Abstract
Nanoscale zero-valent iron (NZVI) particles can be used for in situ groundwater remediation. The spatial particle distribution plays a very important role in successful and efficient remediation, especially in heterogeneous systems. Initial sand permeability (k 0) influences on spatial particle distributions were investigated and quantified in homogeneous and heterogeneous systems within the presented study. Four homogeneously filled column experiments and a heterogeneously filled tank experiment, using different median sand grain diameters (d 50), were performed to determine if NZVI particles were transported into finer sand where contaminants could be trapped. More NZVI particle retention, less particle transport, and faster decrease in k were observed in the column studies using finer sands than in those using coarser sands, reflecting a function of k 0. In heterogeneous media, NZVI particles were initially transported and deposited in coarse sand areas. Increasing the retained NZVI mass (decreasing k in particle deposition areas) caused NZVI particles to also be transported into finer sand areas, forming an area with a relatively homogeneous particle distribution and converged k values despite the different grain sizes present. The deposited-particle surface area contribution to the increasing of the matrix surface area (θ) was one to two orders of magnitude higher for finer than coarser sand. The dependency of θ on d 50 presumably affects simulated k changes and NZVI distributions in numerical simulations of NZVI injections into heterogeneous aquifers. The results implied that NZVI can in principle also penetrate finer layers.
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This research was integrated in the joint project “NAPASAN” (Nanoparticles for ground water remediation) and was funded by the Federal Ministry of Education and Research (BMBF, Grant Number 03X0097D, NanoNature, Wing).
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Strutz, T.J., Hornbruch, G., Dahmke, A. et al. Influence of permeability on nanoscale zero-valent iron particle transport in saturated homogeneous and heterogeneous porous media. Environ Sci Pollut Res 23, 17200–17209 (2016). https://doi.org/10.1007/s11356-016-6814-y
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DOI: https://doi.org/10.1007/s11356-016-6814-y