Investigation of light non-aqueous phase liquid migration single and double-porosity soil using light transmission visualization method (LTV)

• Main Authors: Alaziaza, M. Y. D., Ngien, S. K., Bob, M. M., Kamaruddin, S. A., Ishak, W. M. F.
• Format: Conference or Workshop Item
• Published: EDP Sciences 2016
• Subjects: T Technology (General)
• Online Access: http://eprints.utm.my/id/eprint/73344/; https://www.scopus.com/inward/record.uri?eid=2-s2.0-84969933295&doi=10.1051%2fmatecconf%2f20164703023&partnerID=40&md5=ade84461f478222dfdb7a703993659a3

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.