Relating Non-equilibrium Solute Transport and Porous Media Physical Characteristics

Pugliese, Lorenzo; Straface, Salvatore; Mendoza, Benito; Poulsen, Torben

doi:10.1007/s11270-015-2353-2

Cited by 7 publications

(4 citation statements)

References 43 publications

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“…(10) shows that a low u dispersivity is proportional to particle roundness, and thus, dispersion seems to be higher in media consisting of spherical particles than those consisting of nonspherical particles. This is in contrast with the behavior of α at higher velocities observed in earlier studies, where d m becomes important (De Carvalho and Delgado, 2003;Delgado, 2006;Pugliese et al, 2013c). Figure 5 shows α values as fitted by Eq.…”

Section: Resultscontrasting

confidence: 73%

“…Figure 6 shows that, in contrast to α, m is generally dependent on d m but almost independent of R. This behavior is clearly visible for Leca (Fig. Figure 6 further indicates that, although m at higher u (as found in previous studies including Pugliese et al, 2013c) may be assumed close to 1, this is not the case for low u where it varies significantly especially in response to roundness. The dependency of m on R and d m is less evident for gravel and granite, and it is probably caused by the limited number of points investigated.…”

Section: Resultsmentioning

confidence: 62%

“…Soft Teflon tubing with an inner diameter of 4 mm was used to connect each component of the system (Pugliese et al, 2013b;2013c). Packing was done with care to reduce inhomogeneities in packing density.…”

Section: Methodsmentioning

confidence: 99%

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Estimating Solute Dispersion Coefficients in Porous Media at Low Pore Water Velocities

Pugliese

Poulsen

2014

Soil Science

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The relationship between solute dispersion coefficient (D mech ) and pore water velocity during chloride transport in porous media with different particle characteristics at low pore water velocities (u < 1 cm min −1 ), relevant for ground water flow conditions, was investigated. Data for 29 porous media with very different particle shapes (ranging from almost spherical to very angular) and particle sizes (0.088-12 mm) at different velocities (340 breakthrough curves) were used in the analyses. The analysis showed that D mech at low u is significantly different from that at higher u. Whereas the u -D mech relationship generally can be assumed linear at higher u (based on observations in earlier studies), the data presented in this study clearly show that this is not the case at low u. The results further indicated that D mech at low u is strongly related to porous medium particle shape and to some degree also to medium particle size range and mean particle diameter. As the current knowledge about dispersion at low u and its dependency on porous medium properties is very limited, the results obtained in this study represent a significant addition to this understanding. A set of expressions for predicting D mech at low u from medium properties was developed. These expressions yield good accuracy across all 29 media, thus providing a means for predicting dispersion at low u across a very wide range of media.

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Section: Resultscontrasting

confidence: 73%

Section: Resultsmentioning

confidence: 62%

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Estimating Solute Dispersion Coefficients in Porous Media at Low Pore Water Velocities

Pugliese

Poulsen

2014

Soil Science

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“…As-contaminated groundwater, used for drinking and irrigation, is also a severe problem in large part of Bangladesh. Solute transport through porous media is important for a wide range of applications, such as groundwater and soil remediation, salt water intrusion, drinking water purification, and wastewater treatment (Pugliese et al, 2015). It is also important for plant growth, chemical reactions (such as sorption, precipitation and redox) and for understanding the environmental impact of waste dumping sites and surface-applied chemicals, such as pesticides and fertilizers (Karup et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Relation of reactive solute-transport parameters to basic soil properties

Mojid

Hossain

Wyseure

2018

Eurasian Journal of Soil Science (Ejss)

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Solute-transport parameters are needed to assess the pollution risks of soil and groundwater resources. A reliable estimate of these parameters from easily measurable soil properties is therefore important. So, the correlations of the transport parameters for one metalloid compound (NaAsO2), six heavy metal compounds (Cd(NO3)2, Pb(NO3)2, Ni(NO3)2, ZnCl2, CuSO4 and Co(NO3)2), two pesticides (cartap and carbendazim) and one inert salt (CaCl2) with some basic properties of eight agricultural soils of Bangladesh were investigated. The purpose of this study was to generate information for development of non-parametric pedo-transfer functions for reactive solute transport through soils. The transport experiments with the solutes were done in repacked soil columns under unsaturated steady-state water flow conditions. The major solute-transport parametersvelocity of transport (V), dispersion coefficient (D), dispersivity (), retardation factor (R) and Peclet number (P)-were determined by analysing solute breakthrough curves (BTCs). The basic soil properties pertinent to solute transport: clay content, median grain diameter (D50), pore-size distribution index (n), bulk density (), organic carbon content (C) and pH were determined. The associations of the solute-transport parameters with these soil properties were investigated and evaluated. Both the solute dispersivity and retardation factor increased significantly (p<0.05) ( linearly and R following power law) with the increase in soil clay content. Dispersivity significantly decreased with the increase in median grain diameter following power law. The V, D,  and P values were weakly and negatively correlated with the soil bulk density. Retardation factor, R, was moderately and positively correlated with the ratio of clay content to organic carbon content. Dispersivity decreased but P increased, both significantly, with increasing poresize distribution index, n. V, D and P were positively correlated with soil pH, while R and  were negatively correlated with it. The correlation of the solute-transport parameters with soil properties being significant (p < 0.05), in most cases, provides strong possibility of predicting solute-transport parameters from the basic soil properties through the development of pedo-transfer functions.

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