Navigation Links
Landfill cover soil methane oxidation underestimated
Date:4/27/2009

MADISON, WI, APRIL 27, 2009 Landfilled waste decomposes in the absence of oxygen and results in the production of methane. 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.

Microbial methane oxidation reduces the emissions of methane and other volatile hydrocarbons from landfills. Determining the importance of this process is one of the major uncertainties in estimating national or global CH4 emissions from landfills. Landfill gas that is not collected passes through landfill cover soils on the way to being released to the environment. Bacteria in the soil consume methane and other volatile hydrocarbons that are produced by decomposition in the underlying waste by reacting it with oxygen.

A value of 0 to 10% oxidation has been recommended by the Intergovernmental Panel on Climate Change guidelines for national greenhouse gas inventories. Currently, for regulatory purposes the USEPA has recommended a default value for landfill cover CH4 oxidation of 10% due to the uncertainty involved and the lack of a standard method to determine oxidation rate.

Drs. Jeffrey Chanton, David Powelson, and Roger Green of Florida State University and Waste Management Inc. reviewed and compiled literature results from 42 determinations of the fraction of methane oxidized and 30 determinations of methane oxidation rate in a variety of soil types and landfill covers. The results were published in the March-April issue of the Journal of Environmental Quality. The means for the fraction of methane oxidized upon transit across the differing types of soil covers ranged from 22% in clayey soil to 55% in sandy soil. The overall mean fraction oxidized across all studies was 36% with a standard error of 6%. For a subset of fifteen studies conducted over an annual cycle the fraction of methane oxidized ranged from 11 to 89% with a mean value of 35 6%, a value that was nearly identical to the overall mean.

The literature summarized in this paper indicates that the fraction of methane oxidized in landfill cover soils is considerably greater than the default value of 10%. Of the 42 determinations of methane oxidation only four reported values of 10% or less. One reported a value of 10%. This particular study was the first to report a well constrained value for the fraction of methane oxidized in a specific landfill, and because of this, it has received undue weight in the determination of regulations. The default value of 10% should be updated based upon technological advancements in soil engineering and state-of-the-practice applications in cover design as well as recent studies detailed journals such as Journal of Environmental Quality.


'/>"/>

Contact: Sara Uttech
suttech@agronomy.org
608-268-4948
American Society of Agronomy
Source:Eurekalert

Related biology news :

1. UNH becomes first university in nation to use landfill gas as primary energy source
2. Researchers discover that gene switches on during development of epilepsy
3. Newly discovered epidermal growth factor receptor active in human pancreatic cancers
4. TGen researchers discover possible way to block the spread of deadly brain tumors
5. Yale researchers uncover secrets of salmonellas stealth attack
6. Penn biologists discover how silent mutations influence protein production
7. Field stations foster serendipitous discoveries in environmental, biological sciences
8. UC and partners awarded $23 million to transform discoveries into real-world health solutions
9. Penn researchers demonstrate a new model for drug discovery with a fluorescent anesthetic
10. Researchers discover primer to plant defense system
11. Gene discovery could lead to male contraceptive
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:1/21/2017)... Research and Markets has announced the addition of the ... ... voice recognition biometrics market to grow at a CAGR of 19.36% ... present scenario and the growth prospects of the global voice recognition ... considers the revenue generated from the sales of voice recognition biometrics ...
(Date:1/19/2017)... , Jan. 19, 2017 ... user experience and security for consumer electronics, and ... payment processing systems and cybersecurity solutions, today announced ... enterprises and financial institutions worldwide to bolster security ... the end-to-end secure user authentication platforms they offer, ...
(Date:1/18/2017)... Minn. , Jan. 18, 2017 ... technology company that supports the entire spectrum of ... has been another record-breaking year for the organization ... market interest in MedNet,s eClinical products and services. ... the tremendous marketplace success of iMedNet ...
Breaking Biology News(10 mins):
(Date:2/16/2017)... PHOENIX and NEW YORK ... announced the near completion of their $7M Series B ... on top of the $3.5M led by Mesa Verde ... of 2016.  These resources will be directed towards further ... Test, PCDx, a comprehensive genomic profiling test and expanding ...
(Date:2/15/2017)... ... February 15, 2017 , ... Executive search firm, ... Officer with GenePeeks. Matt is a veteran life sciences and molecular diagnostics ... company focused on identifying inherited disease risk in future generations. In his new ...
(Date:2/15/2017)... FRANCISCO , 15. Februar 2017  Trianni, ... Janssen Biotech, Inc. (Janssen) eine Lizenzvereinbarung über die ... ihrer Klasse führenden Plattform für die Entdeckung monoklonaler ... durch ihr neuartiges chimäres Gensegmentdesign aus, das ... an humanen Antikörpern bietet und das für die ...
(Date:2/15/2017)... 15, 2017  Vanda Pharmaceuticals Inc. (Vanda) (NASDAQ: ... the fourth quarter and full year ended December ... year for Vanda as we continued to demonstrate ... long-term exclusivity for Fanapt," said Mihael H. Polymeropoulos, ... emerging pipeline with important 2017 milestones underscores Vanda,s ...
Breaking Biology Technology: