Role of Cover Systems to Control Methane Migration from Dumpsites

Parameswaran, TG and Shabina, B and Sivakumar Babu, GL (2020) Role of Cover Systems to Control Methane Migration from Dumpsites. In: Journal of Hazardous, Toxic, and Radioactive Waste, 24 (4).

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Abstract

The emission of landfill gases from dump sites due to anaerobic biodegradation of waste is a matter of increasing public concern as they significantly contribute to global warming. In order to assess the methane emissions from dump sites and to quantify the effects of clay covers and geosynthetic clay liners (GCLs) in reducing them, numerical simulations were conducted. From the simulations, it was noted that clay covers reduced the atmospheric methane flux fourfold and GCLs produced a sixfold reduction in comparison to open dumps. Atmospheric methane fluxes far above the safe limit were observed for the open dumps, which were significantly lower when covers were in place. Development of large pressures owing to reduced migration and continuous methane production were also observed when covers were present. A study of the effect of geotechnical properties of cover and material types suggested that they affect methane emissions significantly. Absolute permeability, porosity, saturation, and van Genuchten properties influenced methane migration to a large extent and hence should be taken into consideration in a cover design.

Item Type:	Journal Article
Publication:	Journal of Hazardous, Toxic, and Radioactive Waste
Publisher:	American Society of Civil Engineers (ASCE)
Additional Information:	The copyright of this article belongs to American Society of Civil Engineers (ASCE)
Keywords:	Atmospheric chemistry; Biodegradation; Global warming, Absolute permeability; Anaerobic biodegradation; Atmospheric methanes; Geosynthetic clay liners; Geotechnical properties; Methane emissions; Methane production; Public concern, Methane, advection; anoxic conditions; atmospheric pollution; clay liner; computer simulation; emission control; gas production; geosynthetics; landfill; landfill capping; methane; numerical model; waste facility
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	23 Sep 2020 07:28
Last Modified:	23 Sep 2020 07:28
URI:	http://eprints.iisc.ac.in/id/eprint/66598

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