Method and installation for clarifying liquids and...

C - Chemistry – Metallurgy – 02 – F

Patent

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Details

C02F 1/52 (2006.01) B01D 21/00 (2006.01) B01D 21/08 (2006.01) B01D 21/24 (2006.01) B01D 21/32 (2006.01) C02F 1/56 (2006.01)

Patent

CA 2392916

The invention concerns a method characterised in that it comprises two recycling modes: one high energy operating mode, for extracting the ballast contained in the ballast-floc agglomerate and so, in particular for separating the sand from the sludge, eliminating the floc in the form of sludge and recycling the cleaned ballast to flocculation; a low energy operating mode for transferring the ballast-floc agglomerate to the flocculation step as long as the proportion of ballast in the flocculator is higher than a predetermined level, said low energy operating mode being maintained activated when the high energy mode is started, but stopped while the high energy mode is operating, the two systems being alternately operated so as to maintain the proportion of ballast at a predetermined level.

Ce procédé est caractérisé en ce qu'il comporte deux régimes de recirculation: un régime à forte énergie, assurant l'extraction du lest contenu dans le floc- lesté et donc, notamment la séparation du sable d'avec les boues, l'élimination du floc sous forme de boues et le recyclage du lest nettoyé vers la floculation et, un régime à faible énergie assurant le transfert du floc- lesté vers l'étape de floculation tant que le taux de lest dans le floculateur est supérieur à un niveau prédéterminé, ce régime à faible énergie restant en service lors de la mise en action du régime à forte énergie, mais étant ensuite arrêté pendant le fonctionnement du régime à forte énergie, les deux systèmes étant mis en oeuvre de façon alternée de manière à maintenir le taux de lest à un niveau prédéterminé.

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