Dewatering of suspensions

B - Operations – Transporting – 01 – D

Patent

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B01D 21/01 (2006.01) C02F 1/56 (2006.01) C02F 11/14 (2006.01)

Patent

CA 2192388

A suspension is dosed with a coagulant and then with a flocculant and is dewatered to form a thickened sludge or cake and separated liquor, and control of the dewatering performance is improved by adding the flocculant at a predetermined dosage, monitoring the charge in the separated liquor (or monitoring other dewatering parameter of the separated liquor or suspension) and adding coagulant at a dosage selected in response to the monitored charge or other parameter value in order to maintain the value substantially at a preselected optimum value.

Une suspension est dosée avec un coagulant, puis avec un agent de floculation, et est égouttée afin de former une pâte épaissie ou gâteau et d'obtenir une liqueur séparée. On améliore la régulation de l'égouttage en ajoutant l'agent de floculation selon un dosage prédéterminé, en contrôlant la charge dans la liqueur séparée (ou en contrôlant d'autres paramètres d'égouttage de la liqueur séparée ou suspension), et en ajoutant un coagulant selon un dosage sélectionné en réponse à la charge contrôlée ou autre valeur de paramètre afin de maintenir la valeur sensiblement au niveau d'une valeur optimum présélectionnée.

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