Royal GMF-Gouda specializes in equipment for the environmental industries. The most important environmental machine at this moment, is the GMF-Gouda Paddle dryer, a machine used to heat treat sludge and other products in a full-continuous process. Many waste water treatment plants are coping with a waste stream of digested sludge. This sludge is normally dewatered by means of a centrifuge or belt filter press. After dewatering the sludge has a typical dry solid content of 20 -25%, which is very suitable for thermal treatment in a GMF-Gouda Paddle dryer.