Summary
An excess of organic waste, containing up to 60% cellulose and hemicellulose is produced worldwide. The conversion of this cellulosic material to ethanol is discussed: The two-step process consisting of a hydrolysis step to glucose and the subsequent fermentation by yeasts; and the one-step process, a fermentation of the cellulose by the anaerobic thermophile Clostridium thermocellum, or by a thermophilic, anaerobic, defined mixed culture. The use of the latter seems to be very feasible. To achieve an economic process, it is suggested to combine this approach with a thermophilic fermentation of the effluent and/or stillage obtained to produce methane.
Acknowledgment. Part of this work was supported by Energy and Research Development Administration contract number EY-76–509-0888-M003, and by the Deutsche Forschungsgemeinschaft.
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Wiegel, J. (1982). Ethanol from cellulose. In: Mislin, H., Bachofen, R. (eds) New Trends in Research and Utilization of Solar Energy through Biological Systems. EXS 43: Experientia Supplementum, vol 43. Birkhäuser, Basel. https://doi.org/10.1007/978-3-0348-6305-6_17
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