The rotary drum thickener from Veolia Water Solutions & Technologies North America consists of an enclosed cabinet in which a drum is suspended and rotates by means of an adjustable gear motor. The drum is built of a skeleton onto which windings have been welded, and a filter cloth made of polyester is fastened around the skeleton. The nozzles for cleaning of the filter cloth are installed on a pipe that, without use of tools, can be taken out for inspection and cleaning while wash water can be used for cleaning of the drum. It can be used for concentration of sludge before digesters, for replacement of concentration tanks for both primary and biological sludge, for an increase of the dry-solids capacity at the final dewatering plant, or as the sole thickener at plants where a high-dry solids content is not required. 919-677-8310; www.veoliawatertech.com