Avaliação dos coeficientes de transferência de massa e hidrodinâmica de diferentes geometrias de células eletroquímicas para o tratamento de BTX
The oil and gas production processes generate large volumes of waste with high toxicity. In this industry, produced water is the most produced liquid volume with great polluting capacity. Among the organic contaminants, the aromatics, mainly BTEX, present a major risk to the environment and peopl...
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| פורמט: | Dissertação |
| שפה: | por |
| יצא לאור: |
Universidade Federal do Rio Grande do Norte
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| גישה מקוונת: | https://repositorio.ufrn.br/jspui/handle/123456789/20336 |
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| סיכום: | The oil and gas production processes generate large volumes of waste with high
toxicity. In this industry, produced water is the most produced liquid volume with great
polluting capacity. Among the organic contaminants, the aromatics, mainly BTEX, present a
major risk to the environment and people's health. Over the past years, many studies have
been conducted under the electrooxidation of aromatic compounds, showing that the
electrochemical degradation is efficient for these substances, even more importantly, the
process involves only the use of electrons as reactants. However, the design of the
electrochemical reactor, hydrodynamics and mass transfer coefficients are critical parameters
on the efficiency of the electrochemical process. In this context, the objective of this study
was to investigate geometries of electrochemical cells, to determine the mass transfer
coefficients and understand their hydrodynamics. Cells were studied in batch and flow design,
varying stirring rate, the stirring position and spacing between electrodes. In order to
determine the current limit, and thus the mass transfer coefficient (Km), it was used a
concentration gradient of K4[FeCN]6 / K3[FeCN]6 (2:1) from 4 to 24 mM, in medium of 0.5
M NaOH. The results clearly showed that regarding the batch cell, increasing stirring rate and
changing its position promote a considerable effect on Km; in the flow cell, no influences were
achieved when the spacing of the electrodes was modified when the stirring (flow) is directed
to the electrode surface; and, the flow cells are more efficient with regard to the elimination of
inherent physical resistance to the electrochemical treatment. Finally, the results showed that
the application of reactor is possible to treat electrochemically BTX because the better
geometry has been identified, favoring the oxidation of the species on the electrode surface
more rapidly and efficiently. |
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