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Article

Injection of Zerovalent Iron Gels for Aquifer Nanoremediation: Lab Experiments and Modeling

1
Department of Environment, Land and Infrastructure Engineering, Politecnico di Torino, corso Duca degli Abruzzi 24, 10129 Torino, Italy
2
Decarbonisation and Environmental Laboratories, Eni S.p.A., Via F. Maritano 26, 20097 San Donato Milanese, Italy
*
Author to whom correspondence should be addressed.
Water 2020, 12(3), 826; https://doi.org/10.3390/w12030826
Received: 19 February 2020 / Revised: 9 March 2020 / Accepted: 12 March 2020 / Published: 15 March 2020
One of the main technical problems faced during field-scale injections of iron microparticles (mZVI) for groundwater nanoremediation is related to their poor colloidal stability and mobility in porous media. In this study, a shear-thinning gel, composed of a mixture of two environmentally friendly biopolymers, i.e., guar gum and xanthan gum, was employed to overcome these limitations. The slurry rheology and particle mobility were characterized by column transport tests. Then, a radial transport experiment was performed to mimic the particle delivery in more realistic conditions. The gel, even at a low polymeric content (1.75 g/L), proved effective in enhancing the mobility of high concentrated mZVI suspensions (20 g/L) in field-like conditions. The high radius of influence (73 cm) and homogeneous iron distribution were achieved by maintaining a low injection overpressure (<0.4 bar). Based only on the information derived from column tests, the MNMs 2018 software (Micro- and Nanoparticle transport, filtration, and clogging Model-Suite) was able to predict the particle distribution and pressure build-up measured in the radial domain. Experimental and simulated results showed good agreement, thus proving that a simplified experimental-modeling procedure based on 1D column tests could be used to effectively upscale the slurry behavior to more representative scales, e.g., radial domains. View Full-Text
Keywords: groundwater remediation; nanoremediation; ZVI gel; shear-thinning fluids; subsurface injection groundwater remediation; nanoremediation; ZVI gel; shear-thinning fluids; subsurface injection
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MDPI and ACS Style

Mondino, F.; Piscitello, A.; Bianco, C.; Gallo, A.; de Folly D’Auris, A.; Tosco, T.; Tagliabue, M.; Sethi, R. Injection of Zerovalent Iron Gels for Aquifer Nanoremediation: Lab Experiments and Modeling. Water 2020, 12, 826. https://doi.org/10.3390/w12030826

AMA Style

Mondino F, Piscitello A, Bianco C, Gallo A, de Folly D’Auris A, Tosco T, Tagliabue M, Sethi R. Injection of Zerovalent Iron Gels for Aquifer Nanoremediation: Lab Experiments and Modeling. Water. 2020; 12(3):826. https://doi.org/10.3390/w12030826

Chicago/Turabian Style

Mondino, Federico, Amelia Piscitello, Carlo Bianco, Andrea Gallo, Alessandra de Folly D’Auris, Tiziana Tosco, Marco Tagliabue, and Rajandrea Sethi. 2020. "Injection of Zerovalent Iron Gels for Aquifer Nanoremediation: Lab Experiments and Modeling" Water 12, no. 3: 826. https://doi.org/10.3390/w12030826

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