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The temperature of 20°C is used to take BOD of _________

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The temperature of 20°C is used to take BOD of _________

(a) 7-days

(b) 10-days

(c) 5- days

(d) 1-day

I had been asked this question by my school principal while I was bunking the class.

This intriguing question originated from Effluent topic in division Recovery and Purification of Fermentation Products, Effluent Treatment, Bioreactor Design Considerations of Fermentation Technology

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Correct choice is (c) 5- days

Explanation: The temperature of 20°C is used to take BOD of 5 days because in 5 days the dissolved oxygen present in water is consumed for the decomposition of organic matter. Hence 5 day BOD is used as a standard to represent the amount of oxygen dissolved.

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