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Formic Acid Formation by $Clostridium$ $ljungdahlii$ at Elevated Pressures of Carbon Dioxide and Hydrogen

Oswald, Florian; Stoll, I. Katharina; Zwick, Michaela; Herbig, Sophia; Sauer, Jörg; Boukis, Nikolaos; Neumann, Anke

Abstract:
Low productivities of bioprocesses using gaseous carbon and energy sources are usually caused by the low solubility of those gases (e.g., H2 and CO). It has been suggested that increasing the partial pressure of those gases will result in higher dissolved concentrations and should, therefore, be helpful to overcome this obstacle. Investigations of the late 1980s with mixtures of hydrogen and carbon monoxide showed inhibitory effects of carbon monoxide partial pressures above 0.8 bar. Avoiding any effects of carbon monoxide, we investigate growth and product formation of Clostridium ljungdahlii at absolute process pressures of 1, 4, and 7 bar in batch stirred tank reactor cultivations with carbon dioxide and hydrogen as sole gaseous carbon and energy source. With increasing process pressure, the product spectrum shifts from mainly acetic acid and ethanol to almost only formic acid at a total system pressure of 7 bar. On the other hand, no significant changes in overall product yield can be observed. By keeping the amount of substance flow rate constant instead of the volumetric gas feed rate when increasing the process pressure, we increased the overall product yield of 7.5 times of what has been previously reported in the literature. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000081050
Veröffentlicht am 14.03.2018
Originalveröffentlichung
DOI: 10.3389/fbioe.2018.00006
Scopus
Zitationen: 2
Web of Science
Zitationen: 1
Coverbild
Zugehörige Institution(en) am KIT Institut für Bio- und Lebensmitteltechnik (BLT)
Institut für Katalyseforschung und -Technologie (IKFT)
Publikationstyp Zeitschriftenaufsatz
Jahr 2018
Sprache Englisch
Identifikator ISSN: 2296-4185
urn:nbn:de:swb:90-810507
KITopen-ID: 1000081050
HGF-Programm 35.13.03 (POF III, LK 01)
Erschienen in Frontiers in Bioengineering and Biotechnology
Band 6
Seiten Art.Nr. 6
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Schlagworte Clostridium ljungdahlii; high-pressure fermentation; acetogenic bacteria; acetic acid; formic acid; mass transfer
Nachgewiesen in Scopus
Web of Science
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