Abstract
Controlled emplacement of polyelectrolyte-modified NZVI at a high particle concentration (1–10 g/L) is needed for effective in situ subsurface remediation. For this reason, a modeling tool capable of predicting polyelectrolyte-modified NZVI transport is imperative. However, the deep bed filtration theory is invalid for this purpose because several phenomena governing the transport of polyelectrolyte-modified NZVI in saturated porous media, including detachment, particle agglomeration, straining, and porous media ripening, violate the fundamental assumption of such a classical theory. Thus, this chapter critically reviews the literature of each phenomenon with various kinds of nanoparticles with a special focus on polyelectrolyte-modified NZVI. Then, each phenomenon is elaborated using three kinds of mathematical models, including mechanistic (such as extended DLVO theory), mechanistic-based empirical (correlations to predict NZVI agglomeration and deposition), and continuum-based (Eulerian continuum-based models). These proposed modeling tools can be applied at various scales from column experiments (1-D) to field-scaled operations (3-D) for designing NZVI injection and emplacement in the subsurface.
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Acknowledgments
This work was supported in part by (1) the Thailand Research Fund (TRF) MRG5680129; (2) the National Nanotechnology Center (Thailand), a member of the National Science and Technology Development Agency, through grant number P-11-00989; (3) the National Research Council (R2556B070); and (4) Taiwan’s Ministry of Science and Technology (MOST) under grant no. 104-2221-E-009-020-MY3.
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Phenrat, T., Babakhani, P., Bridge, J., Doong, Ra., Lowry, G.V. (2019). Mechanistic, Mechanistic-Based Empirical, and Continuum-Based Concepts and Models for the Transport of Polyelectrolyte-Modified Nanoscale Zerovalent Iron (NZVI) in Saturated Porous Media. In: Phenrat, T., Lowry, G. (eds) Nanoscale Zerovalent Iron Particles for Environmental Restoration. Springer, Cham. https://doi.org/10.1007/978-3-319-95340-3_6
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