Abstract: Method and apparatus for pulping and grading waste paper in which stock is introduced through a central inlet in one end wall of a cylindrical chamber and accepts are discharged through a perforate screen in the opposite end wall. An impeller in the chamber adjacent the perforate screen provides for pulping and pumping of the stock as well as provides rotational movement of the stock within the chamber. Light rejects are continuously removed through an outlet adjacent the wall containing the perforate screen while heavy rejects are removed through an outlet adjacent the inlet wall.

Abstract: Method and apparatus for pulping and grading waste material in which the waste material is introduced into a cylindrical chamber having two end walls with a perforate screen in one of the end walls. An impeller in the chamber adjacent the perforate screen provides for pulping and pumping of the stock as well as provides rotational movement of the stock within the chamber. Lightweight rejects are continuously removed through an outlet centrally located in the end wall opposite the screen and heavy rejects are removed through an outlet in the cylindrical wall adjacent the end wall opposite the screen. The stock is introduced to the chamber through an annular inlet which surrounds and is coaxial with respect to the lightweight rejects outlet line.

Abstract: Method and apparatus for separating and washing solid particles in suspension in a liquid which includes a series of continuously decanting centrifuges and an equal number of reslurry stations. Fresh wash liquid is introduced into the last of the reslurry stations, together with solids which are discharged from the next to last decanting centrifuge. Solids are separated from liquid in the last decanting centrifuge and the effluent therefrom is directed into the next to last reslurry station for dilution of the suspension therein. The system is particularly adapted for use as a continuous lautering method for producing malt beverages.