Avaliação da degradação do corante Preto Reativo 5 por processos Fenton e foto-Fenton
In recent decades there has been a significant growth of the textile industry and consequently the increase in water consumption and effluent generation with highest color. Conventional treatments of wastewater containing textile dyes are not always efficient when related to the degradation and mini...
| Autor principal: | Carvalho, Vanessa da Silva |
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| Formato: | Trabalho de Conclusão de Curso (Graduação) |
| Idioma: | Português |
| Publicado em: |
Universidade Tecnológica Federal do Paraná
2020
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.utfpr.edu.br/jspui/handle/1/9593 |
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| Resumo: |
In recent decades there has been a significant growth of the textile industry and consequently the increase in water consumption and effluent generation with highest color. Conventional treatments of wastewater containing textile dyes are not always efficient when related to the degradation and minimizing the toxicity of the compound, requiring the development of new techniques to suply this fault. This way, the Advanced Oxidation Processes (AOP), such as photoFenton, present as an efficient alternative technique. These processes use the reaction of ferrous ions with hydrogen peroxide to form the hydroxyl radical, which is highly reactive, it is able to degrade persistent organic compounds. The photo-Fenton process further receives the incorporation of ultraviolet, generating a photocatalytic redox cycle iron, leading to an increase in the production of hydroxyl radicals and, consequently, the efficiency of degradation's speed. Treatment of dye Reactive Black 5 by these two processes, revealed efficiency of both systems, and the photo-Fenton what better results, with a reduction of the spectral area 93.53%, concentration of total phenolics in 77,85% and also higher mineralization compound with a percentage of 96.8%. The highest level of toxicity was observed by treating photo-Fenton after 40 minutes treatment in which the tests on Daphnia magna EC50 indicate a transition from 32.56 mg L-1 to 19.24 mg L-1 . However, at the end of treatment (140 min), ecotoxicity declined. The Fenton process was reduced ecotoxicity at all times of treatment. Bioassays performed with Lactuca sativa were consistent with the previous test, which was also observed higher toxicity after 4 0 minutes of photo-Fenton process. At this point, it was possible to observe an inhibition in growth of the radicle in which the ICR (Relative Growth Index) went from 0.9 to 0.4. After 140 minutes of treatment the ICRs of L. sativa returned to 0.9, indicating no significant effect of the sample on the seed. The results obtained in this work highlighted the importance of ecotoxicological monitoring during treatment, to check not only the degradation of recalcitrant compound, but also the reduction of its toxicity. |
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