Metal transport parameters in residual soil with different structures percolated by an acidic solution

Eduardo Pavan Korf, Gláucia C. dos Santos, Nilo Cesar Consoli, Rafael Timbola, Antonio Thomé, Pedro Domingos Marques Prietto

In the proceedings of: GEO2011: 64th Canadian Geotechnical Conference, 14th Pan-American Conference on Soil Mechanics and Geotechnical Engineering, 5th Pan-American Conference on Teaching and Learning of Geotechnical Engineering

Session: Geoenvironmental Engineering

ABSTRACT: Acidic and inorganic materials in residual water represent a common effluent from industrial activities such as mining. These effluents impact the environment due its acidic properties and the presence of metals. Among the factors that influence the migration of these pollutants to subsurface the soil structure deserve further investigation. The objective of this study was determine and evaluate the transport parameters for Cd, Ni, Cr, Zn, Cu, Mn and Pb metals in an acid multispecies solution in a residual soil with an undisturbed and remoulded structure. Column tests were conducted to determine the Rd and kd. Upon comparison between the structures, the results referring to kd and Rd did not show a significant variation. A significant increase in the magnitude of values obtained from the undisturbed structure was observed, and only the values for the Cr metal did not increase.

RESUMEN: Materiales ácidos e inorgánicos en aguas residuales representan un efluente común de las actividades industriales como la minería. Estos efluentes impactan al medio ambiente debido a sus propiedades ácidas y la presencia de metales. Entre los factores que influyen en la migración de estes contaminantes bajo la superficie, la estructura del suelo merece mayor investigación. El objetivo de este estudio fue determinar los parámetros de transporte de Cd, Ni, Cr, Zn, Cu, Mn Pb en una solución ácida de múltiples especies en el suelo residual con una estructura original inalterada y outra modificada. Pruebas de columna fueron hechas para determinar Rd y kd. Para las estructuras, los resultados de kd y Rd no mostraron variación significativa. Un aumento significativo en la magnitud de los valores obtenidos para la estructura modificado fue observada, y sólo los valores para el metal Cr no aumentaron.

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