Method for dewatering sludges

C - Chemistry – Metallurgy – 02 – F

Patent

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Details

C02F 11/12 (2006.01) C02F 1/36 (2006.01) C02F 9/00 (2006.01) C02F 11/14 (2006.01)

Patent

CA 2198241

The present invention relates to a method for removing water from sludges, such as sludges from woodhandling or community sewage treatment plants or the like biosludges, in order to make it possible to dewater these sludges mechanically to a high dry matter content, for instance by pressing at a high pressure. Such methods comprising following subsequent steps: coagulating (12), flocculating (14) and removing water mechanically (20) from the sludge by pressing. The method according to the invention further comprises an intense pretreatment step for the sludge prior to the removal of water from the sludge, in which intense pretreatment step the sludge is treated by physical or physical-chemical means by vigorously mixing the sludge and electrically ionizing (36) it or treating it with ultrasound, in order to activate the water bound to the sludge and to make the chemicals to be added to the sludge more effective.

Procédé destiné à éliminer l'eau contenue dans des boues, telles que des boues provenant de l'industrie du bois ou de stations d'épuration ou de boues biologiques analogues, qui permet de déshydrater ces boues mécaniquement pour obtenir une teneur élevée en matières sèches, par exemple en les pressant à une haute pression. Ledit procédé comprend les étapes suivantes: coagulation (12), floculation (14) et élimination mécanique de l'eau (20) des boues par pressage. Le procédé de la présente invention comporte en outre une étape de prétraitement intense de la boue avant l'élimination de l'eau. Lors de ladite étape de prétraitement intense, les boues sont traitées par des moyens physiques ou physico-chimiques consistant à mélanger la boue et à la ioniser (36) électriquement ou à la traiter aux ultrasons, afin d'activer l'eau liée aux boues et d'augmenter l'efficacité des produits chimiques ajoutés aux boues.

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