1. Biogas Energy Potential in Florida
Ann C. Wilkie
Soil and Water Science Department
University of Florida – IFAS
Renewable Energy Workshop
Florida Public Service Commission
January 19, 2007

2. Biogas Cycle Solar energy Photosynthesis Animal husbandry
Electrical and/or thermal energy
Biofertilizer
Organic wastes
Anaerobic digestion
Biogas
Solar energy
Animal husbandry
Crop harvesting
Industrial processing
Human consumption
Photosynthesis
H2O
CO2
Biogas Cycle
Energy
crops

3. ANAEROBIC DIGESTION The microbial degradation of organic
compounds, in the absence of oxygen,
to biogas – a mixture of:
Methane (50 to 70%)
CO2 (30 to 50%)
trace amounts of H2, NH3, and H2S.

4. METHANE and CARBON DIOXIDE
LIQUEFACTION
PHASE
GASIFICATION
PHASE
COMPLEX
ORGANIC
MATTER
SIMPLE
ORGANICS
ACETATE
H2 / CO2
ACIDOGENS
METHANOGENS
METHANE and CARBON DIOXIDE
LOW ODOR EFFLUENT

5. FEEDSTOCKS Animal manures Industrial wastewaters Municipal wastewaters
Municipal solid wastes
Energy crops / crop residues

6. BENEFITS OF ANAEROBIC DIGESTION
Renewable energy
BOD/COD reduction
Odor reduction
Pathogen reduction
Nutrient conservation
Greenhouse gas reduction

7. BIOGAS – A BIOENERGY VECTOR
Direct Utilization (Heat / Steam)
Conversion to Bioelectricity (CHP)
Natural Gas Pipeline
Vehicular fuel
Fuel Cells
Methanol
Biodiesel

8. Biogas as fuel

9. Water heater at UF-IFAS Dairy powered by manure biogas

10. Natural Gas Bus - Brisbane

11. BIOGAS PLANT
CORE
TECHNOLOGY

12. DISTILLATION
ETHANOL
FERMENTATION
BIOGAS
STILLAGE
ANAEROBIC
DIGESTION

13. Biomass Energy Crop

14. Green Grass to Green Gas
SUNLIGHT
Green Grass to Green Gas
WATER
CO2
CO2
WATER
Energy
Crops
Biogas
Plant
Methane
Biofertilizer

15. Florida Biogas Potential from Selected Sources: Annual Estimates
Biomass or
Waste Source
Energy Production
Natural Gas Equivalent
(billion cu ft)
Electricity Equivalent
(Megawatts)
Municipal wastewater 1
5.52 63
Dairy manure 1
2.96 34
Poultry manure 1
2.7 31
MSW 1
27.5
314
Energy crops 2
167
1908
Total
205.7
2350
Time to Implement: 1 Immediate (1-5 years), 2 Near term (5-7 years)

16. Biogas is a sustainable energy solution that is:
Renewable
Carbon dioxide neutral
Locally based
thereby protecting the environment, creating jobs and strengthening local economies.

17. Biogas power provides …
Energy independence
Renewable natural gas
Energy reliability
Based on locally based feedstocks

18. IMPLEMENTATION ISSUES
Net metering
Surplus sales agreement
Standby charge
Rate schedule
Interconnection

19. Biogas Energy Potential in Florida
Ann C. Wilkie
Soil and Water Science Department
University of Florida – IFAS
Renewable Energy Workshop
Florida Public Service Commission
January 19, 2007