Flux enhancement with gas injection in crossflow ultrafiltration of oily wastewater

The gas injection technique was introduced to achieve flux improvement in cross-flow ultrafiltration of oil emulsion. By the nitrogen gas injection, homogeneous liquid phase oil/water emulsion was changed to heterogeneous gas–liquid phase. The injected gas causes positive effect of promoting turbule...

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Bibliographic Details
Published in:Water research (Oxford) 2001-12, Vol.35 (17), p.4095-4101
Main Authors: Um, Mi-Jung, Yoon, Seong-Hoon, Lee, Chung-Hak, Chung, Kun-Yong, Kim, Jae-Jin
Format: Article
Language:English
Subjects:
Air Movements
Applied sciences
Bubbles
emulsion
Emulsions
Exact sciences and technology
film theory
Filtration
Fluid dynamics
Fluid flow
Flux
Gases
gas–liquid phase
Hydrocarbons - analysis
Industrial Waste
Industrial wastewaters
Liquid phases
Mass transfer
Membranes
Natural gas
Nitrogen
oil
Pollution
Porosity
Turbulence
Turbulent flow
ultrafiltration
Waste Disposal, Fluid - methods
Wastewater
Wastewaters
Water Movements
Water Purification - methods
Water treatment and pollution
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Summary:The gas injection technique was introduced to achieve flux improvement in cross-flow ultrafiltration of oil emulsion. By the nitrogen gas injection, homogeneous liquid phase oil/water emulsion was changed to heterogeneous gas–liquid phase. The injected gas causes positive effect of promoting turbulence, but it also has negative effect of decreasing the effective membrane area due to the partial occupation of membrane pores by bubbles. The efficiency of the gas injection was found out to be dependent on bubble fractions in the mixture: at sufficient bubble fractions the higher flux was observed, but at lower bubble fractions the flux rather decreased compared with that without gas injection. An attempt was made to explain the mechanisms for the dual aspects of gas injection. Turbulence dampening effect was also observed when the dependence of mass transfer coefficient on cross-flow rate was investigated with gas injection.
ISSN:0043-1354
1879-2448
DOI:10.1016/S0043-1354(01)00155-5