Use of an ejector for phenol containing water treatment by ozonation

Olivier Chedeville (1) , Marie Debacq (1) , Mauro Ferrante Almanza (1) , Catherine Porte (1)

1 LGP2ES - Laboratoire Génie des Procédés pour l'Environnement, l'Energie et la Santé

Mass transfer of ozone in aqueous phase is a major aspect of ozonation and advanced oxidation processes. The aim of this study is to compare the performances of an ejector with those of a more traditional gas/liquid contactor: a bubble column. The hydrodynamic study showed that the volumetric mass transfer coefficient of the ejector (KLa = 7.2 × 10−2 to 1.35 × 10−1 s−1) was greater than that of the bubble column's (KLa = 1.5 × 10−2 to 2.8 × 10−2 s−1). Very important differences in the values of the residence time and gas retention rate were also observed. A study of phenol degradation was performed. Due to its specifications the ejector is very efficient when the kinetics of reaction is fast (diffusion-controlled regime). In both semi-batch and open circuits, the phenol was quickly eliminated and the ozone transfer was very high (up to 98%). It is to be noted that these results were obtained for a processing time of approximately 1 s.

Mots clés: Mass transfer; Gas/liquid contactor; Ozone; Treatment process; Oxidation

Domaines: Génie des procédés; Génie chimique; Ingénierie de l'environnement

Olivier Chedeville, Marie Debacq, Mauro Ferrante Almanza, Catherine Porte. Use of an ejector for phenol containing water treatment by ozonation. Separation and Purification Technology, 2007, 57 (2), pp.201-208. ⟨10.1016/j.seppur.2007.04.004⟩. ⟨hal-00984185⟩