Modernized dewatering concept for challenging sludge
The PWTech Volute DUO (photo) adapts the original dewatering drum concept for more efficient dewatering of difficult sludges. When dewatered, sludges that contain a high concentrations of fibrous, inorganic or adhesive material can form a compacted cake that can be difficult to extrude from a traditional screw press. This can lead to clogging and may require reducing cake solids to avoid plugging. Utilizing twin counter-rotating screws inside a single drum to break up and move feed solids for dewatering, the DUO enables maximum cake solids without compromising performance. Using a separate drive mechanism — so that the moving rings do not contact the screws as they move — the DUO design also further reduces wear on the press, resulting in many years of maintenance-free operations. The DUO can be utilized in virtually all sludge dewatering applications. However, it is especially effective in applications that would otherwise create plugging or binding in more traditional screw press designs. Booth 1648 — Process Wastewater Technologies LLC, Rosedale, Md.