Aplicação de tecnologias eletroquímicas (oxidação via radicais hidroxila, oxidação mediada via cloro ativo e eletrocoagulação) para o tratamento de efluentes reais ou sintéticos
In this work the degradation of real and synthetic wastewater was studied using electrochemical processes such as oxidation via hydroxyl radicals, mediated oxidation via active chlorine and electrocoagulation. The real effluent used was collected in the decanter tank of the Federal University of...
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| Формат: | doctoralThesis |
| Язык: | por |
| Опубликовано: |
Universidade Federal do Rio Grande do Norte
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| Online-ссылка: | https://repositorio.ufrn.br/jspui/handle/123456789/19803 |
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| Итог: | In this work the degradation of real and synthetic wastewater was studied using
electrochemical processes such as oxidation via hydroxyl radicals, mediated oxidation
via active chlorine and electrocoagulation. The real effluent used was collected in the
decanter tank of the Federal University of Rio Grande do Norte (ETE-UFRN) of
Effluent Treatment Plant and the other a textile effluent dye Ácido Blue 113 (AB 113)
was synthesized in the laboratory. In the electrochemical process, the effects of anode
material, current density, the presence and concentration of chloride as well as the
active chlorine species on site generated were evaluated. Electrodes of different
compositions, Ti/Pt, Ti/Ru0,3Ti0,7O2, BDD, Pb/PbO2 and Ti/TiO2-nanotubes/PbO2 were
used as anodes. These electrodes were subjected to electroanalytical analysis with the
goal of checking how happen the anodic and cathodic processes across the
concentrations of NaCl and supporting electrolyte used. The potential of oxygen
evolution reaction were also checked. The effect of active chlorine species formed
under the process efficiency was evaluated by removing the organic matter in the
effluent-ETE UFRN. The wastewater treatment ETE-UFRN using Ti/Pt, DDB and
Ti/Ru0,3Ti0,7O2 electrodes was evaluated, obtaining good performances. The
electrochemical degradation of effluent-UFRN was able to promote the reduction of the
concentration of TOC and COD in all tested anodes. However, Ti/Ru0,3Ti0,7O2 showed a
considerable degradation due to active chlorine species generated on site. The results
obtained from the electrochemical process in the presence of chloride were more
satisfactory than those obtained in the absence. The addition of 0.021 M NaCl resulted
in a faster removal of organic matter. Secondly, was prepared and characterized the
electrode Ti/TiO2-nanotubes/PbO2 according to what the literature reports, however
their preparation was to disk (10 cm diameter) with surface area and higher than that
described by the same authors, aiming at application to textile effluent AB 113 dye.
SEM images were taken to observe the growth of TiO2 nanotubes and confirm the
electrodeposition of PbO2. Atomic Force Microscope was also used to confirm the
formation of these nanotubes. Furthermore, was tested and found a high electrochemical
stability of the electrode Ti/TiO2-nanotubes/PbO2 for applications such as long-term
indicating a good electrocatalytic material. The electrochemical oxidation of AB 113
using Ti/Pt, Pb/PbO2 and Ti/TiO2-nanotubes/PbO2 and Al/Al (electrocoagulation) was
also studied. However, the best color removal and COD decay were obtained when
Ti/TiO2-nanotubes/PbO2 was used as the anode, removing up to 98% of color and
92,5% of COD decay. Analysis of GC/MS were performed in order to identify possible
intermediates formed in the degradation of AB 113. |
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