초록
<P><B>Abstract</B></P> <P>The production of bioethanol and subsequent methane from two raw switchgrass varieties with the addition of cellulase and β-glucosidase dose combinations was investigated in this study. Maximum ethanol production increment for the investigated varieties, Shawneé and Kanlow, were determined as 211.9% and 166.7%, respectively, compared to the control assays without enzymes. Considering higher ethanol production a priority, 42.0 mg EtOH/gVS and 223.5 mLCH<SUB>4</SUB>/gVS were produced from Shawneé variety at 50 EGU cellulase – 80 IU β-glucosidase doses. 20.2 mgEtOH/gVS, and 400.7 mLCH<SUB>4</SUB>/gVS were produced from Kanlow variety at 75 EGU cellulase – 80 IU β-Glucosidase doses. Furthermore, the highest total biofuel energy productions were found as 10750,9 MJ/tonne field dried switchgrass at 75 EGU cellulase – 20 IU β-glucosidase doses for Shawneé and 13556,9 MJ/tonne field dried switchgrass at 75 EGU cellulase – 80 IU β-glucosidase doses for Kanlow. Shawneé variety was found to be more suitable for cellulosic ethanol production.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ethanol and methane production from Shawneé and Kanlow were reported first time. </LI> <LI> Cellulase and β-glucosidase dose impact on switchgrass were evaluated first time. </LI> <LI> Highest biofuel productions for varieties were observed at different enzyme doses. </LI> <LI> Biofuel productions were 10750.9 and 13556.9 MJ/tonne for Shawneé and Kanlow. </LI> <LI> Due to its low enzyme resistance, Shawneé is more suitable for ethanol production. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>