Water treatment installation by ballasted flocs and degreasing

C - Chemistry – Metallurgy – 02 – F

Patent

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Details

C02F 1/52 (2006.01) B01D 17/02 (2006.01) B01D 21/00 (2006.01) C02F 1/38 (2006.01) C02F 9/00 (2006.01) C02F 11/00 (2006.01) C02F 1/40 (2006.01) C02F 11/12 (2006.01)

Patent

CA 2432826

The invention concerns the use of a coagulation-flocculation-decantation device for water treatment to degrease water inside the device itself so as to eliminate therefrom more than 20 % of hexane-extractable matter without resorting to separate degreasing means by flotation. The invention also concerns a plant comprising a coagulation-flocculation-decantation device by ballasted flocs having a coagulation zone (1), means supplying (4) a granular material denser than water (4), a flocculation zone (6), a decantation zone (8) and means for recycling (15) granular material including at least a hydrocyclone (17). The invention is characterised in that it does not comprise degreasing means provided upstream of the coagulation-flocculation-decantation device, the grease being removed from the water inside the coagulation- flocculation-decantation device itself without means for injecting air or an equivalent gas.

L'invention propose d'utiliser un dispositif de coagulation-floculation-décantation pour le traitement des eaux pour dégraisser celles-ci au sein même du dispositif de façon à en éliminer plus de 20 % des matières extractibles à l'hexane sans avoir recours à des moyens distincts de dégraissage par flottation. L'invention concerne aussi une installation comprenant un dispositif de coagulation-floculation-décantation par flocs lestés présentant une zone de coagulation (1) des moyens d'amenée (4) d' un matériau granulaire plus dense que l'eau (4), une zone de floculation (6), une zone de décantation (8) et des moyens de recyclage (15) de matériau granulaire incluant au moins un hydrocyclone (17) caractérisée en ce qu'elle ne comprend pas de moyens de dégraissage prévus en amont du dispositif de coagulation-floculation-décantation, le dégraissage desdites eaux étant assuré au sein même du dispositif de coagulation-floculation-décantation sans moyens d'injection d'air ou de gaz équivalent.

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