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Couplage de la méthanisation et des électrotechnologies : intentisification de la production de biogaz et du séchage du digestat

Abstract : The limitation of the biogas production related to the accessibility of the substrates with a low biochemical methane potential, as well as the constraints of spreading which lead to the drying of the digestate, in order to stabilize or to transport the dried digestate, are two issues for the development of the methanisation process. The cellular disintegration’s effect induced by Pulsed Electrical Field (PEF) pretreatment on biogas production is evaluated on different substrates. The applied field’s strength is varied between 500 and 3600 V/cm and the corresponding cell disintegration index were calculated. The influence of PEF pretreatment on methane production was examined in a 500 mL batch reactor using the experimental design methodology and integrating different methods of preparation (size of particles, preheating, hygenisation). The obtained results show that PEF treatment can significantly increase the biogas production (+5.2 to +12.5% CH4). For the drying of the digestates, a convective drying system with hot air at a moderate temperature (40 to 70°C) is used. On the one hand, the effects of air velocity and drying temperature are evaluated. On the other hand, the effects of pre-processing by PEF, by microwaves, and after a freeze thawing cycle were also tested. Using the second Fick's law, the effective diffusion coefficients are identified and it was concluded that PEFs are ineffective for drying the digestates under the tested drying conditions.
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Submitted on : Wednesday, April 11, 2018 - 3:23:08 PM
Last modification on : Wednesday, October 14, 2020 - 4:09:26 AM

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  • HAL Id : tel-01763674, version 2

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Mohamad Amr Chamaa. Couplage de la méthanisation et des électrotechnologies : intentisification de la production de biogaz et du séchage du digestat. Génie des procédés. Université de Bretagne Sud, 2017. Français. ⟨NNT : 2017LORIS463⟩. ⟨tel-01763674v2⟩

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