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Calculate the area of the rapid sand filter for the following details. Flow: 2000 m3/h. Velocity: 5m/h Backwash time: 30 mins

Calculate the area of the rapid sand filter for the following details. Flow: 2000 m3/h. Velocity: 5m/h Backwash time: 30 mins Correct Answer 18 m2

The total operation time equals 24 minus the back wash time. Area equals Flowrate × total hours of operation/ [velocity × total hours of operation × (total hours of operation-backwash time). Area= 2000 × 24/ (5 × 24 × 23.5) =18 m2.

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Assertion A: Slow sand filters are more efficient in removal of bacteria than rapid sand filters.
Reason R: The sand used in slow sand filters is finer than that in rapid sand filters
Select your answer based on the coding system given below: