To provide a deep aeration device devised so as to make the length of an inner cylinder as short as possible to develop an aeration function until a water level falls down to the level corresponding to a shortened length of the inner cylinder.
In the deep aeration device 1 having an outer cylinder 2 having air exhaust means 10 and 11 and the inner cylinder 3 inserted into the outer cylinder 2 and dissolving oxygen in water (b) in a process for raising the water level in the inner cylinder 3 while drawing water into the inner cylinder 3 by the updrift due to aeration (a) to discharge water to the outside, a barrier wall member like a spiral body 17 for extending an updrift channel of the aeration (a) is provided in the inner cylinder 3.
COPYRIGHT: (C)2005,JPO&NCIPI
Keizo Takeo
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Kyuichi Ueki
Yoshio Asano