Aplicação de tecnologias eletroquímicas como alternativa para o tratamento de efluentes de salão de beleza
One of the electrochemical advanced oxidation processes is anodic oxidation, which is very efficient in treating wastewater that contains different organic contaminants. Two beauty salon effluents were collected and treated using electrochemical oxidation and their initial physical-chemical analy...
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| Formato: | doctoralThesis |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/55335 |
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| Resumo: | One of the electrochemical advanced oxidation processes is anodic oxidation, which is
very efficient in treating wastewater that contains different organic contaminants. Two
beauty salon effluents were collected and treated using electrochemical oxidation and their
initial physical-chemical analysis demonstrated an average COD of 1612 and the second of
1496 mg O2 L–1, turbidity of the first effluent of 477 NTU and the second of 1000 NTU in
addition to the presence of trace metals such as: iron, copper, chromium and zinc. The
experimental analyzes were carried out in a laboratory-scale plant, using an
electrochemical flow cell consisting of a circular stainless steel plate as cathode and
another containing boron-doped diamond (BDD) as anode, both with an active surface of
69.4 cm2, separated by a distance of 1.7 cm. For each experiment, 1.2 liters of
contaminated effluent were placed in the reservoir tank where it was circulated for 360
minutes and samples were collected at specific time intervals through the reaction
compartment cell. Electrolyses were carried out applying 10 and 30 mA.cm–2, using
different electrolytes (NaCl, Na2SO4 or Na2S2O8) in various concentrations. When
comparing the treatments used in the first effluent, the one that had the best efficiency was
the analysis with low current density together with the addition of 0.16 M sodium chloride,
in which there was an average decrease in COD of 65%. In the treatments of the second
effluent, a photochemical cell coupled to the hydraulic circuit was used in a simultaneous
process with the electrochemical reactor along with the addition of sodium persulfate.
Knowing that the reaction with the use of sodium chloride can form chlorinated
substances, leaving the final effluent with high toxicity and in the analyzes with sodium
persulfate the acidity index reached pH 2.0, then it is necessary to optimize a process with
greater efficiency, better yield and more viable. In the analyzes of the second effluent, we
discovered results that clearly showed that 6 h of treatment with Na2SO4 achieved 58%
COD removal and 73% less turbidity, with an energy consumption of around 0.52 kWh m3, being the best electrolyte option for treating this effluent by applying 10 mA.cm-2. This way, the final effluents can be disposed of in the sewage system or nature with fewer pollutants. |
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