What is the detention time considered for the contact zone while designing the c

Question

What is the detention time considered for the contact zone while designing the conventional dissolved air floatation process?

Options:

A . 1-2.5 mins

B . 2.5-4 mins

C . 4-9 mins

D . 9-15 mins

Answer: Option A
Answer: (a).1-2.5 mins

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