Biomass has been identified as alternative renewable energy resource to replace 30%transportation fossil fuel through biofuels by 2.025.Big bluestem is a warm season native perennial grass warrants attention and studi...Biomass has been identified as alternative renewable energy resource to replace 30%transportation fossil fuel through biofuels by 2.025.Big bluestem is a warm season native perennial grass warrants attention and studies revealed its potential as energy feedstock.Extrusion pretreatments employed on big bluestem showed a significant improvement on sugar recovery.The current study was undertaken to understand and optimize pretreatment conditions such as barrel temperature(45-225℃),screw speed(20-200 r/min),moisture content(10%-50%w.b.),and particle size(2-10 mm)for maximum sugar recovery from big bluestem;and to propose a model to predict the glucose,xylose,and combined sugar recovery.Statistical analyses confirmed that all the independent variables included in this study had a strong influence on sugar recovery.A quadratic polynomial model was proposed to predict the glucose,xylose,and combined sugar recoveries from big bluestem,which had high F and R2 values with low p values.The optimum pretreatment conditions such as barrel temperature 180℃,screw speed 150 r/min,moisture content 20%w.b.,and particle size 8 mm resulted in maximum glucose,xylose,and combined sugar recoveries of 71.3%,78.5%,and 56.9%,respectively.Surface area of the optimum pretreated big bluestem increased 68.5%than that of control sample,which is the main cause for increase in sugar recovery.展开更多
基金supported by funding from the Agricultural Experiment Station and North Central Sun Grant Center at South Dakota State University through a grant provided by the US Department of Transportation,Office of the Secretary,Grant No.DTOS59-07-G-00054.
文摘Biomass has been identified as alternative renewable energy resource to replace 30%transportation fossil fuel through biofuels by 2.025.Big bluestem is a warm season native perennial grass warrants attention and studies revealed its potential as energy feedstock.Extrusion pretreatments employed on big bluestem showed a significant improvement on sugar recovery.The current study was undertaken to understand and optimize pretreatment conditions such as barrel temperature(45-225℃),screw speed(20-200 r/min),moisture content(10%-50%w.b.),and particle size(2-10 mm)for maximum sugar recovery from big bluestem;and to propose a model to predict the glucose,xylose,and combined sugar recovery.Statistical analyses confirmed that all the independent variables included in this study had a strong influence on sugar recovery.A quadratic polynomial model was proposed to predict the glucose,xylose,and combined sugar recoveries from big bluestem,which had high F and R2 values with low p values.The optimum pretreatment conditions such as barrel temperature 180℃,screw speed 150 r/min,moisture content 20%w.b.,and particle size 8 mm resulted in maximum glucose,xylose,and combined sugar recoveries of 71.3%,78.5%,and 56.9%,respectively.Surface area of the optimum pretreated big bluestem increased 68.5%than that of control sample,which is the main cause for increase in sugar recovery.
