Bioethanol production from sugarcane leaf waste: Effect of various optimized pretreatments and fermentation conditions on process kinetics

摘要

This study examines the kinetics of S. cerevisiae BY4743 growth and bioethanol production from sugarcane leaf waste (SLW), utilizing two different optimized pretreatment regimes; under two fermentation modes: steam salt-alkali filtered enzymatic hydrolysate (SSA-F), steam salt-alkali unfiltered (SSA-U), microwave salt-alkali filtered (MSA-F) and microwave salt-alkali unfiltered (MSA-U). The kinetic coefficients were determined by fitting the Monod, modified Gompertz and logistic models to the experimental data with high coefficients of determination Rsup2/sup 0.97. A maximum specific growth rate (μ submax/sub ) of 0.153?hsup?1/sup was obtained under SSA-F and SSA-U whereas, 0.150?hsup?1/sup was observed with MSA-F and MSA-U. SSA-U gave a potential maximum bioethanol concentration (Psubm/sub) of 31.06?g/L compared to 30.49, 23.26 and 21.79?g/L for SSA-F, MSA-F and MSA-U respectively. An insignificant difference was observed in the μ submax/sub and P subm/sub for the filtered and unfiltered enzymatic hydrolysate for both SSA and MSA pretreatments, thus potentially reducing a unit operation. These findings provide significant insights for process scale up.