Self-Cleaning Rotary Drum Screen

This self-cleaning rotary drum screen separates solid debris from wastewater at high rates while using little energy. It contains a rotating cylinder constructed of wedge-wire screen with a stationary blade (called a doctor blade) on the outside of the cylinder and an internal spray line. Effluent from a head box overflows a dam and flows onto the outside of the rotating cylinder. This allows water to pass through the wedge wire into the cylinder, where the doctor blade scrapes sludge and debris collected on the outside of the cylinder and an internal spray line dislodges particles blinding the screen. The separator is suitable for use in sewage treatment, pulp-and-paper, pelletizing, and many other applications that require solids to be removed from high-volume slurries. Containing few moving parts and taking up little floor space, the separator also has low investment, operating and maintenance costs. Available models include 24-in.-dia. drums with lengths of 24, 36, 48, 50 and 72 in., and 36-in.-dia. drums with 96- and 120-in.-lengths. Capacities range from 200 to 1,000 gal/min.