Computer · Environmental Engineering
Which of the following statements is NOT correct with respect to the slow sand filter in a drinking water treatment plant?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Slow sand filtration is suitable when raw water turbidity does not exceed 30 NTU, EXCEPT occasionally for a few days.
- 2The effective size of sand used is in the range between 0.15 and 0.3 mm.
- 3Backwashing is used for cleaning the filter bed.✓
- 4It removes bacteria effectively up to 90%.
Correct answer
Backwashing is used for cleaning the filter bed.
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