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______ represents the number of dilutions required to reduce odor.

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______ represents the number of dilutions required to reduce odor.

(a) Dispersion

(b) Threshold odor number

(c) BOD

(d) COD

I have been asked this question during a job interview.

Query is from Physical Characteristics of Waste Water in portion Wastewater Characteristics of Environmental Engineering

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Right choice is (b) Threshold odor number

The explanation is: The threshold odor number is equal to the volume of samples of water required to add to 100 units of odorless fresh water at which the mixture gives the first detectable odor.

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