Environmental Life Cycle Assessments of Biofuels
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1 Environmental Life Cycle Assessments of Biofuels David R. Shonnard, Ph.D. Robbins Chair Professor Department of Chemical Engineering Michigan Technological University Director,
2 Michigan Tech
3 Michigan Tech Statistics Established in 1885 to support the Mining Industry 7000 students (~1300 grad students) ~60% engineering students one of the largest engineering Colleges in U.S. 1 st Tier of US National Universities (US News, 2012) 64 th Best in Engineering (US News, 2012) Top 10 Technological Universities (Money) Top 10 Safest University in USA 95% Placement Rate for Graduate Employment Intellectual Property 3x national average in generating licenses
4 Overview of Presentation Introduction to Energy Sustainability Sustainability Issues for Biofuels and Bioenergy Biomass Feedstock Availability (USA and China) Conversion Pathways for Biofuels Introduction to Biofuel Life Cycle Assessment (LCA) Overview of LCA Results Integrated Biofuel Research with Examples
5 Managing the Carbon Cycle: A Sustainable Energy Challenge From Combustion of Fossil Fuels acts as a Carbon Pump
6 CO 2 and Temperature in the Northern Hemisphere are Rising National Geographic, September 2004, pg 20, National Geographic Society, Washington, D.C.
7 Wood-to-Wheels (W2W) Concept Research Thematic Areas Sustainability Assessments / Decision-Making Bio-Processing Research Photo: Glacial Lakes Energy CO 2 Woody Biomass Resource Research Vehicle Systems Research
8 Renewable Fuel Standard in USA
9 But, How Much Biomass is Available on an Annual Basis in the USA? U.S. Department of Energy U.S. Billion-Ton Update: Biomass Supply for a Bioenergy and Bioproducts Industry. R.D. Perlack and B.J. Stokes, ORNL/TM-2011/224. Oak Ridge National Laboratory, Oak Ridge, TN. 227p.
10 But, How Much Biomass is Available on an Annual Basis in the USA? Oil seed crops (rapeseed, etc.) Corn stover (stalk of the plant) Wheat straw U.S. Department of Energy U.S. Billion-Ton Update: Biomass Supply for a Bioenergy and Bioproducts Industry. R.D. Perlack and B.J. Stokes, ORNL/TM-2011/224. Oak Ridge National Laboratory, Oak Ridge, TN. 227p.
11 But, How Much Biomass is Available on an Annual Basis in the USA? Switchgrass, miscanthus Hybrid poplar and willow U.S. Department of Energy U.S. Billion-Ton Update: Biomass Supply for a Bioenergy and Bioproducts Industry. R.D. Perlack and B.J. Stokes, ORNL/TM-2011/224. Oak Ridge National Laboratory, Oak Ridge, TN. 227p.
12 And, How Much Biomass is Available on an Annual Basis in China? The Renewable Energy Law of China Bio-ethanol 10 Mt/yr by 2020 Sweet Sorghum Sugarcane Maize Wheat Sweet Potato Cassava Bio-diesel 2 Mt/yr by 2020 Jatropha Oil Vegetable Cottonseed Coptistree Yellowhorn 35 million hectares total area for potential biofuel production Type I-III lands 175 million tons ethanol assuming 5 t ethanol/ha (sweet sorgum) Biomass Initiative Inventory in China, Task Force on Sustainability of GBEP, Wang and Ma, 2008
13 Biofuel Conversion Pathways Shonnard, D.R., Campbell, M. Brodeur-, Martin-Garcia, A.R., Kalnes, T.K., (2012),Chemical Engineering of Bioenergy Plants: Concepts and Strategies, in Vol. 1 Handbook of Bioenergy Crop Plants, Kole, C., Joshi, C., Shonnard, D.R. Eds., CRC Press-Taylor and Francis, Boca Raton, FL, Conventional Biofuels Biochemical Corn, Sugar beets Sugar cane Enzymatic Hydrolysis Glucose, Sucrose Fermentation Ethanol, DDGS Thermochemical Triglycerides: soybean, rape seed, palm Solvent Extraction Plant Bio-oil Transesterification Biodiesel, Glycerol, Soymeal Advanced Biofuels Biochemical Lignocellulosic Feedstocks Thermochemical Triglycerides: camelina, algae, tallow, jatropha Chemical Hydrolysis Solvent Extraction Glucose Xylose Galactose Arabinose Mannose Bio-oil Enzyme Hydrolysis, Fermentation Hydrotreatment Ethanol, Butanol, Hydrocarbons Hydrocarbon Biofuels Lignocellulosic Feedstocks Gasification Pyrolysis, Hydropyrolysis Synthesis Gas Py-Oil HydroPy-Oil Fischer-Tropsch Hydrotreatment Hydrocarbon Biofuels Biomass Pretreatment Intermediates Conversion Biofuels
14 Categories for indicators of environmental and socioeconomic sustainability Productivity Greenhouse gas emissions Soil quality Social acceptability Social well being External trade Biological diversity Air quality Water quality and quantity Resource conservation Profitability Energy security McBride et al. (2011) Ecological Indicators 11: Oak Ridge National Laboratory Dale et al. (In review) Ecological Indicators Example of one category: soil quality Indicator Units Total organic carbon (TOC) Mg/ha Total nitrogen (N) Mg/ha Extractable phosphorus (P) Mg/ha Bulk density g/cm 3
15 Introduction: Biofuel Environmental LCA Stratton, Wong, and Heilman, MIT,, PARTNER Project 28 Report: Life Cycle Greenhouse Gas Emissions from Alternative Jet Fuels
16 Energy Allocation Method (DOE, EC) Functional Unit: 1 MJ of biofuel Algae Cake Export Co-Product Fuels, Chemicals Biomass Biomass Oil Oil Algae Cultivation Harvesting Algae Biomass Transport Algae Oil Extraction Algae Oil Transport Algae Green Fuel Production Green Fuel Fertilizers Heat Electricity N 2 O Infrastructure? Diesel and Combustion Hexane Heat from Natural Gas Electricity Diesel and Combustion = GHG Impact (g CO 2 eq./mj Green Fuel) Hydrogen Heat from Natural Gas Electricity Fuel Gas and Combustion Water Chemicals 16
17 Displacement Allocation Method (EPA) Functional Unit: 1 MJ of biofuel Algae Cake Export Co-Product Fuels Biomass Biomass Oil Oil - = Algae Cultivation / Harvest Algae Biomass Transport Algae Oil Extraction Algae Oil Transport Algae Green Fuel Production Green Fuel 17 Fertilizers Heat Electricity N 2 O?? Infrastructure? Diesel and Combustion = GHG Impact (g CO 2 eq./mj Green Jet) Hexane Heat from Natural Gas Electricity Diesel and Combustion = GHG Credit (g CO 2 eq./mj Green Jet) Hydrogen Heat from Natural Gas Electricity Fuel Gas and Combustion Water Chemicals
18 Some Biofuel LCA Results Greenhouse Gas (GHG) Emissions kg CO 2 eq./mj Petroleum Diesel FT Syndiesel from Coal FT Syndiesel from NG FT Syndiesel from Wood CONCAWE RSO Biodiesel CONCAWE RSO GD Koers, K.P., Kalnes, T.N., Marker, T., Shonnard, D.R. (2009), Green diesel: A technoeconomic and environmental life cycle comparison to biodiesel and syndiesel, Environmental Progress & Sustainable Energy, 28(1),
19 Some Biofuel LCA Results Cumulative Energy Demand 2.50 MJ (input) / MJ (output) Petroleum Diesel FT Syndiesel from Coal FT Syndiesel from NG FT Syndiesel from Wood Non renewable, fossil Renewable, biomass Other CONCAWE RSO Biodiesel CONCAWE RSO GD Koers, K.P., Kalnes, T.N., Marker, T., Shonnard, D.R. (2009), Green diesel: A technoeconomic and environmental life cycle comparison to biodiesel and syndiesel, Environmental Progress & Sustainable Energy, 28(1),
20 Integrated Biofuels Research Potential Benefits to Society Current technology: 30% gasoline displacement Improved technology: > 60% displacement Achievable Using Existing Cell. EtOH Technologies Improved Biomass Productivity Improved Bioprocessing Efficiency x x x Improved Engine/ Vehicle Efficiencies 30% 37% 48% 63% Petroleum Gasoline Cell. EtOH
21 NSF Sustainable Energy Pathways Wood-to-Wheels: Forest-Based Biofuels (Green Diesel) Research driven by the need to understand and manage molecular identity
22 Pan American Biofuels and Bioenergy Sustainability Research Coordination Network (RCN) D. Shonnard, R.P. Donovan, K. Halvorsen, B. Solomon, S. Sweitz, (50 others) National Science Foundation: CBET , 01/01/12-12/31/15 Workshop (4) Houghton Conference (3) Brazil Workshop (1) Merida a. Community impacts, b. water / energy nexus, c. biodiversity / ecosystems d. energy policy, e. life cycle assessment, f. food and other systems, g. biogeochemical cycles, and h. biomass supply transportation logistics. Workshop (2) Buenos Aires
23 Funding Sources Richard and Bonny Robbins Endowment Shonnard Research Group, 2010
24 Thank You!
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