Sementes de hortaliças aplicadas na fitotoxicidade de lixiviado bruto e tratado por foto-fenton solar

Abstract

One of the biggest problems in the management of municipal solid waste in landfills is the treatment of leachate, since its characteristics give it a high toxic and polluting potential. Toxicity is a parameter of considerable importance when it comes to the discharge of effluents, since organisms tend to react differently in the presence of the various compounds that form these effluents. Thus, the objective of this work is to evaluate the phytotoxicity of the crude and post-treated leachate by photo-Fenton and solar photolysis of the Municipal Landfill of João Pessoa-PB, as well as to verify the efficiency of the treatment in reducing the following environmental parameters: Color, COD and Aromaticity. The species were chosen according to the sensitivity and their germination potential, being: Lactuca sativa (lettuce) and Brassica oleracea L. var. capitata (cabbage). Phytotoxicity analysis was done by germination and relative growth inhibition rates of the seedlings and EC50 (concentration that causes lethal effect in 50% of the population tested). In relation to the reduction of leachate toxicity after solar photo-Fenton treatment, it was possible to verify that the tests indicated an average reduction of 74% of toxicity, whereas in the acidified-photolysis-alkalized sample, a reduction in the phytotoxicity of only 12%. In addition, a significant improvement of Color, COD and Aromaticity was also observed after the photo-Fenton processes. However, there was a worsening in the parameters Cor and COD with respect to the photolysis of the acidified / alkalized sample.