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Calculate the length of the rapid sand filter for the following details. Flow: 1000 m3/h. Velocity: 5m/h Backwash time: 30 mins

Calculate the length of the rapid sand filter for the following details. Flow: 1000 m3/h. Velocity: 5m/h Backwash time: 30 mins Correct Answer 1.9 m

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= 1000 × 24/ (5 × 24 × 23.5) =9 m2. Length: Breadth is in the ratio 1:3. Length = 1.7 m.

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