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Pig slurry organic matter transformation and methanogenesis at ambient storage temperatures.
- Source :
-
Journal of environmental quality [J Environ Qual] 2023 Nov-Dec; Vol. 52 (6), pp. 1139-1151. Date of Electronic Publication: 2023 Sep 25. - Publication Year :
- 2023
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Abstract
- Manure management is a significant source of global methane emissions, and there is an increased interest in understanding and predicting emissions. The hydrolysis rate of manure organic matter is critical for understanding and predicting methane emissions. We estimated hydrolysis rate constants of crude protein, fibers, and lipids and used the Arrhenius equation to describe its dependency on temperature. Simultaneously, measurements of methane emission, <superscript>13/12</superscript> C isotope ratios, and methanogen community were conducted. This was achieved by incubating fresh pig manure without inoculum at 10°C, 15°C, 20°C, and 25°C for 85 days in a lab-scale setup. Hydrolysis of hemicellulose and cellulose increased more with temperature than crude protein, but still, hydrolysis rate of crude protein was highest at all temperatures. Results suggested that crude protein consisted of multiple substrate groups displaying large differences in degradability. Lipids and lignin were not hydrolyzed during incubations. Cumulative methane emissions were 7.13 ± 2.69, 24.6 ± 8.00, 66.7 ± 4.8, and 105.7 ± 7.14 g <subscript>CH4</subscript> kg <subscript>VS</subscript> <superscript>-1</superscript> at 10°C, 15°C, 20°C, and 25°C, respectively, and methanogenic community shifted from Methanosphaera toward Methanocorpusculum over time and more quickly at higher temperatures. This study provides important parameter estimates and dependencies on temperature, which is important in mechanistic methane emission models. Further work should focus on characterizing quickly degradable substrate pools in the manure organic matter as they might be the main carbon source of methane emission from manure management.<br /> (© 2023 The Authors. Journal of Environmental Quality published by Wiley Periodicals LLC on behalf of American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.)
- Subjects :
- Animals
Swine
Temperature
Methane metabolism
Lipids
Manure
Euryarchaeota metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 1537-2537
- Volume :
- 52
- Issue :
- 6
- Database :
- MEDLINE
- Journal :
- Journal of environmental quality
- Publication Type :
- Academic Journal
- Accession number :
- 37703095
- Full Text :
- https://doi.org/10.1002/jeq2.20512