Tratabilidade de solos tropicais contaminados por resíduos da indústria de revestimentos cerâmicos. / Treatability of tropical soils contaminated by solid wastes from ceramics covergin industry.

AUTOR(ES)

Luciana Pena de Oliveira

DATA DE PUBLICAÇÃO

2006

RESUMO

The Ceramic Pole of Santa Gertrudes, located in the region of Rio Claro, in the State of São Paulo, is the largest of the gender in the country, counting with more than 40 industrial units of the section of floors and coverings and responsible for more of the half of the national production. The area of studies, denominated Region of the Lakes of Santa Gertrudes, locates at the Córrego da Fazenda Itaqui river basin, sub-affluent of the River Corumbataí, spring used for the public provisioning of approximately 650 thousand inhabitants. The lakes are not natural formations, but resultants of the flood of old diggings of clay extraction, for the blooming of Formation Corumbatai?s aquifer. In these diggings were deposited solid wastes from the line of enamels and thrown liquid effluents of the productive process of the ceramic, containing high concentrations of metals, mainly of boron (B), cadmium (Cd), lead (Pb) e zinc (Zn). This research work aimed to offer an alternative of remediation of the polluted soil, through the study of three leaching processes of metals, produced by washing of soil with concentrated sulfuric acid and solutions of hydrogen peroxide 30% and 0,1 M hydrochloric acid. The obtained results identified that the washing with concentrated sulphuric acid caused a 50% reduction of Zn contents and the washing with 0,1M hydrochloric acid solution reduced Pb and Zn contents in 15% and 10%, respectively. The Zn contents remaining in the soil processed with concentrated sulphuric acid were 117 mg/kg and the Pb and Zn contents remaining in the soil processed with 0,1M hydrochloric acid solution were 806 mgPb/kg and 213 mgZn/kg, values which are lower than the intervention values established by São Paulo?s environmental control agency.

ASSUNTO(S)

soil treatment indústria da cerâmica e argila metals tratamento do solo ceramic and clay industry metais

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