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Previous issue date: 2016-03-28 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / Urea is an organic contaminant on ultrapure water production for
semiconductors, remove it is hard due to its molecular characteristics of non-volatile,
tough oxidation, non-ionic, high soluble and low molecular weight. This paper had
been studied the dissolved urea oxidation by hypobromite, formed in situ from
reaction between sodium bromide and sodium hypochlorite. The experimental tests
evaluated the hypobromite formation through the time of hypobromite formation, the
urea removal was quantified by TOC data (total organic carbon), on this case were
performed different conditions of hypobomite concentrations, pH of solution
containing urea, time of urea oxidation and bromate concentration. Either the pH, as
the time of hypobromite formation do not affect the amount of urea reduced.
Otherwise, the hypobromite concentration and bromide sodium concentration
interfered its results. The hypobromite is capable to reduce main part of urea
dissolved in water when in absence of others NOM (natural organic matter). The best
results on this study were achieved with ultrapure water used as solvent,
hypobromite concentration of 3 mgL-1. / A ureia ? um contaminante org?nico na produ??o de ?gua ultrapura para
semicondutores, sua remo??o ? dif?cil devido as suas caracter?sticas de n?ovolatilidade,
dif?cil oxida??o, car?ter n?o i?nico, altamente sol?vel em ?gua e baixa
massa molar. Nesse trabalho foi estudada a remo??o da ureia dissolvida em ?gua
atrav?s da oxida??o do ?on hipobromito, formado in situ pela rea??o de brometo de
s?dio e hipoclorito de s?dio. Na parte experimental foi avaliada a forma??o do ?on
hipobromito atrav?s da varia??o do tempo de forma??o do mesmo, e analisada a
remo??o de ureia atrav?s dos valores de COT (carbono org?nico total), neste caso
foram alterados os valores de concentra??o de hipobromito, concentra??o de
brometo final, tempo de oxida??o com a ureia e pH da rea??o. Foram observadas
que, tanto o pH como o tempo de forma??o de hipobromito n?o interferem na
efici?ncia de remo??o da ureia, ao contr?rio da concentra??o de hipobromito e
concentra??o de brometo utilizado. Verificou-se que hipobromito ? capaz de
remover quase completamente a ureia presente em ?gua quando em aus?ncia de
NOM (material org?nico de ocorr?ncia natural). Os melhores resultados obtidos
foram com ?gua ultrapura e concentra??o de 3 mgL-1 de hipobromito.
| Identifer | oai:union.ndltd.org:IBICT/oai:tede2.pucrs.br:tede/6675 |
| Date | 28 March 2016 |
| Creators | Perez, Giulia Pieta |
| Contributors | Pires, Mar?al Jos? Rodrigues |
| Publisher | Pontif?cia Universidade Cat?lica do Rio Grande do Sul, Programa de P?s-Gradua??o em Engenharia e Tecnologia de Materiais, PUCRS, Brasil, Faculdade de Engenharia |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da PUC_RS, instname:Pontifícia Universidade Católica do Rio Grande do Sul, instacron:PUC_RS |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | -7432719344215120122, 600, 600, 600, 600, -655770572761439785, 4518971056484826825, 2075167498588264571 |
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