Obtenção de coeficientes de dispersividade de solos na cidade de Fortaleza a partir da retroanálise dos resultados obtidos em ensaios laboratoriais

Abstract

Among the various problems related to contamination of the environment highlights the contamination of soils and groundwater by agents derived from petroleum. The analysis of the contamination process is usually made by the numerical simulation of the advance of the contamination plume in the soil. Among the main difficulties for this analysis can be cited the obtainment of the coefficients of longitudinal and transverse dispersion. This work aims at defining a methodology for obtaining the soil dispersivity coefficients of Fortaleza from metanalysis of laboratory test results. To establish the methodology for defining the dispersion coefficients was developed a device that simulated in the laboratory one-dimensional transport of contaminants in an undisturbed soil sample. The contaminated soil samples were then collected and subjected to chemical analysis to determine the concentration of BTX (benzene, toluene and xylene). Then, the contamination of the sample in the laboratory was metanalysis by numerical simulation to obtain the coefficients of longitudinal and transverse dispersivity. According to the methodology used for the final values of longitudinal dispersivity coefficients were 0.055 and 0.032 m for toluene and xylene, respectively.