Abstract: Matériaux & Techniques 95, 67-67 (2007) - Erratum : Détermination électrochimique de l'épaisseur des biofilms dans les circuits d'eauN° Hors Série : VIII ème Forum de Biodétérioration des Matériaux ; International audience ; Electrochemical determination of biofilm thickness in water systems.Biofilms are growing on the internal wall of the water pipelines, this is a constantproblem of health risk. The legionella which proliferate in the warm waters networks andin cooling towers, are at the origin of more than 1000 cases of Legionnaire’s disease peryear in France during the last three years, the death rate being about 14%. To control thisbacterial development, a better understanding of biofilms ecology is necessary, in particulartheir growth and their composition. In this purpose, three working years of collaborationbetween the company Henkel Concorde and 2 CNRS research teams (UMR 6008 and UPR 15)allowed to develop a tool able to measure the biofilm thickness. On laboratory pilots andin industrial site, this biofilm thickness measurement showed a very acceptable reliabilityand sensitivity to follow the behaviour of a biofilm in a water circuit and to evaluate theefficiency of the treatments (dispersing, biocide) which are applied. The use of this toolallows to optimize the applied treatments (nature, dose, frequency of injection) and leadsto a strong reduction of the sessile biomass. Thanks to this sensor the cleanliness of watercircuits could be maintained with a better efficiency and thus a greater control of thelegionella risk could be obtained. ; La croissance de biofilms sur les parois des réseaux et des circuits d’eaux est unproblème récurrent en terme de santé publique. Les légionelles qui se développent dans lesréseaux d’eaux chaudes et les tours aéroréfrigérantes ont été à l’origine de plus de 1000 casannuels de légionellose en France au cours des 3 dernières années, la létalité étant d’environ14 %. Pour maîtriser ce développement bactérien, il est nécessaire de posséder unemeilleure compréhension ...
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