Production of acetone, butanol and ethanol by Clostridium beijerinckii BA101 and in situ recovery by gas stripping

  • T.C. Ezeji
  • N. Qureshi
  • H.P. Blaschek

Abstract

We examined the effect of gas-stripping on the in situ removal of acetone, butanol, and ethanol (ABE) from batch reactor fermentation broth. The mutant strain (Clostridium beijerinckii BA101) was not affected adversely by gas stripping. The presence of cells in the fermentation broth affected the selectivities of ABE. A considerable improvement in the productivity and yield was recorded in this work in comparison with the non-integrated process. In an integrated process of ABE fermentation-recovery using C. beijerinckii BA101, ABE productivities and yield were improved up to 200 and 118%, respectively, as compared to control batch fermentation data. In a batch reactor C. beijerinckii BA101 utilized 45.4 g glucose l−1 and produced 17.7 g total ABE l−1, while in the integrated process it utilized 161.7 g glucose l−1 and produced total ABE of 75.9 g l−1. In the integrated process, acids were completely converted to solvents when compared to the non-integrated process (batch fermentation) which contained residual acids at the end of fermentation. In situ removal of ABE by gas stripping has been reported to be one of the most important techniques of solvent removal. During these studies we were able to maintain the ABE concentration in the fermentation broth below toxic levels.

Acetone butanol ethanol (ABE) Clostridium beijerinckii BA101 fermentation gas stripping integrated process productivity selectivity yield 

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Copyright information

© Kluwer Academic Publishers 2003

Authors and Affiliations

  • T.C. Ezeji
    • 1
  • N. Qureshi
    • 1
  • H.P. Blaschek
    • 1
  1. 1.Department of Food Science and Human NutritionBiotechnology and Bioengineering Group, University of IllinoisUrbanaUSA

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