Investigação geoambiental em áreas de disposição de resíduos sólidos urbanos utilizando a tecnologia do piezocone. / Geoenvironmental site investigation in waste disposal sites using the piezocone technology.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

The major purpose of this dissertation is to study the applicability of the piezocone technology for geoenvironmental site investigation of tropical soils. Two waste disposal sites were investigated: a deactivated dumpsite in Ribeirão Preto and a sanitary landfill in Bauru, in São Paulo State, Brazil. Other in situ and laboratory tests were carried out in these two areas for a better understanding of the leacheate plume and of the results gathered with piezocone tests. The piezocone technology presented limitations to investigate Ribeirão Preto site, since groundwater level is deeper than the impenetrable to the cone. For reason, it was impossible to estimate permeability and no water samples using the direct-push technology were obtained. Geophysical tests carried out at the two studied sites allowed to detect and delineate the shape of leachate plume. They were fundamental to guide and locate the piezocone tests, soil and water sampling and monitoring wells. The resistivity piezocone tests (RCPTU) carried out in Bauru site showed that the resistivity values are very affected by degree of saturation, genesis, fabric and clay mineral type. Geophysical tests results, soil and water samples collected by direct-push technology and by monitoring wells supported the interpretation of RCPTU tests. These tests were able to identify polluted zones. Preliminary laboratory tests were carried out to access retention of Ni, Zn, Cd and Pb by the soil from Bauru site. The results of leaching and batch equilibrium tests indicated that pollution around this site is taking place slowly, emphasizing the importance to continue monitoring groundwater.

ASSUNTO(S)

geofísica resíduos urbanos piezocone (cptu) tropical soils solid wastes sanitary landfill (contamination) urban wastes aterro sanitário (contaminação) resíduos sólidos leaching test bath equilibrium test geophysics solos tropicais iezocone (cptu) geotecnia ambiental (rcptu) ensaio de adsorção em lote (rcptu) ensaio de coluna environmental geotechnics monitoring wells poços de monitoramento

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