Abstract
This study investigates the characteristics of natural zeolite amended kaolin clay, to be used as an impervious liner in the landfill. A landfill liner or composite liner is a low permeable barrier, which is laid down under engineered landfill sites. The ingredient zeolite was chosen due to its high absorption capacity for heavy metals as well as pozzolanic properties. A B/Z ratio of 0.5 was found to be an ideal landfill liner material considering its low hydraulic conductivity. Hydraulic conductivity tests on zeolite-embedded clay liner systems show that the hydraulic conductivity of all the mixtures prepared with varying proportions of zeolite, meet the common regulatory requirements. The micro-porous structure of natural zeolite results in a very high absorption rate, which in turn reduces the hydraulic conductivity. In order to estimate the optimum dosage of zeolite to the clay mixture, an extensive study on the strength and compaction characteristics was done.
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