Patent ID: 7169301

Claim:
Installation for water purification comprising a coagulation zone ( 1 ), a flocculation zone, a spillway baffle defining a zone for mixing having an upwardly open outlet, in an upward current, the flocculated water with pressurized water delivered by a pressurization-pressure release system, generating microbubbles, and means defining a flotation zone, in the upper part of which the suspended matter brought to the surface by the microbubbles is discharged, this flotation zone means comprising, a means for taking up the clarified water, located in the base of the flotation zone wherein: the geometry of the flotation zone means is such that the ratio of the height (H) of the zone as defined by the distance above the means for taking up clarified water to the top of the zone means to the length (L) of said zone means as defined by the distance between the spiliway baffle and the means for taking up clarified water at the base of the flotation zone between 0.3 and 1; and the ratio of the surface area (Sa) of the head of water above the outlet of the mixing zone to the surface area (Sp) of the flotation zone per se is between 0.05 and 0.5 between 0.1.