The broad experimental study of hydrodynamics and the dust separation efficiency in two-phase rotating flow has been carried out by a joint team under the project funded by the Royal Society (UK). It was found that within the rotating two-phase flow the specific interphase surface between air and water reaches up to 1000 m2/m3 being two times as much as high than that in traditional equipment based on the concept of two-phase flow. Total pressure losses, pressure drop within rotating two-phase flow were measured and components of pressure drop were assessed. The experimental correlations for the average rotating velocity of air-water flow, average bubble diameter have been obtained as a result of the experimental study. The fine dust separation efficiency within rotating two-phase flow has been studied and the experimental and theoretical correlations for the fractional efficiency has been developed. It was shown that the dust separation efficiency exceeds results available for the other equipment currentiy used in separation technology in terms of the total clean-up efficiency and the minimal 'cut-off diameter of separated particles.