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Case study of an ultrafiltration plant treating bleach plant effluent from a pulp and paper mill

Nordin, Anna-Karin LU and Jönsson, Ann-Sofi LU (2006) In Desalination 201(1-3). p.277-289
Abstract
Bleach plant effluent is treated in the ultrafiltration plant at Stora Enso Nymblla pulp and paper mill. The plant is the largest of its kind in the world, with a total membrane area of 4800 m(2) (2900 m(2) on the softwood line and 1900 m(2) on the hardwood line) and a processing capacity of 400 m(3) bleach plant effluent per hour. The ultrafiltration plant has been in operation since 1995. The operating conditions have been altered with time. In this work the present performance of the ultrafiltration plant has been evaluated and ways to improve the performance further have been investigated. The largest changes are found at the ultrafiltration plant on the hardwood line. On the hardwood line the ultrafiltration plant consists of six... (More)
Bleach plant effluent is treated in the ultrafiltration plant at Stora Enso Nymblla pulp and paper mill. The plant is the largest of its kind in the world, with a total membrane area of 4800 m(2) (2900 m(2) on the softwood line and 1900 m(2) on the hardwood line) and a processing capacity of 400 m(3) bleach plant effluent per hour. The ultrafiltration plant has been in operation since 1995. The operating conditions have been altered with time. In this work the present performance of the ultrafiltration plant has been evaluated and ways to improve the performance further have been investigated. The largest changes are found at the ultrafiltration plant on the hardwood line. On the hardwood line the ultrafiltration plant consists of six stages in series, with a volume reduction of about 98%. A drastic decrease of flux with axial position in the modules in the last stage was revealed. The flux was found to be zero in the last part of the modules because of the high frictional pressure drop caused by the high viscosity (7.7 cP) of the liquid in the last stage. Using a calculation tool, it is shown that the flux in the last stage can be increased and the energy requirement decreased if a higher inlet transmembrane pressure is used or if the cross-flow velocity in the last stage is decreased. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
viscosity, ultrafiltration, bleach plant effluent, frictional pressure, drop
in
Desalination
volume
201
issue
1-3
pages
277 - 289
publisher
Elsevier
external identifiers
  • wos:000243254800026
  • scopus:33751181911
ISSN
1873-4464
DOI
10.1016/j.desal.2006.06.004
language
English
LU publication?
yes
id
fb294306-a12b-4a26-9ee5-4214ea169ee7 (old id 679496)
date added to LUP
2007-12-19 16:13:33
date last changed
2019-03-19 01:41:26
@article{fb294306-a12b-4a26-9ee5-4214ea169ee7,
  abstract     = {Bleach plant effluent is treated in the ultrafiltration plant at Stora Enso Nymblla pulp and paper mill. The plant is the largest of its kind in the world, with a total membrane area of 4800 m(2) (2900 m(2) on the softwood line and 1900 m(2) on the hardwood line) and a processing capacity of 400 m(3) bleach plant effluent per hour. The ultrafiltration plant has been in operation since 1995. The operating conditions have been altered with time. In this work the present performance of the ultrafiltration plant has been evaluated and ways to improve the performance further have been investigated. The largest changes are found at the ultrafiltration plant on the hardwood line. On the hardwood line the ultrafiltration plant consists of six stages in series, with a volume reduction of about 98%. A drastic decrease of flux with axial position in the modules in the last stage was revealed. The flux was found to be zero in the last part of the modules because of the high frictional pressure drop caused by the high viscosity (7.7 cP) of the liquid in the last stage. Using a calculation tool, it is shown that the flux in the last stage can be increased and the energy requirement decreased if a higher inlet transmembrane pressure is used or if the cross-flow velocity in the last stage is decreased.},
  author       = {Nordin, Anna-Karin and Jönsson, Ann-Sofi},
  issn         = {1873-4464},
  keyword      = {viscosity,ultrafiltration,bleach plant effluent,frictional pressure,drop},
  language     = {eng},
  number       = {1-3},
  pages        = {277--289},
  publisher    = {Elsevier},
  series       = {Desalination},
  title        = {Case study of an ultrafiltration plant treating bleach plant effluent from a pulp and paper mill},
  url          = {http://dx.doi.org/10.1016/j.desal.2006.06.004},
  volume       = {201},
  year         = {2006},
}