Civil Engineering PE

Category - Water Treatment

What is the average filtration rate (in GPM/sq. ft.) for a plant with three 10-foot square filters that treats 1 million gallons in 24 hours of continuous operation?
  1. 0.33 GPM/sq. ft.
  2. 2.32 GPM/sq. ft.
  3. 6.95 GPM/sq. ft.
  4. Not enough information provided
Explanation
Answer: B - The average filtration rate for a plant with three 10-foot square filters that treats 1 million gallons per day is 2.32 GPM/sq. ft.

Solution: Filtration rate = total gallons treated per unit of time / total filter surface area

= (1,000,000 gallons/day x (1 day/1,440 minutes)) / (3 x 10 ft x 10 ft)

= (695 gallons/minute (GPM)) / (300 square feet)

= 2.32 GPM/sq. ft.
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