Design rapid sand filters for a water treatment plant to treat a flow rate of 25...

Design rapid sand filters for a water treatment plant to treat a flow rate of 25 mgd. Use 1.5 for a peak factor. Consider the location of overflow troughs, freeboard, and pressure head of water. Assume that the length of the filters is 2 times the width and that the filtration rate is 3 gpm/ft2. Assume anthracite over sand with 1 ft gravel under media, top of water level during filtration is below troughs, and a 3 ft head drop between bottom of rapid sand filters (bottom of gravel) and top of water in chlorine contact basin.

a. Determine how many parallel filters should be used

b. Design the dimensions (width, length, depth) for one rapid sand filter in the process train and draw features (media, gravel, underdrain, overflow troughs, freeboard, pressure head, and water level in chlorine contact basin) and draw a simple diagram of the rapid sand filter.

c. Using a backwash rate of 12 gpm/ft2 for 15 minutes, what is the volume of water used in each backwash?

solve all with clear steps please

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Ally Wells answered 5 months ago

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