The Rotary Drum Thickener (RDT) from BDP Industries is a simple machine with a track record of thickening various water, wastewater and industrial sludges. With its compact design, trouble-free operation and enclosure for odor control, it is an ideal option for many thickening applications. The same fundamental design of an internally baffled, center shaft support has been manufactured since 1978. Features added or improved upon include a sealed first compartment for increased flocculation time, trunnion supports on the center shaft keeping them away from the process fluid, and dual drum design for high flows. 518/695-6851; www.bdpindustries.com; Booth 4231