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Membrane cleaning - a case study in a sulphite pulp mill bleach plant

Wallberg, Ola LU ; Jönsson, Ann-Sofi LU and Wickstrom, P (2001) In Desalination 141(3). p.259-268
Abstract
A study was performed. to evaluate the cleaning and operation of the ultrafiltration plant at the Nymolla paper mill in southern Sweden Laboratory tests were carried out in order to find out what the fouling layer consists of and to find the most appropriate cleaning procedure Production data were analysed to establish if the membranes are cleaned unnecessarily often The fouling in the plant is mainly of organic origin and is seen as brown precipitation on the surface of the membranes Analysis of the membrane surface with energy dispersive X-rays (EDX) showed that there is also some inorganic fouling, mostly silicon, iron and magnesium Cleaning tests were carried out on a small laboratory test unit from PCI using fouled membranes from the... (More)
A study was performed. to evaluate the cleaning and operation of the ultrafiltration plant at the Nymolla paper mill in southern Sweden Laboratory tests were carried out in order to find out what the fouling layer consists of and to find the most appropriate cleaning procedure Production data were analysed to establish if the membranes are cleaned unnecessarily often The fouling in the plant is mainly of organic origin and is seen as brown precipitation on the surface of the membranes Analysis of the membrane surface with energy dispersive X-rays (EDX) showed that there is also some inorganic fouling, mostly silicon, iron and magnesium Cleaning tests were carried out on a small laboratory test unit from PCI using fouled membranes from the mill Both acid and alkaline chemicals were used to clean the membranes It was shown that the current cleaning procedure was not optimal and some improvements are suggested Production data showed that the membranes are often cleaned when there is no decline in flux This leads to high wear on the membranes and shortens their operational lifetime Less frequent cleaning, especially during the first stages, of the UF plant is therefore recommended It was found that many of the membrane tubes were clogged with a clay-like precipitation consisting of fibres, organic material and precipitated magnesium hydroxide This clay completely stopped the flow through the tube, thereby reducing the active membrane area of the UF plant. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
frequency, fouling, bleach plant effluent, ultrafiltration, cleaning
in
Desalination
volume
141
issue
3
pages
259 - 268
publisher
Elsevier
external identifiers
  • wos:000172863100004
  • scopus:0035977473
ISSN
1873-4464
DOI
10.1016/S0011-9164(01)85004-9
language
English
LU publication?
yes
id
8dfe9f13-b3e5-475c-818f-3d559eec8057 (old id 3915663)
date added to LUP
2013-07-02 11:11:14
date last changed
2018-01-07 05:07:03
@article{8dfe9f13-b3e5-475c-818f-3d559eec8057,
  abstract     = {A study was performed. to evaluate the cleaning and operation of the ultrafiltration plant at the Nymolla paper mill in southern Sweden Laboratory tests were carried out in order to find out what the fouling layer consists of and to find the most appropriate cleaning procedure Production data were analysed to establish if the membranes are cleaned unnecessarily often The fouling in the plant is mainly of organic origin and is seen as brown precipitation on the surface of the membranes Analysis of the membrane surface with energy dispersive X-rays (EDX) showed that there is also some inorganic fouling, mostly silicon, iron and magnesium Cleaning tests were carried out on a small laboratory test unit from PCI using fouled membranes from the mill Both acid and alkaline chemicals were used to clean the membranes It was shown that the current cleaning procedure was not optimal and some improvements are suggested Production data showed that the membranes are often cleaned when there is no decline in flux This leads to high wear on the membranes and shortens their operational lifetime Less frequent cleaning, especially during the first stages, of the UF plant is therefore recommended It was found that many of the membrane tubes were clogged with a clay-like precipitation consisting of fibres, organic material and precipitated magnesium hydroxide This clay completely stopped the flow through the tube, thereby reducing the active membrane area of the UF plant.},
  author       = {Wallberg, Ola and Jönsson, Ann-Sofi and Wickstrom, P},
  issn         = {1873-4464},
  keyword      = {frequency,fouling,bleach plant effluent,ultrafiltration,cleaning},
  language     = {eng},
  number       = {3},
  pages        = {259--268},
  publisher    = {Elsevier},
  series       = {Desalination},
  title        = {Membrane cleaning - a case study in a sulphite pulp mill bleach plant},
  url          = {http://dx.doi.org/10.1016/S0011-9164(01)85004-9},
  volume       = {141},
  year         = {2001},
}