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A steady-state analytical profile method for determining methane oxidation in landfill cover
S Feng1, H W Liu2, A C F Chiu3
1College of Civil Engineering, Fuzhou University, Fuzhou City, Fujian Province, China; Department of Civil and Environmental Engineering, Hong Kong University of Science and Technology, Hong Kong, China.
The Science of the Total Environment
|September 22, 2018
Summary
A new method quantifies methane oxidation in soil, providing detailed insights into efficiency, gas transfer, and reaction rates. This approach overcomes limitations of existing methods for comprehensive analysis.
Area of Science:
- Environmental Science
- Geochemistry
- Microbiology
Background:
- Microbial aerobic methane oxidation is crucial in landfill cover systems.
- Existing methods for analyzing methane oxidation yield limited, qualitative data.
- Accurate quantification of methane oxidation processes is essential for environmental management.
Purpose of the Study:
- To develop a novel, quantitative method for assessing methane oxidation in soil.
- To comprehensively determine methane oxidation efficiency, stoichiometry, and gas transfer mechanisms.
- To establish distributions of methane generation and gas reaction rates.
Main Methods:
- Governing equations based on mass balance for O2, CO2, CH4, and N2 under steady-state conditions.
- Incorporation of gas diffusion (Fick's law), advection, and reaction.
- Utilizing gas concentration profiles to derive diffusion, advection, and reaction parameters.
Main Results:
- The new method successfully quantifies methane oxidation efficiency and stoichiometry.
- It determines gas transfer mechanisms, including diffusion and advection.
- Distributions of methane generation and gas reaction rates for CH4, CO2, and O2 are established.
Conclusions:
- The developed method offers a quantitative and comprehensive approach to studying methane oxidation in soil.
- It overcomes the limitations of qualitative analyses from existing methods.
- This technique provides valuable data for understanding and managing methane cycling in terrestrial environments.
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