Patent ID: 7261279
Filing Date: 2007-08-28
Classification: B01F,C02F,Y02W

Abstract:
1. A device for stirring and aerating a liquid in a treatment vessel, comprising: at least one funnel adapted to be disposed in the upper portion of said vessel and forming with said vessel a passage, at least one duct connected to said funnel and adapted to extend in the direction of the bottom of said vessel, said duct including at least one opening in each of its upper and lower portions, at least one main screw situated in said duct, a device that drives rotation of said screw, and a device that incorporates air into said liquid, wherein: said air incorporation device comprises, in addition to the upper edge of said funnel, an annular member inside said funnel in the vicinity of the upper edge of the funnel, so as to incorporate air at atmospheric pressure into said liquid entirely because of the effect of the movement of said liquid.