Patent ID: 9095826
Filing Date: 2015-08-04
Classification: B01F,C02F,Y02W

Abstract:
1. Apparatus for stirring a body of wastewater or mixed liquor in a tank, wherein: the apparatus includes a liquid-inlet, for conveying liquid to be treated into the tank, and includes a liquid-outlet, for conveying treated liquid out of the tank; the body of liquid includes floatable solids and settleable solids; the apparatus includes a liquid delivery pipe, and a powered pump for pressurizing and conveying a flow of liquid along the pipe; a downstream-end of the pipe is formed with a nozzle or other ejector; the apparatus is arranged so that the pressurized liquid emerges through the ejector as a nozzle-jet, and enters the body of liquid in the tank; the nozzle-jet is powerful enough, in relation to the tank, to establish a circulation-stream of the body of liquid in the tank, including: (a) to establish a nozzle-jet stream, which plunges down from the ejector towards the floor of the tank, carrying with it an entrainment of floatable solids from the liquid surface, and which reaches the floor with enough power to agitate, and to entrain, the settleable solids into the circulation stream, thereby creating a down-to-the-floor-stream component of the circulation-stream; (b) to continue the circulation-stream then outwards with respect to the ejector, along the floor of the tank, thereby creating an out-across-the-floor-stream component of the circulation-stream; (c) to continue the circulation-stream then upwards, towards the surface, thereby creating an up-towards-the-surface-stream component of the circulation-stream; (d) to continue the circulation-stream then inwards along the surface, towards the ejector, thereby creating an in-across-the-surface-towards-the-nozzle-stream component of the circulation-stream; (e) to keep the liquid moving continuously in the circulation-stream, being a steady continuing circulation and recirculation around the tank; (f) to ensure that substantially the whole body of liquid in the tank, and substantially all the floatable and settleable solids, are included in, and carried around with, the circulation-stream; and (g) to establish the said circulation-stream substantially entirely from the power of the nozzle-jet, without the need for assistance from a powered mechanical flow-creator located below the surface of the body of water; and the tank is so dimensioned and configured as to contain and promote the circulation-stream established by the ejector.