Effectiveness of compacted soil liner as a gas barrier layer in the landfill final cover system

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Moon, Seheum; Nam, Kyoungphile; Kim, Jae Young; Chung, Moonkyung; Shim, Kyu Hwan
Issue Date
Waste Management 28 (10), 1909-1914
A compacted soil liner (CSL) has been widely used as a single barrier layer or a part of composite barrier layer in the landfill final
cover system to prevent water infiltration into solid wastes for its acceptable hydraulic permeability. This study was conducted to test whether the CSL was also effective in prohibiting landfill gas emissions. For this purpose, three different compaction methods (i.e., reduced, standard, and modified Proctor methods) were used to prepare the soil specimens, with nitrogen as gas, and with water and heptane as liquid permeants. Measured gas permeability ranged from 2.03×10-10 to 4.96×10-9 cm2, which was a magnitude of two or three orders greater than hydraulic permeability (9.60×10-13 to 1.05×10-11 cm2). The difference between gas and hydraulic permeabilities can be explained by gas slippage, which makes gas more permeable, and by soil–water interaction, which impedes water flow and
then makes water less permeable. This explanation was also supported by the result that a liquid permeability measured with heptane as a non-polar liquid was similar to the intrinsic gas permeability. The data demonstrate that hydraulic requirement for the CSL is not enough to control the gas emissions from a landfill.
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Civil & Environmental Engineering (건설환경공학부)Journal Papers (저널논문_건설환경공학부)
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