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Performance of batch, fed-batch, and continuous A-B-E fermentation with pH-control.

Si-Yu Li1, Ranjan Srivastava, Steven L Suib

  • 1Department of Chemical, Materials and Biomolecular Engineering, University of Connecticut, Storrs, CT 06269, USA.

Bioresource Technology
|January 14, 2011
PubMed
Summary
This summary is machine-generated.

Continuous fermentation optimizes butanol production, achieving higher yields and productivity compared to batch or fed-batch methods. Controlled pH at 4.5 is crucial for maximizing butanol output in Acetone-Butanol-Ethanol (A-B-E) fermentation.

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Area of Science:

  • Biotechnology
  • Microbial Fermentation
  • Bioenergy

Background:

  • Acetone-Butanol-Ethanol (A-B-E) fermentation is a key process for biofuel production.
  • Optimizing fermentation conditions is essential for improving butanol yield and productivity.
  • Clostridium acetobutylicum is commonly used for A-B-E fermentation, but achieving high butanol selectivity can be challenging.

Purpose of the Study:

  • To compare the efficiency of batch, fed-batch, and continuous A-B-E fermentation modes for butanol production.
  • To determine the optimal fermentation strategy for maximizing butanol yield and productivity.
  • To investigate the impact of controlled pH on solvent production ratios.

Main Methods:

  • Conducted batch, fed-batch, and continuous Acetone-Butanol-Ethanol (A-B-E) fermentations using Clostridium acetobutylicum.
  • Maintained a controlled pH of 4.5, identified as optimal for solvent production.
  • Varied dilution rates in continuous fermentation to assess butanol yield and productivity.

Main Results:

  • Continuous fermentation yielded higher butanol productivity (0.81 g/L/h) and yield (0.21 g-butanol/g-glucose) at a dilution rate of 0.1h⁻¹.
  • Batch fermentation showed the highest overall solvent yield but lower productivity.
  • Controlled pH at 4.5 in continuous mode resulted in up to 94% butanol selectivity, significantly improving upon the typical 3:6:1 acetone:butanol:ethanol ratio.

Conclusions:

  • Continuous A-B-E fermentation at a low dilution rate is the preferred method for optimizing butanol yield and productivity.
  • Fed-batch fermentation is not recommended for efficient solvent production due to delays in transitioning from acidogenesis to solventogenesis.
  • Controlling pH at 4.5 is critical for enhancing butanol selectivity during A-B-E fermentation.