Transport of polymer stabilized nano-scale zero-valent iron in porous media

This study presents a set of laboratory-scale transport experiments and numerical simulations evaluating carboxymethyl cellulose (CMC) polymer stabilized nano-scale zero-valent iron (nZVI) transport. The experiments, performed in a glass-walled two-dimensional (2D) porous medium system, were conduct...

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Bibliographic Details
Published in:Journal of contaminant hydrology 2018-05, Vol.212, p.65-77
Main Authors: Mondal, Pulin K., Furbacher, Paul D., Cui, Ziteng, Krol, Magdalena M., Sleep, Brent E.
Format: Article
Language:English
Subjects:
Carboxymethylcellulose Sodium - chemistry
Colloids
Iron - chemistry
Metal Nanoparticles - analysis
Metal Nanoparticles - chemistry
Nanoscale zero-valent iron
Polymers - chemistry
Porosity
Silicon Dioxide
Solute and colloid transport
Viscosity
Viscous fingering
Water
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Summary:This study presents a set of laboratory-scale transport experiments and numerical simulations evaluating carboxymethyl cellulose (CMC) polymer stabilized nano-scale zero-valent iron (nZVI) transport. The experiments, performed in a glass-walled two-dimensional (2D) porous medium system, were conducted to identify the effects of water specific discharge and CMC concentration on nZVI transport and to produce data for model validation. The transport and movement of a tracer lissamine green B® (LGB) dye, CMC, and CMC-nZVI were evaluated through analysis of the breakthrough curves (BTCs) at the outlets, the time-lapsed images of the plume, and retained nZVI in the sandbox. The CMC mass recovery was >95% when injected alone and about 65% when the CMC-nZVI mixture was used. However, the mean residence time of CMC was significantly higher than that of LGB. Of significance for field implementation, viscous fingering was observed in water displacement of previously injected CMC and CMC-nZVI. The mass recovery of nZVI was lower (
ISSN:0169-7722
1873-6009
DOI:10.1016/j.jconhyd.2017.11.004