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Energies 2013, 6(3), 1794-1801; doi:10.3390/en6031794
Article

Production of Bioethanol from Carrot Pomace Using the Thermotolerant Yeast Kluyveromyces marxianus

,
 and *
Department of Bioengineering, Tatung University, 40 Chungshan N. Rd. Sec. 3, Taipei 10452, Taiwan
* Author to whom correspondence should be addressed.
Received: 8 October 2012 / Revised: 20 December 2012 / Accepted: 8 March 2013 / Published: 21 March 2013
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Abstract

Carrot pomace, a major agricultural waste from the juice industry, was used as a feedstock for bioethanol production by fermentation with the thermotolerant yeast Kluyveromyces marxianus. Treatment of the carrot pomace with AccelleraseTM 1000 and pectinase at 50 °C for 84 h, resulted in conversion of 42% of its mass to fermentable sugars, mainly glucose, fructose, and sucrose. Simultaneous saccharification and fermentation (SSF) at 42 °C was performed on 10% (w/v) carrot pomace; the concentration of ethanol reached 18 g/L and the yield of ethanol from carrot pomace was 0.18 g/g. The highest ethanol concentration of 37 g/L was observed with an additional charge of 10% supplemented to the original 10% of carrot pomace after 12 h; the corresponding yield was 0.185 g/g. Our results clearly demonstrated the potential of combining a SSF process with thermotolerant yeast for the production of bioethanol using carrot pomace as a feedstock.
Keywords: bioethanol; carrot pomace; Kluyveromyces marxianus; simultaneous saccharification and fermentation bioethanol; carrot pomace; Kluyveromyces marxianus; simultaneous saccharification and fermentation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Yu, C.-Y.; Jiang, B.-H.; Duan, K.-J. Production of Bioethanol from Carrot Pomace Using the Thermotolerant Yeast Kluyveromyces marxianus. Energies 2013, 6, 1794-1801.

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