Flotation device

A flotation device comprising:

• a flotation tank for receiving liquid to be purified to form purified liquid;
• a saturator for receiving a pressurized liquid-gas mixture;
• a plurality of feeders mounted on an outer wall of the flotation tank, each feeder comprising a Venturi nozzle disposed exterior to the flotation tank;
• and
• a line leading from the saturator to the feeders through which the pressurized liquid-gas mixture is introduced into the flotation tank, the line extending at least partially around the flotation tank and opening into the feeders without interposition of valves;
• and
• a plurality of injector lances connected to the feeders, respectively, the injector lances projecting into an interior of the flotation tank;
• a first tank connected to the flotation tank to receive purified liquid from the flotation tank;
• a second tank connected to the first tank to receive overflow of purified liquid from the first tank;
• and
• a pump for pumping purified liquid from the first tank to the saturator, where compressed air is applied to the purified liquid;
• wherein ends of the injector lances projecting into the interior of the flotation tank are spaced from convex baffle plates, respectively, the baffle plates having convex sides facing the ends of the injector lances such that when the liquid-gas mixture exits the ends of the injector lances and strikes the baffle plates, outgassing gas is distributed into fine bubbles;
• wherein each feeder comprises a flow channel that has different flow cross sectional areas along the extension thereof;
• and
• wherein no valve is connected between the line and the interior of the flotation tank.