SORPTION AND LEACHING OF HEAVY METALS IN THE ANAEROBIC TREATMENT PROCESS OF ORGANIC SOLID WASTE

摘要

The behavior of eight different heavy metals present in municipal solid waste "in natura" when submitted to anaerobic biostabilization process has been studied in this work. The results of this work reveal what would happen in a reception system of municipal solid waste when its composition contains a significant gravimetric percentile of metallic material. When fermentable organic matter present in municipal solid waste is submitted to biostabilization process, the metallic material undergoes redox process and it releases the metallic species to the medium, a part of that is retained in the waste mass and the other part is carried by the leached, thus being related to environmental problems. The results produced by this research showed that approximately 45 wt% of the influent heavy metals was retained in the mass of the biostabilized municipal solid waste. Thus, demonstrating that, regarding municipal solid waste treatment, the sorption study results can bring a significant contribution to the area of the treatment of solid waste such as the municipal solid waste.