Patent ID: 7175768
Filing Date: 2007-02-13
Classification: B01D,B03D,C02F

Abstract:
1. A method for clarifying, by flotation, waters contaminated with suspended matter, wherein the clarification treatment takes place in two successive steps implemented in a single installation: flowing contaminated water through a downflow static flocculation step, and then down through a lamellar settler separation step positioned directly below the downflow static flocculation step; the lamellar settler separation step removes heavier particles from the water; the settling rates of the heavier particles retained during this static flocculation/lamellar separation step being less than or equal to the settling rates of floatable particles in the water and subjecting the water, which has passed through the static flocculation/lamellar settler separation step to; a flotation step which removes the light particles of which the settling rate is lower than the flotation cutoff threshold.