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A water treatment plant has five identical rapid sand filters. Each is square in plan and...

A water treatment plant has five identical rapid sand filters. Each is square in plan and has a capacity of 1 MGD. The application rate is to be 4 gal/min-ft2 and the total wetted depth is 10 ft. Each filter will be backwashed every day for 5 min. The rate of rise of the backwash water is 2 ft/min.

A) What should be the cross-section dimensions of each filter?

B) What percentage of the plant's filtered water will be used for backwashing?

Engineering   Civil-Engineering   
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