Method and plant for thickening sludge derived from water...

C - Chemistry – Metallurgy – 02 – F

Patent

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Details

C02F 11/14 (2006.01) C02F 1/52 (2006.01) C02F 9/00 (2006.01) C02F 1/20 (2006.01) C02F 1/38 (2006.01)

Patent

CA 2433226

The invention concerns a method for thickening sludge derived from a water treatment plant by flocculation-decantation with floc ballasted with micro- sand or other dense granular material using a liquid cyclone treatment (1) of the decantation sludge. The invention is characterised in that it comprises successive steps which consist in: degassing (3) the overflow sludge of the liquid cyclone treatment (1) from the ballasted flocculation-decantation unit, said degassing step being carried out on a corresponding degassing surface at a degassing surface velocity of less than 100 mph; injecting at least a flocculating reagent (4) into said sludge; and thickening said sludge in at least a laminar sludge thickener (6), with a stilling floor load calculated at the thickener floor surface higher than 200 kg of suspended matter per m2 per day and the extracted sludge concentration higher than 10 g/l.

L'invention concerne un procédé d'épaississement des boues issues d'une unité de traitement d'eau par floculation décantation à floc lesté de micro-sable ou autre matériau granulaire dense mettant en uvre une étape d'hydrocyclonage (1) des boues de décantation, caractérisé en ce qu'il comprend les étapes successives consistant une étape de dégazage (3) des boues de surverse de l'hydrocyclonage (1) de l'unité de floculation décantation lestée, ladite étape de dégazage étant mise en uvre sur une surface de dégazage correspondant à une vitesse superficielle de dégazage de moins de 100m/h ; une étape d'injection d'au moins un réactif de floculation (4) dans lesdites boues ; et une étape d'épaississement desdites boues dans au moins un épaississeur lamellaire (6), avec une charge au radier calculée sur la surface du radier de l'épaississeur supérieure à 200 kgMES/m2/jour et la concentration de boues extraites supérieure à 10 g/l.

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