| 摘要 |
<p>The hollow annular member (10) of generally horizontal appearance comprises a gas entry (11) towards the inside of its hollow region and an inner surface (12, 13) which defines a central passage (15) for liquid forming a constriction in the passage. In operation, the gas present in the hollow region is emitted through the openings (16) of the constriction. The annular member (10) comprises three feet (17, 18, 19) defining between them entry passage (20, 21) for liquid, these entry passages communicating with the lower end of the central passage (15). The device rests on the base of a receptacle for the treatment of aqueous effluents, and in particular in fish-farming tanks, the feet ensuring an optimum elevation. <IMAGE></p> |
