Contrôle hydrodynamique de la formation des biofilms en milieu eaux usées

Abstract : Bacterial biofilms develop on any solid-liquid interface whenever conditions are appropriate. They correspond to microcolony assemblages embedded in an extracellular matrix. Among the factors controlling biofilm growth, hydrodynamics is a key parameter affecting both biofilm morphology and composition. In this thesis we investigate the influence of hydrodynamics, and more precisely the wall shear rate effect on biofilm development. For this purpose, a Couette-Poiseuille reactor, allowing to work under stable laminar flow with different flow velocities, was used. Biofilms grown from urban wastewater on coupon surfaces were observed with confocal scanning microscopy. A 3D modeling using GOCAD software was established, thus allowing the determination of various biofilms structural characteristics. The results show the essential role of convective mass transport in biofilm formation, actually a zero wall shear rate inhibited bacterial deposition, and hence biofilm growth.
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Rime El Khatib. Contrôle hydrodynamique de la formation des biofilms en milieu eaux usées. Sciences agricoles. Institut National Polytechnique de Lorraine, 2011. Français. ⟨NNT : 2011INPL091N⟩. ⟨tel-01749490⟩

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