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Toxicity evaluation of leachate of solid waste after biological and photocatalitical treatment

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Author(s): Juliana Graciani Carniato | Simoni Micheti Geraldo | Núbia Natália Brito Pelegrini | José Euclides Stipp Paterniani | Ronaldo Teixeira Pelegrini

Journal: Engenharia Ambiental : Pesquisa e Tecnologia
ISSN 1678-2178

Volume: 4;
Issue: 2;
Start page: 92;
Date: 2007;
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Keywords: Toxicity | Waste leachate | Sanitary landfill.

ABSTRACT
The final disposition of urban solid wastes is a practice that still causes serious environmental impacts generating several pollutant subproducts, such as the landfill leachate. The toxicity tests are used in the pollution control with the scope of finding the permissive concentrations of a chemical agent for the development survival of particular alive organisms. This work aims the toxicity evaluation study in leachate samples of in natura solid wastes, after biological treatment through slow filtration and after heterogeneous photocatalitical treatment using TiO2/UV. The ecotoxicological evaluation was executed through accute and chronical toxicity tests using as test organisms: Daphnias similis e Eruca sativa (arugula). On average, the in natura, filtered and photocatalized leachate dilution that kills or inhibits around 50% (EC50) of the Daphnias similes is 6%, 7% and 6% respectively. On average of non observable effect concentration (NOEC) of in natura, filtered and photocatalized leachate for arugula is 2%, 1% and 4% respectively; and on average of observable effect concentration (OEC) is 5%, 3% and 6% respectively. The toxicity tests showed a great usage in the monitoring and management of waste leachate so that presenting the high toxicity of this effluent for aquatic environment.
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