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Retention of PAHs in a Mediterranean soil after different amendments

AutorCornejo, J. ; Bruna González, Felipe ; Real Ojeda, Miguel ; Guzmán Carrizosa, Ignacio ; Celis, R.
Palabras clavePolyciclic aromatic hydrocarbons (PAHs)
Soil remediation
Industrial wastes
Organo LDH
Organic waste (OIW)
Fecha de publicación26-sep-2015
EditorMediterranean Scientific Association of Environmental Protection
Citación18th International Symposium on Environmental Pollution and its Impact on Life in the Mediterranean Region. Book of abstracs: pag. 195 (2015)
ResumenPolynuclear aromatic hydrocarbons (PAHs) are a group of ubiquitous environmental contaminants, produced primarily as a result of incomplete combustion from predominantly anthropogenic sources including fossil fuel, biofuel, and vegetation fires. Previous studies have shown that PAHs are strongly sorbed by the soil organic matter. On the other hand, it is known that the addition of noncontaminant wastes to soils, besides improving soil physicochemical properties, can reduce the diffusion of organic pollutants from one compartment to another by increasing their sorption. The aim of this study was to evaluate the sorption capacity and the effect of soil addition of nonhazardous wastes such as a material like to gypsum (G), a waste from mining exploitation, wollanstonite (W) and an organic waste from olive oil production (OIW) on the fate of selected PAHs. Natural silicates like montmorillonite (SA) and bentonite (B) and a synthetic layered double hydroxide (HT) and their corresponding organoderivatives (SAHDTMA and HTDDS) were used as well. Sorption-desorption, leaching and dissipation studies were performed under laboratory conditions with a sandy-clay soil, unamended and amended with those materials. The results obtained showed that OIW and the nanocomposites (SAHDTMA and HTDDS) had a high affinity for the PAHs studied, as indicated by the obtained Kf values. The sorptive capacity increased with the hydrophobic character of the organic contaminant. The effectiveness of the used amendments on the PAHs retention increased in the following order: Gypsum ≈ Wollanstonite ≈ Bentonite < OIW < SA-HDTMA ≈ HTDDS. The affinity of the adsorbents was greater for high-molecular weight PAHs. Leaching experiments corroborated that organic residues and clay nanohybrids could be recommended as soil amendments for immobilizing PAHs in soils
Versión del editorhttp://www.mesaep.org/index.php?id=31399
Aparece en las colecciones: (IRNAS) Comunicaciones congresos
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