Heavy metal behavior associated with soil cover used in the Bandeirantes Sanitary landfill, São Paulo District

HEAVY METAL BEHAVIOR ASSOCIATED WITH SOIL COVER USED IN THE BANDEIRANTES SANITARY LANDFILL, SÃO PAULO DISTRICT

SIBELE EZAKI ¹AND RAPHAEL HYPOLITO ²

¹Programa de Graduação, Instituto de Geociências – USP, São Paulo, SP.

²Departamento de Geologia Sedimentar e Ambiental, Instituto de Geociências – USP, São Paulo, SP.

Presented by ANTONIO C. ROCHA-CAMPOS

Soil used to cover compacted solid waste at sanitary landfills plays an important role in attenuating contamination by interfering in leachate composition and incorporating organic and inorganic substances. In order to investigate the behavior of metallic ions associated with the soil cover of the Bandeirantes Sanitary Landfill, Municipality of São Paulo, Brazil, we propose to assess the mobility and fixation mechanisms by simulating environmental conditions of sanitary "cells'' in vitro.

The experiment will consist of glass columns, in which organic and metallic phases of an "artificial waste'' will be placed upon a bed of soil and coarse sand layers, both supported on filter. Above this waste layer, a known mass of soil will be added and compacted keeping the proportions used in real sanitary landfill. Rain water or artificial rain will be allowed to percolate through the column at a rate based on known monthly precipitation. The control experiment will use soil only, taken from an intact soil profile near the landfill.

Other experiments will also reproduce the conditions equal to those in the Bandeirantes Landfill cell, but will inject rainwater and also known concentrations of heavy metals (Zn, Cr, Pb). Soil chemistry will be analyzed as well as the chemical and physical-chemical properties of the leachates such as pH, Eh, temperature, humidity and DO. These parameters will be measured, as they reflect microbiological activity during aerobic and anaerobic decomposition within the landfill; the metallic ion behavior will reveal characteristics of both biochemical and physico-chemical processes. — (December 14, 2001).

Publication Dates

• Publication in this collection
  09 Oct 2002
• Date of issue
  Sept 2002