Waste water handling is a sub-sector in the waste sector. In the Danish emission inventory system CH₄ and N₂O emissions from waste waster handling are calculated.

N₂O contributes the most to the sectoral total, varying between contributions of 5.9 % (2006) and 8.5 % (1994). In 2009 the contribution is 6.0 %. CH₄ from this source contributes with between 4.7 % (1993) and 5.7 % (2004) of the sectoral total. In 2009 the contribution is 5.6 %. The CH₄ emissions increase steadily over the time-series, the emission in 2009 is 12.7 % higher than in 1990.

Figure 1   Time-series of emissions from waste water handling for the years 1990-2009