Biomedical Engineering Reference
In-Depth Information
microorganisms for the fermentation of cellulose and that for hemicellulose
are not necessarily the same. In any case, they consume sugar molecules and
produce ethanol and carbon dioxide.
11.5.4.6 Distillation and Dehydration
Dilute ethanol broth produced during the fermentation of hemicellulose and
cellulose sugars is distilled to remove water and concentrate the ethanol.
Solid residues containing lignin and microbial cells can be burned to produce
heat or used to generate electricity consumed by ethanol production.
Alternately, the solids can be converted to coproducts, such as animal feed
and nutrients for crops. The last step in the process involves removal of the
remaining water from the distilled ethanol.
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