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Reduction of energy demand by use of air sparging during ultrafiltration of alkali-extracted wheat bran hemicelluloses

Thuvander, Johan LU ; Arkell, Anders LU and Jönsson, Ann-Sofi LU (2018) In Chemical Engineering Research and Design 138. p.43-50
Abstract
The flux during membrane filtration can be enhanced by the use of a two-phase gas–liquid flow. This has been shown to be an energy-efficient alternative to increasing the cross-flow velocity. In this work, air sparging was used to increase the flux during ultrafiltration of alkali-extracted wheat bran hemicelluloses. Batch filtration was performed in a pilot unit with a ceramic ultrafiltration membrane with a nominal cut-off of 10 kDa. Parametric studies with and without air sparging were performed at temperatures of 30 °C, 50 °C and 80 °C and cross-flow velocities of 1, 3, 5 and 7 m/s. The limiting flux was not affected by air sparging at 30 °C, while a slight increase was observed at 50 °C and a considerable increase was obtained at 80... (More)
The flux during membrane filtration can be enhanced by the use of a two-phase gas–liquid flow. This has been shown to be an energy-efficient alternative to increasing the cross-flow velocity. In this work, air sparging was used to increase the flux during ultrafiltration of alkali-extracted wheat bran hemicelluloses. Batch filtration was performed in a pilot unit with a ceramic ultrafiltration membrane with a nominal cut-off of 10 kDa. Parametric studies with and without air sparging were performed at temperatures of 30 °C, 50 °C and 80 °C and cross-flow velocities of 1, 3, 5 and 7 m/s. The limiting flux was not affected by air sparging at 30 °C, while a slight increase was observed at 50 °C and a considerable increase was obtained at 80 °C. Air sparging reduced the energy demand per m3 permeate produced during dead-end batch ultrafiltration at 80 °C and 1 m/s from 0.96 kWh/m3 to 0.51 kWh/m3. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Two-phase gas–liquid flow, Ultrafiltration, Hemicelluloses, Wheat bran, Flux enhancement
in
Chemical Engineering Research and Design
volume
138
pages
43 - 50
publisher
IChemE
external identifiers
  • scopus:85052222781
ISSN
0263-8762
DOI
10.1016/j.cherd.2018.08.001
language
English
LU publication?
yes
id
660d64ce-13b9-4360-a786-5b1ffd7c810b
date added to LUP
2018-09-17 15:53:47
date last changed
2018-10-03 12:04:39
@article{660d64ce-13b9-4360-a786-5b1ffd7c810b,
  abstract     = {The flux during membrane filtration can be enhanced by the use of a two-phase gas–liquid flow. This has been shown to be an energy-efficient alternative to increasing the cross-flow velocity. In this work, air sparging was used to increase the flux during ultrafiltration of alkali-extracted wheat bran hemicelluloses. Batch filtration was performed in a pilot unit with a ceramic ultrafiltration membrane with a nominal cut-off of 10 kDa. Parametric studies with and without air sparging were performed at temperatures of 30 °C, 50 °C and 80 °C and cross-flow velocities of 1, 3, 5 and 7 m/s. The limiting flux was not affected by air sparging at 30 °C, while a slight increase was observed at 50 °C and a considerable increase was obtained at 80 °C. Air sparging reduced the energy demand per m3 permeate produced during dead-end batch ultrafiltration at 80 °C and 1 m/s from 0.96 kWh/m3 to 0.51 kWh/m3.},
  author       = {Thuvander, Johan and Arkell, Anders and Jönsson, Ann-Sofi},
  issn         = {0263-8762},
  keyword      = {Two-phase gas–liquid flow,Ultrafiltration,Hemicelluloses,Wheat bran,Flux enhancement},
  language     = {eng},
  month        = {08},
  pages        = {43--50},
  publisher    = {IChemE},
  series       = {Chemical Engineering Research and Design},
  title        = {Reduction of energy demand by use of air sparging during ultrafiltration of alkali-extracted wheat bran hemicelluloses},
  url          = {http://dx.doi.org/10.1016/j.cherd.2018.08.001},
  volume       = {138},
  year         = {2018},
}