Roosevelt Regional Landfill Energy Recovery Facility

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Roosevelt Regional LandfillEnergy Recovery
Facility
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H.W. Hill Landfill GasPower Plant

• Plant Dedicated - June 1999

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Roosevelt Regional Landfill

• Allied Wastes Roosevelt Regional Landfill began
  accepting waste in 1991
• Over 240 million cy (cubic yards) of permitted
  airspace
• Through 2007 approximately 35 million cy of
  consumed airspace with over 170 million cy
  remaining
• Over 75 years of remaining site life at current
  waste acceptance rates (2.5 million tons/year)
  and density

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Where Does the Waste Come From?

• 97 of our waste comes by train via the BNSF
  system
• Waste comes from Washington, Alaska, Canada,
  Oregon
• Each day, about 250 containers arrive, each
  bearing 30 tons of solid waste 7,500 tons/work
  day

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What is Landfill Gas?

• Natural byproduct of solid waste decomposition
• 55 methane, 45 carbon dioxide, trace other
  compounds
• Methane is a destructive greenhouse gas -- 20
  times more destructive than carbon dioxide
• Methane is an explosive gas and must be
  controlled to comply with air permits
• Methane is an opportunity as a source of fuel to
  produce clean renewable energy

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Landfill Gas Collection

• Thousands of feet of perforated High Density
  Polyethylene (HDPE) pipe collects the gas
• Pipe is installed in the landfill as it grows
• Blowers create a vacuum on the pipe, drawing out
  the landfill gas
• The collection system inhibits the release of
  greenhouse gas, helps maintain permit compliance,
  and supplies gas to the power plant to generate
  renewable energy

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Gas to Energy Plant

• Owned and operated by the Klickitat Public
  Utility District
• Located on property leased from AW within the
  landfill permit boundary
• Operates under independent air permits
• The public/private KPUD/AW partnership is key to
  the success of the system

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Engines

• Generation Building houses 5 Waukesha
  spark-ignited, twin turbo-charged engines
  designed to run on methane
• Engines are 12 cylinder, 13,048 cubic inches
  displacement, 2,970hp, and a 10.83 bore x 11.81
  stroke
• For comparison, a typical 4 cylinder engine in a
  family car (I.e. Toyota Camry) has 4 cylinders,
  145 cubic inches displacement, 160hp, and a 3.5
  bore x 3.75 stroke

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Generators

• Mounted on each engine is a 2 megawatt generator,
  generating at 4,160 volts
• Each engine-generator can produce 48,000 kilowatt
  hours/day
• The plant operates at over 95 efficiency
  averaging more than 9.5 MW of electricity
  generation continuously
• Power for more than 6,000 homes

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Water Separator Tank

• Gas is sent to the power plant via a 24-inch pipe
• First stop Cyclone separator tank, this device
  spins the gas and some of the impurities fall out
  with the condensate.
• Landfill gas is corrosive and hard on engines --
  this process increases engine efficiency and
  prolongs engine life
• From the water knock-out tank, the gas enters the
  Compression Building

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Gas Compression

• Inside the Compression Building, gas is
  compressed from 1 psi (pound/square inch) to 65
  psi
• Compression facilitates gas scrubbing and
  provides fuel at the proper pressure for engine
  operation
• Gas is also dried to remove moisture and some of
  the impurities

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Cooling and Refrigeration

• Behind the Compression Building, air coolers cool
  the gas from 190 to 100 degrees F
• Refrigeration unit chills gas from 100 to 40
  degrees F
• Cooling the gas forces any remaining moisture
  from the gas and allows some of the impurities to
  fall out with condensation
• Gas is reheated for its underground trip to the
  Generation Building

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Exhaust Units

• Behind the Generation Building, mufflers cut
  engine noise
• Radiators cool intake air after it is
  turbo-charged and before it enters the engines
• Radiators also dissipate excess engine heat

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Transmission and Usage

• A dedicated substation and transmission line take
  electricity from the plant to the power grid
• Current power sales customers
• Snohomish PUD, 5 mw
• Benton PUD, 1 mw
• Clallam PUD, 1 mw
• Pacific PUD, 0.3 mw
• Remainder is sold on the open market as clean
  renewable energy

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Future Power Potential

• As the landfill is filled, the system could
  generate up to 40MW -- power to serve 26,000
  homes
• Receiving about 2.5 Million tons/year of waste,
  the landfill has capacity to accept waste until
  about 2080
• After the landfill closes, some useful methane
  will continue to be produced for about 10 to 20
  years