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Navegando Engenharia Ambiental por Assunto "Ácido diclorofenoxiacético"
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- ItemAvaliação 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 GranhenThe 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.
- ItemAvaliação da remoção do herbicida 2,4 diclorofenoxiacético (2,4 D) e do seu principal metabólito 2,4 diclorofenol (2,4 DCP) no sistema convencional de tratamento de água associado à pré-oxidação(Universidade Federal do Espírito Santo, 2009-06-26) Cardoso, Márcia Cristina Martins Campos; Jamal, Claudia Masrouah; Coelho, Edumar Ramos Cabral; Mendonça, Antônio Sérgio Ferreira; Paschoalato, Cristina Filomêna PereiraThrough the use of pesticides has been possible to increase the capacity to produce and harvest larger quantities of food in less space and time. In the other hand, agriculture causes greater impact in water resources and its intensi cation have contributed to stream degradation. Diclorophenoxiacetic acid (2,4-D) is one of the most used herbicides in the world to control a great variety of herbs in many cultures and has been frequently detected in surface water sources, wich are generally used as public water supply. In Brazil agrotoxic control in drinking water is established by law and 2,4-D's maximum allowable concentration is 30 µg.L−1 . The most used process in drinking water is the water conventional treatment (coagulation, occulation, sedimentation, ltration and disinfection). Therefore this paper has been made to evaluate the e ciency of water conventional treatment associated or not with preoxidation to 2,4-D and 2,4 Diclorophenol, its main metabolite. To accomplish this research, the water was collected by the Santa Maria da Vitória river. Preview studies were made to determinate the coagulant's and oxidant's dosage as for the contact period to optimizate the color removal. The tests were performed for the calcium hypochlorite and potassium permanganate were also tested in distilled water to assess the in uence on organic matter on removal of herbicides. The experiments's conditions had been established to evaluate herbicide removal in the sedimentation, ltration and disinfection in the conventional treatment and than the association with preoxidation in the herbicide's removal, considering di erents oxidants to both compounds studied. Accordind to the acquired results organic matter in the studied matrix had no in uence in the herbicide removal. Conventional treatment in association or not with preoxidation was not e cient in the 2,4-D herbicide using ativated chlorine or potassium permanganate. To 2,4D, conventional treatment had no relevant results, but in association with preoxidation to both oxidants, the herbicide was not detected after disinfection.
- ItemRemoção 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 RosaThe 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.