By Lee Rybeck Lynd (auth.)
Contents/Information: L.R. Lynd, Hanover, NH/USA: Productionof Ethanol from Lignocellulosic fabrics UsingThermophilicBacteria: severe assessment of strength and overview F. Parisi, Genova, Italy: Advances in Lignocellulosics Hydrolysis and within the usage of the Hydrolyzates S. Marsili-Libelli, Florence, Italy: Modelling, identity and regulate of the Activated Sludge Process
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Sample text
The concentration of endogenously-produced ethanol is a more relevant measure of ethanol production capability from a practical perspective than is exogenouslytolerated ethanol. In some cases relative tolerance to exogenous ethanol may indicate a potential not yet achieved in studies on produced ethanol. The ethanol concentration which can be achieved in free-cell continuous culture is that produced and tolerated by exponentially-growing cells. Higher ethanol concentrations have been observed and are likely to be achieved in batch culture.
5 ~o and utilization of a less expensive substrate, for example municipal solid wastes, would make the thermophilic process more competitive. 4 Progress Toward Realization of the Potential of Thermophilic Bacteria for Ethanol Production Having identified cellulase production, pentose utilization, ethanol tolerance, and ethanol yield as the important distinguishing features of thermophiles for ethanol production (Sect. 1), research results in each of these areas are reviewed and evaluated. 1 Cellulase Production and Activity The production of cellulase by thermophilic bacteria is one of their most important attributes for ethanol production (Sect.
128) and Ben-Bassat et al. 194) report high ethanol yields at low growth rates with both Thermoanaerobium brockii and C. thermohydrosulfuricum. Avgerinos and Wang 13o) were able to obtain high ethanol yields only at high growth rates using C. thermosaccharolyticum and C. thermocellum in both mono- and co-culture. Thermophilic bacteria, including both wild-type and mutant strains, have been reported with high ethanol yields. 95 moles mole- 1 glucose has been reported for T. 9 moles mole -1 glucose has been reported for C.