The persistence of the soil contamination by lead and Cadmium around the city of  Santo Amaro da Purificação, Brazil

Ano:
2010
Palavras chave:
Pollutant transport; Soil contamination;
Resumo:

 

ABSTRACT Several studies since 1970 have demonstrated the severity of the contamination case in Santo Amaro, Bahia. For many years, the factory installed in the city operated without any emissions control, impacting directly the local vicinity. This study evaluates the persistence of contamination of the superficial soil around the company, relating them to expected particles concentration in the air when the company was still active. In order to do this, the emissions and dispersion of particles into the atmosphere were simulated, considering the metallurgical process data and local weather and topography parameters. The results obtained were used to plot isolines of particle concentration in the air. Radial lines were drawn from the main chimney, defining sampling points at their intersections with isolines. The results showed that the past emissions still play a very important role in the soil contamination. There is a clear persistence of the lead and cadmium concentration values and, especially in areas close to the factory, they are far above the reference limits.

Several studies since 1970 have demonstrated the severity of the contamination case in Santo Amaro, Bahia. For many years, the factory installed in the city operated without any emissions control, impacting directly the local vicinity. This study evaluates the persistence of contamination of the superficial soil around the company, relating them to expected particles concentration in the air when the company was still active. In order to do this, the emissions and dispersion of particles into the atmosphere were simulated, considering the metallurgical process data and local weather and topography parameters.

The results obtained were used to plot isolines of particle concentration in the air. Radial lines were drawn from the main chimney, defining sampling points at their intersections with isolines. The results showed that the past emissions still play a very important role in the soil contamination. There is a clear persistence of the lead and cadmium concentration values and, especially in areas close to the factory, they are far above the reference limits.