The 'Biochemical Oxygen Demand' of treated sewage effluent discharged to inland surface water as per CPCB (IS 2490) should not exceed:
Choose the correct answer
500 mg/L
30 mg/L (CPCB standard for BOD of effluent to inland surface water)
200 mg/L
5 mg/L (same as drinking water)
Correct Answer
B. 30 mg/L (CPCB standard for BOD of effluent to inland surface water)
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CPCB General Standards (Environment Protection Rules Schedule VI / IS 2490): For discharge to inland surface water: BOD (5 days at 20°C) ≤ 30 mg/L; COD ≤ 250 mg/L; SS ≤ 100 mg/L; pH 6.0–9.0; Coliform < 10,000 MPN/100 mL. For discharge to land for irrigation: BOD ≤ 100 mg/L.
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