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Atualmente, a producao e armazenamento de residuos solidos urbanos (RSU), tem gerado uma gama de discussoes acerca de aspectos ligados a veiculacao de doencas e danos ambientais, principalmente, se sua disposicao for realizada de maneira inadequada, pois isto pode acarretar a infiltracao do lixiviado no solo, causando a sua contaminacao e, possivelmente, do lencol freatico e cursos d’agua. Na cidade de Ponta Grossa (PR), a coleta dos RSU teve inicio em 1969 e a disposicao final desses residuos era em um lixao, que foi transformado em aterro controlado no ano de 2001. Este estudo tem por objetivo, avaliar as caracteristicas de alguns pontos da camada superficial do solo localizado na base do agora aterro controlado do Botuquara, para verificar possiveis tendencias a contaminacao da area. Foram determinados pH, carbono orgânico, materia orgânica, nitrogenio total, relacao C:N, capacidade de troca cationica, saturacao de bases e teores de areia, argila e silte, alem da verificacao das concentracoes de Ag, Cr, Cd, Cu Fe, Mn, Ni, Pb e Zn na forma de metais biodisponiveis e pseudototais. Os resultados mostraram que o solo apresenta altas concentracoes de Cr e Pb biodisponiveis e Pb, Cu e Ag pseudototais. Ja a saturacao dos coloides, indica que o solo atingiu sua capacidade maxima de retencao. Abstract Currently, the production and storage of urban solid residues (USR) have generated a discussion range about aspects close to the diseases propagation and environment damage especially in the boundaries in which it is done improperly. Since, this may lead to the leached into the soil, causing its contamination as well as the groundwater contamination going deep in the groundwater. In Ponta Grossa, a city in the state of Parana the final disposition place of the USR started out in 1969 and the final disposition of such waste was in a big dump, which become into a controlled landfill in 2001. The aim in this paper was to evaluate the characteristics of same earth points of the surface soil layer at the base of the now Botuquara’s controlled landfill earthwork. It was checked in this area the possible trends of its contamination. It were accomplishing analyses of pH, organic carbon, organic matter, total nitrogen, C:N relation, cation exchange capacity, bases saturation and sand contents, clay and silt to the earth. It was also checked the concentration of Ag, Cr, Cd, Cu, Fe, Mn, Ni, Pb and Zn biodegradable metals and pseudo-total into the land. As a result it was show high concentration of Cr and Pb biodegradable and Pb, Cu and Ag pseudo-total. Already saturation of colloids, indicates that the soil has reached its maximum capacity of retentions.

ambiência

Estudo químico de alguns pontos do solo superficial do aterro controlado do Botuquara / Chemestry study of some points of soil surface the Botuquara controlled garbage