Abstract
To ensure economic implementation of syngas fermentation as a fuel-producing platform, engineers and scientists must both lower operating costs and increase product value. A considerable part of the operating costs is spent to procure chemicals for fermentation medium that can sustain sufficient growth of carboxydotrophic bacteria to convert synthesis gas (syngas: carbon monoxide, hydrogen, and carbon dioxide) into products such as ethanol. Recently, we have observed that wildtype carboxydotrophic bacteria (including Clostridium ljungdahlii) can produce alcohols with a longer carbon chain than ethanol via syngas fermentation when supplied with the corresponding carboxylic acid precursors, resulting in possibilities of increasing product value. Here, we evaluated a proof-of-concept system to couple syngas fermentation with the carboxylate platform to both lower medium costs and increase product value. Our carboxylate platform concept consists of an open culture, anaerobic fermentor that is fed with corn beer from conventional yeast fermentation in the corn kernel-to-ethanol industry. The mixed-culture anaerobic fermentor produces a mixture ofcarboxylic acids at dilute concentrations within the carboxylate platform effluent (CPE)...Continue Reading
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