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RIVM report 773301 001 / NRP report 410200 051 page 73 of 142
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The methodology used for the calculation of CH 4 emissions from landfills in EDGAR 3.0 is aILUVW
RUGHUGHFD\PRGHOresembling the description in the 5HYLVHG,3&&*XLGHOLQHV of the more complex
Tier 2 method, taking into account that the generation of methane from landfills is not an
instantaneous process. Thus, the methodology calculates emissions in a specific year as the sum of
delayed emissions from all MSW deposited in past years. We use a 40-year integration period,
assuming emissions from MSW deposited more than 40 years ago are negligible:
Methane generated G(t) = S
40
x = 1
-k (t-x)
D(x) * k* L 0 *N* e
where:
G(t) = CH 4 generated in year W [Gg/yr]
D(x) = MSW Tot (t) * MSW Fr (t) [Gg/yr]
where:
MSW Tot (t) = Total MSW generated [Gg/yr]
MSW Fr (t) = Fraction of MSW disposed to landfills
k = methane generation rate constant = ln 2 / HL [1/yr]
where HL = Half Life value
L 0 = methane generation potential = MCF*DOC(t)*DOC Fr *F*16/12 [Gg CH 4 /Gg waste]
where:
MCF = Methane Correction Factor [fraction]
DOC(t) = Fraction of 'HJUDGDEOH2UJDQLF&DUERQ in MSW [Gg C/Gg waste]
DOC Fr = Fraction of DOC ultimately dissimilated (excl. lignin C); GHIDXOW
F = Fraction of CH 4 in landfill gas; GHIDXOW (IPCC default is 0.5)
N = normalisation factor = ( 1 - e -k ) / k ; to ensure that the sum years the correct value of
the methane generation potential L 0 .