Spatial distribution of emissions to air - the SPREAD model

46
cremated a year collected from the pet crematories are used for distribution
of the national emission.
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Compost production was not implemented in the reporting for 2008, but
as the data is available and will be included in future reporting this
source is implemented in SPREAD. The inventory for composting includes
emissions of CH4, CO, N2O and NH3. Compost production in
Denmark is dominated by garden and park waste, which mainly occurs
at a large number of recycling depots. In the present spatial distribution
emissions from compost production are distributed according to the areas
with one-storey buildings as the recycling depots are not geocoded
yet.
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Accidental fires are grouped in a number of categories covering vehicles,
detached houses, undetached houses, apartment buildings and industrial
buildings. The inventory include emissions of all pollutants except
N2O, NH3, Se, HCB and benzo(b)flouranthene due to lack of emission
factors. Geographical location of the fires is not yet included in the inventory
for accidental fires and the emission is distributed according to
the population distribution.
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The source called N2O from human sewage covers direct emissions from
wastewater treatment processes and indirect emissions from the outlet
wastewater. The calculated emissions are distributed between the
wastewater treatment plants according to BI5 in the same way as emissions
from wastewater treatment.
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Figure 7.1 shows the emissions of CH4 from the waste sector. The grid
cells with the largest emissions are enhanced with circular symbols. The
largest emissions occur at the point sources covering wastewater treatment
plants and solid waste disposals, the latter having the largest total
and site-specific emissions. Accidental fires are assumed to happen
where the population is located, which leads to emissions at almost the
entire land area.