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  1. Susceptibility to chlorine of Aeromonas hydrophila strains.

    Article - En anglais

    The susceptibility of five Aeromonas hydrophila strains and one Escherichia coli strain to chlorine was studied under carefully controlled laboratory conditions.

    Of the Aer. hydrophila strains, two were from untreated water, two from tap water (immediately downstream of a water treatment plant) and one from the DSM collection.

    The study included disinfectant concentration (0.1,0.2 and 0.5 mgl-1), pH (6,7 and 8) and temperature (4,21 and 32 °C) as controlled variables.

    The results indicated that the untreated water strains, the DSM strain and the E. coli strain were inactivated within 1 min of chlorine treatment.

    The strains from chlorinated water (TW11 and TW27) showed a different susceptibility to chlorine disinfection, the rate of inactivation being greater at pH 6 than at pH 8 for both strains.

    Under the standard conditions of temperature 21°C, pH 7 and chlorine concentration 0.2 mg l-1, an increase or decrease of approximately 1 log unit in the number of bacteria did not affect the kill rate of the strains TW11 and TW27.

    Mots-clés Pascal : Etude comparative, Sensibilité résistance, Chlore, Traitement eau potable, Pathogène, Facteur milieu, Effet concentration, pH, Température, Aeromonas hydrophila, Vibrionaceae, Bactérie

    Mots-clés Pascal anglais : Comparative study, Sensitivity resistance, Chlorine, Drinking water treatment, Pathogenic, Environmental factor, Concentration effect, pH, Temperature, Aeromonas hydrophila, Vibrionaceae, Bacteria

    Logo du centre Notice produite par :
    Inist-CNRS - Institut de l'Information Scientifique et Technique

    Cote : 99-0199707

    Code Inist : 002A05B13. Création : 16/11/1999.