Avaliação agroambiental do uso de lixiviado de aterro sanitário na produção de mudas de Senna macranthera (DC. Ex Collad) H.S. Irwin e Barneby

• Autor(a) principal: Franco, Heider Alves
• Data de Publicação: 2018
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/14240
• topic: Effluent; Environmental impact; Ecotoxicology; Vegetable production; Senna macranthera; Efluente; Impacto Ambiental; Ecotoxicologia; Produção Vegetal; Senna macranthera; Meio ambiente - Contaminação; Impacto ambiental; Toxicologia ambiental; Lixiviados; CNPQ::ENGENHARIAS::ENGENHARIA SANITARIA

The population and economic growth are the agents of greatestexploitation of natural resources. Associated with this is the increaseexponential growth in solid waste generation, which is also influenced by the scheduledobsolescence. Regarding the final destination, the use of the landfill is considered to be environmentallycorrect. However, presents its environmental liabilities, the generation of leachate, liquid from rainwaterpercolation and residue moisture. This presentes polluting potential due to its variable constitution. Therefore, the reuse of landfill leachate in forestexploitation of water resources, strengthen the activity and contribute to the with currentlegislation. The present study evaluated the agrienvironmental aspects of the application of landfill leachate in irrigation production of Senna macranthera seedlings, as well as, the characterization physicochemical and ecotoxicological, with different test organisms, of leachate landfill.The physicochemical effects of the application of on substrates for seedling production via leaching. From this, ecotoxicological analyzes was carried out to define the potential of environmental impact of the effluent generated in the columns. It was evaluated also the effect of landfill leachate doses on the characteristics of morphologicalchanges of Senna macranthera. The deleterious effect of landfill leachate in a study on the germination of seed of the species in different substrates with high discrepancy in the ecotoxicological characterization of landfill leachate. For the Petri dish, inhibition of germination was observed in 50% of the seeds, as well as drastic reduction of root length with the use of of a 6.25% leachate dose. However, in the culture substrate assay this occurred in the 50% treatment. Within the characterization of the toxicity of landfill leachate, on Brachydanio rerio, it is noted that the lethal concentration capable of causing 50% mortality was identified in 2.24% of leachate. In the evaluation of the direct toxicity on the culture medium, important differences was identified for the median concentration capable of leakage in test organisms depending on the type of substrate. It is stated that doses higher than 90%, 12.5% and 3.125%, used in the substrates, commercial, conventional and organic respectively, was responsible for make the environment toxic. In the leachingcolumn tests, the application of landfill leachate promotedphysico-chemical substrates, but these were not significant in order to make them unsuitable for cultivation of plant species. Note changes in leachate generated after the columns, however, it was shown to be less toxic to organisms than the leachate in natura with its dilutions. It was not observed the significant effect of the doses studied on the characteristicsmorphological of the species. The view point agronomic and environmental, one can suggest the use of landfill leachate at a dose of 12.5%, in the irrigation of seedlings of Senna macranthera, serving this activity as a reuse for the pollutant