| 摘要 |
A method of and an apparatus for aerating and circulating a liquid in a vessel comprising utilizing a surface aerator and a bottom mixing rotor mounted on a hollow common shaft. The rotor entrains liquid and air into the hollow center of the common shaft from the liquid surface region and affects a downward two-phase flow in the hollow center. The gas-liquid mixture is subsequently injected into the liquid body through the channels of the rotor which communicate with the hollow center of the shaft. The discharged jet streams disperse the entrained gas bubbles throughout the liquid body and provide turbulent mixing in the bottom section of the vessel. The present invention not only provides sufficient bottom mixing but also enhances the mass transfer efficiency of the surface aeration by enriching the gas content in the surface layer of the liquid.
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