Engenharia Ambiental

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http://repositorio.ufes.br/handle/10/17610
Programa de Pós-Graduação em Engenharia Ambiental

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Telefone: (27) 3335 2324 R*9510
URL do programa: http://www.ambiental.ufes.br/pos-graduacao/PPGEA

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Navegando Engenharia Ambiental por Assunto "2,4-dichlorophenoxyacetic acid"

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    Avaliação da remoção do ácido 2,4-diclorofenoxiacético (2,4-D) pelo sistema convencional de tratamento de água e pelo processo de nanofiltração
    (Universidade Federal do Espírito Santo, 2013-11-28) Souza, Karoline Barros de; Coelho, Edumar Ramos Cabral; Siman, Renato Ribeiro; Mierzwa, José Carlos; Silva Filho, Eloi Alves da
    Pesticides have contributed to increased agricultural productivity. Nevertheless, its use is related to damage to the environment and public health. The conventional drinking water treatment, widely used in Brazil, is ineffective in removing many of these compounds, requiring the use of alternative technologies. The membrane filtration systems, particularly nanofiltration has been shown to be an efficient technology for the removal of pesticides in water treatment. The aim of this study was to evaluate the removal of the pesticide 2,4-D by conventional drinking water treatment in raw water and by nanofiltration in ultrapure water and filtered water from the water treatment plant. Pesticides were detected and quantified using high performance liquid chromatography with a validated methodology. After the construction of coagulation diagrams for raw water collected in Water Treatment Plant Carapina (Serra, ES) from Santa Maria da Vitória river, the efficiency of conventional drinking water treatment for removing of 2,4-D was performed through assay jar test, with the addition of the commercial pesticide in the raw water. The nanofiltration tests were performed with ultrapure water and filtered water fortified with 2,4-D in triplicate. The samples were characterized according to the parameters: temperature, turbidity, conductivity, absorbance at 254 nm, color, alkalinity, TOC and concentration of the pesticide 2,4-D and 2,4,5-T and metabolite 2,4-DCP. The different tests were evaluated in terms of the rejection of these variables. The conventional drinking water treatment was effective in removing turbidity, absorbance at 254 nm and color, though not allowed the removal of 2,4-D. The NF-90 membrane allowed the removal of turbidity, conductivity, color, absorbance at 254 nm and TOC and also showed high removal of the pesticide 2,4-D. The removal of this pesticide is associated with pesticide molecular weight and charge and with membrane charge and molecular weight cut-off not being influenced by the water matrix. The size exclusion and electrostatic repulsion were the main phenomena observed in the removal of this pesticide. The formation of the metabolite 2,4-DCP was observed in the retentate, which may be associated with an increase in temperature. The water permeability and permeate flux was reduced particularly after nanofiltration tests in filtered water, and may be associated with higher levels of conductivity, absorbance at 254 nm and TOC in this matrix. These parameters can cause changes in the NF-90 membrane, reducing its efficiency. Therefore, the nanofiltration was found to be effective in removing the pesticide 2,4-D and other parameters, attending the maximum allowed values established by Ordinance No. 2914/2011 of the Ministry of Health.
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    Remoção do herbicida 2,4 diclorofenoxiacético (2,4-D) no tratamento convencional de água e associado à adsorção em carvão ativado em pó (CAP) em escala piloto
    (Universidade Federal do Espírito Santo, 2014-07-09) Guerra, Jacquelinne Fantin; Coelho, Edumar Ramos Cabral; Siman, Renato Ribeiro; Paschoalato, Cristina Filomena Pereira Rosa
    The increased use of pesticides in Brazil has caused many concerns, both in relation to environmental issues as public health. Many of these compounds are not efficiently removed by conventional water treatment, alternatives necessary to remove the water supply being. Among the existing technologies adsorption in PAC is considered one of the most effective and reliable, whose advantages include high removal efficiency and ease of operation. The objective of this research is to evaluate the removal in pilot scale, the pesticide 2,4-D and its major metabolite 2,4-DCP in water samples treated by adsorption on PAC associated with TCV. The tests were conducted in a pilot plant in the area of Carapina ETA / CESAN. The raw water from the river was the Santa Maria da Vitoria purposely contaminated by the addition of pesticides in its commercial formula. Four trials, two without addition of PAC and two addition with the cap unit rapid mixing were performed. The pesticides were detected and quantified by high performance liquid chromatography-effectiveness, validated methodology. The samples were characterized according to the parameters: temperature, turbidity, conductivity, absorbance at 254 nm, actual color, apparent color, alkalinity, total organic carbon, addition and concentration of the pesticide 2,4- D and 2,4,5-T and 2,4-DCP metabolite. The different assays were assessed in terms of the rate of removal of these parameters. As a result the addition of PAC with treatment conventional the compound of interest was removed below 30 μ.L-1 Maximum Value Allowed, established by Ordinance of the Ministry of Health n ° 2.914/2011 for dosage of 100 μ.L-1 and showed It is also effective in removing organic material. In none of the tests the compound 2,4-DCP and 2,4,5-T was detected.