An apparatus for processing solid waste products, comprising (a) a rotatably mounted cylindrical vessel having a first end and a second end, at least one of the ends terminating in an opening to allow access to the interior of the vessel and to sealably close the vessel to allow pressurization thereof, adapted to move between an operating position and loading-discharge position wherein the first end is higher than the second end, (b) a door adapted to sealably close the vessel at least one end, the door adapted to be completely separated from the vessel, (c) a steam inlet for injecting steam into the vessel, (d) an actuator for moving the vessel between an operating position and a loading-discharge position wherein the first end is higher than the second end, and (e) a respective attachment portion adapted to attach each door to the vessel