Étude d'un procédé hybride de séparation couplant l’électrodialyse à membrane bipolaire et l’échange d'ions : application à la valorisation de solutions diluées d'acide organique

Abstract : This work is dedicated to the study of a hybrid separation process involving bipolar membrane electrodialysis and ion exchange. This study is applied to the treatment of diluted effluents. The aim is first to acquire a theoretical understanding of transfer processes and mechanisms that affect energy consumption of this hybrid system. Then, in a more applied way, the objective is to be able to propose a cell configuration that allows to remove the acid from the treated solution by transferring it to a concentration compartment. This configuration must allow to obtain the highest purification rates as possible while minimizing energy consumption. Criteria aiming at optimizing ion exchange resins (strong or weak) in dilution compartment are proposed. The interest of the introduction of strong cationic resin under H+ form in the concentrated compartment is highlighted, as it enables reducing compartment resistance and hence energy consumption. Furthermore, experimental measurements successively conducted with “decoupled” and “coupled” systems identified resistive contributions of the different elements of the stack. This approach led to the determination of parameters of a model which predicts the resin bed electrical resistance in a given solution. Specific energy consumption (kWh/Kg transferred acid) was evaluated as a function of the desired purification rate. All the work led to recommendations for the cell design and for the choice of operating parameters.
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Meyssa Jaouadi. Étude d'un procédé hybride de séparation couplant l’électrodialyse à membrane bipolaire et l’échange d'ions : application à la valorisation de solutions diluées d'acide organique. Génie des procédés. Université de Lorraine; École nationale d'ingénieurs de Gabès (Tunisie), 2016. Français. ⟨NNT : 2016LORR0208⟩. ⟨tel-01752412⟩

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