Oxygen Transfer into an Aeration Tank with Consideration to Three Transfer Routes

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  • 散気式ばっ気そうへの酸素移動経路を考慮した移動速度の実験的検討
  • サン キシキ バッキソウ エ ノ サンソ イドウ ケイロ オ コウリョシタ イ

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Oxygen dissolves into water from dispersed bubbles and the water surface in a diffused aeration tank. The water surface can be divided into two regions, free surface and surface of bubble-bursting region. The bubble-bursting region is formed at the water surface above the gas diffuser. To evaluate the oxygen transfer rates of the three routes, oxygen concentrations at dynamic equilibrium were measured when nitrogen and air were used as diffused gas and gas on the free surface, in addition to measuring KLa as usual.<BR>By experiment, where (width of tank) / (depth of water) =2, the following results were obtained.<BR>1) The ratio of oxygen transfer rate from diffused bubbles to total oxygen transfer rate increases when diffused gas flow rate increases, and it is independent of tank scale.<BR>2) Oxygen transfer coefficient in liquid phase at free surface is smaller by about one order of magnitude than that around diffused bubbles.

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