NZVI) have been studied in recent years for the remediation of contaminated aquifers. The suspensions are injected into the subsurface to generate a reactive zone, and consequently the prediction of the particles distribution during the injection is a key aspect in the design of a field-scale injection. Shear thinning fluids exhibit high viscosity in static conditions, improving the colloidal stability of iron particles, and lower viscosity at high flow rates enabling the injection at limited pressures. In this work, laboratory and pilot field tests for NZVI injection in saturated porous media are reported. NZVI was dispersed in guar gum solutions, and the transport behaviour under several polymer concentrations and injection rates was assessed in column tests. Based on the experimental results, a modelling approach is proposed to simulate the transport in porous media of nanoscale iron slurries, implemented in E-MNM1D and its interface MNMs (www.polito.it/groundwater/software ). Colloid transport mechanisms are controlled by particle-collector and particle-particle interactions, usually modelled by a non equilibrium kinetic model accounting for deposition and release processes. The key aspects included in the E-MNM1D are clogging phenomena (i.e. reduction of porosity and permeability due to particles deposition), and the rheological properties of the carrier fluid (in this project, guar gum solution). The influence of colloid transport on porosity, permeability, and fluid viscosity is explicitly lumped into the model and the shear-thinning nature of the iron slurries is described by a modified Darcy law generalized for non Newtonian fluids.

Transport in porous media of iron nanoparticles for the remediation of contaminated aquifer systems / Tosco, TIZIANA ANNA ELISABETTA; Bianco, Carlo; Sethi, Rajandrea. - ELETTRONICO. - (2014). (Intervento presentato al convegno Nanosafety Forum for Young Scientists tenutosi a Siracusa, Italy nel 9-10 October 2014).

Transport in porous media of iron nanoparticles for the remediation of contaminated aquifer systems

TOSCO, TIZIANA ANNA ELISABETTA;BIANCO, CARLO;SETHI, RAJANDREA
2014

Abstract

NZVI) have been studied in recent years for the remediation of contaminated aquifers. The suspensions are injected into the subsurface to generate a reactive zone, and consequently the prediction of the particles distribution during the injection is a key aspect in the design of a field-scale injection. Shear thinning fluids exhibit high viscosity in static conditions, improving the colloidal stability of iron particles, and lower viscosity at high flow rates enabling the injection at limited pressures. In this work, laboratory and pilot field tests for NZVI injection in saturated porous media are reported. NZVI was dispersed in guar gum solutions, and the transport behaviour under several polymer concentrations and injection rates was assessed in column tests. Based on the experimental results, a modelling approach is proposed to simulate the transport in porous media of nanoscale iron slurries, implemented in E-MNM1D and its interface MNMs (www.polito.it/groundwater/software ). Colloid transport mechanisms are controlled by particle-collector and particle-particle interactions, usually modelled by a non equilibrium kinetic model accounting for deposition and release processes. The key aspects included in the E-MNM1D are clogging phenomena (i.e. reduction of porosity and permeability due to particles deposition), and the rheological properties of the carrier fluid (in this project, guar gum solution). The influence of colloid transport on porosity, permeability, and fluid viscosity is explicitly lumped into the model and the shear-thinning nature of the iron slurries is described by a modified Darcy law generalized for non Newtonian fluids.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2579144
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