Uチューブ型深層曝気槽の水理と酸素吸収特性に関する研究

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Hydrodynamics and mass transfer of a U-tube bioreactor were studied by measuring gas holdup, bubble diameter and intrinsic liquid side mass transfer coefficients. Gas holdup and bubble diameter were measured at three different points vertically in the downcomer and the riser respectively using an optical fiber two-phase flow meter. The results were well correlated by the following equationsUGd/εd=0.9(UGd+ULd)-0.25UGr/εr=0.97(UGr+ULr)-0.22Bz=7.69exp(-0.43UL) (atmospheric pressure/pressure at water depth Zm)Intrinsic liquid side mass transfer coefficients were measured in 4 zones of U-tube bioreactor (the gas dispersion zone and the bubbly flow zone in the downcomer, the bottom of the basin and the riser) using the chemical method of sulfite oxidation.It was verified that the hydrodynamic and mass transfer data obtained using the chemical method of sulfite oxidation were applicable to a full scale U-tube bioreactor.
1997-03-10