Updated: July 2002

1. Purpose

The disc screen in designed to prevent flow of large solid wastes harmful for pumps and transport small solid wastes to the downstream side, thereby reducing the amount of solid wastes discharged at the pumping station.

2. Construction and Operation

The disc screen is a horizontal rotor shaft equipped with evenly spaced steel discs. The rotor shaft is fixed on the surface of the stream at the right angle to the stream and the upper semicircle of the disc is rotated in the water flowing direction. Small solids pass through the clearance between discs with water flow to the downstream side. The solids adhering to the disc are conveyed to the downstream side by the rotation of the disc and continuously removed from the disc by the water flow.
Large solids are prevented from flowing by the discs and retained at the upstream side. When the collected wastes increase, those are removed out as required.

3. Features

The simple and compact solid removal, achieving labor and power saving.
Elimination of parts such as rakes and wipers ensures operation free of trouble caused by being caught in between or twining of foreign matters, and also elimination of ancillary equipment results in easy handling, easily automating operation by linking the disc screen with lift pumps.
Because only the rotation of the discs at low speed is required, the power consumption is minimized.
The opening can be easily sealed to control odor problems.