Auteur / Autrice : | Antoine Souliès |
Direction : | Jérémy Pruvost, Teodor Burghelea, Cathy Castelain, Jérôme Morchain |
Type : | Thèse de doctorat |
Discipline(s) : | Sciences pour l’Ingénieur, Génie des procédés |
Date : | Soutenance en 2014 |
Etablissement(s) : | Nantes |
Ecole(s) doctorale(s) : | École doctorale Sciences pour l'ingénieur, Géosciences, Architecture (Nantes) |
Partenaire(s) de recherche : | Laboratoire : Génie des Procédés Environnement – Agroalimentaire (GEPEA) (Saint-Nazaire) |
autre partenaire : Université de Nantes. Faculté des sciences et des techniques | |
Jury : | Président / Présidente : Guillaume Ovarlez |
Examinateurs / Examinatrices : Jérémy Pruvost, Teodor Burghelea, Cathy Castelain, Guillaume Ovarlez, Jean-François Cornet, Jérôme Morchain | |
Rapporteurs / Rapporteuses : Jean-François Cornet |
Mots clés
Mots clés contrôlés
Mots clés libres
Résumé
Development of photobioreactor (PBR) for microalgal cultivation is actually of primary, considering the microalgae applicative potential. As well as any process, water and energy consumption have to be controlled. Intensified (PBR) appear here of great interest and especially high volumetric productivity PBR (PBR-HVP). These systems imply tu reduce drastically culture depth and to work with high biomass concentration. This highly disturbes hydrodynamic and light transfer into the system. This thesis concerns the study of those two lasts aspects for the case of the microalga Chlorella vulgaris. The first part concerns rheological study of concentrated suspensions, showing that rheological behaviour progress from a newtonian regime to a shear-thinning behaviour and _nally a yield stress one with the concentration increase. This has been con_rmed by a study of the flow in micro-channel by velocity profiles measurements. Cells aggregates formation has been especially observed, leading to astrong irreversibility of the flow. Using PBR-HVP under solar conditions results in a time evolution of the incident angle and spectrum of light. The second part of this thesis investigated radiative transfer in these conditions and their impacts on biomass productivity. Radiative properties and kinetic model of C. Vulgaris growth were determined. Both theoretical and experimental studies emphasize a strong pigment adaptation of C. Vulgaris culture as a response to variations of incident angle and spectrum.