Method for minimising the new water use in the water...

D - Textiles – Paper – 21 – B

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D21B 1/32 (2006.01) C02F 9/00 (2006.01) D21F 1/66 (2006.01) C02F 1/24 (2006.01) C02F 1/38 (2006.01) C02F 3/00 (2006.01)

Patent

CA 2387140

The invention relates to a method for minimising the new water use in the water circulation system of a treatment plant. The material to be treated is purified and/or disintegrated by means of water in a treatment step. The suspension containing the remaining components is subjected to mechanical purification and the mechanically purified suspension is separated into two process water streams. The first process waters stream is supplied back into the treatment step and the second process water stream is subjected to a chemical-physical clarification. The chemically-physically clarified process water stream is separated into two clear water streams. The first clear water stream is led into one of the two process water streams and/or into the suspension and the second clear water stream is subjected to a biological clarification. The biologically clarified clear water stream being a fresh water stream is led in one or two clear water stream/s. The ratio between the process water streams and the clear water streams has been determined before according to the material that is supplied to the treatment step and the kind of the mechanical purification and the kind of the chemical-physical clarification.

L'invention concerne un procédé permettant de minimiser l'utilisation d'eau d'apport dans un circuit d'eau faisant partie d'une installation de traitement. Selon ledit procédé, dans un étage de traitement, un nettoyage et/ou une désagrégation du matériau à traiter est réalisé avec de l'eau, la suspension contenant des composants résiduels est soumise à une purification mécanique, et la suspension purifiée mécaniquement est divisée en deux courants d'eau de processus, le premier courant d'eau de processus étant ramené à l'étage de traitement et le second courant d'eau de processus étant soumis à une clarification chimiophysique. Le courant d'eau de processus clarifié chimiophysiquement est divisé en deux courants d'eau claire, le premier courant d'eau claire étant introduit dans un des deux courants d'eau de processus et/ou dans la suspension et le second courant d'eau claire étant soumis à une clarification biologique. Le courant d'eau clair ayant subi la clarification biologique est introduit, en tant que courant d'eau fraîche, dans un courant d'eau claire. Le rapport des courants d'eau de processus aux courants d'eau claire est prédéterminé en fonction du matériau introduit dans l'étage de traitement, du type de la purification mécanique et du type de la clarification chimiophysique.

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