A screen is a mechanical device used in wastewater treatment to remove large solids and debris from wastewater streams, preventing damage to downstream equipment and facilitating further treatment processes.

Types of Screens:

  1. Bar Screens: Use parallel bars to capture large debris.
  2. Rotary Drum Screens: Utilize rotating drums with fine mesh to filter solids.
  3. Step Screens: Consist of movable steps to trap solids.
  4. Fine Screens: Employ finer mesh or perforated plates to capture smaller particles.



  • Protects pumps, valves, and other equipment from damage.
  • Prevents clogging and blockages in downstream processes.
  • Improves overall treatment efficiency and performance.
  • Reduces maintenance requirements and downtime.
  • Helps maintain regulatory compliance by removing large pollutants.