Convective‐dispersive solute transport with a combined equilibrium and kinetic adsorption model

Cameron, Dale R.; Klute, A.

doi:10.1029/wr013i001p00183

Cited by 346 publications

(167 citation statements)

References 15 publications

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“…The three-dimensional simulation approach was employed for the simulation of NOM transport, with a chemical sorption model previously used to describe NOM transport [Jardine et al, 1992;Mas-Pla, 1993] included in the numerical model. The amount of NOM adsorbed to the aquifer was modeled by a two-site sorption: Type 1 sites are assumed to be instantaneous and reversible, while type 2 sites follow reversible first-order kinetics with respect to the adsorbed solute mass [Cameron and Klute, 1977]. The velocity field and boundary and initial conditions were identical to that of the simulation for chloride during August-September 1992 (see Mas-Pla [1993] for details), except that the NOM injection concentration (Figure 3) was used at the injection well.…”

Section: Resultsmentioning

confidence: 99%

Field Tracer Tests on the Mobility of Natural Organic Matter in a Sandy Aquifer

McCarthy¹,

Gu²,

Liang³

et al. 1996

Water Resources Research

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Abstract. The field-scale transport of natural organic matter (NOM) was examined in a two-well forced gradient injection experiment in a sandy, coastal plain aquifer in Georgetown, South Carolina. Spatial moments described the migration of the center of mass of NOM and conservative tracer. Temporal moments were used to estimate mass loss and retardation of the NOM along a transect of six sampling locations at two depths and at the withdrawal well. Large differences were observed in transport behavior of different subcomponents of NOM. Larger and more strongly binding NOM components in the injection solution are postulated to adsorb and displace weakly binding, low-molecular weight NOM in groundwater. Conversely, NOM components that were similar to the groundwater NOM were transported almost conservatively, presumably due to ''passivation'' of the aquifer by previously adsorbed components of the groundwater NOM. NOM may thus exhibit two types of effects on contaminant dynamics in the subsurface. When the equilibria between solution and solid phase NOM is disrupted by introduction of a novel source of NOM, descriptions of the multicomponent transport process are complex and predictive modeling is problematic. Because of the differences in transport behavior of NOM subcomponents, the chemical properties and, more importantly, the functional behavior of NOM with respect to contaminant migration will vary with time and distance along a flow path. However, when groundwater NOM exists at a steady state with respect to adsorption on aquifer surfaces, the migration of NOM, and the contaminant-NOM complex, may be approximated as the transport of a conservative solute.

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Section: Resultsmentioning

confidence: 99%

Field Tracer Tests on the Mobility of Natural Organic Matter in a Sandy Aquifer

McCarthy¹,

Gu²,

Liang³

et al. 1996

Water Resources Research

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“…Equações que consideram o não-equilíbrio de sorção, fundamentadas na forma de um modelo bicontínuo de algum tipo, representadas por processos químicos (sorção em dois diferentes tipos de sítio de sorção, um em equilíbrio direto com a solução -sorção instantânea; e outro em não-equilíbrio -sorção dependente do tempo) ou físicos (a matriz do solo consistindo de uma região onde a água se move e outra onde não há o movimento da água, mas há o movimento do soluto) têm sido usados com sucesso para prever o transporte de solutos que reagem com a matriz (Cameron & Klute, 1977;van Genuchten et al, 1977;Kookana et al, 1993;Guo & Wagenet, 1999). Ambos os modelos, baseados nos processos químicos e físicos de não-equilíbrio de sorção, podem ser descritos numa mesma equação matemática (Nkedi-Kizza et al, 1984).…”

Section: Introductionunclassified

“…Nesse caso, os sorventes são assumidos como tendo dois tipos de sítios de sorção. Um onde a sorção é instantânea e outro onde a sorção apresenta taxa limitada (Cameron & Klute, 1977). Este segundo, teoricamente, representa a difusão lenta do soluto para o interior das substâncias húmicas e/ou dos microagregados argilo-húmicos do solo.…”

Section: Introductionunclassified

Comportamento do glifosato no solo e deslocamento miscível de atrazina

Prata¹

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“…This method can be used for determining the spatial moments of solute concentration in homogeneous columns. In practical applications other simplified models such as one-site models (Bahr and Rubin, 1987;Lapidus and Amundson, 1952;Oddson et al, 1970;Rao et al, 1980), two-site models (Cameron and Klute, 1977;Selim et al, 1976, andNkedi-Kizza et al, 1984) or multiple-rate models (Haggerty and Gorelick, 1995) are used. Rao et al (1980) also showed the failure of one-site models manifested as an apparent time dependence of the exchange rate coefficient.…”

Section: Introductionmentioning

confidence: 99%

Approximation of a radial diffusion model with a multiple-rate model for hetero-disperse particle mixtures

Massoudieh¹,

Ju²,

Young³

et al. 2008

Journal of Contaminant Hydrology

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An innovative method is proposed for approximation of the set of radial diffusion equations governing mass exchange between aqueous bulk phase and intra-particle phase for a heterodisperse mixture of particles such as occur in suspension in surface water, in riverine/estuarine sediment beds, in soils and in aquifer materials. For this purpose the temporal variation of concentration at several uniformly distributed points within a normalized representative particle with spherical, cylindrical or planar shape is fitted with a 2-domain linear reversible mass exchange model. The approximation method is then superposed in order to generalize the model to a hetero-disperse mixture of particles. The method can reduce the computational effort needed in solving the intra-particle mass exchange of a hetero-disperse mixture of particles significantly and also the error due to the approximation is shown to be relatively small. The method is applied to describe desorption batch experiment of 1,2-Dichlorobenzene from four different soils with known particle size distributions and it could produce good agreement with experimental data.

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Convective‐dispersive solute transport with a combined equilibrium and kinetic adsorption model

Cited by 346 publications

References 15 publications

Field Tracer Tests on the Mobility of Natural Organic Matter in a Sandy Aquifer

Field Tracer Tests on the Mobility of Natural Organic Matter in a Sandy Aquifer

Comportamento do glifosato no solo e deslocamento miscível de atrazina

Approximation of a radial diffusion model with a multiple-rate model for hetero-disperse particle mixtures

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