The objective of this present paper is to propose a new theoretical prediction method of the volumetric mass transfer coefficient (k L a) occurring in a gasliquid contactor based on the dissociation of the liquid-side mass transfer coefficient (k L ) and the interfacial area (a). The calculated results have been compared with those obtained with the experimental process in a small-scale bubble column. Tap water was used as liquid phase and an elastic membrane with a single orifice as gas sparger. Only the dynamic bubble regime was considered in this work (Re OR = 150-1000 and We = 0.002-4).This study has clearly shown that, whatever the operating conditions under test, the generated bubble diameters (d B ), bubble frequency (f B ) and their associated rising velocities (U B ) were the important parameters in order to predict, not only the values of k L a, but also the values of a and of k L . Moreover, these obtained results could provide a better understanding of the parameters which influence the oxygen transfer mechanism in the aeration process. By using the correlations to estimate these bubble hydrodynamics (d B and U B ), it diminishes times for measuring the associated mass transfer parameters and also their experimental complexities and errors.