Optimizing dissolved air flotation design system

Optimizing dissolved air flotation design system

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.

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Main Authors: Féris,L.A., Gallina,S.C.W., Rodrigues,R.T., Rubio,J.
Format: Digital revista
Language:English
Published: Brazilian Society of Chemical Engineering 2000
Online Access:http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66322000000400019
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spelling oai:scielo:S0104-663220000004000192001-03-16Optimizing dissolved air flotation design systemFéris,L.A.Gallina,S.C.W.Rodrigues,R.T.Rubio,J. flotation precipitate air saturation system surfactant 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.info:eu-repo/semantics/openAccessBrazilian Society of Chemical EngineeringBrazilian Journal of Chemical Engineering v.17 n.4-7 20002000-12-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66322000000400019en10.1590/S0104-66322000000400019
institution SCIELO
collection OJS
country Brasil
countrycode BR
component Revista
access En linea
databasecode rev-scielo-br
tag revista
region America del Sur
libraryname SciELO
language English
format Digital
author Féris,L.A.
Gallina,S.C.W.
Rodrigues,R.T.
Rubio,J.
spellingShingle Féris,L.A.
Gallina,S.C.W.
Rodrigues,R.T.
Rubio,J.
Optimizing dissolved air flotation design system
author_facet Féris,L.A.
Gallina,S.C.W.
Rodrigues,R.T.
Rubio,J.
author_sort Féris,L.A.
title Optimizing dissolved air flotation design system
title_short Optimizing dissolved air flotation design system
title_full Optimizing dissolved air flotation design system
title_fullStr Optimizing dissolved air flotation design system
title_full_unstemmed Optimizing dissolved air flotation design system
title_sort optimizing dissolved air flotation design system
description 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.
publisher Brazilian Society of Chemical Engineering
publishDate 2000
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66322000000400019
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AT gallinascw optimizingdissolvedairflotationdesignsystem
AT rodriguesrt optimizingdissolvedairflotationdesignsystem
AT rubioj optimizingdissolvedairflotationdesignsystem
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