Remoção do fármaco sulfametoxazol por eletrooxidação
The increasing use of drugs worldwide in recent years raises concerns over the action and effects of these chemicals on the environment and on living organisms. These compounds are recalcitrant to natural degradation and can cause major problems to the aquatic environment even in the small concentra...
| Autor principal: | Santos, Rodrigo Becegato de Sousa dos |
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| Formato: | Trabalho de Conclusão de Curso (Graduação) |
| Idioma: | Português |
| Publicado em: |
Universidade Tecnológica Federal do Paraná
2022
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.utfpr.edu.br/jspui/handle/1/27773 |
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| Resumo: |
The increasing use of drugs worldwide in recent years raises concerns over the action and effects of these chemicals on the environment and on living organisms. These compounds are recalcitrant to natural degradation and can cause major problems to the aquatic environment even in the small concentrations they are usually present. Thus, new technologies to improve the removal of pharmaceuticals in sewage and water treatment plants are needed. This study presents the assessment of the removal of sulfamethoxazole (SMX) by electrooxidation in a synthetic medium that mimics sewage wastewaters using the dimensionally stable anode (DSA, Ru0.3Ti0.7O2). The electrooxidation treatment were carried out in two different electrochemical reactors, one consisting of a single compartment unit cell and the other consisting of a two-compartment cell separated by an anion exchange membrane. The experiments conducted in the latter provided the identification of the predominant species acting as mediator for the indirect electrooxidation of the target pollutant as a function of the current density. The SMX removal was evaluated by UV-Vis spectroscopy and chemical oxygen demand (COD) analyses were performed to estimate the degree of SMX electrochemical degradation. However, the latter method proved to be inadequate when applied to samples from electrochemical treatment, giving unreliable results. The results showed a dismal performance of the electrooxidation method for the SMX removal, reaching only a maximum 25% under the operation conditions investigated. This is attributable to the low chloride content in the sewage like medium, around 4.6 mM. The costs of the electrochemical treatment for SMX removal were assessed by scaling up the results obtained in the bench scale experiments. The estimated costs turned out to be excessively high compared to the conventional sewage wastewater treatment,namely 6.8, 0.89 and 0.93 R$/g for current densities of 20, 40 and 50 mA/cm² respectively, which is connected to the modest removal efficiency observed in the medium with sewage wastewater characteristics. |
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