Civil Engineering MCQAE Level Civil Engineering
The normal filtration rate for a rapid sand filter (RSF) in water treatment is:
Environmental EngineeringRapid Sand Filter DesignMEDIUM
Choose the correct answer
A
0.1 to 0.4 m/h (slow sand filter rate)
B
100 to 150 litres/m2/hour (2.5 to 4 m/h)
C
500 m3/m2/day
D
1 m/h
Correct Answer
B. 100 to 150 litres/m2/hour (2.5 to 4 m/h)
Why is this the answer?
Rapid sand filter (RSF): filtration rate = 100-150 L/m2/h (about 2.5-4 m/h, 60-100 m3/m2/day). Much faster than slow sand filter (0.1-0.4 m/h). RSF requires coagulation and sedimentation before filtration. Backwashing at 600-900 L/m2/h to clean the filter.
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