Device for continuous separation of solid particles from a liquid suspension

Claim 1

Device for continuous separation of solid particles from a liquid suspension, comprising a tank with a separator space, into which an inlet leads for the liquid suspension containing solid particles, said space having firstly a primary separation zone where the larger solid particles can precipitate to a bottom portion of the tank, and secondly a secondary separation zone located downstream of the primary zone and containing a lamella separator unit for further separation of solid particles from the liquid flow on its way towards an outlet, the lamella separator being arranged so that the particles caught therein can also precipitate to the bottom portion of the tank, said device also comprising a means for feeding out the solid particle sludge collected on the bottom portion of the tank, said tank having a substantially horizontal bottom portion, located under the lamella separator unit and the secondary separation zone, and an inclined portion located under the primary separation zone, said feed-out means comprising an endless scraper conveyor which has a portion running along the horizontal bottom of the tank and a portion running along the inclined portion, transverse scraper elements on the conveyor being arranged to slowly push the sludge along the bottom and inclined portions up above the liquid surface in the tank and there dewater the sludge before it is fed out through an outlet located higher up, said inlet leading into a distributor drum arranged to direct the incoming liquid suspension up toward the region of the primary separation zone of the tank where the scraper conveyor emerges from the liquid surface in the tank.