Navegando por Autor "Carvalho, P. C. A. P."
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Artigo Oil removal from oilfield produced water by sand filter(ASSOCIAÇAO BRASILEIRA DE PETRÓLEO E GÁS - ABPG, 2016-10-04) Carvalho, P. C. A. P.; Foletto, Edson Luiz; Barros Neto, Eduardo Lins de; Chiavone Filho, OsvaldoThe aim of this work is to examine the performance of a glass column filled with a sand filter in oil removal from oilfield produced water (OPW) and synthetic produced water (SOPW). This paper investigated the influence of process parameters such as physical characteristics of sand, column height, types of effluent (oilfield produced water and synthetic produced water), and oil concentration on oil removal efficiency. An OPW sample was taken from effluents of the oilfield unity located at Rio Grande do Norte State (Brazil), and the SOPW sample was prepared using two types of oils and salts (NaCl and KCl). The results showed that the oil concentration decreased significantly after the filtration process. The oil removal efficiency was influenced by the sand particle size and bed height, reaching 90% using a 30 cm high sand bed composed by mixed grain sizesArtigo Removal of organic contaminants from a synthetic oilfield produced water by adsorption process using vegetable and bone bovine activated carbons(ASSOCIAÇÃO BRASILEIRA DE PETRÓLEO E GÁS - ABPG, 2019-10-08) Carvalho, P. C. A. P.; Foletto, Edson Luiz; Dotto, Guilherme Luiz; Rackov, C. K. O. S.; Barros Neto, Eduardo Lins de; Chiavone Filho, OsvaldoThe production of oil and gas is usually accompanied by the production of waste water, which contains several organic pollutants. The objective of this work is to investigate the removal of organic load from synthetic oilfield produced water by adsorption process, using activated carbons from vegetable and animal origin. The synthetic oilfield produced water was constituted by a mixture of xylene, n–heptane, phenol, and NaCl in aqueous solution. The structural properties of the samples were investigated by X–ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), N2 adsorption–desorption isotherms, and scanning electron microscopy (SEM). Effects of temperature and type of adsorbent on the adsorption process were investigated. According to the results, the temperature of 25 °C was more favorable in adsorption of organic load from synthetic oilfield produced water. Pseudo–first order, pseudo–second order, and Elovich equations were able to represent the adsorption kinetics. The vegetable activated carbon delivered the best results, being the most efficient to remove the organic load due its high surface area. The adsorption capacities were 28 and 15 mgTOC g–1, for vegetable and animal activated carbons, respectively