Aplicação e comparação de soluções semi-analíticas para modelagem de ensaios de sorção e difusão pura

Abstract

The implementation of the National Solid Waste Policy (Law No. 12.305, of August 2, 2010) was a milestone for the disposal and treatment of solid waste in the country. The contamination due to the misuse of the areas and neglect of the disposal of urban solid waste reaches vital natural resources and systems for human existence, such as soil, groundwater, and air. It is therefore essential to understand the mechanisms involved in the transport of contaminants and thus to apply the best geotechnical devices to mitigate and/or remediate impacts. This paper presents the analysis and comparison of mathematical models applied to the results of the experiments carried out by Ritter, in 1998, in her PhD thesis, to determine the transport of the main inorganic cations found in the leachate of the Gramacho landfill (K+, Cl-, Na+ and NH4+), by the chemical diffusion and sorption mechanisms. In order to understand these mechanisms, two semi-analytical solutions were used to trace the behavior of these contaminants along the soil sample used by Ritter, in 1998. The results show that the effective diffusion coefficients and adjustments determined by the CCE solution are within the ranges indicated in the literature. In addition, the comparison between the two modeling solutions revealed adjustments pertinent to the results found in the laboratory.