The simulation of nano-scale zero valent iron (NZVI) transport in saturated soil layer using trajectory analysis method

計畫名稱:The simulation of nano-scale zero valent iron (NZVI) transport in saturated soil layer using trajectory analysis method

所屬單位:環工所

研究團隊:吳先琪

計畫主持人:吳先琪

研究人員:魏裕庭

資源需求:Fortran compiler, IMSL library

使用期間:2009/07~

研究主題:
The simulation of nano-scale zero valent iron (NZVI) transport in saturated soil layer using trajectory analysis method

研究內容概述:
Suspended nano-scale particles are subject to some scavenging factors while they are migrating through porous media, which will diminish the practicability of deploying nano-scale iron in the groundwater aquifers. These factors include particle size, pH value, ion intensity, suspended liquid characteristics and groundwater velocity, etc. When particle size is much smaller than the pore size in saturated soil layer, the effect of Brownian Diffusion will become more significant for transport. This phenomenon is similar to the colloidal particles transporting through filter bed in industrial applications. Hence, in this study we simulated the transport behavior of the nanoscale particles in groundwater by applying the same methodology as the simulation of colloid particle transport in porous media. The pore structure in soil layer was characterized by the constricted tube model. The absorbing situation of particles on soil surface was determined by trajectory analysis in the constricted tube. Simulations are going to be performed on a two-dimensional network (NL=60×60) at constant flow rate. The penetration ratio C/C0 could be derived from the Brownian trajectory analysis and the stochastic simulation procedure in different types of DLVO interaction energy curves.

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