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Calculate the percentage of relative stability, given 5 day incubation period at 37^0C.

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+1 vote
in Environmental Engineering by (81.4k points)
Calculate the percentage of relative stability, given 5 day incubation period at 37^0C.

(a) 50%

(b) 60%

(c) 90%

(d) 99%

I have been asked this question during an interview.

My query is from Population Equivalent and Relative Stability topic in division Wastewater Characteristics of Environmental Engineering

1 Answer

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Best answer
Right option is (c) 90%

Easy explanation: Relative stability at 370C is given by, S = 100 (1-(0.630)^ T37) = 100 (1-(0.630)^5) = 90.08% which is approximately 90%.

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