The wetted columns both with tangential nozzles and turbulence promoters are of great interest. The spiral motion of a liquid film gives a good stability and a great turbulence to the film. It results in the increase of the rate of transfer processes compared with those both in smooth and rough wall columns. The liquid phase mass transfer coefficients for the absorption of carbon dioxide into water have been measured on three types of threaded surfaces. The enhancement film mass transfer criteria have been proposed. The positive effect of surface ribbing in a helix in comparison with similar form incisions perpendicular to apparatus axis has been shown.