Abstract
The use of hydraulic barriers in sanitary landfills has become an impeccable means of protecting the groundwater system from leachate. A question to be asked is, can these barriers continue to impede the migration of leachate over a long period? This paper investigates the phenomenon of leachate migration in compacted laterite soil used as liner in sanitary landfills. An experiment was carried out using laterite soil compacted at optimum moisture content using Standard Proctor energy. Leachate was poured on the compacted soil in an acrylic column and its migration was monitored using Digital Image Technique (DIT). The DIT capture photographic images at successive intervals of time which were fed through an image processing code to convert them to hue-saturation-intensity (HSI) format with the help of Surfer and Matlab computer softwares. Subsequently, PetraSim computer software was applied to predict the velocity behavior. The predicted velocity value shows that the laterite soil is compatible with the leachate and can be used as soil liner. The outcome of this study would enable designers to use non-destructive method to monitor and predict leachate migration in compacted soil liners to simulates leachate migration in waste containment applications.
Highlights
Computer modeling approach of groundwater flows and transport systems has become imperative
The laterite soil is used in this study is reddish in color and was extracted using the method of disturbed sampling from Skudai campus (Johor) which is located at latitude 1o33'39"N and longitude 103o38'44"E of Universiti Teknologi Malaysia (UTM)
3.1 Digital Image Analysis The 2D Contour plot provide detail and useful information to understand the characteristic of leachate migration behaviour
Summary
Computer modeling approach of groundwater flows and transport systems has become imperative. The groundwater management, policy making and planning processes support an important practice which involve the use of groundwater modeling. These models provide a systematic background for understanding the mechanisms of groundwater systems and the procedures that effect their quality. Before remediating contaminated groundwater of a specified field, it is necessary to understand the physical, chemical and biological processes that occur in the field. Analytical solutions are usually possible only for simple geometries, homogeneous aquifers, and simple boundary conditions [3]
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