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Optimisation de la digestion anaérobie de la vinasse de canne à sucre : modélisation et expérimentations à l’échelle du laboratoire

Abstract : Anaerobic digestion is a natural process where organic matter is degraded by microorganisms in the absence of oxygen, generating a biogas composed mainly of methane and carbon dioxide. The industrialisation of the process and the interest of biogas production as a renewable energy source led to the processing of a wide range of substrates. On an industrial scale, mechanical agitation or recirculation must allow the diffusion of microorganisms to the organic matter to be treated. These mechanical contributions are an important factor in energy consumption. In addition, the coupling and interrelationships between mechanical agitation inside the digesters and mass transfers have been poorly addressed in methanisation. This research proposes a first contribution to this problem. In this perspective, the impact of mechanical agitation on biogas yields of anaerobic digestion of raw vinasse using experiments is studied and a numerical simulations based on fluid mechanics (CFD) are carried out. The experiments carried out concern the determination of the methanogenic potential of the vinasse as well as the study under real conditions at different agitation intensities, following the physicochemical properties of the medium during digestion. In parallel, CFD simulations on flows in a mechanically stirred digester are performed to provide understanding of flows in a stirred digester. This work is in line with the literature review, particularly the fact that mechanical agitation has an impact on biogas yields.
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https://tel.archives-ouvertes.fr/tel-02894979
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Submitted on : Thursday, July 9, 2020 - 1:33:54 PM
Last modification on : Friday, July 10, 2020 - 3:43:06 AM

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2019LARE0029_HCaillet.pdf
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  • HAL Id : tel-02894979, version 1

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Hélène Caillet. Optimisation de la digestion anaérobie de la vinasse de canne à sucre : modélisation et expérimentations à l’échelle du laboratoire. Génie des procédés. Université de la Réunion, 2019. Français. ⟨NNT : 2019LARE0029⟩. ⟨tel-02894979⟩

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