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The biochemical oxygen demand is computed by __________

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The biochemical oxygen demand is computed by __________

(a) Dissolved oxygen / Dilution factor

(b) Dissolved oxygen + Dilution factor

(c) Dissolved oxygen – Dilution factor

(d) Dissolved oxygen * Dilution factor

The question was posed to me in an international level competition.

This interesting question is from Oxygen Demand in portion Wastewater Characteristics of Environmental Engineering

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Best answer
The correct option is (d) Dissolved oxygen * Dilution factor

Explanation: BOD = Dissolved oxygen * Dilution factor.

Where Dilution factor = Volume of diluted sewage sample / Volume of undiluted sewage sample.

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