Beside advection-dispersion phenomena, colloid transport in saturated porous media is controlled by particle-particle and particle-collector interactions, that result in deposition (attachment) and release (detachment) kinetics, strongly affected by hydrochemical parameters. The present study develops and depicts a colloid transport model, where mobilization and immobilization onto the solid matrix are taken into consideration, and the effect of transients in ionic strength (i.e. induced by the release of landfill leachate) is systematically addressed and quantified by explicitly including a salt transport equation in the set of the partial differential model equations. Semi-empirical correlations between attachment/detachment coefficients and ionic strength are proposed, and used to tie the salt and colloid transport equations. The model is implemented in a finite-differences numerical code, called MNMs (Micro-and Nanoparticle transport, filtration and clogging Model - Suite), that takes into consideration two distinct interaction sites with both linear and blocking (i.e. limited to a maximum colloid concentration onto the solid phase) attachment kinetics. The code can be downloaded from http://areeweb.polito.it/ricerca/groundwater/software/MNMs.php. MNMs code was validated comparing the results with well-established analytical and numerical solutions for colloid transport, applied in constant ionic strength conditions. The model was then used for interpreting a number of laboratory tests in 1D geometry, exploring a wide range of ionic strengths (1 to 300 mM) both in constant and transient conditions.

MNMs: a numerical model for the simulation of nanoparticles transport from landfills under transient ionic strength / Tosco, TIZIANA ANNA ELISABETTA; Bianco, Carlo; Sethi, Rajandrea. - ELETTRONICO. - (2014). (Intervento presentato al convegno COST Action ES1205 - WG1 ThinkTank Meeting Engineered Nanomaterials in Landfills tenutosi a Dübendorf, Switerland nel 17-18 November 2014).

MNMs: a numerical model for the simulation of nanoparticles transport from landfills under transient ionic strength

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

Abstract

Beside advection-dispersion phenomena, colloid transport in saturated porous media is controlled by particle-particle and particle-collector interactions, that result in deposition (attachment) and release (detachment) kinetics, strongly affected by hydrochemical parameters. The present study develops and depicts a colloid transport model, where mobilization and immobilization onto the solid matrix are taken into consideration, and the effect of transients in ionic strength (i.e. induced by the release of landfill leachate) is systematically addressed and quantified by explicitly including a salt transport equation in the set of the partial differential model equations. Semi-empirical correlations between attachment/detachment coefficients and ionic strength are proposed, and used to tie the salt and colloid transport equations. The model is implemented in a finite-differences numerical code, called MNMs (Micro-and Nanoparticle transport, filtration and clogging Model - Suite), that takes into consideration two distinct interaction sites with both linear and blocking (i.e. limited to a maximum colloid concentration onto the solid phase) attachment kinetics. The code can be downloaded from http://areeweb.polito.it/ricerca/groundwater/software/MNMs.php. MNMs code was validated comparing the results with well-established analytical and numerical solutions for colloid transport, applied in constant ionic strength conditions. The model was then used for interpreting a number of laboratory tests in 1D geometry, exploring a wide range of ionic strengths (1 to 300 mM) both in constant and transient conditions.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2579136
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