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5 days BOD at 20^oC is ___ of total demand.

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in Environmental Engineering by (81.4k points)
5 days BOD at 20^oC is ___ of total demand.

(a) 20%

(b) 47%

(c) 68%

(d) 100%

This question was addressed to me in final exam.

This interesting question is from Population Equivalent and Relative Stability topic in chapter Wastewater Characteristics of Environmental Engineering

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Correct option is (c) 68%

The explanation is: 5 days BOD at 20^oC is the standard BOD which is 68% of total demand, whereas 10 days BOD at 20^oC is 90% of total demand.

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