Abstract
The glucose and/or dissolved oxygen limited continuous culture of yeast Candida utilis was studied. Six different mathematical models were designed to describe and analyze the experiments. The model considering the production of surface active compounds at autoanaerobic conditions and dissolved oxygen consumption for nongrowth associated exogeneous respiration yields the best fit. The results may be applied for aerobic waste water treatment plants, process analysis and simulation.
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Abbreviations
- a, b, c :
-
coefficients in Eq. (26)
- cetg/l:
-
ethanol steady state concentration
- d g/l:
-
density
- D 1/h:
-
dilution rate
- D0 m:
-
characteristic dimension in Eq. (26)
- E :
-
enhancement factor defined by Eq. (23)
- h m:
-
height of absorption apparatus in Eq. (26)
- k, k′ :
-
constants
- k″ Pa:
-
constant
- k1 l/g:
-
constant
- k2 1/h:
-
constant
- kal/g:
-
adsorption rate constant
- K F :
-
partition coefficient defined by Eq. (16)
- kLa 1/h:
-
aeration capacity of a fermenter
- kLaet1/h:
-
aeration capacity in the presence of ethanol
- KIg/l:
-
inhibition constant
- KOimg/l:
-
inhibition constant
- Komg/l:
-
half-saturation constant for oxygen
- KSg/l:
-
half-saturation constant for substrate
- KS1 g/l:
-
half-saturation constant for substrate S 1
- K S2 :
-
g/l half-saturation constant for substrate S 2
- mO1/h:
-
maintenance coefficient for oxygen
- mS1/h:
-
maintenance coefficient for sugar
- O mg/l:
-
dissolved oxygen steady state concentration
- O⋆mg/l:
-
oxygen solubility
- O ⋆et mg/l:
-
oxygen solubility in the presence of ethanol
- OTR mg/(hl):
-
oxygen transfer rate
- OTRet mg/(hl):
-
ox. transf. rate in the presence of ethanol
- qE1/h:
-
specific rate of ethanol production
- S g/l:
-
substrate steady state concentration
- S0 g/l:
-
inlet substrate concentration
- S1 g/l:
-
first limiting substrate
- S2 g/l:
-
second limiting substrate
- X g/l:
-
biomass steady state concentration
- XGg/l:
-
biomass concentration at the interface
- XTg/l:
-
total biomass concentration
- Y S/X :
-
substrate/biomass yield coefficient
- Y O/X :
-
oxygen/biomass yield coefficient
- μ 1/h:
-
specific growth rate
- μG1/h:
-
specific growth rate at the interface
- μL1/h:
-
specific growth rate in the liquid phase
- σ Pa:
-
surface tension
- σetPa:
-
surface tension for ethanol
- σwPa:
-
surface tension for water (medium)
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Schwippel, J., Votruba, J. Oxygen and/or glucose limitation in a chemostat culture of Candida utilis mathematical model identification. Bioprocess Eng. 13, 133–140 (1995). https://doi.org/10.1007/BF00369696
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DOI: https://doi.org/10.1007/BF00369696