3.I Agricultural: Other

Last updated on 20 Feb 2017 10:22 (cf. Authors)

NFR-Code Name of Category Method AD EF Key Source for (by)
3.I Agriculture other
consisting of / including source categories
3.I Storage of digestate from energy crops T2 (NH3, NOx) Q, PS CS (NH3, NOx)

Country specifics

In 2015, NH3 emissions from sector 3.I (agriculture other) derived up to 0.4 % from total agricultural emissions, which is equal to ~ 3.0 Gg NH3. NOx emissions from sector 3.I contribute 0.1 % (~ 0.2 Gg) to the total agricultural emissions. All these emissions originate from the storage of digestate from energy crops (for details see Rösemann et al., 2017, [1]).
Note that these emissions of NH3 and NOx are excluded from emission reporting by adjustment as they are not considered in the NEC and Gothenburg commitments.
The emissions resulting from the application of digestate of energy crops as organic fertilizer are dealt with under 3.D.a.2.c.

Activity Data

Time series of activity data have been provided by the Association for Technology and Structures in Agriculture (KTBL). From these data the amount of N in energy crops fed into anaerobic digestion was calculated.

Table 1: N amount in energy crops fed into anaerobic digestion

2017_3I_Table_1.PNG

Methodology

The calculation of emissions from storage of digestate from energy crops considers two different types of storage, i. e. gastight storage and open tank. The distributions of these storage types are also provided by KTBL. There are no emissions of NH3 and NO from gastight storage of digestate. Hence the total emissions from the storage of digestate are calculated by multiplying the amount of N in the digestate with the share of open tanks and the respective emission factor. The amount of N in the digestate is the amount given in Table 1 as there are no N emissions from the fermenter. For details see Rösemann et al. (2017) [1].

Emission factors

As there is no specific emission factor known for the storage of digestion residues in open tanks, the NH3 emission factor for storage of cattle slurry with crust in open tanks was adopted (0.045 kg NH3-N per kg TAN). The TAN content after the digestion process is 0.56 kg TAN per kg N. The NO emission factor for storage of digestion residues in open tanks was set to 0.0005 kg NO-N per kg N. For details see Rösemann et al. (2017) [1]. Table 2 shows the resulting implied emission factors for NH3-N and NO-N.

Table 2: IEF for NH3-N and NO-N emissions from storage of digested energy crops

2017_3I_Table_2.PNG
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