High-speed tubular centrifuges are used mainly for separating solid components from fermenter suspensions. But this type of centrifuge can also be used to separate two liquids and remove a solid at the same time. The liquid is fed into the rotor from below while the centrifuge is running. The suspension components are stratified by density in the rotor. The liquid(s) is or are discharged continuously via the run-off tray. The solid remains in the rotor.