In the analysis we’ve blocked the possibility of importing
waste to the system in study. This restriction has been
evaluated in a sensitive analysis, which shows that import of
waste for treatment in waste incineration within the system
give positive effects on the emissions of climate gases. The
main reason for this is that the import of waste results in
a decrease of the amount of waste going to landfills outside
the system. Since landfilling of organic waste result in high
emissions of climate gases it is highly desired to decrease this
activity.
IX. Composting of food waste and anaerobic digested sludge
from wastewater treatment also result in emissions of
substances that leads to eutrophication. However, spreading
digested sludge and digestate from anaerobic digestion of
food waste on agricultural land will also lead to eutrophication.
From this perspective, it is better to use the digestate as
fuel in waste incineration.
X. In a sensitive analysis regarding handling of anaerobic
digested sludge the result shows that the best treatment
method from an economic point of view is to spread the
sludge on agricultural land. As discussed above (in conclusion
IX), when considering eutrophication it is better to use
the sludge as fuel in waste incineration. The different
treatment options studied for sludge give equal results
concerning acidification and emissions of climate gases.