Methane Emissions from Landfills by EPADocs

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									           Methane
         Emissions from
            Landfills
  Melissa Weitz
    U.S. EPA
LMOP Conference
      2007
Landfill Gas
 ~ 50%                     ~ 50%
 Methane (CH4)             Carbon Dioxide (CO2)

 Global Warming            Global Warming
 Potential of 21           Potential of 1

 Anthropogenic             Biogenic
 – Formed as a result of   – Waste would have
   management of wastes      produced CO2 without
   by humans                 human management
Source: EPA compilation 2002
     Projected Global Emissions of CH4
         from Solid Waste Disposal




EPA (2006) Global Anthropogenic Non-CO2 Greenhouse Gas Emissions: 1990-2020
   U.S. National Methane Emissions




•Landfills largest anthropogenic source of CH4: 140.9 TgCO2e
emitted in 2004 From Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2004
Emissions Avoided by CH4 Recovery
Example from 2004 emissions calculations (Tg CO2e)

    MSW Landfills                   251.2
    Industrial Landfills             17.6
    Total Potential Emissions       268.8
    Recovered
      Gas-to-Energy                 (59.7)
      Flared                        (52.5)
    Oxidized                        (15.7)
    Total Reductions              (127.9)
    Net Emissions                   140.9
                          CH4 Recovery
                            (TgCO2e)




                 0
                     20
                          40
                               60
                                    80
                                         100
                                               120
          1990
          1991
          1992
          1993
          1994
          1995




Flaring
          1996
          1997
          1998




LFGTE
          1999
          2000
          2001
          2002
          2003
          2004
                                                     CH4 Recovery is Increasing
Effect of CH4 Recovery on National
Landfill Emissions
                        300
Landfill CH4 Emission




                        250

                        200
      (TgCO2e)




                        150
                        100

                        50

                         0
                              1990
                                     1991
                                             1992
                                                    1993
                                                           1994
                                                                  1995
                                                                         1996
                                                                                 1997
                                                                                        1998
                                                                                               1999

                                                                                                      2000
                                                                                                             2001
                                                                                                                    2002
                                                                                                                           2003
                                                                                                                                  2004
                                            CH4 Emissions                       Without recovery
 For more information
U.S. Greenhouse Gas Emissions:
http://www.epa.gov/climatechange/emissions/
usinventoryreport.html

International Greenhouse Gas Emissions:
http://www.epa.gov/nonco2/econ-
inv/international.html#global_anthropogenic


             Melissa Weitz
         Weitz.Melissa@epa.gov

								
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