The bar screen you asked about is essentially the "coarse screen" used in wastewater treatment. Its core working principle is physical interception-a set of parallel bars blocks large solids in the wastewater, allowing water and small particles to flow through, thus protecting downstream pumps and pipelines.
Working Principle
Interception: When wastewater flows through the bar screen, large solid debris is blocked.
Cleaning: Debris on the bar screen is periodically removed manually or with a mechanical rake to maintain smooth water flow.
Main Types
Manual Bar Screen: Relies on manual cleaning; suitable for low-flow applications.
Mechanical Bar Screen: Automatically cleans; suitable for medium to large-scale wastewater treatment plants; more efficient.
Key Functions
Protects downstream equipment (such as pumps and aerators) from clogging or damage.
Reduces the load on downstream treatment units and improves overall efficiency.
Design Parameters
The bar spacing (grid pitch) is crucial; common sizes include 10mm, 20mm, and 30mm, selected based on the influent water quality and subsequent treatment requirements.
