Waste-activated sludge treatment methods and apparatus

Details Waste-activated sludge treatment methods and apparatus Waste-activated sludge treatment methods and apparatus

C - Chemistry, Metallurgy

02

F

C02F 11/00 (2006.01) B09B 3/00 (2006.01) C02F 11/14 (2006.01)

Patent

CA 2650593

A method for treating waste-activated sludge comprises adding (1) a pozzolanic material to waste-activated sludge to form a mixture. The mixture is homogenized and aerated (2). The pozzolanic material reacts with the waste-activated sludge. The mixture is allowed to settle (3). A portion of the mixture is recirculated (4) from a downstream location to an upstream location. The recycled mixture includes pozzolanic material. Some embodiments provide advantages over existing wastewater treatment methods which may include: reduction or elimination of unpleasant odours, reduction of overall costs, conversion of waste into useful products, and/or reduction or elimination of discharged bacteria or other undesirable materials.

L'invention concerne un procédé de traitement d'une boue activée par déchets, comprenant l'ajout (1) d'un matériau pouzzolanique à une boue activée par déchets pour former un mélange. Le mélange est homogénéisé et aéré (2). Le matériau pouzzolanique réagit avec la boue activée par déchets. Le mélange est laissé sédimenter (3). Une partie du mélange est remise en circulation (4) entre un emplacement aval et un emplacement en amont. Le mélange recyclé comprend du matériau pouzzolanique. Certains modes de réalisation présentent des avantages en comparaison de procédés existants de traitement des eaux usées, ces avantages notamment : réduction ou élimination des odeurs désagréables, réduction des coûts globaux, transformation des déchets en produits utiles et/ou réduction ou l'élimination des bactéries ou autres matériaux indésirables.

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