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_____ is the amount of oxygen required to oxidize only organic matter in sewage.

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_____ is the amount of oxygen required to oxidize only organic matter in sewage.

(a) Turbidity

(b) BOD

(c) COD

(d) DO

I had been asked this question during an interview.

I'm obligated to ask this question of Oxygen Demand topic in section Wastewater Characteristics of Environmental Engineering

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Best answer
Right answer is (b) BOD

Explanation: BOD is the amount of oxygen required to oxidize only organic matter in sewage. It is always less than COD as COD oxidizes both organic and inorganic matter.

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