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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 quality class 2 systems that remove particles, but only 20% of NH<sub>3</sub> emissions.
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Certified systems include all pig places with air scrubbers recorded in the KTBL manufacturer survey that have a certificate for the removal of particulate matter and NH<sub>3</sub> issued by the [DLG](https://www.dlg.org/de/landwirtschaft/themen/tierhaltung/schwein/dlg-merkblatt-403). Quality class 2 includes all pig places with air scrubbers that were recorded by the LZ 2020, excluding systems already covered by the manufacturer survey. For air scrubbers of this quality class further assumptions on the NH<sub>3</sub> reduction efficiency are required, as it is assumed that non-DLG-certified systems are included in the LZ 2020 data (see [KTBL, 2022b). ](https://git-dmz.thuenen.de/vos/EmissionsAgriculture2023/-/wikis/9-Literature#ktbl-kuratorium-f%C3%BCr-technik-und-bauwesen-in-der-landwirtschaft-2022b)The reduction efficiency of an air scrubber depends on the type of system ([KTBL 2006c](https://git-dmz.thuenen.de/vos/EmissionsAgriculture2023/-/wikis/9-Literature#ktbl-2006c)). For quality class 2, their is no information on the specific types of systems. However, it is assumed that most of the systems of quality class 2 are not certified for the removal of NH<sub>3</sub> by the DLG. Following an expert judgement from Dr. J. Hahne, Thünen Institute of Agricultural Technology, an NH3 removal efficiency of 20% can be assumed for air scrubbers in the quality class 2 ([Hahne 2022](https://git-dmz.thuenen.de/vos/EmissionsAgriculture2023/-/wikis/9-Literature#hahne-j-2022)). This removal efficiency is 60 %-points below the value used for systems in the quality class 1, and is based on a rough estimate taking into account that no information on the type of systems or mode of operation is available.
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Certified systems include all pig places with air scrubbers recorded in the KTBL manufacturer survey that have a certificate for the removal of particulate matter and NH<sub>3</sub> issued by the [DLG](https://www.dlg.org/de/landwirtschaft/themen/tierhaltung/schwein/dlg-merkblatt-403). Quality class 2 includes all pig places with air scrubbers that were recorded by the LZ 2020, excluding systems already covered by the manufacturer survey. For air scrubbers of this quality class further assumptions on the NH<sub>3</sub> reduction efficiency are required, as it is assumed that non-DLG-certified systems are included in the LZ 2020 data (see [KTBL, 2022b). ](9-Literature#ktbl-kuratorium-f%C3%BCr-technik-und-bauwesen-in-der-landwirtschaft-2022b)The reduction efficiency of an air scrubber depends on the type of system ([KTBL 2006c](9-Literature#ktbl-2006c)). For quality class 2, their is no information on the specific types of systems. However, it is assumed that most of the systems of quality class 2 are not certified for the removal of NH<sub>3</sub> by the DLG. Following an expert judgement from Dr. J. Hahne, Thünen Institute of Agricultural Technology, an NH3 removal efficiency of 20% can be assumed for air scrubbers in the quality class 2 ([Hahne 2022](9-Literature#hahne-j-2022)). This removal efficiency is 60 %-points below the value used for systems in the quality class 1, and is based on a rough estimate taking into account that no information on the type of systems or mode of operation is available.
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According to the KTBL data, 6.6 % of all pig places were equipped with certified systems in 2021, another 11.2 % were equipped with quality class 2 systems. For poultry 0.8 % 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. |
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