Observations on the methane oxidation capacity of landfill soils

被引:66
|
作者
Chanton, Jeffrey [1 ]
Abichou, Tarek [2 ]
Langford, Claire [1 ]
Spokas, Kurt [3 ]
Hater, Gary [4 ]
Green, Roger [4 ]
Goldsmith, Doug [5 ]
Barlaz, Morton A. [6 ]
机构
[1] Florida State Univ, Dept Earth Ocean & Atmospher Sci, Tallahassee, FL 32306 USA
[2] FAMU FSU Coll Engn, Dept Civil & Environm Engn, Tallahassee, FL 32310 USA
[3] ARS, USDA, St Paul, MN USA
[4] Waste Management Inc, Cincinnati, OH 45211 USA
[5] Alternat Nat Technol Inc, Blacksburg, VA 24060 USA
[6] N Carolina State Univ, Dept Civil Construct & Environm Eng, Raleigh, NC 27695 USA
基金
美国国家科学基金会;
关键词
NONMETHANE ORGANIC-COMPOUNDS; BIOLOGICALLY-ACTIVE COVER; MASS-BALANCE; EMISSIONS; ATTENUATION; MITIGATION; TEMPERATURE; CONSUMPTION; GASES; MODEL;
D O I
10.1016/j.wasman.2010.08.028
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The objective of this study was to determine the role of CH4 loading to a landfill cover in the control of CH4 oxidation rate (g CH4 m(-2) d(-1)) and CH4 oxidation efficiency (% CH4 oxidation) in a field setting. Specifically, we wanted to assess how much CH4 a cover soil could handle. To achieve this objective we conducted synoptic measurements of landfill CH4 emission and CH4 oxidation in a single season at two Southeastern USA landfills. We hypothesized that percent oxidation would be greatest at sites of low CH4 emission and would decrease as CH4 emission rates increased. The trends in the experimental results were then compared to the predictions of two differing numerical models designed to simulate gas transport in landfill covers, one by modeling transport by diffusion only and the second allowing both advection and diffusion. In both field measurements and in modeling, we found that percent oxidation is a decreasing exponential function of the total CH4 flux rate (CH4 loading) into the cover. When CH4 is supplied, a cover's rate of CH4 uptake (g CH4 m(-2) d(-2)) is linear to a point, after which the system becomes saturated. Both field data and modeling results indicate that percent oxidation should not be considered as a constant value. Percent oxidation is a changing quantity and is a function of cover type, climatic conditions and CH4 loading to the bottom of the cover. The data indicate that an effective way to increase the % oxidation of a landfill cover is to limit the amount of CH4 delivered to it. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码:914 / 925
页数:12
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