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The expression of the recirculation factor F is given by ___________

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The expression of the recirculation factor F is given by ___________

(a) F = 1 / (1+0.1 (R/I))^2

(b) F = (1+ R) / (1+0.1 (R/I))^2

(c) F = (1+ I/R) / (1+0.1(R/I))^2

(d) F = (1+ R/I) / (1+0.1(R/I))^2

The question was posed to me in an online quiz.

I would like to ask this question from High Rate Trickling Filter and Secondary Clarifier topic in chapter Sewage Filtration and Activated Sludge Process of Environmental Engineering

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The correct answer is (d) F = (1+ R/I) / (1+0.1(R/I))^2

The explanation: The expression of the recirculation factor F is given by

 F = (1+ R/I) / (1+0.1 (R/I))^2 where, R/I represents the recirculation ratio.

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