Question

A city is going to install the rapid sand filter after the sedimentation tank. Use the following data:
Design loading rate to the filter = 200 $m^3/m^2/d$ ;
Design now rate = 0.5 $m^3/s$
Surface area per filter box = 50 $m^2$
The surface area required for the rapid sand filter will be

• A. $218m^2$
• B. $216m^2$
• C. $210m^2$
• D. $215m^2$

Answer 1

The correct option is B $216m^2$

Surface area required

$=\frac{\text{Design flow rate}}{\text{loading rate}}$

$=\frac{0.5\times 86400m^3/d}{200m/d}$

$=216m^2$