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Issue 1, 2011
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Biological formation of caproate and caprylate from acetate: fuel and chemical production from low grade biomass

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Abstract

This research introduces an alternative mixed culture fermentation technology for anaerobic digestion to recover valuable products from low grade biomass. In this mixed culture fermentation, organic waste streams are converted to caproate and caprylate as precursors for biodiesel or chemicals. It was found that acetate, as the main intermediate of anaerobic digestion, can be elongated to medium chain fatty acids with six and eight carbon atoms. Mixed microbial communities were able to produce 8.17 g lāˆ’1 caproate and 0.32 g lāˆ’1 caprylate under methanogenesis-suppressed conditions in a stable batch reactor run. The highest production rate was 25.6 mM C caproate per day with a product yield of 0.6 mol C per mol C. This elongation process occurred with both ethanol and hydrogen as electron donors, demonstrating the flexibility of the process. Microbial characterization revealed that the microbial populations were stable and dominated by relatives of Clostridium kluyveri.

Graphical abstract: Biological formation of caproate and caprylate from acetate: fuel and chemical production from low grade biomass

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Publication details

The article was received on 19 Jul 2010, accepted on 15 Oct 2010 and first published on 11 Nov 2010


Article type: Paper
DOI: 10.1039/C0EE00282H
Citation: Energy Environ. Sci., 2011,4, 216-224
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    Biological formation of caproate and caprylate from acetate: fuel and chemical production from low grade biomass

    K. J. J. Steinbusch, H. V. M. Hamelers, C. M. Plugge and C. J. N. Buisman, Energy Environ. Sci., 2011, 4, 216
    DOI: 10.1039/C0EE00282H

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