Abstract
: Landfill liners are underlying materials with low permeability whose main function is to mitigate the infiltration of toxic contents into ground water lying beneath. Landfill liners are primarily made of bentonite clay. Bentonite has a very low hydraulic conductivity, that might not be readily accessible, unlike kaolin which is found to have a lower hydraulic conductivity compared to that of bentonite and can be extensively obtained from numerous different sources. Explored, for the purposes of the present research paper, were various ratios of bentonite and kaolin and their hydraulic conductivity, in particular ratios of 90:10 kaolin to bentonite, 80:20 kaolin to bentonite, 70:30 kaolin to bentonite, 60:40 kaolin to bentonite and 50:50 kaolin to bentonite in an effort to achieve an acceptable barrier suitable as a liner / where tap water and ammonium solution were used as permeants. It was concluded that the ratios not lower than 20% bentonite (80:20, 70:30, 60:40 and 50:50) all had their hydraulic conductivity value reduced compared to the 100% kaolin.
Highlights
In the attainment of adequate management of waste and sustainable resource recovery, landfill might have an important role to play
For the purposes of the present research paper, were various ratios of bentonite and kaolin and their hydraulic conductivity, in particular ratios of 90:10 kaolin to bentonite, 80:20 kaolin to bentonite, 70:30 kaolin to bentonite, 60:40 kaolin to bentonite and 50:50 kaolin to bentonite in an effort to achieve an acceptable barrier suitable as a liner / where tap water and ammonium solution were used as permeants
This research outlines the changes detected in hydraulic conductivity and other significant index properties when ammonia permeant is passed through bentonite:kaolin mixtures when used as clay liner
Summary
In the attainment of adequate management of waste and sustainable resource recovery, landfill might have an important role to play. This research outlines the changes detected in hydraulic conductivity and other significant index properties when ammonia permeant is passed through bentonite:kaolin mixtures when used as clay liner. Compacted fine-grained clay soils were widely used as soil liners and covering in the floor of waste containment structures or landfills. The assessment of hydraulic conductivity is typically done by carrying-out a compatibility test where the specimen gets permeated with a sample of liquid simulating the anticipated liquid or the exact liquid to be contained These liquids are referred to as “non-standard liquids” so as to differentiate them from standard liquids like tap water, distilled water, deionized water, or a standard water, such as the 0.05 N CaSO4 solution prescribed in ASTM D 5084 (2010). Ammonia applied in this study had a concentration of 622.26 mg/l which was prepared in the laboratory and used as permeant on the soil in each case
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