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Question

A town has an existing horizontal flow sedimentation tank with an overflow rate of 17 m3/day/m2, and it is desirable to remove particles that have a settling velocity of 0.1 mm/sec. Assuming the tank as an ideal sedimentation tank, the percentage of particles removal is approximately equal to

A
30%
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B
90%
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C
50%
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D
70%
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Solution

The correct option is C 50%
Given surface overflow rate

V0=17 m3/day/m2

V0=17×10324×60×60

=0.196 mm/sec

η=VsV0×100=0.10.196×100

=50.82%50%

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