Effect of Soil Solids Concentration and Temperature in Batch Tests on the Adsorption of Cr(VI) onto Clay Landfill Liners   Hai-jun Lu Institute of Porous Mechanics, Wuhan Polytechnic University, Wuhan, 430023, China email: luhaijun111@163.com Mao-tian Luan Institute of Geotechnical Engineering, School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian, 116024, China Jin-li Zhang Institute of Geotechnical Engineering, School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian, 116024, China
			ABSTRACT

The effect of soil solids concentration and temperature in batch tests on the adsorption of Cr(VI) onto landfill liner-soil materials was investigated. The results of the study show that the soils specimen sorption to Cr(VI) is characterized by a Langmuir isotherm model. The values of the isotherm parameters (qm, b) and soil solids concentrations have a log-log linear relationship at low soil solids concentrations. The values of measured the isotherm parameters decreased strongly as soil solids concentration increased, and finally stabilized when the soil solids concentrations were over the critical values. The values of measured isotherm parameters (qm, b) increased linearly with increasing temperature. It was concluded that the values for isotherm parameters measured using batch tests under low soil solids concentration will not properly simulate the field situation, and retardation factors of clay landfill liners systems will be overestimated. Temperature of landfill has obvious influence on the transport of pollutants through clay landfill liners.

Keywords: Landfill; Pollutants; Adsorption; Clay; liner; Temperature

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