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Influence of prefiltration on membrane performance during isolation of lignin-carbohydrate complexes from spent sulfite liquor

Al-Rudainy, Basel LU ; Galbe, Mats LU and Wallberg, Ola LU (2017) In Separation and Purification Technology 187. p.380-388
Abstract

In this study, we examined the isolation of lignin-carbohydrate complexes (LCCs) from sodium-based spent sulfite liquor, in conjunction with minimization of membrane fouling. We screened 3 polysulfone (PS) membranes with cutoffs of 100, 50, and 25 kDa, respectively. Flux and retention for the 100- and 50-kDa membranes had the same order of magnitude, indicating that these properties were determined by fouling that formed on the membrane—not pore size. The PS membrane with the 50-kDa cutoff performed best in terms of flux and retention of lignin-carbohydrate complexes and experienced the least membrane fouling. Two prefiltration methods were used to decrease the fouling of the 50-kDa membrane: a 0.2-μm PS microfiltration membrane and... (More)

In this study, we examined the isolation of lignin-carbohydrate complexes (LCCs) from sodium-based spent sulfite liquor, in conjunction with minimization of membrane fouling. We screened 3 polysulfone (PS) membranes with cutoffs of 100, 50, and 25 kDa, respectively. Flux and retention for the 100- and 50-kDa membranes had the same order of magnitude, indicating that these properties were determined by fouling that formed on the membrane—not pore size. The PS membrane with the 50-kDa cutoff performed best in terms of flux and retention of lignin-carbohydrate complexes and experienced the least membrane fouling. Two prefiltration methods were used to decrease the fouling of the 50-kDa membrane: a 0.2-μm PS microfiltration membrane and dead-end filtration with 10-um filter cloth and a 4 wt% mixture of kieselguhr (diatomite) and spent sulfite liquor prior to filtration. Prefiltration of the SSL with microfiltration increased the flux 3-fold and decreased the fouling grade from 49% to 7.2%. Dead-end filtration effected a 16% increase in flux and a fouling grade of 17%. The retention of LCC during microfiltration was high, which resulted in a loss of high-molecular-weight products, whereas the loss of LCC during dead-end filtration was negligible. A 50-kDa PS membrane performed best with regard to the recovery of lignin-carbohydrate complexes from spent sulfite liquor. Also, dead-end filtration is a promising method for eliminating membrane fouling.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Dead-end filtration, Fouling, Galactoglucomannan, Lignin, Lignin-carbohydrate-complex, Microfiltration, Prefiltration, Spent sulfite liquor, Ultrafiltration
in
Separation and Purification Technology
volume
187
pages
9 pages
publisher
Elsevier
external identifiers
  • scopus:85021749900
ISSN
1383-5866
DOI
10.1016/j.seppur.2017.06.031
language
English
LU publication?
yes
id
db8cf127-c15b-4253-ace2-eff13ad00e28
date added to LUP
2017-07-18 12:21:30
date last changed
2017-07-18 12:21:30
@article{db8cf127-c15b-4253-ace2-eff13ad00e28,
  abstract     = {<p>In this study, we examined the isolation of lignin-carbohydrate complexes (LCCs) from sodium-based spent sulfite liquor, in conjunction with minimization of membrane fouling. We screened 3 polysulfone (PS) membranes with cutoffs of 100, 50, and 25 kDa, respectively. Flux and retention for the 100- and 50-kDa membranes had the same order of magnitude, indicating that these properties were determined by fouling that formed on the membrane—not pore size. The PS membrane with the 50-kDa cutoff performed best in terms of flux and retention of lignin-carbohydrate complexes and experienced the least membrane fouling. Two prefiltration methods were used to decrease the fouling of the 50-kDa membrane: a 0.2-μm PS microfiltration membrane and dead-end filtration with 10-um filter cloth and a 4 wt% mixture of kieselguhr (diatomite) and spent sulfite liquor prior to filtration. Prefiltration of the SSL with microfiltration increased the flux 3-fold and decreased the fouling grade from 49% to 7.2%. Dead-end filtration effected a 16% increase in flux and a fouling grade of 17%. The retention of LCC during microfiltration was high, which resulted in a loss of high-molecular-weight products, whereas the loss of LCC during dead-end filtration was negligible. A 50-kDa PS membrane performed best with regard to the recovery of lignin-carbohydrate complexes from spent sulfite liquor. Also, dead-end filtration is a promising method for eliminating membrane fouling.</p>},
  author       = {Al-Rudainy, Basel and Galbe, Mats and Wallberg, Ola},
  issn         = {1383-5866},
  keyword      = {Dead-end filtration,Fouling,Galactoglucomannan,Lignin,Lignin-carbohydrate-complex,Microfiltration,Prefiltration,Spent sulfite liquor,Ultrafiltration},
  language     = {eng},
  month        = {10},
  pages        = {380--388},
  publisher    = {Elsevier},
  series       = {Separation and Purification Technology},
  title        = {Influence of prefiltration on membrane performance during isolation of lignin-carbohydrate complexes from spent sulfite liquor},
  url          = {http://dx.doi.org/10.1016/j.seppur.2017.06.031},
  volume       = {187},
  year         = {2017},
}