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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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