Water filtration rate in a rapid sand filter ranges from ______________ kilolitres/m2/hr?
Correct answer: B. 3 to 6
- A. 0.1 to 1
- B. 3 to 6
- C. 10 to 15
- D. 15 to 20
Explanation
Rapid sand filters operate at much higher rates than slow sand filters, typically about 3 to 6 kL/m²/h in standard treatment design data. The lower range is characteristic of slow filtration.
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