Simple Management Changes Drastically Reduce Pig House Methane Emission in Combined Experimental and Modeling Study

Frederik Rask Dalby; Michael Jørgen Hansen; Lise Bonne Guldberg; Sasha Daniel Hafner; Anders Feilberg

doi:10.1021/acs.est.2c08891

Simple Management Changes Drastically Reduce Pig House Methane Emission in Combined Experimental and Modeling Study

Frederik Rask Dalby^*, Michael Jørgen Hansen, Lise Bonne Guldberg, Sasha Daniel Hafner, Anders Feilberg

^*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

1 Citation (Scopus)

Abstract

Reducing methane from livestock slurry is one of the quickest ways to counteract global warming. A straightforward strategy is to reduce slurry retention time inside pig houses by frequent transfer to outside storages, where temperature and therefore microbial activity are lower. We demonstrate three frequent slurry removal strategies in pig houses in a year-round continuous measurement campaign. Slurry funnels, slurry trays, and weekly flushing reduced slurry methane emission by 89, 81, and 53%, respectively. Slurry funnels and slurry trays reduced ammonia emission by 25-30%. An extended version of the anaerobic biodegradation model (ABM) was fitted and validated using barn measurements. It was then applied for predicting storage emission and shows that there is a risk of negating barn methane reductions due to increased emission from outside storage. Therefore, we recommend combining the removal strategies with anaerobic digestion pre-storage or storage mitigation technologies such as slurry acidification. However, even without storage mitigation technologies, predicted net methane reduction from pig houses and following outside storage was at least 30% for all slurry removal strategies.

Original language	English
Journal	Environmental Science and Technology
Volume	57
Issue	9
Pages (from-to)	3990-4002
Number of pages	13
ISSN	0013-936X
DOIs	https://doi.org/10.1021/acs.est.2c08891
Publication status	Published - Mar 2023

Keywords

emission
management
methane
modeling
pigs
slurry

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title = "Simple Management Changes Drastically Reduce Pig House Methane Emission in Combined Experimental and Modeling Study",

abstract = "Reducing methane from livestock slurry is one of the quickest ways to counteract global warming. A straightforward strategy is to reduce slurry retention time inside pig houses by frequent transfer to outside storages, where temperature and therefore microbial activity are lower. We demonstrate three frequent slurry removal strategies in pig houses in a year-round continuous measurement campaign. Slurry funnels, slurry trays, and weekly flushing reduced slurry methane emission by 89, 81, and 53%, respectively. Slurry funnels and slurry trays reduced ammonia emission by 25-30%. An extended version of the anaerobic biodegradation model (ABM) was fitted and validated using barn measurements. It was then applied for predicting storage emission and shows that there is a risk of negating barn methane reductions due to increased emission from outside storage. Therefore, we recommend combining the removal strategies with anaerobic digestion pre-storage or storage mitigation technologies such as slurry acidification. However, even without storage mitigation technologies, predicted net methane reduction from pig houses and following outside storage was at least 30% for all slurry removal strategies.",

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author = "Dalby, {Frederik Rask} and Hansen, {Michael J{\o}rgen} and Guldberg, {Lise Bonne} and Hafner, {Sasha Daniel} and Anders Feilberg",

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year = "2023",

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doi = "10.1021/acs.est.2c08891",

language = "English",

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Simple Management Changes Drastically Reduce Pig House Methane Emission in Combined Experimental and Modeling Study. / Dalby, Frederik Rask ; Hansen, Michael Jørgen ; Guldberg, Lise Bonne et al.
In: Environmental Science and Technology, Vol. 57, No. 9, 03.2023, p. 3990-4002.

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

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AU - Hansen, Michael Jørgen

AU - Guldberg, Lise Bonne

AU - Hafner, Sasha Daniel

AU - Feilberg, Anders

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N2 - Reducing methane from livestock slurry is one of the quickest ways to counteract global warming. A straightforward strategy is to reduce slurry retention time inside pig houses by frequent transfer to outside storages, where temperature and therefore microbial activity are lower. We demonstrate three frequent slurry removal strategies in pig houses in a year-round continuous measurement campaign. Slurry funnels, slurry trays, and weekly flushing reduced slurry methane emission by 89, 81, and 53%, respectively. Slurry funnels and slurry trays reduced ammonia emission by 25-30%. An extended version of the anaerobic biodegradation model (ABM) was fitted and validated using barn measurements. It was then applied for predicting storage emission and shows that there is a risk of negating barn methane reductions due to increased emission from outside storage. Therefore, we recommend combining the removal strategies with anaerobic digestion pre-storage or storage mitigation technologies such as slurry acidification. However, even without storage mitigation technologies, predicted net methane reduction from pig houses and following outside storage was at least 30% for all slurry removal strategies.

AB - Reducing methane from livestock slurry is one of the quickest ways to counteract global warming. A straightforward strategy is to reduce slurry retention time inside pig houses by frequent transfer to outside storages, where temperature and therefore microbial activity are lower. We demonstrate three frequent slurry removal strategies in pig houses in a year-round continuous measurement campaign. Slurry funnels, slurry trays, and weekly flushing reduced slurry methane emission by 89, 81, and 53%, respectively. Slurry funnels and slurry trays reduced ammonia emission by 25-30%. An extended version of the anaerobic biodegradation model (ABM) was fitted and validated using barn measurements. It was then applied for predicting storage emission and shows that there is a risk of negating barn methane reductions due to increased emission from outside storage. Therefore, we recommend combining the removal strategies with anaerobic digestion pre-storage or storage mitigation technologies such as slurry acidification. However, even without storage mitigation technologies, predicted net methane reduction from pig houses and following outside storage was at least 30% for all slurry removal strategies.

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Simple Management Changes Drastically Reduce Pig House Methane Emission in Combined Experimental and Modeling Study

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