Screening of raw sewage is required for the __ of downstream treatment units and pumping units

• A. Efficiency
• B. Reliability
• C. Protection
• D. Aesthetics

Answer: (C)

Screening raw sewage serves as the first line of defense to protect downstream treatment and pumping equipment. By removing large solids and debris before they reach pumps and downstream units, it prevents damage to impellers and other machinery, reduces clogging and jam events, and minimizes wear from abrasive materials like grit. This protection helps maintain a steady, reliable flow and keeps downstream processes operating smoothly. While screening can also contribute to smoother operation, its primary purpose is safeguarding equipment and processes, not aesthetics or merely increasing efficiency.