planktonic forms of Legionella in the model. Chemostat-grown Legionella were found to be less susceptible to the test biocides compared with other available data for laboratory-cultured Legionella.
ISSN:0001-2505