H Hydrotech Beltfilter The Hydrotech Beltfilter is made for efficient filtration and draining of sludge and wastewater. Sludge treatment Hydrotech Drumfilter Patented mechanical self-cleaning drumfilter for municipal and industrial recovery water applications. Filtration S STRUVIA™ Struvia technology has been developed by Veolia Water Technologies to facilitate the recovery, the valorisation and the reuse of phosphorus contained in wastewater and in concentrated industrial water. Wastewater Sidestream Treatment