Often aerobatic fermentations give off CO 2 gas because the respiring cells produce CO 2 as glucose nutrient is converted to chemical energy. The conditions used to set k La for O 2 transfer in the...

Often aerobatic fermentations give off CO₂
gas because the respiring cells produce CO₂
as glucose nutrient is converted to chemical energy. The conditions used to set k_La
for O₂
transfer in the fermenter also establish the same hydrodynamic conditions for CO₂
transfer. Consequently, the transfer rate of CO₂
from the liquid to the aeration gas is also described by this volumetric mass-transfer coefficient, kLa. Consider that the k_La
for O₂
in the fermenter is 300 h1. Scale the kLa for O₂
to k_La
for CO₂
transfer using film theory, boundary layer theory, and penetration theory.