Grit chambers are provided
- Abefore the screens
- Bafter the equalization tank
- Cbefore the primary sedimentation tankCorrect
- Dbefore the sludge digestion tank
Solution
Concept
Position of grit chamber
Step-by-step solution
1. Sequence: screens → grit chamber → primary sedimentation. 2. Grit is removed before the primary tank to protect pumps and avoid settling in the tank.
Explanation
Sequence: screens → grit chamber → primary sedimentation.
Why the other options are wrong
Grit chambers come after screens, not before.
Shortcut
Screen → grit → primary.
Correct answer: C) before the primary sedimentation tank