Patent ID: 8387957

Claim:
A gas injected downflow mixer for use in a tank or basin for containing a fluid, said mixer having a draft tube with an upper end having a fluid intake and with an unobstructed lower end below the upper end forming a discharge end, comprising; a propeller or impeller housed within said draft tube between said fluid intake and said discharge end; a gas source; a gas injection device attached to said unobstructed lower discharge end of said draft tube below said propeller or impeller, said gas injection device including an injector body having injection ports below said propeller or impeller and discrete flow disruptors along a lower end of the injector body, a gas distribution manifold attached to said injector body to distribute said gas to said injection ports, and at least one gas inlet port to supply said gas to said manifold from said gas source wherein said fund contained in said tank or basin is mixed by said mixer.