Technologies for Anaerobic Digestion of Flushed Swine Manure
Recent Progress in Manure Digestion
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Transcript of Recent Progress in Manure Digestion
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Recent Progress in Manure Digestion
Produced by the Minnesota Department of Agriculture 2007Funding for this project was provided by (The Environment and Natural Resources Trust Fund) as recommended by the Legislative Commission on Minnesota Resources (LCMR)
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What’s New With Manure Digestion?
Haubenschild Farm Fuel Cell Project
LCMR’s European Digester Tour
Loan Program: How to Apply
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Haubenschild Farm Fuel Cell Project
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The 900-head dairy has a well-established manure digester
Biogas is being converted to electricity by a 130 kW engine generator
Digester produces excess biogas
Background on Haubenschild Dairy:
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Objectives:
Evaluate the feasibility of a fuel cell to convert biogas (methane) to electricity.
Next step may be to produce hydrogen for farm use from biogas.
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Procedures to Achieve Objective:
Develop biogas cleanup system Install fuel cell on digester Test the fuel cell Monitor systems for energy, consumption
and emissions
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Hydrogen sulfide removal- Initial concentration ~ 3000 ppm- Need concentration < 25 ppb
Carbon dioxide removal- Need concentration < 50,000 ppm (5%)
Moisture removal- Need dry gas
Challenges:
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Haubenschild Equipment Rooms
Building on right houses the fuel cell
Building on left houses the generator
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Emissions from Haubenschild Generator Vs. Plug PowerTM Proton Exchange Membrane (PEM) Fuel Cell
Engine Generator Fuel Cell _
CO (800 ppmv) 4.18 g/kWh (<1 ppmv) 0.014 g/kWh
NOX (2960 ppmv) 25.5 g/kWh (<1 ppmv) <.0023 g/kWh
SOX (277 ppmv) 3.34 g/kWh (<1 ppmv) <0.030 g/kWh
CXHY (20460 ppmv) 53 g/kWh (1790 ppmv) 14.5 g/kWh
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Need to receive more money for the electricity produced
Need a more stable gas cleanup system
Problems:
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Compress, transport and sell methane
Make and sell hydrogenGet more value and less
regulation
What Do We Do Now?
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Benefits
Reduces odors and emissionsPromotes rural economyReduces reliance on foreign fuelReduces soil and water pollution
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LCMR’s European Digester Tour
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-Most are mesophilic
-All are aboveground
-Have stirring devices
-Most are larger than Haubenschild’s digester
European Digesters:
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Many digesters use alternate waste streams of slaughterhouse wastes, other waste fats, or crops such as corn silage.
Corn silage is said to generate plenty of heat to operate the digester.
Alternate Waste Stream in Europe
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Community digesters receive manure from 18-60 farms.
Regulations encouraged community digesters by requiring 6 to 0 months of manure storage.
Storages were located in the fields where manure would be applied.
Community Digesters in Europe:
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Loan Programs: How to Apply
First determine the appropriateness of a certain system for your farm
Fill out loan or grant application
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Checklist to Evaluate the Likelihood of Heated Manure Digestion System Success
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Checklist to Evaluate the Likelihood of Heated Manure Digestion System Success (Continued)
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Grants and Loans Available:
Section 9006 Renewable Energy Systems and Energy Efficiency Improvements Grant Program
Minnesota Department of Agriculture (MDA) Methane Digester Loan Program
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Purpose: To assist projects in purchasing renewable energy systems and energy improvements
How: It offers grants and guaranteed loans
More Info and Application: http://www.rurdev.usda.gov/rbs/farmbill/
Section 9006: Renewable Energy and Energy Efficiency Program
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Purpose: Provide financial assistance for the construction of a system that produces electricity from manure
How: Revolving loan fund More Info and Application: http://
www.mda.state.mn.us /grants/loans/digester.htm
MDA Methane Digester Loan Program
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