NEET · BiologyHard
During secondary sewage treatment, the BOD of the effluent is significantly reduced. If the BOD value of a sample is measured as and after treatment it drops to , what is the percentage reduction in BOD?
- A.80 percent
- B.85 percent
- C.90 percent
- D.95 percent
Show correct answer & step-by-step solution
Correct answer: C — 90 percent
Solution
- Initial BOD = .
- Final BOD = .
- Reduction = .
- Reduction = .
- Hence the answer is (C).
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