Role of Geotechnical Properties in the Dynamic Aspects of Methane Migration in Biocovers

Parameswaran, TG and Sivakumar Babu, GL (2022) Role of Geotechnical Properties in the Dynamic Aspects of Methane Migration in Biocovers. In: Journal of Hazardous, Toxic, and Radioactive Waste, 26 (1).

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Abstract

Controlling methane emissions from landfills has been a significant concern over the last decades. Researchers have identified the use of landfill cover with oxidative capacity (biocover) as a promising solution to mitigate these methane emissions. However, the geotechnical conditions in a biocover can affect the methane fluxes and the pressure buildup inside landfills. In this paper, the effect of the porosity, degree of saturation, and absolute permeability of the biocovers on the atmospheric methane flux and pressure buildup inside landfills is studied. Numerical modeling with TOUGH3 EOS7CA was carried out to assess the methane migration (one dimensional) and methane oxidation in biocovers. Simulations revealed the role of geotechnical properties in controlling the dynamic outflow of methane and inflow of oxygen in the biocover. The relations between methane migration and pressure development are also established, and the effect of geotechnical properties in these aspects is quantified. The importance of coupling these factors for improving the efficiency of a biocover is highlighted. An absolute permeability in the order of 10-13 m2 and a degree of saturation less than 0.5 is suggested for achieving optimal performance. The role of atmospheric pressure and temperature on the atmospheric methane emissions is also described. © 2021 American Society of Civil Engineers.

Item Type:	Journal Article
Publication:	Journal of Hazardous, Toxic, and Radioactive Waste
Publisher:	American Society of Civil Engineers (ASCE)
Additional Information:	The copyright for this article belongs to American Society of Civil Engineers (ASCE)
Keywords:	Atmospheric chemistry; Atmospheric pressure; Geotechnical engineering; Land fill; Pressure effects; Soil mechanics; Supersaturation, Absolute permeability; Atmospheric methane flux; Atmospheric methanes; Biocover; Degree of saturations; Geotechnical properties; Methane emissions; Methane fluxes; Methane oxidation; Pressure build up, Methane
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	22 Nov 2021 11:34
Last Modified:	22 Nov 2021 11:34
URI:	http://eprints.iisc.ac.in/id/eprint/70527

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