1. Ethanol production from biomass by repetitive solid-state fed-batch fermentation with continuous recovery of ethanol
- Author
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Churairat Moukamnerd, Satoshi Harashima, Yoshio Katakura, Masahiro Kino-oka, Kazuaki Ninomiya, Hideo Noda, Minetaka Sugiyama, Suteaki Shioya, Yoshinobu Kaneko, and Chuenchit Boonchird
- Subjects
Ethanol ,Chemistry ,business.industry ,Starch ,General Medicine ,Pulp and paper industry ,Zea mays ,Applied Microbiology and Biotechnology ,Yeast ,Biotechnology ,chemistry.chemical_compound ,Hydrolysis ,Bioreactors ,Solid-state fermentation ,Wastewater ,Biofuel ,Yeasts ,Fermentation ,Ethanol fuel ,Biomass ,business - Abstract
To save cost and input energy for bioethanol production, a consolidated continuous solid-state fermentation system composed of a rotating drum reactor, a humidifier, and a condenser was developed. Biomass, saccharifying enzymes, yeast, and a minimum amount of water are introduced into the system. Ethanol produced by simultaneous saccharification and fermentation is continuously recovered as vapor from the headspace of the reactor, while the humidifier compensates for the water loss. From raw corn starch as a biomass model, 95 +/- 3, 226 +/- 9, 458 +/- 26, and 509 +/- 64 g l(-1) of ethanol solutions were recovered continuously when the ethanol content in reactor was controlled at 10-20, 30-50, 50-70 and 75-85 g kg-mixture(-1), respectively. The residue showed a lesser volume and higher solid content than that obtained by conventional liquid fermentation. The cost and energy for intensive waste water treatment are decreased, and the continuous fermentation enabled the sustainability of enzyme activity and yeast in the system.
- Published
- 2010