Rotary Drum Screen - Munson Machinery Co.

A new, compact Rotary Drum Screen from Munson Machinery removes solids from industrial and municipal waste streams, and recovers solid product from process streams, at rates from 600 to 2,790 gal/min (2,270 to 10,560 liter/min) without blinding or clogging the screen, while reducing floor space and headroom requirements compared with non-rotating equipment of equivalent capacity, according to the company.

The stainless steel unit, Model 24-RDS-72, is comprised of a 24 in. (61 cm) diameter x 72 in. (183 cm) long cylinder with durable wedge-wire screening, a variable speed drive, head box, discharge chute and support structure. Solids-laden effluent discharges from the head box and overflows a weir, flooding the entire length of the variable speed, rotating wedgewire drum screen. Solids deposited on the screen gravity-drain through slotted apertures to moisture levels in the 20 percent range before being removed by a doctor blade and chute.

Liquid passing through the screen falls onto an internal baffle that concentrates the flow, forming a full-length water knife that impinges against the underside of the screen, dislodging any solids trapped in apertures, even when handling oily, greasy, fibrous or resinous matter. A variable-speed drive allows adjustment of drum rotation speed to achieve maximum dewatering effectiveness. The wedge-wire screen of the cylinder is available in many orifice sizes from .002 to .110 in. (50 micron to 2.75 mm).