Method and system for the treatment of liquid effluents...

C - Chemistry – Metallurgy – 02 – F

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C02F 9/00 (2006.01) B01D 61/04 (2006.01) B01D 61/16 (2006.01) C02F 1/44 (2006.01) C02F 1/28 (2006.01) C02F 1/42 (2006.01) C02F 1/52 (2006.01)

Patent

CA 2517126

A method for the treatment and filtration of fluids, i.e. liquid effluents such as raw water containing organic pollutants in a solution, using gravity separation means (10) such as a decantation and flotation means, and membrane separation means (13) in a finishing stage, wherein a first pulverulent reagent (1) is introduced into the flow of a fluid to be treated upstream from gravity separation, and a second pulverulent reagent (2) is introduced downstream from the membrane separation. The inventive method is characterized in that the coagulant required for separation is injected before the first pulverulent reagent; in that the first and second pulverulent reagents (1,2) have different characteristics, i.e. in terms of granulometry, adsorption capacity adapted to the pollutants which are to be eliminated; and in that the second pulverulent reagent (2) is recycled from membrane separation means (13) upstream from the gravity separation means (10).

Procédé pour l'épuration et la filtration de fluides, notamment d'effluents liquides tels que de l'eau brute contenant des polluants organiques en solution et mettant en oeuvre des moyens de séparation gravitaire (10) tels que notamment décanteur et flottateur, ainsi que des moyens de séparation membranaire (13) en étape de finition, selon lequel on introduit un premier réactif pulvérulent (1) dans le courant du fluide à traiter en amont de la séparation gravitaire, et un deuxième réactif pulvérulent (2), en amont de la séparation membranaire, ce procédé étant caractérisé en ce que le coagulant nécessaire à la séparation est injecté avant le premier réactif pulvérulent (1), en ce que lesdits premier et second réactifs pulvérulents (1,2) présentent des caractéristiques différentes, notamment granulométrie, capacité d'adsorption adaptée aux polluants à éliminer, et en ce que ledit second réactif pulvérulent (2) est recyclé à partir des moyens de séparation membranaire (13) vers l'amont des moyens de séparation gravitaire (10).

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