The influence of bark on the fermentation of Douglas-fir whitewood pre-hydrolysates
2002
Robinson, J. | Keating, J.D. | Boussaid, A. | Mansfield, S.D. | Saddler, J.N.
Douglas-fir (Pseudotsuga menziesii) white-wood was supplemented with increasing concentrations of bark (0-30%) and was pretreated using SO2-catalysed steam explosion. The presence of bark in the feedstock resulted in the decreased recovery of total sugars, furfural and 5-hydroxymethylfurfural in the resultant prehydrolysate. No detrimental impact on monomer sugar recovery was observed. The concentration of lipophilic extractives present in the pre-hydrolysate increased with increasing bark loading, to a maximum of 0.43 g l(-1). The water-soluble pre-hydrolysates were fermented by Saccharomyces cerevisiae to determine the impact of bark on sugar consumption and ethanol production. Despite the inclusion of bark, fermentation of all pre-hydrolysates resulted in the complete consumption of hexose sugars within 48 h. Ethanol yields were greater than 0.43 g g(-1) for ail pre-hydrolysates regardless of bark content, indicating that, up to a content of 30%, bark had a negligible impact on the fermentation of the pre-hydrolysates to ethanol.
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