Slow sand filter in the treatment of leachate of the sanitary landfill of Limeira -SP / Sistema de filtração lenta no tratamento de percolado do aterro sanitario de Limeira-SP

AUTOR(ES)

Nubia Natalia de Brito Pelegrini

DATA DE PUBLICAÇÃO

2006

RESUMO

The final disposition of solids residues is a practice that still brings serious impacts to the environment. In sanitary landfill, the residues goes through physical, chemical and biological decomposition processes, generating into a gas phase (mainly composed by CH4 and CO2) and a liquid phase known as leachate. The waste leachate is a liquid with high pollutant potential. The conventional methods used in the treatment this residue have discarded him with intense coloration and high toxicity. This work had as objective implant in pilot scale a system of slow sand filtration preceded of a pré-filtration, only in non-woven synthetic fabrics, for the waste leachate treatment in natura, originating from the sanitary landfill of the city of Limeira-SP. The slow sand filter is constituted by a plastic cylindrical tank, sands and non-woven synthetic fabrics. The filtration rate adopted during the experiments it was of 3 m3/m2.dia. The treatment system in study presented considerable reductions of some values of environmental parameters control indicating the possibility of the use of the slow filtration for remediação of wastewaters. The main obtained reductions were 40% of turbidity, 21% of color, 35% of hardness, 35% of total organic carbon (TOC) and reductions considerably of heavy metals (60% of cadmium, 30% of lead, 25% of cupper and 30% of chrome). For the reuse of the treated leachate in agricultural activities are necessary larger reductions of some values of analytic parameters through the complementation with other treatment technologies. eywords: Landfill Leachate, Sanitary Landfill, Slow Sand Filtration, Reuse

ASSUNTO(S)

landfill leachate agua - purificação - filtração agua na agricultura aguas residuais - eliminação filtros e filtração agua - poluição aterro sanitario residuos como fertilizantes reuse agua - reutilização agua - purificação - tratamento biologico slow sand filtration sanitary landfill

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