Optimization and techno-economic assessment of high-solid fed-batch saccharification and ethanol fermentation by Scheffersomyces stipitis and Saccharomyces cerevisiae consortium

Pornkamol Unrean and Sutamat Khajeeram

Renewable Energy, 2016, vol. 99, issue C, 1062-1072

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.

Keywords: High-solid fed-batch process; High-titer ethanol fermentation; Yeast consortium technology; Techno-economic analysis (search for similar items in EconPapers)
Date: 2016
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Citations: View citations in EconPapers (3)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:99:y:2016:i:c:p:1062-1072

DOI: 10.1016/j.renene.2016.08.019

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