Abstract
A model of continuous acetonobutylic fermentation is proposed. This model correctly portrays the predominantly solvents formation observed at acidic extracellular pH and predominantly acids production at more neutral pH, as well as observed effects of dilution rate and feed substrate on products' concentrations. A fair agreement between experimental and theoretical predictions is achieved for a broad range of operating variables.
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Abbreviations
- A gl−1 :
-
Acetone concentration
- AA gl−1 :
-
Acetic acid concentration
- B gl−1 :
-
Butanol concentration
- BA gl−1 :
-
Butyric acid concentration
- D h−1 :
-
Dilution rate
- DBA gl−1 :
-
Butyrate concentration
- E gl−1 :
-
Ethanol concentration
- r A gl−1 h−1 :
-
Rate of acetone formation
- r AA gl−1 h−1 :
-
Rate of acetic acid accumulation
- r B gl−1 h−1 :
-
Rate of butanol formation
- r BA gl−1 h−1 :
-
Rate of butyric acid accumulation
- r E gl−1 h−1 :
-
Rate of ethanol formation
- r S gl−1 h−1 :
-
Rate of substrate consumption
- r X gl−1 h−1 :
-
Rate of biomass growth
- S gl−1 :
-
Substrate concentration
- UBA gl−1 :
-
Butyric acid concentration (undissociated form)
- Y x/s g/g:
-
Theoretical yield of cells based on substrate consumed
- Y p/s g/g:
-
Theoretical yield of product based on substrate consumed
- X gl−1 :
-
Biomass concentration
- μ h−1 :
-
Specific growth rate
- c :
-
refers to rate of conversion
- i :
-
intracellular
- o :
-
extracellular
- p :
-
refers to formation
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Jarzębski, A.B., Goma, G. & Soucaille, P. Modelling of continuous acetonobutylic fermentation. Bioprocess Engineering 7, 357–361 (1992). https://doi.org/10.1007/BF00369491
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DOI: https://doi.org/10.1007/BF00369491