Which equipment is designed to remove grit solids from wastewater before clarification?

• A. Grit screen.
• B. UV disinfection system.
• C. Aeration tank.
• D. Chlorination system.

Answer: (A)

Grit solids are dense inorganic particles like sand and gravel that can wear pumps and jammers and hinder sedimentation if they enter the treatment process. Removing them before the water reaches the clarifiers protects equipment and helps the downstream treatment operate more effectively. A grit screen is specifically designed to remove these gritty solids at the headworks, upstream of clarification, by screening out the abrasive material before the wastewater moves further through the treatment train. The other options serve different purposes: UV disinfection targets microorganisms after treatment, an aeration tank provides oxygen for biological treatment, and chlorination is another disinfection step. None of those remove grit, so the grit screen is the correct choice.