Method and unit for the treatment of water by ballasted...

C - Chemistry – Metallurgy – 02 – F

Patent

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C02F 1/52 (2006.01) B01D 21/00 (2006.01) B01D 21/08 (2006.01)

Patent

CA 2453498

The invention relates to a method for treatment of water, permitting the physico-chemical treatment of water, including a ballasted flocculation stage using a granular ballast material with a density greater than water, followed by, a stage of gravity separation of the treated water and the flocculent mass, a stage of separation of the granular material, recycled for the flocculation stage and the muds. Said muds are sent to a stage for treatment of the muds, characterised in comprising a stage in which the functional mode passes from a mode using ballasted flocculation and gravity separation using coagulation and flocculation reagents to a mode functioning by simple gravity separation, without using coagulation and flocculation reagents. The passage from one mode to another is determined using at least one item of information on the water obtained at any stage of the treatment thereof or before said treatment.

L'invention concerne un procédé de traitement d'eau permettant le traitement physico-chimique de l'eau incluant une étape de floculation lestée d'un matériau granulaire de lestage plus dense que l'eau, suivie d'une étape de séparation gravitaire de l'eau traitée et des flocs, d'une étape de séparation du matériau granulaire recyclé à l'étape de floculation et des boues, lesdites boues étant envoyées vers une étape de traitement des boues, caractérisé en ce qu'il comprend une étape consistant à passer d'un mode de fonctionnement par floculation lestée-séparation gravitaire utilisant des réactifs de coagulation et floculation à un mode de fonctionnement par séparation gravitaire simple, sans utilisation de réactifs de coagulation et floculation, le passage d'un mode de fonctionnement à un autre étant déterminé à partir d'au moins une information concernant l'eau à une étape quelconque de son traitement ou avant son traitement.

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