Environmental assessment of an uncontrolled sanitary landfill,Pocos de Caldas,Brazil |
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Authors: | Lázaro Valentin Zuquette Janaina Barrios Palma Osni José Pejon |
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Affiliation: | 1. Departamento de Geotecnia, Escola de Engenharia de S?o Carlos, Av. Trabalhador S?o-Carlense, 400 13, 566 - 590, S?o Carlos, Brazil
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Abstract: | There are more than 20,000 uncontrolled sanitary landfill areas in Brazil. The paper reports an integrated study undertaken
to develop an environmental assessment of the uncontrolled sanitary landfill area of the city of Po?os de Caldas, State of
Minas Gerais, Brazil. A number of remedial alternatives were evaluated. The USGS modular 3D finite difference groundwater
flow model (Modflow) and Modular 3D Finite Difference Mass Transport Model (MT3D) software were used to simulate groundwater
flow and contaminant transport modelling, as well as to predict changes due to the proposed remediation measures. The remedial
alternatives considered for normal conditions from 20 to 40 year periods were waste removal, vertical cut-off barriers, extraction
wells and top capping. The results indicated that extraction wells and waste removal are the best alternatives because they
significantly reduce both the extension and levels of the contamination plume even after 5 years. The extraction well proved
a less expensive remedial alternative than waste removal.
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Keywords: | Uncontrolled sanitary landfills Groundwater pollution Numerical simulations Remediation measures Brazil |
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