Wock-Oliver’s screw press is a dewatering screw press that separates the liquid from the solids. The screw press works in a similar to the Archimedes’ screw as the sludge travels in the direction of the rotating screw. In this process the absorbed liquid filtrate (mostly water) is drawn out of the sludge and the remaining sludge becomes solid and dried through this process. The screw propagates the sludge till the end where it exists into the discharge chamber in a form ofdehydrated solid sludge known as “sludge cake”.