Civil Engineering MCQJE Level Civil Engineering
The filtration rate for a Rapid Sand Filter (RSF) is:
Environmental EngineeringEnvironmental EngineeringMEDIUM
Choose the correct answer
A
0.1–0.4 m/h
B
5–7.5 m/h
C
15–20 m/h
D
0.01 m/h
Correct Answer
B. 5–7.5 m/h
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RSF (gravity, pressure): filtration rate = 5–7.5 m³/m²/hour (5–7.5 m/h). Filter media: sand (600–700 mm thick, ES = 0.45–0.55 mm, UC < 1.7) + gravel. Cleaned by backwashing. RSF follows coagulation + flocculation + sedimentation in water treatment train.
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