Numerical modeling of leachate migration in compacted tropical laterite soil

11th International Conference on Geotechnical Engineering in Tropical Regions;1st International Conference on Highway and Transportation Engineering 2019

矿业工程;运输工程

Bello Yamusa, Yamusa^1^2 ; Alias, Noraliani^1 ; Ahmad, Kamarudin^1 ; Sa'Ari, Radzuan^1 ; Zurairahetty Mohd Yunus, Nor^1

Faculty of Engineering, School of Civil Engineering, Universiti Teknologi Malaysia, Johor, Johor Bahru

81310, Malaysia^1

Department of Civil Engineering, Nuhu Bamalli Polytechnic, Zaria

810001, Nigeria^2

关键词: Compacted soil liners;    Contaminant transport;    Digital image technique;    Full-scale experiment;    Leachate contamination;    Long term performance;    Nondestructive methods;    Optimum moisture content;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/527/1/012001/pdf
DOI  :  10.1088/1757-899X/527/1/012001

来源: IOP

【 摘 要 】

To protect groundwater from leachate contamination in sanitary landfill involve the use of hydraulic barriers i.e. liners and covers. Nonetheless, can these barriers continue to impede the migration of leachate over a long period? A full-scale experiment would be prohibitively costly and time consuming. The only feasible recourse therefore is to construct a model, which reasonably portray the behaviour of the full-scale system and simulate the relevant physical parameters and describes the overall significant characteristics of the transport phenomena. This research investigates the long-term performance of compacted tropical laterite soil liners at various gradations against leachate migration in sanitary landfills using numerical modeling. Series of laboratory experimentation were carried out using three different laterite soil gradations (30%, 40% and 50% with respect to fines content) compacted at optimum moisture content using British Standard light energy. Leachate was poured on the compacted soil in an acrylic column and its migration was monitored using Digital Image Technique (DIT). Subsequently, PetraSim computer software a graphical interface used to solve problems related to contaminant transport was applied to predict the velocity of leachate migration. The predicted velocity values for 30%, 40% and 50% fines are 4.5 x 10-7 m/s, 7 x 10-9 m/s, and 8 x 10-10 m/s, respectively. This shows that the laterite soil with 50% fines content is more compatible with the leachate and can be used as soil liner. The outcome of this research would enable designers to use non-destructive method to monitor and predict leachate migration in compacted soil liners to simulate leachate migration in waste containment applications.