Estudo experimental do comportamento de fenóis em aquífero livre da área da Albras - Barcarena/Pa

Abstract

This work elaborated a computational hydrogeologic model to evaluate the behavior of Phenols in the unconfinaded aquifer in the area of influences direct of the complex Albras/Alunorte. For that, had been considered the coefficients of sorption of Phenols, gotten experimentally, as well as the hydrodynamic parameters, the speed and the standard of flow of the considered aquifer. The sorption assays had been carried through in the samples of Complex (1A and 1B), for the initial concentrations of 25 and 50 mg/L Phenol in conditions of pH 5 and Ph 8, shaking time of 6, 24 and 48 hours. For 25 mg/L initial concentration and shaking time of 6, 24 and 48 the sorved phenol content had been higher for values of pH 5. For the initial concentration of 50 mg/L phenol, had not been observed significant differences in sorved phenol content for the two studied levels of soil, independently of the conditions of pH and shaking. The desorption assays had shown that for the 1A and 1B samples, originally mixed to the solution of 25 mg/L of phenols, the ressolubilized contents had been very low, next to 0,01 mg/L. In both pH 5 and pH 8. For 50 mg/L of solution, the ressolubilized phenol content had been also low. However in pH 8 the concentrations had been next to 0,02 mg/L, about two times those gotten for pH 5. The obtained desoption values showed that phenol sorption is practically irreversible. The modeling results of unconfined aquifer made through the 1Dcontr program for the unsaturated zone had shown that how much higher the retardation factor, minor is the final phenol concentration after flow for unsaturated zone, and when bigger the initial amount of phenols infiltrated in the surface higher is the final phenol concentration in the saturated zone interface. The result of the flow model showed that the main flow lines come out from ALBRAS and ALUNORTE toward two discharge areas, one in the East and another in the West forming with this a watershed through plant. The transport of phenol mass showed for scene 1 (that considered the real characteristics of degradation and sorption of phenol) showed a discrete evolution of the plume with time. For the scene 2(which considered phenol as a conservative substance) the plume evolution was faster with the time in relation to scene 1.