ABSTRACT:

In Brasília, capital of Brazil, a large amount of the solid waste generated by the city is disposed in an 30 years old open dump, without a minimal control. This brings on the production of a large quantity of leachate, which infiltrates through the soil and can promote soil and groundwater contamination. This fact is of concern because of the presence of important sites to be preserved beside the dumping site. This paper describes the results of a research to evaluate the capacity of natural and compacted soil to retain contaminants with time. The parameters analyzed were nitrate, ammonium, chloride, chemical oxygen demand and pH. The soil permeability to leachate was also assessed. The results showed that in spite of the good capacity of ther soil to retain contaminants, the plum is going ahead, and can cause serious risks to the environment and to the population who lives around the dump.

INTRODUCTION

For more than 30 years all the solid waste generated in Brasília is disposed in the Joquei Clube open dump, without a minimal control. This brings on the production of a large quantity of leachate, which infiltrates through the soil and can promote soil and groundwater contamination. This fact is of concern because of the presence of important sites to be preserved beside the dumping site. At the outset, the amount of solid waste which was disposed was not big, however, there was a great increment in the Brasília population, which was planned to have five hundred thousand people in the year 2000, but has today more than two millions of people living in its territory. Hence, the volume of trash generated has also increased a lot, reaching now more than 1900 ton/day. The parameters analysed were nitrate, ammonium, chloride, chemical oxygen demand and pH.

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