Question

The non-agitated fermentations are carried out in vessels of a height/diameter ratio of ________

(a) 1:2

(b) 5:1

(c) 3:2

(d) 4:1

The question was posed to me in class test.

I would like to ask this question from Fermenter Design in section Design of Fermenter of Fermentation Technology

Answer 1

Correct choice is (b) 5:1

For explanation: The non-agitated fermentations are carried out in vessels of a height/diameter ratio of 5:1. In such vessels, aeration is sufficient enough to produce high disruption but a tall column of liquid requires greater input energy in compressed air production.