Abstract
In the present work, technological and economical potentials of sugarcane bagasse-to-ethanol process using Scheffersomyces stipitis/S. cerevisiae consortium were investigated. A fed-batch enzyme saccharification followed by fermentation (SHF) using optimized yeast consortium achieved a maximum ethanol titer of 60 g/L with ethanol yield exceeding 70% of theoretical. Techno-economic analysis was assessed using a fully integrated process flowsheeting model, showing the optimized fed-batch yeast co-culture as the most cost-effective configuration with the ethanol yield of 250 kg-ethanol/ton-bagasse. The minimal ethanol selling price was 26.7 baht/L-ethanol, closed to the current ethanol selling price from cassava-based process. Process sensitivity analyses revealed the potentials for further cost reduction up to 44% by reducing enzyme dosage and increasing ethanol titer. Hence, this study provides an economically viable prototype for high-titer lignocellulosic ethanol production using S. stipitis/S. cerevisiae consortium which may offer better economic value than starch-based process.
Published Version
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