Investigation of Light Non-Aqueous Phase Liquid Migration Single and Double-Porosity Soil Using Light Transmission Visualization Method (LTV)
1 Faculty of Civil Engineering and Earth Resources, Universiti Malaysia Pahang, 26300 Gambang, Kuantan, Malaysia
2 Department of Civil Engineering, College of Engineering, Taibah University, Madinah, Saudi Arabia
3 Razak School of Engineering and Advanced Technology, Universiti Teknologi Malaysia, 54000 Kuala Lumpur, Malaysia
4 Centre of Earth Resources Research and Management, Universiti Malaysia Pahang, 26300, Gambang, Kuantan, Malaysia
a Corresponding author : firstname.lastname@example.org
Two experiments were conducted to investigate the migration of light non-aqueous phase liquid (LNAPL) in two different porous media using LTV technique. The first media was fine sand as a single-porosity and the second media was S300 kaolin as a double-porosity. The two media were packed separately in the flow chamber and then LNAPL was injected from the top of the model and the migration of LNAPL (Toluene) was observed using a digital camera connected to a laptop and controlled using special software. The images were captured according to a predetermined time interval set by the software. The results show a significant difference in the migration of LNAPL in the two porous media, where the migration in the double-porosity media was much faster than the migration in the single-porosity. This finding is due to the occurrence of inter-aggregate pores in the double-porosity soil structure. This paper shows that more attention should be given towards the pollution of the groundwater sources that are located within or near the double-porosity media especially the agricultural soil.
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