Air-binding in rapid sand filters is encountered when?

Previouly Asked

GPSC AE CE 2021 Exam (Part B - Civil) (: 27 Nov 2021)


Air-binding in rapid sand filters is encountered when


  1. There is excessive negative head
  2. The water is subjected to prolonged aeration
  3. The raw water contains dissolved gases
  4. The filter bed comprises largely of coarse sand


Solution

Answer - There is excessive negative head

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