For dewatering of reject from the paper industry or foodwaste from food industry the RUNI screw compactor is very suitable. Before paperwaste can be transformed to recycling paper all unwanted material must be sorted out. This very water containing reject is both expensive to transport and to dispose of, but after compacting and dewatering in the RUNI screw compactor it can now go to incineration at a much lower cost. Foodwaste can also be dewatered in the RUNI screw compactor. The liquid part can be used for biogas and the solid part can be send to incineration. This process reduces weight with 50%.