Performance of Sand Bentonite Mixtures Under Leachate Percolation
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2023
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Abstract
The permeability behavior of sand bentonite mixtures which were proposed for use of liner was investigated by using original leachate. In this regard, the 3-axial hydraulic conductivity tests were run while the chemical composition of the inlet and outlet leachate samples were identified. In addition, the adsorbed contaminants and the soil fabric of the mixtures were pictured via microscopic image technics. In literature, the conventional test procedures generally comprise the permeability values of the liner and/or filter materials which were determined by using tap water, this study suggested determining the hydraulic conductivities under the effect of leachate. Thus, leachate samples were taken from landfill sites located in Manisa Uzunburun municipal solid waste site. The pH of the environment for each test was found to be basic. The electrical conductivity values for each test were found to be under 1. This situation implies that the cation exchange process was not completed when the tests were ended. The hydraulic conductivity value of 10% sand-bentonite mixture sample was found to be higher when the inlet fluid was original leachate. When the inlet and outlet samples of leachates were investigated, it is found that sand-bentonite mixtures held Ca+2 while releasing Na+ which may be one of the main causes of the increase in hydraulic conductivity. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd 2023.