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http://dx.doi.org/10.7464/ksct.2019.25.3.206

Development of Numerical Model for Simulating Remediation Efficiency Using Surfactant in a NAPL Contaminated Area  

Suk, Heejun (Korea institute of geoscience and mineral resources, geologic environment research)
Son, Bongho (GNS Engineering., co. Ltd.)
Park, Sungmin (GNS Engineering., co. Ltd.)
Jeon, Byonghun (Hanyang University, major in earth resources and environmental engineering)
Publication Information
Clean Technology / v.25, no.3, 2019 , pp. 206-222 More about this Journal
Abstract
Recently, various multiphase flows have been developed, and among them some models have been commercialized. However, most of them have been developed based on a pressure-based approach; therefore, various numerical difficulties were involved inherently. Accordingly, in order to overcome these numerical difficulties, a multiphase flow model, MultiPhaSe flow (MPS), following a fractional-flow based approach was developed. In this study, by combining a contaminant transport module describing an enhanced dissolution effect of a surfactant with MPS, a MultiPhaSe flow and TranSport (MPSTS) model was developed. The developed model was verified using the analytical solution of Clement. The MPSTS model can simulate the process of surfactant enhanced aquifer remediation including interphase mass transfer and contaminant transport in multiphase flow by using the coupled particle tracking method and Lagrangian-Eulerian method. In this study, a surfactant was used in a non aqueous phase liquid (NAPL) contaminated area, and the effect of hydro-geological heterogeneity in the layered media on remediation efficiency was studied using the developed model. According to the numerical simulation, when hydraulic conductivity in a lower layer is 10 times, 20 times, and 50 times larger than that in an upper layer, the concentration of dissolved diesel in the lower layer is much higher than that in the upper layer because the surfactant moves faster along the lower layer owing to preferential flow; thus, the surfactant enhances dissolution of residual non aqueous phase liquid in the lower layer.
Keywords
non aqueous phase liquid (NAPL); Lagrangian-Eulerian; Surfactant; Numerical simulation; Heterogeneity;
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