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An Integrated Bioenergy System at UW-Platteville
Chris BaxterUW-Platteville School of Agriculture
UW-Extension Nutrient Management
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Project History
• WI Focus on Energy Grant to study feasibility of anaerobic digester systems - 2009– Large-scale “Community” Digester on UWP
Campus (~700 cows)– Small-scale digester on UWP farm (~150 cows)
• Large scale digester more economically feasible, logistically challenging
• Small scale digester not economically feasible as a stand-alone system
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Integrated Bioenergy System Concept
Soybeans
Oilseed extraction
Vegetable oilbiodiesel conversion
glycerine
manure
feed
Biogas & electricity
biodiesel
ENERGY!!!
Anaerobic digester
Livestock
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Components• Anaerobic digestion of dairy and beef manure
– System sized for 200 cows• Oilseed press and roaster :
– Production of raw oil and meal – Ability to test various oilseeds– Produce meal to meet farm livestock needs
• Biodiesel production system – up to 5000 gal/yr capacity
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Oilseed Press and Roaster• “Cold press” system
produces raw veg oil and high protein meal
• Raw oil must be allowed to settle and be filtered before use
• Roaster enhances feed value of meal – necessity for using as livestock feed
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Biodiesel Production • Process controlled,
minimizes handling of caustic ingredients
• Temperature controlled – speeds process and improves consistency
• Ability to make small batches (50 gal)– Ideal for
educational/research applications
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Anaerobic Digester
• Ability to handle non-manure substrates– Manure from
beef/swine– Glycerine– Cheese whey– Campus food waste
• ~100 kw turbine
• Waste Heat Recovery• Liquid-Solid separation
• Liquids - land spread• Solids – land spread,
use as bedding replacement, or develop into value-added product
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Potential for glycerol to increase methane production
0 10 20 30 40 50 600.000
0.100
0.200
0.300
0.400
0.500
0.600
0.700
Daily CH4 ProductionControl
1% pure
1% Crude
Day
L CH
4/L
. day
1.8 X
Oswald Wohlgemut (MSc, 2008), University of Manitoba
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Challenges to Overcome
• Integrated energy systems require a high level of management and knowledge of various farm production systems.
• Current energy prices make returns relatively low – long paypack periods
• Off-farm inputs must be stable, plentiful, and transportable.
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Potential Outcomes• A unique energy system unlike any currently in
operation• Demonstrate process integration – key to
profitable and sustainable systems on small farms.
• Outstanding educational opportunities for students in multiple majors
• Numerous research possibilities• First step toward development of a
community-based digester.
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Sustainable and Renewable Energy Systems Program
• Multi-disciplinary curriculum focused on Sustainable and Renewable Energy
• UWP already has a minor and is developing a new major (SRES)
• Current focus is on Science/Technology and Business/Management
• Student interest in this area is high.
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Questions?