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Temperature diagnostic to identify high risk areas and optimize Legionella pneumophila surveillance in hot water distribution systems

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Bédard, Émilie, Fey, Stéphanie, Charron, Dominique, Lalancette, Cindy, Cantin, Philippe, Dolcé, Patrick, Laferrière, Céline, Déziel, Éric ORCID: https://orcid.org/0000-0002-4609-0115 et Prévost, Michèle (2015). Temperature diagnostic to identify high risk areas and optimize Legionella pneumophila surveillance in hot water distribution systems Water Research , vol. 71 . p. 244-56. DOI: 10.1016/j.watres.2015.01.006.

[thumbnail of Bedard2015_Manuscript_Temperature Diagnostic.pdf]
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Résumé

Legionella pneumophila is frequently detected in hot water distribution systems and thermal control is a common measure implemented by health care facilities. A risk assessment based on water temperature profiling and temperature distribution within the network is proposed, to guide effective monitoring strategies and allow the identification of high risk areas. Temperature and heat loss at control points (water heater, recirculation, representative points-of-use) were monitored in various sections of five health care facilities hot water distribution systems and results used to develop a temperature-based risk assessment tool. Detailed investigations show that defective return valves in faucets can cause widespread temperature losses because of hot and cold water mixing. Systems in which water temperature coming out of the water heaters was kept consistently above 60 degrees C and maintained above 55 degrees C across the network were negative for Legionella by culture or qPCR. For systems not meeting these temperature criteria, risk areas for L. pneumophila were identified using temperature profiling and system's characterization; higher risk was confirmed by more frequent microbiological detection by culture and qPCR. Results confirmed that maintaining sufficiently high temperatures within hot water distribution systems suppressed L. pneumophila culturability. However, the risk remains as shown by the persistence of L. pneumophila by qPCR.

Type de document: Article
Mots-clés libres: Culturability; Legionella pneumophila; Premise plumbing; Temperature profile; Thermal control; Viable but not culturable (VBNC)
Centre: Centre INRS-Institut Armand Frappier
Date de dépôt: 05 janv. 2016 22:09
Dernière modification: 21 févr. 2022 19:59
URI: https://espace.inrs.ca/id/eprint/3147

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