In the present work, power characteristics of a gas-induced contactor have been studied. The onset speed for gas induction at different liquid levels has been determined. The effects of impeller speed, gas induction, gassing and liquid level on power consumption have been examined. In this system power number was between I and 2 at impeller speeds of 400-1600 rpm. At low impeller speeds, power consumption decreased significantly by gassing (60% drop in power consumption at speed of 800 rpm), while at higher speeds, because of gas induction, effect of gassing on power consumption was not considerable (15% drop at speed of 1600 rpm). For high and same impeller speeds, power consumption of this contactor is lower than that of Rushton and flat blade disk turbine (FBDT) agitated contactors. (C) 2004 Elsevier B.V. All rights reserved.