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24. | | TORREZAN, R.; CECCHI, H. M.; JARDINE, J. G.; VITALI, A. Avaliacao das perdas de sorbato de potassio em polpa de goiaba durante ao armazenamento a 25oC. In: CONGRESSO BRASILEIRO DE CIENCIA E TECNOLOGIA DE ALIMENTOS, 16., 1998, Rio de Janeiro, RJ. Anais... Rio de Janeiro: SBCTA, 1998. v.2, p.1081-1084, 1998. Biblioteca(s): Embrapa Agroindústria de Alimentos. |
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39. | | NESHICH, G.; JARDINE, J. G.; BERNARDES, R.; MAZONI, I.; MANCINI, A. L.; SILVEIRA, C. da. "Cloud computation" na forma de serviços WEB para um banco de dados federativo STING_RDB. In: SIMPÓSIO SOBRE INOVAÇÃO E CRIATIVIDADE CIENTÍFICA NA EMBRAPA, 1., 2008, Brasília, DF. Comunicações Selecionadas. Brasília, DF: Embrapa, 2008. Não paginado. Biblioteca(s): Embrapa Agricultura Digital. |
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Registros recuperados : 119 | |
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| Acesso ao texto completo restrito à biblioteca da Embrapa Instrumentação. Para informações adicionais entre em contato com cnpdia.biblioteca@embrapa.br. |
Registro Completo
Biblioteca(s): |
Embrapa Instrumentação. |
Data corrente: |
06/04/2005 |
Data da última atualização: |
30/04/2008 |
Autoria: |
ASSIS, O. B. G.; SILVA, E. R. |
Título: |
The use of electrochemical techniques for ceramic filtration medium cleaning. |
Ano de publicação: |
2003 |
Fonte/Imprenta: |
In: INTERNATIONAL LATIN-AMERICAN CONFRENCE ON POWDER TECHNOLOGY, 4, PTECH 2003, nov. 2003. Guarujá, SP. Anais... Guarujá, 2003. 1 CD-ROM. |
Idioma: |
Inglês |
Conteúdo: |
: Preliminary results of the use of electroomosis technique for removal of organic contaminants in ceramic filtration porous structure are presented. The method employed provokes the migration of chemical residue and waste retained or adsorbed on the pore surfaces by applying a controlled tension within an electrochemical system. Porous ceramics have been the most common filtration medium employed within a broad range of applications. Conventional cleaning of a ceramic medium is not entirely effective for organic contaminants since these are not excluded by size, but retained through chemical affinity to the oxide surface. Under an electrical current the adsorbed molecules underwent shear stress due to the diffiIse moving layer. In ionic state the specimens are dragged and thus move towards the opposite charged electrode. Phenol was chosen as a standard contaminant and tests carried out using commercial ceramic filtration candles. Relative contaminant concentration was assessed by optical densities (UV-Vis spectroscopy). The results show that removal is proportional for up to 58% of the contaminant in diluted condition. |
Palavras-Chave: |
Eletroosmose; Materiais porosos. |
Thesagro: |
Filtro. |
Categoria do assunto: |
-- |
Marc: |
LEADER 01694naa a2200169 a 4500 001 1028932 005 2008-04-30 008 2003 bl --- 0-- u #d 100 1 $aASSIS, O. B. G. 245 $aThe use of electrochemical techniques for ceramic filtration medium cleaning. 260 $c2003 520 $a: Preliminary results of the use of electroomosis technique for removal of organic contaminants in ceramic filtration porous structure are presented. The method employed provokes the migration of chemical residue and waste retained or adsorbed on the pore surfaces by applying a controlled tension within an electrochemical system. Porous ceramics have been the most common filtration medium employed within a broad range of applications. Conventional cleaning of a ceramic medium is not entirely effective for organic contaminants since these are not excluded by size, but retained through chemical affinity to the oxide surface. Under an electrical current the adsorbed molecules underwent shear stress due to the diffiIse moving layer. In ionic state the specimens are dragged and thus move towards the opposite charged electrode. Phenol was chosen as a standard contaminant and tests carried out using commercial ceramic filtration candles. Relative contaminant concentration was assessed by optical densities (UV-Vis spectroscopy). The results show that removal is proportional for up to 58% of the contaminant in diluted condition. 650 $aFiltro 653 $aEletroosmose 653 $aMateriais porosos 700 1 $aSILVA, E. R. 773 $tIn: INTERNATIONAL LATIN-AMERICAN CONFRENCE ON POWDER TECHNOLOGY, 4, PTECH 2003, nov. 2003. Guarujá, SP. Anais... Guarujá, 2003. 1 CD-ROM.
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