Abstract
A tested aerator are consisted of a vertical cylindrical vessel with a coaxial inner casing, and an axial flow impeller is arranged in an inner casing. As a circulatory flow is built up between the inner tube and the outer annulus, there isn't any dead zone in the flow area in this new-type stirred aerator. Moreover, a high efficiency of the impeller may be expected compared with the conventional stirred vane. First, the effect of the existence of inner casing on the performance of aeration, and secondly, the effects of the air supply position, air flow rate, impeller speed and the diameter of air bubbles on the oxygen transfer rate coefficient are studied. Moreover, the dissolution efficiency of the oxygen and the power consumption are investigated.
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