Multiple choice

While making CO2 transfer from the bulk liquid to an air bubble inside a fermentor, which of the following step has the maximum resistance?

  1. While moving across the cell membrane of microorganisms<o:p></o:p><o:p></o:p>

  2. While moving through the bubble boundary layer<o:p></o:p>

  3. While moving through bulk fermentation medium<o:p></o:p>

  4. While moving through the liquid gas interface<o:p></o:p>

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

While moving through bulk fermentation medium: CO2 is a large molecule as compared to O2. Due to its large structure, it faces a high resistance at every step while travelling from its source to the microorganism. The maximum resistance is offered while it is travelling through the bulk liquid fermentation medium due to the presence of large number of ingredients which makes the medium viscous.  

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