초록
Sodium hydroxide (NaOH) and lime (Ca(OH)<SUB>2</SUB>) were innovatively used together in this study to improve the cost-effectiveness of alkaline pretreatment of switchgrass at ambient temperature. Based on the sugar production in enzymatic hydrolysis, the best pretreatment conditions were determined as: residence time of 6h, NaOH loading of 0.10g/g raw biomass, NaOH addition at the beginning, Ca(OH)<SUB>2</SUB> loading of 0.02g/g raw biomass, and biomass wash intensity of 100ml water/g raw biomass, at which the glucose and xylose yields were respectively 59.4% and 57.3% of the theoretical yields. The sugar yield of the biomass pretreated using the combination of 0.10g NaOH/g raw biomass and 0.02g Ca(OH)<SUB>2</SUB>/g raw biomass was found comparable with that of the biomass pretreated using 0.20g NaOH/g raw biomass at the same conditions, while the chemical expense was remarkably reduced due to the low cost of lime and the reduced loading of NaOH.