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Waste Management & Research
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Characterization of humic substances in landfill leachate and impact on the hydraulic conductivity of geosynthetic clay liners

Young-Soo Han

Department of Civil and Environmental Engineering, The University of Michigan, Ann Arbor, Michigan, USA

Jai-Young Lee

Department of Environmental Engineering, University of Seoul, Seoul, Korea, Republic of Korea

Carol J. Miller

Department of Civil and Environmental Engineering, Wayne State University, Detroit, Michigan, USA, cmiller{at}eng.wayne.edu

Lance Franklin

Office of Environmental Health and Safety, Wayne State University, Detroit, Michigan, USA

A detailed characterization was performed on the humic substances present in landfill leachate derived from the older (10-year) and younger (6-month) municipal landfill cells at a site in Inchion, Korea. The characterization focused on the humic and fulvic acid components of the leachate, relying on information gleaned from the UV/visible spectroscopy, molecular weight distribution, and Fourier transform infrared spectroscopy. The effect of the leachates, and specific components of the leachates, on the hydraulic conductivity of a geosynthetic clay liner (GCL), was evaluated. The humic acid extracted from the older leachate was composed primarily of high molecular weight and aromatic compounds, which is typical for humic acids. However, the humic acid extracted from the younger leachate showed characteristics more similar with fulvic acids, indicating that the younger humic acid was at the initial stage of humification. The hydraulic conductivity of the GCLs to the humic and fulvic acids of the older and younger leachate was similar to those permeated with the distilled deionized water (DI). However, the hydraulic conductivity of the samples tested with the raw leachate was more than 200 times the DI value. This fact suggests that cations present in leachate, rather than humic substances, are the key factor in the increase of the permeability.

Key Words: Geosynthetic clay liners (GCLs) • hydraulic conductivity • leachate • humic substances • landfill • wmr 1255—5

This version was published on May 1, 2009

Waste Management & Research, Vol. 27, No. 3, 233-241 (2009)
DOI: 10.1177/0734242X08095230
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