SSC JE Civil Engineering 23-Mar-2021 Shift 1 Paper

Question : 125 of 200

Marks: +1, -0

Select the correct statement with respect to a slow sand filter.

The rate of filtration is in the range of 100-150 $\m^3$ / $\m^2$ /day.
The effective size of sand particles shall be 0.15 to 0.3 mm, and their uniformity coefficient shall be preferably below 3.
Backwashing daily or on alternate days is necessary for cleaning.
The filtering medium has effective size 0.45 to 0.7 mm, uniformity coefficient 1.3 to 1.7, multiple graded layers of sand with bacteria and odour removal.

Solution:

Rate of filtration = 100

\m^3

\m^2

/ day = 4166.67 lph/sq.m

Go to Question:

Prev Question

Next Question