One of the usual parameters of pollution in domestic waste water is
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3 day 20°C BOD
3 day 25°C BOD
5 day 20°C BOD
5 day 25°C BOD
Correct Answer
C. 5 day 20°C BOD
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Biochemical Oxygen Demand (BOD): standard test is 5-day incubation at 20 degrees C (BOD5). Measures oxygen consumed by microorganisms decomposing organic matter. Domestic sewage BOD5 ~ 200–300 mg/L. IS 2490 effluent limit: BOD5 <= 30 mg/L for discharge to inland surface water. Ultimate BOD (BODu) ≈ 1.5 x BOD5 for domestic sewage. Standard BOD test is 5 days at 20°C
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This MCQ belongs to WBPSC AE Previous Years Questions Series. Full tests include timed attempts, rank comparison and subject-wise analysis.