Abstract :
A bottom liner of landfill is intended to be a low permeable barrier, which is laid down under engineered landfill sites. Until it deteriorates, the liner retards migration of leachate, and its toxic constituents, into underlying aquifers or nearby rivers, causing spoil of the local water. To improve the quality of local clayey soil (from kuet campus at a depth of 5-7feet below the ground level) as a bottom liner of landfill an admixture (bentonite clay) has been mixed with that soil at different proportions. The criteria as clay liner such as (coefficient of permeability) k≤ 1x10-7cm/sec, (plasticity index) pi>7%, 30% fines of which 15% is clay and (water content) w%> plastic limit has been checked with the mix of bentonite respectively 0%, 7% and 10% (daniel & coerner,1995). All criteria were not met when checked without mixing any amount of bentonite with sample specimen. After that, 7% bentonite was mixed with the soil and slight improvement was found in the properties of soil. Fi
Keyword :
Landfill, bentonite as admixture ,bottom liner and safe disposal of solid waste