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Adsorption of lead (Pb) in strongly weathered tropical soil (Ribeira Valley region - Brazil)
Adsorción de plomo (Pb) en suelos tropicales fuertemente meteorizados (Región del Valle de Ribeira - Brasil)
DOI:
https://doi.org/10.15446/esrj.v23n4.77869Palabras clave:
Physic-chemical parameters, liners, residual soil, isotherms, batch test, sorption (en)parámetros fisicoquímicos, revestimientos, suelo residual, isotermas, prueba de lotes, sorción (es)
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Lateritic soils have been widely used in the construction of landfill base liners for municipal and industrial waste. On the other hand, there is little practice in the use of strongly weathered residual soils for this finality. The use of local soil for the construction of liners in order to waterproof and retain contaminants represents an alternative to control this type of contamination. Thus, the objective of this study was to determine the physical and chemical properties of a strongly weathered tropical soil (residual soil) collected in the city of Eldorado Paulista (Ribeira Valley), and to evaluate the abilityof this soil to adsorb lead (Pb). The contamination of soil and water by Pb due to inadequate mining waste disposal is common in this region. The Pb was adsorbed by the residual soil, mainly at the lowest initial concentrations. When the initial concentration of 20 mg L-1 was used, the adsorption percentage of Pb was 92.5% and when the initial concentration was 100 mg L-1, the adsorption rate was 81.7%. In addition to the retention of Pb, this soil presented the following characteristics which are favorable for using soils in the construction of liners: fine granulometry, liquid limit (LL) of 57%, plasticity index (PI) of 33%, oxidizing medium and the predominance of negative charges on the surface of the colloidal particles. Thus, it is concluded that the weathered tropical residual soil exhibits characteristics that allow it to be used as a liner in the disposal of residues containing Pb.
Los suelos lateríticos se han utilizado ampliamente en la construcción de revestimientos de basureros para residuos municipales e industriales. Por otro lado, hay poca práctica en el uso de suelos residuales fuertemente meteorizados para esta finalidad. El uso de suelo local para la construcción de revestimientos para impermeabilizar y retener contaminantes representa una alternativa para controlar este tipo de contaminación. Por lo tanto, el objetivo de este estudio fue determinar las propiedades físicas y químicas de un suelo tropical fuertemente degradado (suelo residual) recolectado en la ciudad de Eldorado Paulista (Valle de Ribeira), y evaluar la capacidad de este suelo para adsorber plomo (Pb). La contaminación del suelo y el agua por Pb debido a la eliminación inadecuada de los desechos mineros es común en esta región. El Pb fue adsorbido por el suelo residual, principalmente en las concentraciones iniciales más bajas. Cuando se utilizó la concentración inicial de 20 mg L-1, el porcentaje de adsorción de Pb fue del 92,5% y cuando la concentración inicial fue de 100 mg L-1, la tasa de adsorción fue del 81,7%. Además de la retención de Pb, este suelo presentó las siguientes características que son favorables para el uso de suelos en la construcción de revestimientos: granulometría fina, límite de líquido (LL) del 57%, índice de plasticidad (PI) del 33%, medio oxidante y El predominio de las cargas negativas en la superficie de las partículas coloidales. Por lo tanto, se concluye que el suelo residual tropical degradado presenta características que le permiten ser utilizado como revestimiento en la eliminación de residuos que contienen Pb.
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