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Estimating Greenhouse Gas Emissions in Corn-Ethanol Production using the BESS Model Adam J. Liska, Haishun S. Yang, Kenneth G. Cassman Department of Agronomy.

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Presentation on theme: "Estimating Greenhouse Gas Emissions in Corn-Ethanol Production using the BESS Model Adam J. Liska, Haishun S. Yang, Kenneth G. Cassman Department of Agronomy."— Presentation transcript:

1 Estimating Greenhouse Gas Emissions in Corn-Ethanol Production using the BESS Model Adam J. Liska, Haishun S. Yang, Kenneth G. Cassman Department of Agronomy and Horticulture, University of Nebraska-Lincoln

2 BESS Model : Life-Cycle Energy & Emissions BESS Model includes 4 components: Crop production Ethanol biorefinery Cattle feedlot for feeding co-product distiller’s grains Anaerobic digestion unit (optional, closed-loop facility) Three types of life-cycle analysis: Energy analysis—life-cycle net energy yield & efficiency Emissions analysis—net carbon dioxide (CO 2 ) and trace greenhouse gases (CH 4, N 2 O), and global warming potentional (GWP) Resource Requirements—crop production area, grain, water, fossil fuels (petroleum, nat. gas, and coal)

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10 BESS results: Net Energy Ratio USA average NE average Iowa average coal1.401.331.46 natural gas1.491.411.57 natural gas, wet DG1.851.731.97 closed-loop facility2.452.172.71 Corn Production System Ethanol Biorefineries www.bess.unl.edu

11 GHG Emissions Reduction (%) USA average NE average Iowa average coal262429 natural gas525055 natural gas, wet DG656367 closed-loop facility787581 Corn Production System Ethanol Biorefineries www.bess.unl.edu

12 BESS Results: Default Scenarios #2-4 www.bess.unl.edu

13 GHG-intensity of Corn production: BESS results Life-cycle GHG reduction compared to gasoline; w/ natural gas ethanol plant with dry distillers grains

14 Support for BESS Development Western Governor’s Association Nebraska Energy Office Environmental Defense Nebraska Center for Energy Sciences Research University of Nebraska-Lincoln, Institute of Agriculture and Natural Resources FREE Model Download: www.bess.unl.edu


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