Remoção de metais pesados de percolado submetido à recirculação em colunas de resíduo sólido urbano

• Autor(a) principal: Gutierrez, Katia Gonçalves
• Data de Publicação: 2006
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/3547
• topic: Metais pesados; Recirculação; Resíduos sólidos urbanos; Águas residuais; Purificação; Percolação; Aterro sanitário; Heavy metals; Recirculation; Urban solid residue; Wastewaters; Purification; Percolation; Sanitary landfills; CNPQ::CIENCIAS AGRARIAS::ENGENHARIA AGRICOLA

This study was carried out to evaluate the capacity of the urban, solid and stabilized (old RSU) residue aged 20 years approximately and taken away from dump in removing the metals found in the percolate produced by urban, solid residue recently collected (new RSU). In addition, the influence of the residue layer from civil construction (RCC) on the concentration of pollutants from the effluent of the columns infilled with old RSU was also evaluated. For the production of new RSU percolate, a fiberglass reservoir with 10,000 L capacity was infilled with this material collected in Viçosa -MG. Six columns constituted by reinforced concrete piers with 3.0 m height were infilled with old RSU, that was collected in the dump of the Visconde de Rio Branco county MG. Three from these columns contained a layer of 0.30m RCC, but the other three ones had none. The percolate. The new RSU column produced percolate was enriched with heavy metals, in order to make easier the identification of the effect of the treatments. Adsorption isotherms of the metals Zn, Cd, Cu and Pb were obtained in sieved material of the old RSU agitated with percolate of the new RSU enriched with these metals. The best adjustments for Cd and Zn were obtained, by using the Tenkim model. No good adjustments of the models to the data were obtained for Pb, and the potential model showed better adjustment to the data obtained for Cu. After mass balance, it was observed that Cd and Zn showed lower concentration in the effluents of the RSU columns that had no RCC layer than in the columns containing them. A very low percent of the exchangeable sites of old RSU were occupied by the heavy metals, so indicating that their retention should occur for long recirculation period of the percolate in the RSU columns. Just as proposed, the treatment system with recirculation of the new RSU percolate in the old RSU columns showed to be efficient in removing the pollutants, therefore in accordance with the requirements of environmental agencies. Although the RCC layer had no positive effect on the removal of heavy metals, which is probably related to the poor granulometric reactivity of the material, the RCC layer showed to be important for the general improvement of the quality of the percolate recirculated in RSU columns.