OCSD Case Study: Hydrogen from Sewage fuel cell technology

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OCSD Case StudyHydrogen from Sewage
SCAP Energy Management Committee Meeting July 28,
2009
Layne BaroldiEnvironmental and Regulatory
Affairs SupervisorOrange County Sanitation
District
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OCSD Service Area471 square miles 220 million
gallons per day 2.5 million population 21 cities
, 3 special districts568 miles sewer lines 16
pumping facilities 2 treatment plants
Orange County,California
ReclamationPlant No. 1
TreatmentPlant No. 2
PacificOcean
Ocean Pipeline
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Wastewater Plant Diagram
Influent
Effluent
PreliminaryTreatment
PrimaryTreatment
SecondaryTreatment
SolidsProcessing
Central PowerGeneration SystemEngines
SolidsReuse
SolidsDewatering
Digestors
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Full-scale Hydrogen Energy Station

• 300kW molten carbonate fuel cell
• From digester gas
• Natural gas as a back up fuel source
• Co-produce electric power, hydrogen and thermal
  energy

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Participants
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12-Month Study

• Determine quantity and quality of hydrogen
• Maximize electricity and hydrogen
• Optimize process efficiency
• Establish a hydrogenfueling station
• Analyze data to determine economic and
  environmental benefits

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Environmental Goals

• Create an alternativeto gasoline
• Governors Hydrogen Highway
• Emissions reduction from digester gas combustion
• Clean / renewable energy source

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Renewable H2 Energy Station Vision
TreatmentPlant
Heat
Power
Biogas
Heat
SolidsTreatment
HydrogenFuelingStation
Digesters Natural gas (backup)
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Hydrogen Co-Production using MCFC
Air
WGS Shift
Biogas
Heat Exchangers

• Heat recovery
• Water gas shift
• Cooling and water recovery
• Hydrogen recovery
• Tailgas integration

H2 Purification
Hydrogen
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Digester Gas Fed DFC Power Plants
Wastewater Treatment, Santa Barbara, CA
Sierra Nevada Brewery, CA
Kirin Brewery, Japan
Provided by
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Fuel Cells can contributeto reducing targeted
emissions
Target Reduction Fuel Cell Reduction
VOCs 250 to 30 ppm (88) VOC ND NOx 40
to 11 ppm (73) NOx 0.3 ppm CO 600 to 200
ppm (67) CO 10 ppm
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Layne Baroldi(714) 593-7456 lbaroldi_at_ocsd.com
Orange County Sanitation Districtwww.ocsd.com
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Central Power Generation Systemat Plant No .1
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CNG Facility
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CNG Dispensers
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