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Previous issue date: 2008-07-25 / The study of a promising alternative for the treatment of produced water from the oil industry envisaging its reuse was the focus of this work. Millions of liters of water are generated per day, containing heavy metals in low concentrations (< 0,15 mg/L for Pb, <0,04 mg/L for Cd, <0,04 mg/L for Ni). The technology applied to extract these metals from aqueous phase was the solvent extraction and the extratants used were vegetable oils originated from coconut oil. They can be used in natural form or as derivatives, known as MAC - Mixture of Carbox?lics Acids. The determination of the heavy metal con?centrations in a complex matrix was made by using the atomic absorption spectrometry technique (AAS). On the bench tests using synthetics aqueous solutions containing metals, vegetable oils showed no power to extract the metals studied. The extractant MAC was selective for the Pb> Cd> Ni, in the concentration of 8% in the same organic phase. In this condition, the lower efficiency of extraction obtained was 92% for the Pb, 69% for the Cd, in the range of pH ranging from 6 to 8. An experimental planning was conducted for continuous tests. The device used was called MDIF Misturador-Decantador ? Invers?o de Fases and the aqueous phase was produced water from P?lo Indutrial de Guamar?/RN . No correlation between the studied variables (concentration of metal, concentration of extratant and agitation in the mixing chamer) could be obtained, because of possible factors which occurred as: variation in the composition of the studied sample, phenomena of precipitation and complexation of metals in the reservoir of feed, solubility of extratant / O estudo de uma promissora alternativa para o tratamento de ?guas produzidas da ind?stria do petr?leo visando a sua reutiliza??o foi o foco deste trabalho. S?o milh?es de litros de ?gua/dia descartados ao mar, atrav?s de emiss?rios submarinos, contendo metais pesados em baixas concentra??es (< 0,15 mg/L de Pb, <0,04 mg/L de Cd, <0,04 mg/L de Ni). A tecnologia utilizada para extrair esses metais da fase aquosa foi a extra??o por solvente e os extratantes estudados foram ?leos vegetais in natura e derivados do ?leo de coco, denominada MAC Mistura de ?cidos Carbox?licos. A determina??o da concentra??o dos metais pesados em matriz complexa foi realizada utilizando o EAA Espectr?metro de Absor??o At?mica. Nos ensaios de bancada realizados, com solu??es sint?ticas contendo metais, os ?leos vegetais n?o apresentaram poder de extra??o dos metais estudados. J? o extratante MAC foi seletivo para o Pb > Cd > Ni na concentra??o de 8% do mesmo na fase org?nica. Nesta condi??o, a menor efici?ncia de extra??o obtida foi de 92% para o Pb, 69% para o Cd, na faixa de pH variando de 6 a 8. Um planejamento experimental foi realizado para os ensaios em regime cont?nuo. O equipamento utilizado foi o MDIF - Misturador Decantador ? Invers?o de Fases e a fase aquosa utilizada foi a ?gua produzida proveniente da sa?da do SAO Separador ?gua ?leo do P?lo Industrial de Guamar?/RN. Nenhuma correla??o entre as vari?veis estudadas, concentra??o do metal, concentra??o do extratante e agita??o na c?mara de mistura pode ser obtida devido a poss?veis fatores ocorridos como: varia??o na composi??o da amostra estudada, fen?menos de precipita??o e complexa??o de metais no reservat?rio de alimenta??o, solubiliza??o do extratante
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/15880 |
| Date | 25 July 2008 |
| Creators | Santana, Dulcin?ia de Castro |
| Contributors | CPF:16838572400, http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4787949Y0#Bancas, Fernandes J?nior, Wilaci Eutr?pio, CPF:40658830406, http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4701139Z9, Benedetto, Jeaneth dos Santos, CPF:16339665691, http://lattes.cnpq.br/7171354938935702, Melo, Josette Lourdes de Sousa, CPF:10200720406, http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4787094H6, Oliveira, Jackson Ara?jo de, CPF:65331060587, http://lattes.cnpq.br/5058617634570704, Lima, Raquel Franco de Souza, Paulo, Jo?o Bosco de Ara?jo |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Engenharia Qu?mica, UFRN, BR, Pesquisa e Desenvolvimento de Tecnologias Regionais |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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