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A field trial of nutrient stimulation of methanotrophs to reduce greenhouse gas emissions from landfill cover soils
| Content Provider | Scilit |
|---|---|
| Author | Lizik, William Im, Jeongdae Semrau, Jeremy D. Barcelona, Michael J. |
| Copyright Year | 2012 |
| Abstract | Landfills are among the major sources of anthropogenic methane $(CH_{4}$) estimated to reach 40 × $10^{9}$kg per year worldwide by 2015 ( IPCC, 2007 IPCC. 2007. Intergovernmental Panel on Climate Change, Synthesis Report on Contributions of Work Groups 1, 2, and 3 to the Fourth Assessment Report Core Writing Team, Edited by: Pauchar, R.K. and Reisinger, A. Geneva, Switzerland : IPCC. [Google Scholar] ). A 2½-year field experiment was conducted at a closed landfill in western Michigan where methanotrophs, methane-consuming bacteria, were stimulated by nutrient addition to the soil without significantly increasing biogenic nitrous oxide $(N_{2}$O) production. The effects of the nitrogen amendments $(KNO_{3}$ and $NH_{4}$Cl), phenylacetylene (a selective inhibitor of nitrifying bacteria that contribute to $N_{2}$O production), and a canopy (to reduce direct water infiltration) on the vertical soil gas profiles of $CH_{4}$, $CO_{2}$, and $O_{2}$ were measured in the top meter of the soil. Methane and nitrous oxide fluxes were calculated from the corresponding soil gas concentration gradients with respect to depth and a Millington–Quirk diffusivity coefficient in soil derived empirically from soil porosity, water content, and diffusivity coefficients in air from the literature. Methane flux estimates were as high as 218.4 g $m^{−2}$ $day^{−1}$ in the fall and 12.8 $g/m^{−2}$ $day^{−1}$ in the summer. During the spring and summer, $CH_{4}$ fluxes were reduced by more than half by adding $KNO_{3}$ and $NH_{4}$Cl into the soil as compared to control plots, while $N_{2}$O fluxes increased substantially. The concurrent addition of phenylacetylene to the amendment decreased peak $N_{2}$O production by half and the rate of peak methane oxidation by about one-third. The seasonal average methane and $N_{2}$O flux data were extrapolated to estimate the reduction of $CH_{4}$ and $N_{2}$O fluxes into the atmosphere by nitrogen and inhibitor addition to the cover soils. The results suggest that such additions coupled with soil moisture management may provide a potential strategy to significantly reduce greenhouse gas emissions from landfills. Supplemental Materials: Supplemental materials are available for this paper. Go to the publisher's online edition of the Journal of the Air & Waste Management Association. |
| Related Links | http://www.tandfonline.com/doi/pdf/10.1080/10962247.2012.755137?needAccess=true |
| Ending Page | 309 |
| Page Count | 10 |
| Starting Page | 300 |
| ISSN | 10962247 |
| e-ISSN | 21622906 |
| DOI | 10.1080/10962247.2012.755137 |
| Journal | Journal of the Air & Waste Management Association |
| Issue Number | 3 |
| Volume Number | 63 |
| Language | English |
| Publisher | Informa UK Limited |
| Publisher Date | 2012-09-13 |
| Access Restriction | Open |
| Subject Keyword | Soil Science Nitrogen Greenhouse Gas Emissions Methane Cover Soils Emissions From Landfills Reduce Greenhouse Gas |
| Content Type | Text |
| Resource Type | Article |
| Subject | Atmospheric Science Pollution Waste Management and Disposal Management, Monitoring, Policy and Law |
