Oxygen deficiency in closed waters seems to induce serious problems. The authors have been trying to solve the problem utilizing liquid membranes of bubbles cluster formed by aeration in the h-shaped pipe located near the water surface, which enables to improve DO condition in the water at high efficiency and low energy cost. In this paper experimental results are given for DO improvement of the above system. The oxygen transfer rate N (20) and the efficiency E P defined as the transfer rate per unit work rate required for aeration are examined for various values of the aeration depth H A , flow rate of supplied air Q g , and the height of the pipe H U . As the results, both N (20) and E P take high values when H U is small and H A is large. Also there is some optimum Q g for a given diameter of the pipe.
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