3.I - Agricultural: Other

Last updated on 29 Aug 2019 09:29 (cf. Authors)

NFR-Code Name of Category Method AD EF Key Category 1 State of reporting
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) no key category

Country specifics

In 2017, NH3 emissions from category 3.I (agriculture other) derived up to 0.5 % from total agricultural emissions, which is equal to ~ 3.3 kt NH3. NOx emissions from category 3.I contribute 0.14 % (~ 0.18 kt) to the total agricultural emissions. All these emissions originate from the storage of digestate from energy crops (for details see Rösemann et al., 2019 [1]).
Note that these emissions of NH3 and NOx from storage of anaerobically digested energy crops are excluded from emission reporting by adjustment as they are not considered in the NEC and Gothenburg commitments (see adjustments).
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 KTBL (Kuratorium für Technik und Bauwesen in der Landwirtschaft / Association for Technology and Structures in Agriculture). 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

2019_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 frequencies 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 leaving the fermenter with the relative frequency of open tanks and the emission factor for open tank. The amount of N in the digestate leaving the fermenter is identical to the N amount in energy crops fed into anaerobic digestion (see Table 1) because N losses from pre-storage are negligible and there are no N losses from fermenter (see Rösemann et al., 2019, Chapter 10.2.1 [1].

Emission factors

As no specific emission factor is 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). This choice of emission factor is based on the fact that energy crops are, in general, co-fermented with animal manures (i. e. mostly slurry) and that a natural crust forms on the liquid digestates due to the relatively high dry matter content of the energy crops. 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. Table 2 shows the resulting implied emission factors for NH3-N and NO-N. NOx emissions are related to NO-N emissions by the ratio of 46/14. This relationship also holds for NO-N and NOx emission factors.

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

2019_3I_Table_2.PNG

Recalculations

The recalculation page of the IIR (https://iir-de.wikidot.com/recalculations) provides a brought overview of the recalculations of all source categories. More details about the agricultural recalculations can be found on the main agricultural page (https://iir-de.wikidot.com/3-agriculture). Further details about recalculations are described in Rösemann et al. (2019), Chapter 3.5.2.

Uncertainty

Details will be described in chapter 1.7.

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