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Influence of temperature and cleaning on aromatic and semi-aromatic polyamide thin-film composite NF and RO membranes

Nilsson, Mattias LU ; Trägårdh, Gun LU and Östergren, Karin (2008) In Separation and Purification Technology 62. p.717-726
Abstract
Although cleaning removes fouling, it may change the properties of membranes and consequently influence their performance. We have evaluated the combined effect of acidic/alkaline cleaning and temperature on the performance of two aromatic membranes, one a reverse osmosis membrane (HR98PP) and the other a nanofiltration membrane (NF90), two semi-aromatic polypiperazine membranes (NF200, NFT 50) and a Desal 5DK nanofiltration membrane. At the retention minimum of each membrane, the KCl retention and the water permeability were in the order: NFT 50<NF200<Desal 5DK<NF90<HR98PP and HR98PP<NF90< NF200<Desal 5DK<NFT-50, respectively. After nanofiltration at elevated temperatures acidic and alkaline cleaning increased the... (More)
Although cleaning removes fouling, it may change the properties of membranes and consequently influence their performance. We have evaluated the combined effect of acidic/alkaline cleaning and temperature on the performance of two aromatic membranes, one a reverse osmosis membrane (HR98PP) and the other a nanofiltration membrane (NF90), two semi-aromatic polypiperazine membranes (NF200, NFT 50) and a Desal 5DK nanofiltration membrane. At the retention minimum of each membrane, the KCl retention and the water permeability were in the order: NFT 50<NF200<Desal 5DK<NF90<HR98PP and HR98PP<NF90< NF200<Desal 5DK<NFT-50, respectively. After nanofiltration at elevated temperatures acidic and alkaline cleaning increased the water permeability and decreased the retention of the Desal-5DK membrane. Similar behaviour was observed after acidic cleaning of the aromatic polyamide membranes and with alkaline cleaning of the semi-aromatic polyamide (polypiperazine) membranes. Increased hysteresis was seen in the membrane performance with increasing temperature. The hysteresis behaviour was dependent on the cleaning procedure and could be related to swelling and shrinkage of the active polyamide layer. At 40°C the reverse osmosis membrane (HR98PP) showed the same performance as the NF90 nanofiltration membrane at 20°C. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
membrane performance, cleaning, nanofiltration, retention, elevated temperatures
in
Separation and Purification Technology
volume
62
pages
717 - 726
publisher
Elsevier
external identifiers
  • wos:000258911000034
  • scopus:48349105083
ISSN
1873-3794
DOI
10.1016/j.seppur.2008.03.014
language
English
LU publication?
yes
id
d7f8d646-e139-4760-bb55-c2e6e5a2c382 (old id 1049435)
date added to LUP
2008-03-25 16:01:12
date last changed
2017-11-05 03:47:48
@article{d7f8d646-e139-4760-bb55-c2e6e5a2c382,
  abstract     = {Although cleaning removes fouling, it may change the properties of membranes and consequently influence their performance. We have evaluated the combined effect of acidic/alkaline cleaning and temperature on the performance of two aromatic membranes, one a reverse osmosis membrane (HR98PP) and the other a nanofiltration membrane (NF90), two semi-aromatic polypiperazine membranes (NF200, NFT 50) and a Desal 5DK nanofiltration membrane. At the retention minimum of each membrane, the KCl retention and the water permeability were in the order: NFT 50&lt;NF200&lt;Desal 5DK&lt;NF90&lt;HR98PP and HR98PP&lt;NF90&lt; NF200&lt;Desal 5DK&lt;NFT-50, respectively. After nanofiltration at elevated temperatures acidic and alkaline cleaning increased the water permeability and decreased the retention of the Desal-5DK membrane. Similar behaviour was observed after acidic cleaning of the aromatic polyamide membranes and with alkaline cleaning of the semi-aromatic polyamide (polypiperazine) membranes. Increased hysteresis was seen in the membrane performance with increasing temperature. The hysteresis behaviour was dependent on the cleaning procedure and could be related to swelling and shrinkage of the active polyamide layer. At 40°C the reverse osmosis membrane (HR98PP) showed the same performance as the NF90 nanofiltration membrane at 20°C.},
  author       = {Nilsson, Mattias and Trägårdh, Gun and Östergren, Karin},
  issn         = {1873-3794},
  keyword      = {membrane performance,cleaning,nanofiltration,retention,elevated temperatures},
  language     = {eng},
  pages        = {717--726},
  publisher    = {Elsevier},
  series       = {Separation and Purification Technology},
  title        = {Influence of temperature and cleaning on aromatic and semi-aromatic polyamide thin-film composite NF and RO membranes},
  url          = {http://dx.doi.org/10.1016/j.seppur.2008.03.014},
  volume       = {62},
  year         = {2008},
}