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Modélisation des processus de transformation de l'azote en digestion anaérobie : application à l'optimisation de la valorisation des digestats

Abstract : Energetic recovery of waste by anaerobic digestion leads to the production of a residue called digestate, which is composed of non-biodegraded organic matter and has a high content of ammoniacal and organic nitrogen. Due to this high nitrogen content, digestates are growing interest for the substitution of mineral fertilizers. The objective of this thesis is to understand the transformations of nitrogen that occur during anaerobic digestion in order to predict the nitrogen quality of digestates. This understanding of nitrogen transformation processes will allows the design and management of anaerobic digestion plants aiming at the optimization of the substitution of mineral fertilizers by digestates. To this end, two approaches were used in this work: (i) an experiment approach focused on the understanding of the bioaccessibility of organic nitrogen in relation to its biodegradability, and the understanding of the transformations of nitrogen in anaerobic digestion under laboratory and pilot conditions; and; (ii) a numerical approach where previously developed knowledge has been integrated in statistical and biokinetic modeling tools to predict the nitrogen properties of digestates according to substrate cocktails and residence time in the digester.
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Submitted on : Tuesday, April 30, 2019 - 10:39:40 AM
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  • HAL Id : tel-02115249, version 1
  • IRSTEA : PUB00059883

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Younès Bareha. Modélisation des processus de transformation de l'azote en digestion anaérobie : application à l'optimisation de la valorisation des digestats. Sciences agricoles. Université Rennes 1, 2018. Français. ⟨NNT : 2018REN1B067⟩. ⟨tel-02115249⟩

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