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Etude et modélisation du compartiment nitrifacteur de la boucle MELiSSA : coculture sur ammonium et triculture sur urée

Abstract : Physico-chemical processes are used on the International Space Station for partial recycling of wastes in order to minimize the resupplies of oxygen and water. Further and longer explorations can only be possible if a life support system is applied to enhance autonomy to the station. MELiSSA is a biological life support system project aiming for waste recycling, water and air regeneration and production of simple food. The only way to assure these functions is the use of microorganisms which is requiring a high knowledge and a perfect control of processes implicated. The thesis objectives consist in developing a predictive model for the MELiSSA nitrifying compartment. First, a kinetic study of Nitrosomonas europaea ATCC® 19718 and Nitrobacter winogradskyi ATCC® 25391 in submerged bioreactors allowed defining a kinetic model of nitrification. Secondly, this model was combined to an N-tanks in series one to compose a nitrification model in fixed-bed biorectors : NitriSim. It was applied on a long-term experiment in a fixed-bed bioreactors where the bed was composed of Biostyr® beads. The last part of this work was about the use of a urea-degradating bacteria, Cupriavidus pinatubonensis, in the fixed-bed bioreactor. All of these results leaded to the development of a nitrification in fixed-bed reactors model and opened up interesting prospects for the urine degradation in the nitrifying compartment of MELiSSA.
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Nelly Cruvellier. Etude et modélisation du compartiment nitrifacteur de la boucle MELiSSA : coculture sur ammonium et triculture sur urée. Génie des procédés. Université Clermont Auvergne, 2017. Français. ⟨NNT : 2017CLFAC007⟩. ⟨tel-01791291⟩

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