Abstract: A method for cleaning oily waste including water, solids and at least one fuel oil includes removing water from the oily waste to be cleaned so as to produce dried oily waste; introducing dried oily waste into a two-phase centrifugal separator through a liquid inlet; separating the dried oily waste in the two-phase centrifugal separator into a cleaned oil phase and a sludge phase; discharging the sludge phase through a sludge outlet of the two-phase centrifugal separator, and discharging the cleaned oil phase through a liquid outlet of the two-phase centrifugal separator. A system for cleaning oily waste including water, solids and at least one fuel oil is also disclosed.

Abstract: In a centrifugal separator, the rotor of which has a separation chamber (7) with an inlet (16) for a liquid mixture, a constantly open central outlet (23) for a separated liquid and an intermittently openable peripheral outlet (13) for separated solids, a so-called displacement liquid is supplied to the separation chamber (7) before the peripheral outlet (13) is opened first at a certain flow rate and then at a substantially lesser flow rate. If displacement liquid is sensed in the separated liquid leaving the rotor through the central outlet (23), the peripheral outlet (13) is opened.