Mestrado em Energia

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http://repositorio.ufes.br/handle/10/17605

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Navegando Mestrado em Energia por Autor "Asano, Patricia Teixeira Leite"

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    Eletrofloculador contínuo e monitorado para tratar emulsão oleosa sintética: análise da eficiência de separação e do consumo de energia elétrica
    (Universidade Federal do Espírito Santo, 2020-03-25) Nascimento, Bárbara Zon; Porto, Paulo Sergio da Silva; https://orcid.org/0000000264867813; http://lattes.cnpq.br/7140925853660088; https://orcid.org/0000-0001-8768-078X; http://lattes.cnpq.br/1507503376593169; Bacelos, Marcelo Silveira; https://orcid.org/0000000208386839; http://lattes.cnpq.br/3741207242086712; Asano, Patricia Teixeira Leite; https://orcid.org/0000-0003-2410-3621; http://lattes.cnpq.br/5742286307682505; Castro, Eustaquio Vinicius Ribeiro de; https://orcid.org/0000-0002-7888-8076; http://lattes.cnpq.br/1055263403980509
    Oily effluents are generated in many industrial processes, such as metallurgy, oil refining, petrochemicals, food industries, paint, leather and metal finishing. The improper disposal of these effluents compromises water resources due to the low degradability of the oil. In this context, there is a search for more efficient and economically viable treatment methods. In this research, it was investigated the use of electrofloculation in the treatment of a synthetic oily emulsion with an initial concentration of 200 mg/L in a monitored bench. An experiment design of 32 was implemented with the distance between electrodes fixed at 2 cm to analyze the effects of the factors. The effects of retention time (24, 30 and 36 min) and polarity inversion time (10, 20 and 30 s) were evaluated in relation to electricity consumption and the percentage of removal of oil and grease content, chemical oxygen demand and turbidity. From the experimental conditions, %TOG was achieved between 69.17 and 91.46 %, %COD between 92.80 and 96.25 %, %Turb between 99.23 and 99.79 % and Cen between 4.193 and 7.210 kW.h/m3 . The highest oil removal efficiency was 91.46 % in the retention time of 36 min and in the polarity inversion time of 30 s. In this condition, the energy consumption was approximately 6 kW.h/m3 . The statistical models were satisfactory to predict test results with experimental conditions in the investigated range. The pH and temperature of the final effluent attended to the current environmental legislation. The aluminum concentration in the effluent was higher than is allowed by legislation, varying between 28.2 and 66 mg/L at pH 2 and between 2.6 and 8.8 mg/L at pH 7. The results obtained allowed conclude that the electroflocculation technique was efficient for the treatment of oily effluents.