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The recirculation factor in a low rate trickling filter is ___________

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in Environmental Engineering by (81.4k points)
The recirculation factor in a low rate trickling filter is ___________

(a) 0

(b) 1

(c) 10

(d) 100

I got this question in quiz.

My query is from Conventional Trickling Filter topic in portion Sewage Filtration and Activated Sludge Process of Environmental Engineering

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The correct choice is (b) 1

Explanation: The recirculation factor F = (1+ R/I) / (1+0.1 (R/I)) ^2 = (1+0) /(1+0)^2 = 1.

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