Summary
The effect of soybean oil on the volumetric oxygen transfer coefficient during the cultivation ofAerobacter aerogenes cells is presented. For our aeration-agitation conditions (0.278 vvm and 500 rpm), it has been demonstrated that the use 19% (v/v) of soybean oil enabled a 1.85-fold increase of thek l a coefficient (calculated on a per liter aqueous phase basis). For smaller volumetric oil fractions,k L a increased linearly with the oil loading. Because of the oxygen-vector properties of soybean oil, this oil is able to significantly increase thek L a of a bioreactor.
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Abbreviations
- C*, C:
-
saturation and actual dissolved oxygen concentrations respectively (g/m3)
- KLa:
-
volumetric oxygen transfer coefficient (h−1)
- KLainitial :
-
k La measured before the oil addition (h−1)
- MO2 :
-
molar mass of oxygen (dalton)
- N:
-
oxygen transfer rate (g/m3. h)
- PO2. PN2 :
-
partial pressures ofO 2 andN 2 in the gas (atm)
- PH2OT :
-
partial pressure of water in air at the temperatureT (atm)
- PT :
-
total pressure (atm)
- Q0 :
-
volumetric flow rate of outlet air before seeding (m3/h)
- Sp:
-
spreading coefficient (dynes/cm)
- T:
-
absolute temperature of outlet gas (K)
- Vi :
-
volume of the liquidi in the fermentor (m3)
- VM :
-
molar volume at 273 K and 1 atm (m3/mole)
- σij :
-
interfacial tension betweeni andj componants (dynes/cm)
- ∈v :
-
volumetric fraction of the oil (v/v)
- G:
-
gas
- O:
-
oil
- W:
-
water
- i:
-
inlet
- o:
-
outlet
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Rols, J.L., Goma, G. Enhanced oxygen transfer rates in fermentation using soybean oil-in-water dispersions. Biotechnol Lett 13, 7–12 (1991). https://doi.org/10.1007/BF01033508
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DOI: https://doi.org/10.1007/BF01033508