The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is
A. 30 minutes
B. 1 hour
C. 1 hour and 30 minutes
D. 2 hours
Answer: Option D
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D.T = depth of tank / Vs of partical.
= 2.4m and .33 mm/s velocity,
( it's not .33 m )
= 2400/.33.
= 7272.72sec.
= 2 hour.