What is the detention time considered while designing a primary sedimentation ta

Question

What is the detention time considered while designing a primary sedimentation tank which is followed by an activated sludge treatment tank?

Options:

A . 1 hr

B . 1.5-2.5 hrs

C . 3 hrs

D . 3-4 hrs

Answer: Option B
Answer: (b).1.5-2.5 hrs

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