Which one of the following bioreactor configurations is the basis for a trickling

Which one of the following bioreactor configurations is the basis for a trickling

Q. Which one of the following bioreactor configurations is the basis for a trickling biological filter?

 (A) Stirred tank                       

(B) Packed bed

(C) Air lift                               

(D) Fluidized bed

Ans: Packed bed

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