Abstract
In this study, we report on a butanol production process by immobilized Clostridium acetobutylicum in a continuous packed bed reactor (PBR) using Tygon® rings as a carrier. The medium was a solution of lactose (15–30 g/L) and yeast extract (3 g/L) to emulate the cheese whey, an abundant lactose-rich wastewater. The reactor was operated under controlled conditions with respect to the pH and to the dilution rate. The pH and the dilution rate ranged between 4 and 5, the dilution rate between 0.54 and 2.4 h−1 (2.5 times the maximum specific growth rate assessed for suspended cells). The optimal performance of the reactor was recorded at a dilution rate of 0.97 h−1: the butanol productivity was 4.4 g/Lh and the selectivity of solvent in butanol was 88%w.
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Abbreviations
- AA, Ac, B, BA, Et, L:
-
Concentration of acetic acid, acetone, butanol, butyric acid, ethanol, and lactose (g/L)
- D :
-
Dilution rate, 1/h
- q :
-
Productivity (g/L h)
- R :
-
Butanol acetone ratio (g/g)
- X :
-
Suspended biomass (gDM/L)
- Y A/L :
-
Lactose to acids fractional yield (g/g)
- Y S/L :
-
Lactose to solvents fractional yield (g/g)
- Et:
-
Ethanol
- Ac:
-
Acetone
- B:
-
Butanol
- IN:
-
Feeding stream
- OUT:
-
Effluent stream
- δ:
-
Accuracy on carbon balance at steady state (g/g)
- Φ:
-
Butanol selectivity with respect to solvents (g/g)
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The authors are indebted to Mrs. Sabrina Manzi for her assistance in experimental investigation.
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Napoli, F., Olivieri, G., Russo, M.E. et al. Butanol production by Clostridium acetobutylicum in a continuous packed bed reactor. J Ind Microbiol Biotechnol 37, 603–608 (2010). https://doi.org/10.1007/s10295-010-0707-8
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DOI: https://doi.org/10.1007/s10295-010-0707-8