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Posted Tue Apr 28 2009: from American Society of Agronomy, via EurekAlert:
Landfill cover soil methane oxidation underestimated
Landfills are classified as the second-largest human-made source of CH4 in the U.S. Additionally, landfill gas contains numerous non-methane hydrocarbons that are either volatilized directly from waste materials or produced through biochemical reactions during waste degradation.... A value of 0 to 10 percent oxidation has been recommended.... The overall mean fraction oxidized across all studies was 36 percent with a standard error of 6 percent. For a subset of fifteen studies conducted over an annual cycle the fraction of methane oxidized ranged from 11 to 89 percent with a mean value of 35 [plus or minus] 6 percent, a value that was nearly identical to the overall mean.
[Read more stories about: methane release]

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'Doc Jim says:
The mean of the means means that landfills are producing three times the recommended maximum. I mean it.

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