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Continuous ethanol production from sugarcane molasses using a newly designed combined bioreactor system by immobilized S accharomyces cerevisiae
Author(s) -
Xu Wanxia,
Liang Lei,
Song Zhentao,
Zhu Mingjun
Publication year - 2014
Publication title -
biotechnology and applied biochemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.468
H-Index - 70
eISSN - 1470-8744
pISSN - 0885-4513
DOI - 10.1002/bab.1175
Subject(s) - fermentation , bioreactor , chemistry , ethanol , ethanol fermentation , ethanol fuel , sugar , yeast , food science , dilution , polyvinyl alcohol , yield (engineering) , biochemistry , materials science , organic chemistry , physics , metallurgy , thermodynamics
Continuous ethanol fermentation using polyvinyl alcohol ( PVA ), immobilized yeast, and sugarcane molasses (22 and 35°Bx) with 8 g/L urea was run in a combined bioreactor system consisting of three‐stage tubular bioreactors in series. The effect of the dilution rate ( D ) at 0.0037, 0.0075, 0.0117, 0.0145, 0.018 , and 0.0282 H −1 on continuous ethanol fermentation was investigated in this study. The results showed that D had a significant effect on fermentation efficiency, sugar‐utilized rate, ethanol yield, and ethanol productivity in this designed continuous fermentation system. The D had a linear relationship with residual sugar and ethanol production under certain conditions. The highest fermentation efficiency of 83.26%, ethanol yield of 0.44 g/g, and the lowest residual sugar content of 6.50 g/L were achieved at 0.0037 H −1 in the fermentation of 22°Bx molasses, indicating that the immobilization of cells using PVA , sugarcane pieces, and cotton towel is feasible and the established continuous system performs well.