In the continuing design of Laramie’s rapid sand filter ( Problems 8-12 , 8-13 and 8-17 ), determine the area of each filter cell and the plan dimensions of a filter box. Assume a gullet width of 0.8 m.
Problems 8-12
The rapid sand filter being designed for Laramie has the characteristics shown below. Using the Rose equation, determine the headloss for the clean filter bed in a stratified condition.
Problems 8-13
Determine the maximum backwash rate and the height of the expanded bed for the sand used in Problem 8-12.
Problems 8-17
Determine the number of filter beds for Laramie ( Problem 8-12 ) if the maximum day design flow rate is 55,000 m3/d.
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