Step Screens

The Johnson Screens^® Step Screen is suited primarily for the screening of sewage; it is typically installed in a channel at an inclination of 30 to 40 degrees. 

The step screen consists of a series of stationary and mobile steps alternating with each other. As the effluent flows through the step screen, a screening mat develops along the surface of the screen. The mobile steps progressively lift the mat of solids along the inclination of the screen. On reaching the top of the step screen, the solids are discharged by gravity into a screw conveyor or similar device. The low-inclination angle ensures that a screening mat is retained continuously during the entire operation and prevents the roll down encountered in steeper screens.

A consistent screening mat contributes to a uniform and high-solids capture rate. The Johnson Screens step screen is capable of handling flows of up to 23,775 gpm / 5,400 m³/hr through a single unit.

For more information on Step Screens please contact us.