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M. X. , C. S. Buès, M. &. Schwartzbrod, and J. , Mécanismes d'adsorption des oocystes de Cryptosporidium parvum, 2000.

;. Compte-rendu-de-la and . Biologique, Journée Scientifique du Programme « Environnement et Santé », 2000.

L. 'objectif-de-notre-travail-est-d'étudier-le-transport-d'un-micro-organisme-pathogène and C. Parvum, Ce travail se positionne dans une thématique de protection efficace des ressources en eau vis-à-vis de la contamination par des oocystes de C. parvum. En effet, ce parasite, qui infecte les mammifères, présente une résistance élevée à la plupart des désinfectants classiquement utilisés dans le traitement de l'eau. Il est rencontré dans les eaux souterraines et responsable de plusieurs épidémies d'origine hydrique. Tout d'abord, nous avons dû développer une technique de titrage adaptée à nos besoins, notamment en terme de précision. Ensuite, nous .avons réalisé un premier type d'expérimentations en milieu saturé et sans écoulement, des essais batch, qui ne nous ont pas permis de mettre en évidence de phénomène d'adsorption sur tous les substrats testés (silice, calcaire, feldspaths, argiles ou alumine). Puis, nous avons mené un second type d'expérimentations, en milieu saturé et avec écoulement, des essais en colonne. Afin de travailler avec de faibles volumes de solution dopée en micro-organismes et, donc, de limiter les risques de contaminations, nous avons développé un essai en colonne à circulation fermée : le flux massique sortant de la colonne est injecté en entrée de colonne. Pour interpréter les résultats de cet essai, nous avons créé un modèle numérique en considérant C. parvum comme un colloïde biologique, Les résultats ont montré que le débit volumique et la granulométrie modifient la rétention

, Mots clés : Cryptosporidium parvum ; Colloïde biologique ; Immunofluorescence ; Essai en colonne à circulation fermée ; Filtration ; Adsorption

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