Journal
BIOPROCESS AND BIOSYSTEMS ENGINEERING
Volume 39, Issue 7, Pages 1023-1032Publisher
SPRINGER
DOI: 10.1007/s00449-016-1580-2
Keywords
Ethanol; CaCO3; CaCl2; Xylose; Mixed cellulosic sugars; Productivity
Funding
- Ohio Agricultural Research and Development Center (OARDC)
- Hatch grant [OHO01333]
- ARS [813639, ARS-0427439] Funding Source: Federal RePORTER
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Studies were performed on the effect of CaCO3 and CaCl2 supplementation to fermentation medium for ethanol production from xylose, glucose, or their mixtures using Scheffersomyces (Pichia) stipitis. Both of these chemicals were found to improve maximum ethanol concentration and ethanol productivity. Use of xylose alone resulted in the production of 20.68 +/- 0.44 g L-1 ethanol with a productivity of 0.17 +/- 0.00 g L-1 h(-1), while xylose plus 3 g L-1 CaCO3 resulted in the production of 24.68 +/- 0.75 g L-1 ethanol with a productivity of 0.21 +/- 0.01 g L-1 h(-1). Use of xylose plus glucose in combination with 3 g L-1 CaCO3 resulted in the production of 47.37 +/- 0.55 g L-1 ethanol (aerobic culture), thus resulting in an ethanol productivity of 0.39 +/- 0.00 g L-1 h(-1). These values are 229 % of that achieved in xylose medium. Supplementation of xylose and glucose medium with 0.40 g L-1 CaCl2 resulted in the production of 44.84 +/- 0.28 g L-1 ethanol with a productivity of 0.37 +/- 0.02 g L-1 h(-1). Use of glucose plus 3 g L-1 CaCO3 resulted in the production of 57.39 +/- 1.41 g L-1 ethanol under micro-aerophilic conditions. These results indicate that supplementation of cellulosic sugars in the fermentation mediumwith CaCO3 and CaCl2 would improve economics of ethanol production from agricultural residues.
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