Denmark's National Inventory Report 2005 - Submitted under the ...

Table 8.6. ISAG waste types and their content (fraction) of waste types with calculated emission factor.
Waste Card- Paper Wet Plastics Other Glass Metal Other not Sum
food board Card- Combu- Combuboard
stible stible
Materiale fractions in and paper
Domestic Waste 0,38 0,02 0,13 0,26 0,07 0,03 0,02 0,05 0,05 1,00
Bulky Waste 0,08 0,23 0,05 0,46 0,09 0,09 0,02 1,00
garden Waste 0,76 0,24 1,00
Commercial & office Waste 0,25 0,31 0,04 0,11 0,05 0,10 0,05 0,05 0,05 1,00
Industrial Waste 0,06 0,02 0,07 0,01 0,01 0,06 0,04 0,18 0,54 1,00
Building & constr. Waste 0,07 0,93 1,00
Sludge 0,29 0,71 1,00
Ash & slag 1,00 1,00
Table 8.6 forms the connection between the ISAG data (left column) and waste type (upper row)
where emission factors have been worked out (Table 8.5). This composition is kept for the whole
time-series.
The emission factors for the ISAG waste types are now calculated as the weighted average according
to Table 8.5 and Table 8.6. The result is shown in Table 8.7.
Table 8.7. Emission factor (kg CH 4 /kg waste) for ISAG waste types.
ISAG Waste Type
Domestic Bulky Garden Commercial Industrial Building Sludge Ash &
Waste Waste Waste & office Waste & Construct. Slag
Waste Waste
Weighted emission factor 0.0068 0.094 0.051 0.079 0.022 0.0076 0.045 0.0
The detailed explanation on the composition of waste and the methodology to obtain emission
factors in this section of the NIR report have also been given since we do not find it descriptive for
the Danish data and for the methodology used to estimate and to fill out the part of CRF Table
6A,C called “additional information” on composition of waste.
8.2.2.2 The model and its results
The CH emission estimates from SWDSs are based on a First Order Decay (FOD) model suited to
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Danish conditions and according to an IPCC Tier 2 approach. The input parameters for the model
are yearly amounts of waste as reported to the ISAG database and the emission factors according
to Table 8.7. In the model is used a Half-life time of the carbon of 10 years, corresponding to (refer
GPG page 5.7):
k=ln2/10=0.0693 year -1
which is in line with values mentioned in the GPG and close to the GPG default value of 0.05.
The model calculations are not performed per dumping site, but for all waste dumped at all sites.
The yearly amounts of the different waste types and their emission factors are used to calculate the
yearly potential emission. From the potential emission the annual emission is calculated using the
model. This emission is withdrawn the CH 4 captured by biogas installations at some of the sites.
The result is annual net emissions. The captured amounts of CH 4 are according to the Danish energy
statistics. The waste amounts and the calculated CH 4 emissions are shown in Table 8.8.
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