Remoção de metais pesados do percolado de aterro sanitário usando resíduos sólidos urbanos e de construção civil

• Autor(a) principal: Moreira, Débora Astoni
• Data de Publicação: 2008
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/646
• topic: Metais pesado; Adsorção; Heavy metals; Adsorption; CNPQ::CIENCIAS AGRARIAS::ENGENHARIA AGRICOLA::ENGENHARIA DE AGUA E SOLO

The high toxicity and the cumulative nature of the heavy metals have been the reason of great concern worldwide, providing a significant increase of works that objectify to develop technologies to remove of these potentially harmful substances to the environment. With the objective of studying the heavy metals removal capacity in percolate produced by newly collected solid residue waste were used stabilized urban solid and building demolition (BD) waste, analyses of metals adsorption and of mobility in leaching columns were realized. 15-year (SRU_Old) and 8 year stabilized (SRU_Mature) urban solid waste, BD in three granulation fractions (0.5 to 1; 2 to 4 and 4 to 7.5 mm), and percolate with average concentration of 0.146 mg L-1 Cu, 0.046 mg L-1 Cd, 17.2 mg L-1 Zn and 0.135 mg L-1 of Pb were used and the values increase 5 and 25 fold. The results showed: (a) the best adjustment of the isothermal of adsorption were obtained using Langmuir's Model; (b) the maximum adsorption capacity for SRU_Old and BD, in the 2 4 mm granulation fractions and 4 7.5 mm granulation factors, presented the following sequence: Zn>Pb>Cu>Cd; but for SRU-Mature and BD, in the 0.5 1 mm granulation, the sequence was Zn>Cu>Pb>Cd; (c) in the studied residues (SRU-Old, SRU-Mature and BD), it was obtained retardation factors, that present the following sequence: Pb>Cu>Zn>Cd; (d) SRU_Old presented metal retention larger capacity of the landfill percolate, followed by the SRU_Mature and BD 0.5 1 mm, 2 4 mm, and 4 7.5 mm; (f) the higher SRU_Old capacity in retain the heavy metal than SRU_Mature indicates to be recommendable the recirculation of the percolated by newly collected solid residue in older cells in the landfill.