Adding value to sugarcane bagasse using a xylose metabolising yeast.

THE FEASIBILITY of a lignocellulosic biorefinery that produces fuel ethanol and yeast for feed is evaluated within a sugarcane bagasse context. The proposed biorefinery combines next generation ethanol technology with an innovative non-recombinant strain of Saccharomyces cerevisiae. This patented, natural yeast not only efficiently ferments conventional sugars to ethanol, but has the ability to aerobically convert xylose, glycerol and acetate into high protein yeast biomass for potential use as cattle, swine, poultry and aquaculture feed. Experimental results demonstrate the yeast’s ability to convert bagasse-derived wood molasses into valuable products. Process modelling based upon these experimental results suggest it is possible to provide an additional revenue stream to a sugarcane mill with no change in land usage.