| 摘要 |
A device for stirring and aerating a liquid in a treatment vessel may include a funnel disposed in the upper portion of the vessel to form a passage with the vessel. A duct is connected to the funnel and extends toward the bottom of the vessel and includes an opening in each of its upper and lower portions. A main screw is situated in the duct and has a driving device for driving its rotation. Also, the stirring device may include an aerating device that incorporates air into the liquid by imparting movement to the liquid inside the stirring device so that the liquid cascades over an upper edge and a peripheral structure disposed in the vicinity of the upper edge of the funnel.
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