Question

Range of Displacement efficiency in the plain sedimentation tank is ___________

(a) 0.25-0.5

(b) 0.1-0.2

(c) 0.5-0.8

(d) 0.3-0.6

The question was asked in an interview for job.

Enquiry is from Design Elements of Sedimentation in portion Sedimentation of Environmental Engineering

Answer 1

The correct choice is (a) 0.25-0.5

The best I can explain: Displacement efficiency is defined as the ratio of flowing through period to the detention period and varies from 0.25 to 0.5 in the plain sedimentation tank.