Patent ID: 7087175
Filing Date: 2006-08-08
Classification: C02F

Abstract:
1. Method of separating suspension for treatment of waste water, comprising introducing the suspension including wastewater into a separator containing a fluidized sludge blanket wherein a flocculating suspension is separated from a liquid including said wastewater by filtration in a fluidized layer of a sludge blanket wherein flocks are created from separated suspension and fluidization is maintained by a rising stream of liquid, while liquid with suspension enters the fluidized layer from the bottom and the liquid freed from suspension is discharged above the surface of the sludge blanket represented by an interface between the fluidized layer and the liquid without suspension, and velocity of upward flow in the fluidized layer decreases essentially in the upward direction, wherein there is formed an upper partially fluidized sludge blanket and bottom fully fluidized sludge blanket, wherein the partially fluidized sludge blanket agglomerates of thickened suspension are established which move downward along an inclined boundary resulting in a concentration of the thickened suspension into density streams which are withdrawn, and in the fully fluidized sludge blanket liquid flow is distributed into the partially fluidized sludge blanket, excess thickened suspension being withdrawn along an inclined side boundary of the fully fluidized sludge blanket.