Abstract
This study investigates the response of leachate percolation in sand-bentonite and zeolite-bentonite mixtures for use of a liner. For this purpose, leachate sample was collected from Manisa Uzunburun landfill site, and flexible wall hydraulic conductivity tests were performed on these binary mixtures. During the study, the characterization of the leachate was done, pH and electrical conductivity values were measured, and chemical change in inlet and outlet samples was determined for varying pore volumes of flow. The hydraulic conductivity values were determined as 3 × 10−10 m/s and 7 × 10−11 m/s for sand-bentonite and zeolite-bentonite mixtures, respectively. The Ca+2 element showed a decrease in the outlet samples of sand-bentonite mixture test where an increase in zeolite-bentonite mixture outlet samples were measured showing that Ca+2 element was taken by sand-bentonite mixture and released by zeolite-bentonite mixture. Regarding the preliminary results, sand-bentonite mixture was found to be more successful to uptake Ca, Mg, Fe, and Mn where zeolite-bentonite mixture was more successful to uptake Ba, Ti, Cr, As, S, and Na when the permeant was Manisa Uzunburun leachate. Both soil mixtures hydraulic conductivities were found to be low enough to act as a liner; however, zeolite-bentonite mixture was found to be more successful when regarding the hydraulic conductivity and chemical stability.
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