In the design of a continuous flow type sedimentation tank, if A= theoretical detention period and B= the actual average time is taken by a batch of water in passing through the settling tank, then what will be the displacement efficiency?

Question

Question

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HPCL Engineer Civil 11 Aug 2021 Official Paper

Answer 1

Concept:

Displacement Efficiency:

It is the ratio of flowing through the period to the detention period.

\(Displacement\space Efficiency = {Flowing \space through \space the\space period \over Detention\space period}\)

Explanation:

Given Data

Theoretical detention period = A

The actual average time is taken by a batch of water in passing through the settling tank = B

So, \(Displacement\space Efficiency = {Flowing \space through \space the\space period \over Detention\space period}= {B\over A}\)