The Dehydris Twist is an advanced sludge dewatering process from Degremont, employing the Bucher Unipektin hydraulic piston press technology. Up to 30% reduction in sludge bulk volume can be achieved over conventional dewatering and digested sludge can be dewatered to autothermal conditions before incineration. The versatile process accepts both drinking water as well as wastewater sludge and has been successfully put to use in over 2,000 systems worldwide.