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Table 3 Results of fed-batch fermentation in biofilm reactors coupled with fixed-bed adsorption

From: Biobutanol production in a Clostridium acetobutylicum biofilm reactor integrated with simultaneous product recovery by adsorption

  Fermentation with selective adsorption of butanol Fermentation with co-adsorption of acetone Fermentation with redox modulation
Fermentation time (h) 57 64 135
Glucose fermented (g/L) 198 297 367
Resin used (g) 418 812 910
Adsorbed ethanol (g) 1.8 0.82 2.2
Adsorbed acetone (g) 12.3 35.7 23.6
Adsorbed butanol (g) 42.1 68.1 84.7
Adsorbed acetoin (g) 0.40 2.4 1.2
Adsorbed butyrate (g) 1.9 3.1 8.7
Equivalent ethanol concentration (g/L) 5.1 4.8 6.8
Equivalent acetone concentration (g/L) 14.8 30.9 28.8
Equivalent butanol concentration (g/L) 38.2 58.3 92.6
Equivalent acetoin concentration (g/L) 1.7 2.6 2.6
Equivalent butyrate concentration (g/L) 1.7 2.4 10.8
aSolvent concentration (g/L) 59.8 96.5 130.7
aSolvent productivity (g · L-1 · h-1) 1.05 1.51 0.97
aSolvent yield (g/g) 0.302 0.325 0.356
bTotal product yield (g/g) 0.311 0.333 0.386
Butanol-acetone molar ratio 2.6c 1.9 3.2
  1. aSolvent: ABE and acetoin. bTotal product: ABE, acetoin, and butyrate. Acetate is not considered to be a product. cThe increased butanol-acetone ratio was probably due to the evaporation of acetone.