Advanced

Nanomechanical characterization of recalcitrant foulants and hollow fibemembranes in ultrafiltration systems

Gutierrez, Leonardo; Keucken, Alexander LU ; Aubry, Cyril; San Martin, Teresa Vera and Croue, Jean Philippe (2018) In Desalination and Water Treatment 136. p.49-64
Abstract

Long-term nanomechanical changes of polymeric ultrafiltration (UF) membranes caused by fouling/cleaning agents in water treatment are not well established in the literature. The goal of this study was to investigate the nanomechanical properties of polymeric UF hollow fiber membranes operating at a pilot-scale for 449 d and subjected to a low-quality feed (i.e., high turbidity/TOC content). Quantitative nanomechanical mapping technique was used to measure the deformation, dissipation, modulus, adhesion, and roughness of the polymeric structures of commercial Aquaflex virgin membranes, harvested membranes, and foulant layers. Results indicated that the recalcitrant and heterogeneous nature of the foulants absorbed on harvested membranes... (More)

Long-term nanomechanical changes of polymeric ultrafiltration (UF) membranes caused by fouling/cleaning agents in water treatment are not well established in the literature. The goal of this study was to investigate the nanomechanical properties of polymeric UF hollow fiber membranes operating at a pilot-scale for 449 d and subjected to a low-quality feed (i.e., high turbidity/TOC content). Quantitative nanomechanical mapping technique was used to measure the deformation, dissipation, modulus, adhesion, and roughness of the polymeric structures of commercial Aquaflex virgin membranes, harvested membranes, and foulant layers. Results indicated that the recalcitrant and heterogeneous nature of the foulants absorbed on harvested membranes showed low elastic properties, and high modulus, adhesion, and roughness. The strong affinity of these foulants towards membrane surface would alter membrane characteristics and influence subsequent fouling behaviour. The cleaning process and extended operation did not significantly affect the nanomechanical properties of membranes. Despite the low-quality feed, the three modules were only subjected to 37 chemi-cal-enhanced backwashes and filtered a total volume of 2.155 m3. These results indicate the importance of operating conditions (i.e., frequency of backwash/cleaning/disinfection steps) and feed quality on the long-term changes of UF membranes and would assist in identifying research directions that are necessary to minimize membrane fouling/ageing.

(Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Aquantitative nanomechanical mapping, Chemical cleaning, Fouling, Hollow fiber membranes, Ultrafiltration
in
Desalination and Water Treatment
volume
136
pages
16 pages
publisher
Desalination Publications
external identifiers
  • scopus:85058214492
ISSN
1944-3994
DOI
10.5004/dwt.2018.23257
language
English
LU publication?
yes
id
7aaef5ba-d787-471c-a8ae-03ebe69ecf86
date added to LUP
2019-01-04 08:53:40
date last changed
2019-09-17 04:46:20
@article{7aaef5ba-d787-471c-a8ae-03ebe69ecf86,
  abstract     = {<p>Long-term nanomechanical changes of polymeric ultrafiltration (UF) membranes caused by fouling/cleaning agents in water treatment are not well established in the literature. The goal of this study was to investigate the nanomechanical properties of polymeric UF hollow fiber membranes operating at a pilot-scale for 449 d and subjected to a low-quality feed (i.e., high turbidity/TOC content). Quantitative nanomechanical mapping technique was used to measure the deformation, dissipation, modulus, adhesion, and roughness of the polymeric structures of commercial Aquaflex virgin membranes, harvested membranes, and foulant layers. Results indicated that the recalcitrant and heterogeneous nature of the foulants absorbed on harvested membranes showed low elastic properties, and high modulus, adhesion, and roughness. The strong affinity of these foulants towards membrane surface would alter membrane characteristics and influence subsequent fouling behaviour. The cleaning process and extended operation did not significantly affect the nanomechanical properties of membranes. Despite the low-quality feed, the three modules were only subjected to 37 chemi-cal-enhanced backwashes and filtered a total volume of 2.155 m<sup>3</sup>. These results indicate the importance of operating conditions (i.e., frequency of backwash/cleaning/disinfection steps) and feed quality on the long-term changes of UF membranes and would assist in identifying research directions that are necessary to minimize membrane fouling/ageing.</p>},
  author       = {Gutierrez, Leonardo and Keucken, Alexander and Aubry, Cyril and San Martin, Teresa Vera and Croue, Jean Philippe},
  issn         = {1944-3994},
  keyword      = {Aquantitative nanomechanical mapping,Chemical cleaning,Fouling,Hollow fiber membranes,Ultrafiltration},
  language     = {eng},
  pages        = {49--64},
  publisher    = {Desalination Publications},
  series       = {Desalination and Water Treatment},
  title        = {Nanomechanical characterization of recalcitrant foulants and hollow fibemembranes in ultrafiltration systems},
  url          = {http://dx.doi.org/10.5004/dwt.2018.23257},
  volume       = {136},
  year         = {2018},
}