Monitoramento temporal de contaminação por chorume usando métodos geoelétricos

Abstract

This work describes a temporal monitoring of the contamination plume from the controlled landfill of Rio Claro (SP), through the resistivity method, comparing 2D Electrical Profiling dipole - dipole results, carried out in 1999 and 2008. The leachates produced on the landfill diminish the electrical resistivity of the natural ambient, characterizing the contamination. Thus, zones of low resistivity, with values smaller or same a 50 ohm.m, had been associates to the contamination for landfill wastewater. The joint interpretation of the sections of apparent resistivity allowed to identify alterations of the dimensions of the contamination plume in elapsing of the years. Governed by the main and secondary flows, the contamination plume advanced in direction to the limits west and soul of controlled landfill. Complementarily, Vertical Electrical Soundings had allowed verifying the depth and the direction of the underground water flow, and to characterize geo-electrically the lithology on which is seated the controlled landfill: predominantly sandy and silty sediments.