Abstracts
Résumé
L’étude de la photodégradation du 4-méthylphénol a été menée sur un pilote à recirculation. Cette molécule a été prise comme composé modèle pour le traitement des effluents de l’industrie avicole. Ce travail a consisté en l’optimisation et la modélisation de l’élimination du 4-méthylphénol par photocatalyse en présence de ZnO. L’utilisation des plans d’expériences, et en particulier de la méthodologie de surface de réponse (RSM) et un plan central composite (CCD), a permis la détermination de l’influence des effets simultanés et de l’interaction des paramètres opératoires sur le rendement de la photodégradation. Les paramètres étudiés sont la concentration initiale en 4-méthylphénol, la concentration en catalyseur et le débit de recirculation de la solution.
Les résultats montrent que l’application de la RSM permet de décrire d’une manière correcte l’influence de ces trois paramètres expérimentaux sur l’efficacité du traitement. Les valeurs optimales des paramètres donnant un rendement maximal (100 %) ont pu être déterminées. Les modèles de second ordre obtenus, pour le rendement de dégradation et pour l’abattement de DCO, ont été validés en utilisant différentes approches statistiques. L’utilisation de la méthode ANOVA a montré que les modèles sont hautement significatifs et en bonne adéquation avec les résultats expérimentaux.
Mots clés:
- photocatalyse,
- 4-méthylphénol,
- RSM,
- CCD,
- optimisation
Abstract
The study of the photodegradation of 4-methylphenol was carried out in a recirculating pilot plant. This compound is present in the liquid processing waste of the poultry industry. This work consisted of the optimization and the modelling of the elimination of 4-methylphenol by photocatalysis in the presence of ZnO. The use of a design of experiments (DOE) approach, and in particular the response surface methodology (RSM) and a central composite design (CCD), allowed the determination of the influence of the simultaneous effects and the interaction of the operational parameters on the degree of photodegradation. The studied parameters were the initial concentration of 4-methylphenol, the catalyst concentration and the solution recirculation flow. The RSM application made it possible to describe the influence of these three experimental parameters on the effectiveness of the treatment. The optimal parameter values leading to maximum efficiency (100%) were determined. The second-order models obtained for the degradation output and the reduction of COD were validated using various statistical approaches. The use of an ANOVA method showed that the models were highly significant and in good agreement with the experimental results.
Keywords:
- photocatalysis,
- 4-methylphenol,
- RSM,
- CCD,
- optimization
Appendices
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