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In a fill and draw type sedimentation tank, a detention period of ____ hours is provided.

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In a fill and draw type sedimentation tank, a detention period of ____ hours is provided.

(a) 6

(b) 12

(c) 18

(d) 24

I had been asked this question in final exam.

This intriguing question comes from Types of Settling Tanks topic in portion Sedimentation and Chemical Clarification of Environmental Engineering

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Best answer
Right choice is (d) 24

The explanation is: In this tank, water is detained for 24 hours. Then cleaning is done for 6-12 hours, so, the whole operation takes 30-36 hours.

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