In sewage treatment, the detention period allowed for oxidation ponds ranges from _____________ weeks?
Correct answer: B. 4 to 5
- A. 1 to 2
- B. 4 to 5
- C. 9 to 10
- D. 15 to 20
Explanation
Oxidation ponds require a relatively long detention period, commonly about 4 to 5 weeks, so microorganisms have enough time to reduce the organic load. The shorter 1 to 2 week period is generally insufficient for complete treatment.
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