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Influence of process parameters on growth of Clostridium ljungdahlii and Clostridium autoethanogenum on synthesis gas

Paper ID Volume ID Publish Year Pages File Format Full-Text
17916 42705 2009 8 PDF Available
Title
Influence of process parameters on growth of Clostridium ljungdahlii and Clostridium autoethanogenum on synthesis gas
Abstract

Effects of initial medium pH and gas flow rate on Clostridium ljungdahlii and Clostridium autoethanogenum in liquid batch, continuous gas fermentations were investigated. Synthesis gas components were supplied at varying flow rates (5, 7.5 and 10 mL/min) for C. ljungdahlii (pH 6.8 and 5.5) and C. autoethanogenum (pH 6.0). Growth on synthesis gas was slower than growth on sugars. For C. ljungdahlii, higher cell densities were achieved at pH 6.8 (579 mg/L) compared to pH 5.5 (378 mg/L). The ethanol concentration at pH 6.8 was also 110% greater than that at pH 5.5. The interaction of flow rate and pH was statistically significant with the greatest acetate production in the 10 mL/min, pH 6.8 treatment. The ethanol to acetate ratios were smaller at lower pH levels and higher flow rates. In C. autoethanogenum fermentations, higher flow rates resulted in greater end product formation with no significant effect on product ratios.

Keywords
Clostridium ljungdahlii; Clostridium autoethanaogenum; Synthesis gas fermentation; Ethanol; Acetate
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Influence of process parameters on growth of Clostridium ljungdahlii and Clostridium autoethanogenum on synthesis gas
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Publisher
Database: Elsevier - ScienceDirect
Journal: Enzyme and Microbial Technology - Volume 44, Issue 5, 6 May 2009, Pages 281–288
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us