Comparison of different pretreatments for the production of bioethanol and biomethane from corn stover and switchgrass.
In this study the efficiency of mild ionic liquid (IL) pretreatment and pressurized hot water (PHW) is evaluated and compared in terms of bioethanol and biomethane yields, with corn stover (CS) and switchgrass (SG) as model bioenergy crops. Both feedstocks pretreated with the IL 1-ethyl-3-methylimidazolium acetate [C2C1Im][OAc] at 100°C for 3h exhibited lower glucose yield that those treated with harsher pretreatment conditions previously used. Compared to PHW, IL pretreatment demonstrated higher bioethanol yields; moreover IL pretreatment enhanced biomethane production. Taking into consideration both bioethanol and biomethane productions, results indicated that when using IL pretreatment, the total energy produced per kg of total solids was higher compared to untreated biomasses. Specifically energy produced from CS and SG was +18.6% and +34.5% respectively, as compared to those obtained by hot water treatment, i.e. +2.3% and +23.4% for CS and SG, respectively.
University of California, Berkeley, 5885 Hollis St., Emeryville, CA, USA; Joint BioEnergy Institute, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, USA.
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Papa
Sandia National Laboratories, 7011 East Avenue, Livermore, CA, USA; Joint BioEnergy Institute, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, USA.
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Rodriguez
Sandia National Laboratories, 7011 East Avenue, Livermore, CA, USA; Joint BioEnergy Institute, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, USA.
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A
George
Gruppo Ricicla-DiSAA, Università degli Studi di Milano, via Celoria 20100, Milan, Italy.
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Schievano
Gruppo Ricicla-DiSAA, Università degli Studi di Milano, via Celoria 20100, Milan, Italy.
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Orzi
Sandia National Laboratories, 7011 East Avenue, Livermore, CA, USA; Joint BioEnergy Institute, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, USA.
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Sale
Sandia National Laboratories, 7011 East Avenue, Livermore, CA, USA; Joint BioEnergy Institute, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, USA.
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Singh
Gruppo Ricicla-DiSAA, Università degli Studi di Milano, via Celoria 20100, Milan, Italy. Electronic address: fabrizio.adani@unimi.it.
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Adani
Sandia National Laboratories, 7011 East Avenue, Livermore, CA, USA; Joint BioEnergy Institute, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, USA. Electronic address: basimmons@lbl.gov.
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Simmons
D000693:Anaerobiosis / Q000187:drug effects; D056804:Biofuels; D001709:Biotechnology / Q000379:methods*; D050260:Carbohydrate Metabolism / Q000187:drug effects; D000431:Ethanol / Q000378:metabolism*; D005285:Fermentation / Q000187:drug effects; D005936:Glucans / Q000032:analysis; D005947:Glucose / Q000378:metabolism; D006358:Hot Temperature; D052578:Ionic Liquids / Q000494:pharmacology; D007700:Kinetics; D008031:Lignin / Q000302:isolation & purification; D008697:Methane / Q000096:biosynthesis*; D010100:Oxygen / Q000032:analysis; D008897:Panicum / Q000737:chemistry*; D014866:Waste Products; D014867:Water / Q000494:pharmacology; D003313:Zea mays / Q000737:chemistry*
D056804:Biofuels; D005936:Glucans; D052578:Ionic Liquids; D014866:Waste Products; D014867:Water; D000431:Ethanol; D008031:Lignin; D005947:Glucose; D008697:Methane; D010100:Oxygen
Bioethanol; Biomass pretreatment; Biomethane; Ionic liquid pretreatment; Pressurized hot water pretreatment