Abstract: Incinerator having a primary and a secondary combustion chamber, the primary combustion chamber has a bottom section and a top section, both provided with burners and air injection devices. The wall of the top section has a sluice port for introducing a barrel, and within the top section there is provided a barrel holder for receiving and holding such a barrel. The barrel holder is mounted for rotation about a horizontal axis and can be operated for turning the barrel from upright to fully or partly inverted position and vice versa. Burning of the waste may take place either in the barrel in upright position, or upon turning of the barrel and dropping of its contents into the bottom section, or a combination of both. Thereby optimum conditions may be created for incineration of waste of varying consistency, ranging from liquid to solid, and no manual handling of barrels or their contents is required.