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Patent

Improved aerator and mixer

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TLDR
An aerator/mixer which includes a rotatable hollow drive shaft one or more air intake ports adjacent one end, and a propeller and an air permeable diffuser mounted adjacent to the other end is described in this paper.
Abstract
An aerator/mixer which includes a rotatable hollow drive shaft one or more air intake ports adjacent one end, and a propeller and an air permeable diffuser mounted adjacent to the other end; the diffuser is mounted below the propeller; and is in communication with the interior of the hollow drive shaft such that air supplied to the air intake port can exit only through the diffuser; the aerator/mixer further includes means for rotating the drive shaft and the propeller and means for supplying air at above atmospheric pressure to the or each air intake port.

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References
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Method for treating water

TL;DR: In this paper, a method for treating water is disclosed, which is applicable for the treatment of waste water within lagoons and ponds wherein the treatment is accomplished mainly through aeration.
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Float mounted aerator having a work deck

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TL;DR: In this paper, a mobile floatable shield is proposed to prevent the formation of vortices near an aerator propeller in a substance in which the propeller is driven.
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TL;DR: In this article, a mixing impeller is connected to the drive motor via a vertical shaft without gearing, and the ventilator coaxial to the mixing impellers is arranged above the drive motors, which is surrounded by a air transport pipe.