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Comparative study on enzymatic digestibility of switchgrass varieties and harvests processed by leading pretreatment technologies |
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| Authors: | Kim Youngmi Mosier Nathan S Ladisch Michael R Pallapolu V Ramesh Lee Y Y Garlock Rebecca Balan Venkatesh Dale Bruce E Donohoe Bryon S Vinzant Todd B Elander Richard T Falls Matthew Sierra Rocio Holtzapple Mark T Shi Jian Ebrik Mirvat A Redmond Tim Yang Bin Wyman Charles E Warner Ryan E |
| Institution: | a Laboratory of Renewable Resources Engineering, Potter Engineering Center, 500 Central Drive, Purdue University, West Lafayette, IN 47907-2022, United States b Department of Chemical Engineering, 212 Ross Hall, Auburn University, AL 36849, United States c Chemical Engineering and Materials Science, 3815 Technology Bldv, Michigan State University, Lansing, MI 48824, United States d National Renewable Energy Laboratory, 1617 Cole Bldv, Golden, CO 80401, United States e Department of Chemical Engineering, Texas A&M University, 3122 TAMU, College Station, TX 77843-3122, USA f Universidad de los Andes Chemical Engineering Department Grupo de Conversion de Energia, Bogotá, Colombia g Center for Environmental Research and Technology, Bourns College of Engineering, 1084 Columbia Avenue, University of California, Riverside, California 92507, United States h Genencor, A Danisco Division, 925 Page Mill Road, Palo Alto, CA 94304, United States |
| Abstract: | Feedstock quality of switchgrass for biofuel production depends on many factors such as morphological types, geographic origins, maturity, environmental and cultivation parameters, and storage. We report variability in compositions and enzymatic digestion efficiencies for three cultivars of switchgrass (Alamo, Dacotah and Shawnee), grown and harvested at different locations and seasons. Saccharification yields of switchgrass processed by different pretreatment technologies (AFEX, dilute sulfuric acid, liquid hot water, lime, and soaking in aqueous ammonia) are compared in regards to switchgrass genotypes and harvest seasons. Despite its higher cellulose content per dry mass, Dacotah switchgrass harvested after wintering consistently gave a lower saccharification yield than the other two varieties harvested in the fall. The recalcitrance of upland cultivars and over-wintered switchgrass may require more severe pretreatment conditions. We discuss the key features of different pretreatment technologies and differences in switchgrass cultivars and harvest seasons on hydrolysis performance for the applied pretreatment methods. |
| Keywords: | Pretreatment Switchgrass Ethanol Lignocellulose Harvest season |
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