Avaliação da remoção de microcistina-lr por adsorção em bagaço de cana de açúcar e em carvão ativado
The risk of the occurrence of cyanobacteria with the consequent release of cyanotoxins at levels above the established in the ordinance MS 2914/2011 1 μg.L-1 it is a problem the supply of water sources and water treatment plants throughout Brazil. Currently it is known that the presence of cyanobact...
| Autor principal: | Nascimento, Priscila Tiemi Higuti do |
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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/1/9679 |
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| Resumo: |
The risk of the occurrence of cyanobacteria with the consequent release of cyanotoxins at levels above the established in the ordinance MS 2914/2011 1 μg.L-1 it is a problem the supply of water sources and water treatment plants throughout Brazil. Currently it is known that the presence of cyanobacteria occurs not only in polluted or eutrophic waters. The conventional public system of water treatment is responsible for removal of cyanobacteria and cyanotoxins. However, such treatment is not satisfactory in the case of cyanotoxin is in dissolved form. Regarding the possibility of using the sugarcane bagasse in order to reduce costs and viable conditions of implementation of the process of removing toxins in the water, this study aimed to investigate the use of sugarcane bagasse in natura for adsorption of microcystin-LR in comparison with the activated carbon. Adsorption experiments were carried out at 25 °C with three initial concentrations of microcystin-LR: 2.36, 3.33, 3.83 μg.L-1 total time of 10 hours. It was also performed the physicochemical characterization of adsorbents used in adsorption experiments to remove microcystin- LR. The performance was evaluated by the adsorption capacity and adsorption by the toxin removal efficiency. The best removal rate was 65% for the activated carbon to the concentration of 2.36 μg.L-1 microcystin. The results for sugarcane bagasse in natura not reached the microcystin concentration lower limit of 1.0 μg.L-1 established in the MS 2914/2011. The results for sugarcane bagasse in natura not reached the microcystin concentration lower limit of 1.0 μg.L-1 established in the MS 2914/2011. It was also found that the performance of sugarcane bagasse was best represented by the model Freundlich isotherm and the activated carbon by model Langmuir isotherm. It can be concluded that it is not possible to use the sugarcane bagasse in natura for removal of microcystin-LR in water treatment. |
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