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Appendix C: Other Anthropogenic Sources of Methane
Pages 215-218

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From page 215...
... Globally, however, rice cultivation is responsible for approximately 10 percent of total emissions.1 Methane emissions from rice cultivation are the result of anaerobic decomposition of organic material (i.e., methanogensis) , which escapes to the atmosphere primarily by diffusive transport through the rice plants during the growing season, when soils are waterlogged.
From page 216...
... population is multiplied by factors indicating the amount of waste entering the system, the relative use of aerobic versus anaerobic treatment systems, and system-specific emission factors. In general, systematic accounting of degradable carbon to anaerobic pathways through the various process steps for individual treatment facilities is lacking, as is process-specific modeling for fugitive methane generation and emissions, leading to very high uncertainties regarding methane emissions from wastewater treatment.
From page 217...
... Complications include fossil carbon, which is unavailable to anaerobic microbial pathways (Tseng et al., 2016) , and/or sequestered carbon through wastewater treatment steps (Rosso and Stenstrom, 2008)

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