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| DOI: | 10.2134/jeq2007.0250 |
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| Web URL(s): | https://dl.sciencesocieties.org/publications/jeq/articles/37/2/459
Last checked: 11/07/2016
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https://dl.sciencesocieties.org/publications/jeq/pdfs/37/2/459
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| Publication Type:
| Refereed |
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| Author(s): | Molins, S.;
Mayer, K. U.;
Scheutz, C.;
Kjeldsen, P. |
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| Author Affiliation: | Molins and Mayer: Department of Earth and Ocean Sciences, University of British Columbia, Vancouver, British Columbia, Canada; Scheutz and Kjeldsen: Department of Environment & Resources, Tecnical University of Denmark, Lyngby, Denmark |
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| Title: | Transport and reaction processes affecting the attenuation of landfill gas in cover soils |
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| Column Name: | Technical reports: Vadose zone processes and chemical transport
Other records with the "Technical reports: Vadose zone processes and chemical transport" Column
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| Source: | Journal of Environmental Quality. Vol. 37, No. 2, March/April 2008, p. 459-468. |
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| Publishing Information: | Madison, Wisconsin: American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America |
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| # of Pages: | 10 |
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| Keywords: | TIC Keywords: Gases; Landfills; Oxygen; Methane gas; Oxidation; Soils
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| Abstract/Contents: | "Methane and trace organic gases produced in landfill waste are partly oxidized in the top 40 cm of landfill cover soils under aerobic conditions. The balance between the oxidation of landfill gases and the ingress of atmospheric oxygen into the soil cover determines the attenuation of emissions of methane, chlorofluorocarbons, and hydrochlorofluorocarbons to the atmosphere. This study was conducted to investigate the effect of oxidation reactions on the overall gas transport regime and to evaluate the contributions of various gas transport processes on methane attenuation in landfill cover soils. For this purpose, a reactive transport model that includes advection and the Dusty Gas Model for simulation of multicomponent gas diffusion was used. The simulations are constrained by data from a series of counter-gradient laboratory experiments. Diffusion typically accounts for over 99% of methane emission to the atmosphere. Oxygen supply into the soil column is driven exclusively by diffusion, whereas advection outward offsets part of the diffusive contribution. In the reaction zone, methane consumption reduces the pressure gradient, further decreasing the significance of advection near the top of the column. Simulations suggest that production of water or accumulation of exopolymeric substances due to microbially mediated methane oxidation can significantly reduce diffusive fluxes. Assuming a constant rate of methane production within a landfill, reduction of the diffusive transport properties, primarily due to exopolymeric substance production, may result in reduced methane attenuation due to limited O2ingress." |
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| Language: | English |
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| References: | 34 |
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| Note: | Figures
Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Molins, S., K. U. Mayer, C. Scheutz, and P. Kjeldsen. 2008. Transport and reaction processes affecting the attenuation of landfill gas in cover soils. J. Environ. Qual. 37(2):p. 459-468. |
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| DOI: 10.2134/jeq2007.0250 |
| Web URL(s):
https://dl.sciencesocieties.org/publications/jeq/articles/37/2/459
Last checked: 11/07/2016
Access conditions: Item is within a limited-access website
https://dl.sciencesocieties.org/publications/jeq/pdfs/37/2/459
Last checked: 11/08/2016
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
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MSU catalog number: b2225072a |
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