LAUSR

Abstract 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, Shawnee 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 mLCH4/gVS were produced from Shawnee variety at 50 EGU cellulase – 80 IU β-glucosidase doses. 20.2 mgEtOH/gVS, and 400.7 mLCH4/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 Shawnee and 13556,9 MJ/tonne field dried switchgrass at 75 EGU cellulase – 80 IU β-glucosidase doses for Kanlow. Shawnee variety was found to be more suitable for cellulosic ethanol production.