Mestrado em Engenharia Ambiental

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http://repositorio.ufes.br/handle/10/17612

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Navegando Mestrado em Engenharia Ambiental por Assunto "2,4-D"

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    Avaliação da adsorção do herbicida 2,4-D em carvão ativado em pó utilizando água com diferentes qualidades
    (Universidade Federal do Espírito Santo, 2015-02-03) Marsolla, Lorena Dornelas; Coelho, Edumar Ramos Cabral; Siman, Renato Ribeiro; Tavares, Célia Regina Granhen
    The 2,4-dichlorophenoxyacetic (2,4-D) is one of herbicides most consumed in Brazil and is preferably used due to its good selectivity and low cost. It has high toxicity and low biodegradability, posing a risk to human health and the environment and can be found in soil, surface water and groundwater. Studies show that conventional water treatment has low effectiveness in removing microcontaminants, various techniques have been used in the removal of water in compounds, such as adsorption by activated carbon. The activated carbon adsorption has been shown as an effective technology for the removal of various contaminants, including pesticides. Thus, this study aimed to evaluate 2,4-D adsorption of three activated carbons (PAC) in ultrapure water and raw water from the Rio Santa Maria da Vitória. The quantification of the herbicide was analyzed by high performance liquid chromatography after concentration of the sample by extraction in solid phase. The adsorption experiments were performed with activated carbon derived from coconut shell (PAC-01), pine (PAC-02), coffee straw (PAC-03) which were characterized and evaluated on its removal capacity of 2,4-D the two matrices of water. Two models of adsorption isotherm, Langmuir and Freundlich, were applied to describe the adsorption data, that indicated the PAC-02 as the coal that had the best 2,4-D adsorption capacity among the studied coals, both in water ultrapure as in raw water. When tested in the raw water, there was reduced 2,4-D adsorption for the three samples from PAC compared to tests performed in ultrapure water, indicating interfering compounds, such as organic matter, on the adsorption process.
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    Remoção do ácido 2,4-diclorofenoxiacético (2,4-D) por adsorção em carvão ativado pulverizado associado ao tratamento convencional de água para consumo humano
    (Universidade Federal do Espírito Santo, 2013-07-05) Leal, Waldiléia Pereira; Coelho, Edumar Ramos Cabral; Paschoalato, Cristina Filomêna Pereira Rosa; Reis, José Antonio Tosta dos
    The 2,4-D is the second most widely used herbicide in Brazil, reaching the public water supply. Due to the limitation of conventional treatment in removing microcontaminants and capacity of activated carbon to remove them, this study investigated the application of powdered activated carbon (PAC) in the removal of 2,4-D in adsorption process associated with conventional treatment using raw water from the Rio Santa Maria da Vitória in equipment jartest. The diagrams of coagulation were constructed through treatability study of water using aluminum sulfate and polyaluminum chloride as coagulants. Tests of adsorption with carbons derived from coconut shells (PAC 1) and pinus (PAC 2) were characterized and evaluated in its ability to remove 2,4-D. The removal of natural organic matter was also determined by measuring the dissolved organic carbon (DOC) and UV absorbance at 254 nm. To detection and quantification of analytes, acids 2,4-D, 2,4,5-T and 2,4-DCP an analytical methodology for high performance liquid chromatography (HPLC/DAD) was developed and validated. Through the adsorption data, the PAC 1 showed greater capacity for removal of 2,4-D and was associated with conventional treatment, fifteen minutes prior, one minute prior to or one minute after the addition of the aluminum sulfate. The results indicated that the addition of coagulant had no effect on adsorption capacity of the PAC 1 which showed to be being effective for the removal of herbicide, given the drinking water quality standards force.