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

tion, technical upgrades of the WWTPs (with the goal of reducing the effluent loads of nutrient
according to the Water Environment Action Plan) which was launched by the Danish parliament
(cf. Annex 3E) may result in an increased emission from anaerobic treatment processes. Based on
the above figures, on average 50% of the methane potential are combusted through out the period
1990-2003. The decrease in the internal combustion is accompanied by a parallel increase in the
external combustion and combustion processes included in the production and reuse of sludge in
sandblasting products.
The emission of N 2 O by wastewater handling is calculated as a sum of contributions from wastewater
treatment processes at the WWTPs and from sewage effluents. Emissions from effluent
wastewater are derived from registered activity data of effluent wastewater nitrogen loads from
point sources as given in Table 8.13, which includes a summary of the results of the N 2 O estimation.
Table 8.13. N 2 O emission from: effluents from point sources, wastewater treatment processes and in total
[tonnes].
Year
1990 0 0 0 0 265 265 17 283
1991 0 14 0 0 237 252 17 269
1992 0 14 0 0 205 219 17 237
1993 40 16 20 27 170 273 20 293
1994 43 19 19 26 161 268 29 297
1995 39 14 18 27 140 238 37 275
1996 27 10 18 24 100 180 44 224
1997 28 13 18 23 76 158 52 210
1998 22 15 16 20 81 154 59 213
1999 14 15 15 22 81 147 53 200
2000 14 12 15 43 73 157 54 211
2001 13 12 16 28 66 134 50 185
2002 12 16 15 23 71 137 50 188
2003 8 11 15 18 57 109 52 161
Note 1: For 1990-2002 the data corresponds with exception of rounding to data in the CRF submitted. For 2003 the N 2 Oemission
in CRF is 0.20 Gg (=196 tonnes). The reason for this minor discrepancy is that the CRF had to be finalised on
data, which for 2003 was preliminary. Correction will be made in next CRF submission.
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