3.1.3. Net GHG emissions
The overall climate impact or benefit of ISWM system will
depend on net GHG emissions. In order to calculate the net impact
from each treatment method, GHG savings potential was subtracted
from the life cycle GHG emissions. As shown in Fig. 3,
negative values (GHG savings) have resulted as the net impacts
from recycling, anaerobic digestion, composting and use of organic
waste as animal feed.
Net GHG emissions from ISWM system were calculated by
subtracting GHG saving potential due resource recovery (385.58 kg
CO2-eq/tonne of MSW collected) from GHG emissions from the
entire system (672.76 kg CO2-eq/tonne of MSW collected). Net GHG
emissions potential from the current ISWM system is 287.19 kg
CO2-eq/tonne of MSW collected. The estimated net GHG emissions
from the integrated system showpotential GHG emissions (positive
value), particularly because of the high share of methane emissions
from landfilling (70%) of organic waste.