Method for the floatation-clarification of difficult water and facility for implementing same
US8480907B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 4, 2007 |
| Grant date | Jul 9, 2013 |
| Priority date | — |
| Expiry date | Jul 13, 2030 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F1/56
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
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 (A1) in which a dose of coagulant (1) is injected into the water to be treated; a flocculation step (B) in which flocculant (2) is injected (B1) 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 (A2) is performed downstream of the flocculant injection (B1) and upstream of the floatation (C).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.