This study aimed at the investigation of genotoxic effects of swine effluents from different stages of a treatment system for swine wastes through bioassay of stamen hairs and micronuclei in Tradescantia (clone BNL 4430). No significant differences (p≥0.05) regarding the genic mutations were found in the bioassay of stamen hairs, independently of the effluent analysed. For the genotoxicity test with micronuclei, the plants exposed to raw wastes, to sludge, and to effluent of the biodigester have presented higher rates of chromosomal damages (micronuclei), with significant differences in relation to the control group and other effluent of the waste treatment system (p≤0.05). The association between the chemical parameters and the genotoxicity data have shown that the variables COD and TKN have presented significant correlation (p≤0.05) with the number of mutagenic events in the tetrads.
Estudo da degradação de compostos fenólicos presente em águas residuárias de postos de combustíveis utilizando fungos filamentosos (Aspergillus Flavus) ResumoDiversos compostos são sintetizados e produzidos industrialmente, onde, em sua maioria, são dificilmente degradados ou reciclados na forma em que se encontram. Grande parcela do processo de contaminação pode ser atribuída aos compostos fenólicos, encontrados nas mais diversas concentrações em águas residuárias de postos de combustíveis. Neste estudo, buscou-se isolar e identificar fungos filamentosos com capacidade de degradação de compostos fenólicos e avaliar, através da utilização de técnicas de planejamento experimental, os fatores: temperatura e pH no rendimento da degradação dos compostos fenólicos. A linhagem do fungo isolada foi a de Asperillus flavus. Através dos resultados obtidos verificou-se que a linhagem de fungos estudada é pouco afetada por variações no pH e apresentou melhor desempenho na temperatura de 25°C e pH 8, com degradação de 6,7 ppm de fenol.Palavras-chave: Fungos filamentosos, Compostos fenólicos, Tratamento de efluentes, Planejamento experimental.. AbstractSeveral compounds are synthesized and industrially produced, where in most cases, are hardly degraded or recycled in the way they are. A large portion of contamination process can be attributed to phenolic compounds found with different concentrations in wastewater from gas stations. In this study, we attempted to isolate and identify filamentous fungi capable of phenolic compounds degradation and evaluate, using experimental design techniques, the effects of temperature and pH on degradation yield of phenolic compounds. Aspergillus flavus fungi lineage was isolated in this study. Results showed that the fungi lineage was little affected by changes in pH and showed better performance at 25°C and pH 8, when 6.7 ppm of phenol was degraded.
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