Question

Which of the following bioreactor mix intermittently without forced aeration?

(a) Packed-bed bioreactors

(b) Rotating drum bioreactors

(c) Spouted-bed bioreactors

(d) Fluidized-bed bioreactors

The question was asked at a job interview.

Origin of the question is Commercial Applications topic in section Commercial Applications of Fermentation of Fermentation Technology

Answer 1

Right choice is (b) Rotating drum bioreactors

To explain: Rotating drum bioreactors mix intermittently without forced aeration. It operates on semi-continuous or continuous mode where the rotating drum is a horizontal cylinder filled with a bed of substrate.