meta data for this page
  •  

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revisionPrevious revision
Next revisionBoth sides next revision
sector:agriculture:manure_management:start [2022/12/14 15:03] – [Table] doeringsector:agriculture:manure_management:start [2022/12/14 15:12] – doering
Line 140: Line 140:
  
 The model allows tracing of the pathways of the two N fractions after excretion. The various locations where excretion may take place are considered. The partial mass flows down to the input to soil are represented.  The model allows tracing of the pathways of the two N fractions after excretion. The various locations where excretion may take place are considered. The partial mass flows down to the input to soil are represented. 
-During storage Norg can be transformed into TAN and vice versa. Both, the way and the magnitude of such transformations may be influenced by manure treatment processes like, e. g., anaerobic digestion where a considerable fraction of Norg is mineralized to TAN. For details see Vos et al. (2022), Chapters 3.3.4.3 and 3.3.4.4. Wherever NH<sub>3</sub> is emitted, its formation is related to the amount of the TAN present. N<sub>2</sub>O emissions are related to the total amount of N available (Norg + TAN). NO<sub>x</sub> emissions (i. e. NO emissions) are calculated proportionally to the N<sub>2</sub>O emissions, see section 'Emission factors'. Note that the N<sub>2</sub>O, NO<sub>x</sub> and N2 emissions from the various storage systems include the respective emissions from the related housing systems.+During storage Norg can be transformed into TAN and vice versa. Both, the way and the magnitude of such transformations may be influenced by manure treatment processes like, e. g., anaerobic digestion where a considerable fraction of Norg is mineralized to TAN. For details see Rösemann et al. (2023), Chapter 4.2. Wherever NH<sub>3</sub> is emitted, its formation is related to the amount of the TAN present. N<sub>2</sub>O emissions are related to the total amount of N available (Norg + TAN). NO<sub>x</sub> emissions (i. e. NO emissions) are calculated proportionally to the N<sub>2</sub>O emissions, see section 'Emission factors'. Note that the N<sub>2</sub>O, NO<sub>x</sub> and N2 emissions from the various storage systems include the respective emissions from the related housing systems.
  
 == Air scrubber systems in swine and poultry housings == == Air scrubber systems in swine and poultry housings ==
-For pig and poultry production the inventory model considers the effect of air scrubbing. Data on frequencies of air scrubbing facilities and the removal efficiency are provided by KTBL (Kuratorium für Technik und Bauwesen in der Landwirtschaft / Association for Technology and Structures in Agriculture). The average removal efficiency of NH<sub>3</sub> is 80 % for swine and 70 % for poultry, while for TSP and PM<sub>10</sub> the rates are set to 90 % and for PM<sub>2.5</sub> to 70 % for both animal categories. For swine two types of air scrubbers are distinguished: certified systems that remove both NH<sub>3</sub> and particles, and non-certified systems that remove only particles.+For pig and poultry production the inventory model considers the effect of air scrubbing. Data on frequencies of air scrubbing facilities and the removal efficiency are provided by KTBL (Kuratorium für Technik und Bauwesen in der Landwirtschaft / Association for Technology and Structures in Agriculture) supplemented by data from the 2020 agricultural census. The average removal efficiency of NH<sub>3</sub> is 80 % for swine and 70 % for poultry, while for TSP and PM<sub>10</sub> the rates are set to 90 % and for PM<sub>2.5</sub> to 70 % for both animal categories. For swine two types of air scrubbers are distinguished: systems of “first class” that remove both NH<sub>3</sub> and particles, and ”second class” systems that remove only particles reliably and have a NH<sub>3</sub> removal efficiency of 20%.
  
-According to the KTBL data, 7.5 % of all pig places were equipped with certified systems in 2020, another 0.7 % were equipped with non-certified systems. For poultry 0.6 % of all laying hen places and 1.8 % of all broiler places were equipped with air scrubbers that remove both NH<sub>3</sub> and particles. +According to the KTBL data, 6.6 % of all pig places were equipped with ”first class” systems  in 2021, another 11.2 % were equipped with "second class" systems. For poultry 8 % of all laying hen places and 2.1 % of all broiler places were equipped with air scrubbers that remove both NH<sub>3</sub> and particles. 
-The amounts of NH<sub>3</sub>-N removed by air scrubbing are completely added to the pools of total N and TAN for landspreading. For details see Vos et al. (2022), Chapter 3.3.4.3.3.+The amounts of NH<sub>3</sub>-N removed by air scrubbing are completely added to the pools of total N and TAN for landspreading. For details see Rösemann et al. (2023), Chapter 4.2.2.
  
 == Anaerobic digestion of manure == == Anaerobic digestion of manure ==