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Implementation of Biogas- production into the German agricultural emission inventory

Implementation of Biogas- production into the German agricultural emission inventory. Sebastian Wulf (KTBL), Hans-Dieter Haenel (TI). TFEIP – Agriculture and Nature Panel 13th May 2014, Ghent. Reasons for I mplementation. IPCC requirements for greenhouse gases :.

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Implementation of Biogas- production into the German agricultural emission inventory

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  1. Implementation of Biogas-productionintothe German agriculturalemissioninventory Sebastian Wulf (KTBL), Hans-Dieter Haenel (TI) TFEIP – Agricultureand Nature Panel 13th May 2014, Ghent

  2. ReasonsforImplementation • IPCC requirementsforgreenhousegases: • IPCC 2000 guidelines: anaerobicdigestionasmanagementoptionfordung and urine in liquid manure/slurry-systems • IPCC 2006 guidelines: norestrictiontoslurrysystems Submission 2013 (for 2011): Implementation of AD forslurryand solid manure (compliancewith IPCC 2006) • Digestatemanagement relevant sourceof NH3-emissions in Germany • Emissionsfromdigestates not accounted so far. (xx kt NH3) Submission 2015 (for 2013): Improvedmethodforslurry, solid manureandenergycrops. 1

  3. System boundariesforagriculturalinventory sewagetreatment gas capture landfills CHP electricity biowaste gas processing biomethane energycrops biogasproduction slurry, solid manure Flare digestatestorage / processing Agriculture application fertilizer Wastetreatment 2 Energy

  4. Calculationprocedure Requirement: Calculationofimpliedemissionfactorsforanimalcategories,includingmanuretreatmentby AD Category 1 Category 2 Category 3.. Energycrops X dig X dig X dig • Pre-storage • slurry: N-emissionsnegligible(short, covered) • solid manure: emissionsof NH3, N2O, NO andN2 Pre-storage - Negligible (low pH, captureofleachate) • Digestion process • No relevant N-emissions • N-transformation (Norg -> TAN) • Storage • emissionfactor(gas tightstorage / open tank withcrust) • Application • emissionfactors (different applicationtechniquesandincorporationtimes) 3

  5. Emissionsfromstorageofdigestates ENH3-N annual NH3-N emissions [kg a-1NH3-N] TANdigdaily amount of TAN in manure entering the digester [kg d-1] fTANshare of organic N entering the digester that is mineralized to TAN [kg kg-1] Norg, digamount of Norg contained in manure entering the digester [in kg d-1] αtime units conversion factor [365 d a-1] Xgtsshare (fraction) of gastight storage of digestion residues[kg kg-1] EFNH3-N NH3-N emission factor for the storage of digestates 4

  6. Emissionsfromapplicationofdigestates ENH3-N, annual NH3-N emissions [kg a-1 NH3-N] TANdig daily amount of TAN contained in manure entering the digester [in kg d-1] fTAN share of organic N entering the digester that is mineralized to TAN [kg kg-1] Norg, dig daily amount of organic N in manure entering the digester [in kg d-1] α time units conversion factor (365 d a-1) ENH3-N, dig annual NH3-N emissions from storage of digestion residues [kg a-1 NH3-N] EN*, dig, annual non-ammonia N emissions from storage of digestion residues [in kg a-1 N] EFNH3-N, dig, spreading, j NH3-N emission factor for spreading technique j [kg NH3-N per kg TAN] xspreading, j relative share of digested slurry spreaded with technique j 5

  7. Emission factorsandactivitydataused General assumptions: • Negligible NH3-emissions frompre-storageofslurryandenergycrops • NH3-emissions fromfermenterand gas-tightdigestatestorage = 0 Emission factoratpre-storage (only solid manure): • EFNH3-N, pre-storage= 0,1 x EFNH3-N, storage manure • EFN2O-N, pre-storage= 0,1 x EFN2O, storage manure • EFNO-N, pre-storage = 0,1 x EFNO, storage manure • EFN2-N, pre-storage = 0,1 x EFN2, storage manure EFstorage manure of respective solid manure from EMEP-Guidebook Assumption (nodataavailable) – maybediscussed N entering AD: • Xdig: canonlybedifferentiatedforcattle/pigs/poultry (basisfederalstate) For sub-categories (e.g. dairycows, calves, heifers, beefcattle) same Xdigis assumed 6

  8. Emission factorsandactivitydataused N transformation in fermenter (fTAN) • Slurries: Survey showed, thatmean TAN risesfrom 45% to 62% fTAN= 0.32 • Energycrops: mean TAN ofdigestatesfromenergycrops: 56 % ofNtot . fTAN= 0.56 Share ofcoveredstorage (Xgts) • Xgtsfor different plant sizesfromannual non-officialsurvey (DBFZ) • Plant sizedistributionfor different statessuppliedbyFederal Network Agency Xgtsvariesfor different federalstates 7

  9. Emission factorsandactivitydataused Emission factorsatstorage • EFNH3-N, storage: - as EF forstorageofundigestedslurrywithcrust- for gas-tightstorage EF = 0 • EFN2O, storage: gas-tight storage = 0, open storage = undigested slurry with crust • EFNO, storage = 0,1 x EFN2O, storage • EFN2, storage = 3 x EFN2O, storage asforstorageofundigestedslurry in German inventory Techniquesusedforapplication (xspreading) • Share of different applicationtechniquestakenfromofficialstatisticalsurvey (2010), specificfordigestates Emission factorforapplication • As nodataavailable, assumedtobethe same asforcattleslurryfortherespectiveapplicationtechniques

  10. Status andfutureneeds • Calculationproceduresarenowbeingimplementedin themodel • Sourcesandqualityofactivitydataneedtobereviewedespeciallyforshareofslurryandenergycropsentering AD (Xdig ) • Analogyofemissionfactorsfordigestatestorageandapplicationwithslurriesneedstobechecked Mightbenecessarytodevelopspecific EF fordigestates 8

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