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Formulation of adsorbent based on natural materials and their combinations to the electrochemical process for treating industrial effluents

Abstract : Olive mill technology generates a considerable amount of solid (olive pomace) and liquid (olive mill wastewater) by-products during olives milling season, usually between November and March. These wastes represent a great challenge for olive oil producers since they must find technical, environmental and economical solutions to manage these by-products. The main objective of this thesis was to explore and propose a complete cycle of olive mill wastes treatment. This is in the framework of a zero liquid and waste discharge approach and promotes the circular economy concept. Two sorbents based on olive pomace chemical activation, i.e., powdered activated carbon within composite alginate beads and granular activated carbon (GAC), were successfully synthetized. Both materials had a structure and a porous morphology that revealed their feasibilities as potential and low-cost bio-sorbents. They were employed in either adsorption or electrosorption for phenolic compounds (PCs) recovery from olive mill wastewater (OMWW). The adsorption of PCs fitted second-order kinetics (R2 = 0.997) and Langmuir isotherms (R2 = 0.995). The thermodynamic parameters for the PCs adsorption onto the bio-adsorbent suggested a spontaneous nature of adsorption, an endothermic reaction and a modification of bio-adsorbent surface during the adsorption process. Thomas's model was better at predicting PCs column adsorption (R2 =0.97). Finally, the investigation of bio-adsorbent regeneration showed that the recovery of phenols from OMWW could be carried out with ethanol (43% of PCs recovered) or hydrochloric acid (90% of PCs recovered). The results of electrochemical characterization of the two bio-adsorbent electrodes showed that the high electroactive surface area, the high value of exchange current intensity (I0) and the low value of charge transfer resistance (RCT) could be promising properties for electrosorption studies. Electrosorption improved the adsorption capacity of the composite beads from 123 to 170 mg g-1 and the removal rate of PCs from 66 to 74% for GAC. Furthermore, the electrosorption of organic compounds was shown for the first time with real wastewater. New models were developed to better understand and predict PCs electrosorption kinetics, including transient mass transport. The remaining organic compounds in OMWW were then eliminated (91 % of chemical oxygen demand (COD) removed) by advanced electro-oxidation treatment, while the bio-adsorbent was regenerated (34.5% of PCs recovered) by an electrochemical method.
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Submitted on : Thursday, June 23, 2022 - 3:12:53 PM
Last modification on : Friday, June 24, 2022 - 3:37:40 AM

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Amina Lissaneddine. Formulation of adsorbent based on natural materials and their combinations to the electrochemical process for treating industrial effluents. Chemical and Process Engineering. Université de Lorraine; Université Cadi Ayyad (Marrakech, Maroc), 2021. English. ⟨NNT : 2021LORR0296⟩. ⟨tel-03702986⟩

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