Adsorption characteristics of layered soil as delay barrier of some organic contaminants: Experimental and numerical modeling

Dardouri, Sana; Sghaier, Jalila

doi:10.1016/j.envsoft.2018.09.003

Cited by 16 publications

(15 citation statements)

References 46 publications

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“…There are various relationships for estimating dispersivity such as [5,11,15] in which the transverse dispersivity is directly proportional to grain size. [7] have used the same dispersivity for all soils but this important property of porous media depends on the texture of soils,…”

Section: Resultsmentioning

confidence: 99%

“…Soil and solutions. All samples (sand, silty soil and clay) used in this study were collected from an industrial zone in the region of Sousse in Tunisia and their hydraulic parameters and retention curves were obtained using cell compression and mini disk infiltrometer by [7]. The reactive dye methylene blue used as adsorbate (basic blue 9, CI 52015) is cationic dye with a molecular formula C 16 H 18 CIN 3 S • 3H 2 O and a molar mass of 373.9 g/mol [7,8].…”

Section: Objects and Methodsmentioning

confidence: 99%

“…behavior in unsaturated layered soil to study the effect of capillary barrier on MB transport in our laboratory [7] (Fig. 1a).…”

Section: Objects and Methodsmentioning

confidence: 99%

“…Besides these influencing factors, the soil heterogeneity plays an important role in reducing chemical product infiltration. In fact, the presence of capillary barrier influences the transfer of both water and pollutant [7,19,17,23,24,24].…”

Section: Introductionmentioning

confidence: 99%

“…In fact, Solute transport in layered soils have been studied in many researchers [24] presents the combined effect of the capillary barrier and soil layer slope on the transport of water, bromide and nanoparticles through an unsaturated soil. They showed that under the effect of the capillary barrier water accumulated at the interface of the two materials and the sloped structure deflects flow in contrast to the structure with zero slope [33] proves that the contaminant spread faster in stratified field with a soft and highly permeable top layer and they concluded that soil parameters of the top layer are more critical than the lower but the results can be changed by controlling the thicknesses of layers [7] found that both experimental exploration and numerical simulation show that the three-layer capillary barrier cover system performs as inhibitor to minimize pollutant percolation and in capillary barrier, the MB kinetic adsorption is inversely proportional to the flow velocity.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of Dye on a Tunisian Unsaturated Layered Soil: Physical and Numerical Modeling

et al. 2020

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The main objectives of this study is to model the transport of methylene blue (MB) in homogenous and layered soils which has been studied experimentally by fixed bed column. The effect of soil stratification has been studied through numerical investigation based on the coupled solute transport model in three-layered soil. The effect of some significant parameters such as flow rate, initial concentration of MB, thickness of each layer and the numbers of layers on the breakthrough curves have been undertaken. A finite element analysis model was employed to predict the transport of MB in soils. A two dimensional model based on Richards equation and advection-dispersion equation coupled with adsorption model has been developed and an analytical model has been used to predict the dispersivity. The results shows that the soil heterogeneity has a significant effect on methylene blue (MB) adsorption through unsaturated layered media and the effect of the parameters of the upper layer of the soil is more significant than those of the lower layer but this effect can be controlled with the choice of the thicknesses of each layer.

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Section: Resultsmentioning

confidence: 99%

Section: Objects and Methodsmentioning

confidence: 99%

“…behavior in unsaturated layered soil to study the effect of capillary barrier on MB transport in our laboratory [7] (Fig. 1a).…”

Section: Objects and Methodsmentioning

confidence: 99%