Q.

What is the minimum time of aeration?

A. 20 minutes
B. 40 minutes
C. 60 minutes
D. 80 minutes
Answer» C. 60 minutes
Explanation: the water is aerated for a period of no less than 60 minutes. if water flow is 50 m3/h the aeration level is 100m3/h of air and tank volume is 50m3 of water.
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