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Doctoral Thesis
DOI
https://doi.org/10.11606/T.18.2016.tde-01122016-122301
Document
Author
Full name
Edumar Ramos Cabral Coelho
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2002
Supervisor
Committee
Di Bernardo, Luiz (President)
Daniel, Luiz Antonio
Paterniani, José Euclides Stipp
Rezende, Maria Olímpia de Oliveira
Sens, Mauricio Luiz
Title in Portuguese
Influência da pré-oxidação com ozônio e peróxido de hidrogênio na remoção de atrazina em filtros lentos de areia e carvão ativado granular
Keywords in Portuguese
Atrazina
Carvão ativado granular
Filtração lenta
Ozônio
Peróxido de hidrogênio
Abstract in Portuguese
O interesse na remoção de material orgânico no tratamento de águas de abastecimento surgiu em decorrência do aumento na poluição dos mananciais, da descoberta de novas doenças de veiculação hídrica e do melhor conhecimento das propriedades mutagênicas e carcinogênicas de poluentes orgânicos, entre eles os agroquímicos. Na presente pesquisa foi estudada a seqüência de processos de tratamento: pré-filtração; pré-oxidação com ozônio e ozônio associado ao peróxido de hidrogênio e filtração lenta com leito de areia e leito de carvão ativado granular. Para concentração de atrazina no afluente entre 2,2 e 110,3 µg/L o filtro lento de areia com camada intermediária de carvão ativado granular apresentou para a condição de não utilização de pré-oxidação valores para atrazina no efluente inferiores a 2,0 µg/L e para dose de ozônio entre 0,9 e 3,7 mg/L e para relação de peróxido de hidrogênio entre 0,1 e 1,1 valores para atrazina inferiores a 0,1 µg/L. O sistema de tratamento com pré-filtração, pré-oxidação com ozônio e ozônio associado ao peróxido de hidrogênio seguido da filtração lenta com camada intermediária de carvão ativado granular, mostrou-se eficiente na remoção de atrazina para concentrações inferiores a 0,1 µg/L.
Title in English
Effects of pre-oxidation with ozone and ozone associated to hydrogen peroxide in removing atrazine in slow sand filtration and granular activated carbon filtration
Keywords in English
Atrazine
Granular carbon activated
Hydrogen peroxide
Ozone
Slow sand filtration
Abstract in English
The interest in removing organic matter in supplying waters treatment processes emerged from the increasing levels of water pollution worldwide, the discovery of new water-born diseases and of a better knowledge of mutating (mutagenic) and carcinogenic features of organic pollutants, including the pesticides. The two sequential arrangements for the water treatment process considered in this research were: 1) pre-filtration, slow sand filtration and granular activated carbon filtration; and 2) pre-filtration, pre-oxidation with ozone and ozone associated to hydrogen peroxide, slow sand filtration and granular activated carbon filtration. For concentrations of atrazine between 2.2 and 110.3 µg/L in the affluent, its concentration in the effluent was lower than 2.0 µg/L for the first arrangement, and lower than 01 µg/L for the second one, in this case for consumed doses of ozone between 0.9 and 3.7 mg/L and ratio H2O2/O3 between 0.1 and 1.1. The treatment system used composed of pre-filtration, pre-oxidation with ozone and ozone associated to hydrogen peroxide followed by the slow filtration, with an intermediate layer of granular activated carbon, was found efficient in reducing atrazine to levels inferior to 0.1 µg/L.
 
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Publishing Date
2016-12-02
 
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