Mme : YAHIAOUI Nouara
Soutiendra sa thèse de Doctorat en chimie
Intitulé : « Traitement et de la margine d’olive par le procédé de la co-précipitation en utilisant l’hydroxyapatie. ».
Le : 03 Novembre 2021 à Salle de conférences de la faculté des Sciences (4ème étage) à 09h :30
Directeur de Thèse : Professeur MOUSAOUI Ramdane
Devant le jury d’examen suivant :
M. ELIAS Abdelhamid | Professeur | UMMTO | Président |
M. MOUSAOUI Ramdane | Professeur | UMMTO | Directeur de thèse |
M. KADI Hocine | Professeur | UMMTO | Co-directeur |
M. BENAICHA Mohamed | Professeur | UFA-Setif | Examinateur |
Mme BELHANECHE Naima | Professeur | ENP-Alger | Examinatrice |
M. CHEMAT Smail | Directeur de recherche | CRAPC Alger | Examinateur |
Mots clés
Margine, hydroxyapatite, composés phénoliques, DCO, coprécipitation, extraction, calcination, cinétique et plans d’expériences.
Abstract
The aim of this study was to synthesize hydroxyapatite by precipitation method for reducing the phenolic compounds and COD in olive mill wastewater by the co-precipitation process.
Results of the optimization synthesis of hydroxyapatite by the response surface technique showed that the stoichiometric hydroxyapatite (with Ca/P = 1.67) was obtained using reagents Ca/P molar ratio of 1.70, Ca 2+ concentration of 1.50 M and reaction time of 45 h.
The co-precipitation process of phenolic compounds and COD with synthesized hydroxyapatite was carried out using experimental methodology. This approach allowed us to quickly identify the influencing factors on the process and the interactions between them. The best reductions of phenolic compounds (87, 30%) and COD (76, 30%) were obtained at pH 12 with solid/liquid ratio of 10 g/L and reaction time of 30 min.
Phenolic compounds extraction from the charged hydroxyapatite using diethyl ether as solvent with a liquid /solid ratio of 40 mL/g allowed us to recover 25.50% of polyphenols. Reuse of regenerated hydroxyapatite by calcination in olive mill wastewater treatment by the same process allowed for a good reduction of phenolic compounds and COD.
Kinetic modeling of the co-precipitation process by several mathematical models showed that the logarithmic model fits better the predicted concentrations by the response surface methodology. This model corresponds to the kinetic of the first order.
Key words
Olive mill wastewater, hydroxyapatite, phenolic compounds, COD,
co-precipitation, extraction, calcination, kinetics and experimental designs.