Repositório Digital

A- A A+

Optimizing dissolved air flotation design system

.

Optimizing dissolved air flotation design system

Mostrar registro completo

Estatísticas

Título Optimizing dissolved air flotation design system
Autor Feris, Liliana Amaral
Gallina, Samuel Cris Wiener
Rodrigues, Rafael Teixeira
Rubio, Jorge
Abstract Dissolved Air (Pressure) Flotation-DAF, is a well-established separation process that employs micro-bubbles as a carrier phase. This work shows results concerning bubble generation at low working pressures in modified DAF-units to improve the collection of fragile coagula by bubbles. DAF of Fe (OH)3 (as model) was studied as a function of saturation pressure in the absence and presence of surfactants in the saturator. DAF was possible at 2 atm by lowering the air/water surface tension. This fact, which leads to substantial energy savings, was explained in terms of decreasing the "minimum" energy required for bubble nucleation and cavity in the nozzle. More, bubbles-fragile coagula attachment was improved by dividing the recycling water into two: 1) the inclined inlet to the cell (traditional) and 2) inside the separation tank through a water flow inlet situated below the floating bed using a "mushroom" type diffuser. Because of the reduction observed in the degree of turbulence in the conventional collection zone, DAF performance improved yielding high precipitate recoveries.
Contido em Brazilian journal of chemical engineering. São Paulo, SP. Vol. 17, n. 4/7 (2000), p. 549-555
Assunto Flotação por ar dissolvido
Tratamento de efluentes
[en] Air saturation system
[en] Flotation
[en] Precipitate
[en] Surfactant
Origem Nacional
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/75859
Arquivos Descrição Formato
000296076.pdf (123.4Kb) Texto completo (inglês) Adobe PDF Visualizar/abrir

Este item está licenciado na Creative Commons License

Este item aparece na(s) seguinte(s) coleção(ões)


Mostrar registro completo

Percorrer



  • O autor é titular dos direitos autorais dos documentos disponíveis neste repositório e é vedada, nos termos da lei, a comercialização de qualquer espécie sem sua autorização prévia.
    Projeto gráfico elaborado pelo Caixola - Clube de Criação Fabico/UFRGS Powered by DSpace software, Version 1.8.1.