The thickened and digested sludge is pumped to the Centrifuge for dewatering. The centrifuge spins at 3600 RPM which seperates the solids from the water. Adding a polymer assists with this separation. The clean water flows out of one end of the machine and the solids are moved by an auger inside the machine to the other end. The solids fall into a truck for hauling to Climax Mine where the solids are composted and used for revegetation. Andritz