With the drying of biomass and organic fertilizers come the inherent risk of fires, explosions, VOC emissions (Volatile Organic Compounds) and fines. Biomass processing frequently involves material with high moisture content, a wide variety of particle sizes and strong odours. Energy-efficient fluid bed dryers facilitate high evaporation at low temperatures. For the heating of the thermal dryer , the waste heat is used from the CHP engines. Engine cooling water heat and motor exhaust gas are both re-used in the fluid bed dryer and creates a drying air flow of ~130-140 °C. Exhaust air from the dryer is handled in a bag house filter for dust removal, followed by a scrubber for VOC and odour removal.