Patent ID: 8480907
Filing Date: 2013-07-09
Classification: C02F

Abstract:
1. A method for the clarification of water difficult to treat by flotation, in particular polluted surface water, or municipal or industrial wastewater, rainwater and all types of water difficult to treat by flotation, in particular having a high percentage of mineral matter, or for the clarification of all types of water requiring the injection of a flocculation aid and preceding filters or membrane technologies such as ultrafiltration, comprising: a coagulation step (A a flocculation step (B) during which a flocculant ( a flotation step (C) during which, in a flotation apparatus, the flocculated water is mixed with an emulsion of gas microbubbles, generally air microbubbles, which become attached to the flocs and make them rise to the surface, where they are collected and removed, while the clarified water is removed via the bottom of the flotation apparatus.