What is the retention time considered for the aerobic zone for the A2O process f

Question

What is the retention time considered for the aerobic zone for the A2O process for removing phosphorus?

Options:

A . 0.5-1.5 hrs

B . 1.5-3 hrs

C . 3-4 hrs

D . 4-8 hrs

Answer: Option D
Answer: (d).4-8 hrs

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