Degremont

Céline Broutin

Patrick Vion

Christian Garriou

The invention relates to a method for the floatation-clarification of difficult water, in particular heavily polluted surface water, urban or industrial wastewater, rainwater or any type of water that floats with difficulty, particularly water which contains a high percentage of mineral matter or requires the injection of a flocculation aid and which originates from filters or membrane technologies such as ultrafiltration, said method comprising: a coagulation step (A) in which a dose of coagulant () is injected into the water to be treated; a flocculation step (B) in which flocculant () is injected (B) into the water after the coagulation step, in order to agglomerate the suspended particles in the form of flocs; and subsequently a floatation step (C) in which the flocculated water is mixed with an emulsion of air micro-bubbles in a floatation apparatus. A second coagulant injection step (A) is performed downstream of the flocculant injection (B) and upstream of the floatation (C).

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Colombes, France

Céline Broutin