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Table 4 Model parameters for bubble column bioreactor design and operation during gas fermentation

From: Modeling ethanol production through gas fermentation: a biothermodynamics and mass transfer-based hybrid model for microbial growth in a large-scale bubble column bioreactor

Parameter

Unit

Value

Operation conditions

 Temperature

K

310.15

 Top pressure

Pa

1.52 × 105

 Gas hold-up

m 3G m −3G+L

0.15

 pH

–

5.0

 Maximum ethanol concentrationa

mol m−3

1304

Bioreactor dimensions

 Volume

m3

700

 Height

m

20

 Aspect ratio

–

3.0

 Diameter

m

6.7

 Overhead space

%

20

 Height of gas–liquid mixture

m

16

Relevant gas properties for the mass transfer model (at 37 °C)

Diffusivitiesb

 O2

 CO

 H2

 CO2

m2 s−1

3.21 × 10−9

2.88 × 10−9

4.55 × 10−9

2.70 × 10−9

Henry’s coefficientc

 CO

 H2

 CO2

molS m−3 Pa−1

0.79 × 10−5

0.72 × 10−5

24.6 × 10−5

  1. aLiquid–vapor equilibria data for the ethanol/water system were estimated using the non-random two-liquid model for calculating activity coefficients (see Additional file 1: Table S3)
  2. bEstimated according to the method presented by Wilke and Chang [84]
  3. cEstimated according to the method presented by Sander [85]