Assessing the fouling mechanisms of high-pressure nanofiltration membrane using the modified Hermia model and the resistance-in-series model

E. E. Chang, Sung Yueh Yang, Chin Pao Huang, Chung Huei Liang, Pen Chi Chiang

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

The fouling phenomenon and associated fouling mechanisms of the cross-flow type nanofiltration membrane were investigated using the modified Hermia empirical model and the resistance-in-series model. The effects of pH on membrane permeate flux and the rejection of natural organic matter (NOM) were also studied. Natural water and the effluent of a rapid sand filter (SF) were used as the source waters. The results showed that when the raw water was treated, the highest flux decline occurred at pH 5 due to weak electrostatic repulsion between the charged membrane and NOM. Moreover, a two-step fouling process in flux decline before 7 h and after 7 h was observed during the treatment of the raw water. Ultimately, physically reversible rather than irreversible fouling was the main fouling mechanism. Standard blocking was not a fouling mechanism for either of the water samples treated at any pH level, indicating that the foulants were not adsorbed onto the inner walls of membrane pores. For raw water, intermediate blocking was the major fouling mechanism at all pH levels, whereas for the SF effluent, gel layer formation played the major role in membrane fouling at all pH levels.

Original languageEnglish
Pages (from-to)329-336
Number of pages8
JournalSeparation and Purification Technology
Volume79
Issue number3
DOIs
Publication statusPublished - Jun 24 2011

Fingerprint

Nanofiltration membranes
Fouling
Water
Fluxes
Membranes
Biological materials
Effluents
Sand
Membrane fouling
Electrostatics
Gels

Keywords

  • Flux decline
  • Fouling mechanisms
  • Natural organic matters
  • Rejection
  • Two-step fouling

ASJC Scopus subject areas

  • Analytical Chemistry
  • Filtration and Separation

Cite this

Assessing the fouling mechanisms of high-pressure nanofiltration membrane using the modified Hermia model and the resistance-in-series model. / Chang, E. E.; Yang, Sung Yueh; Huang, Chin Pao; Liang, Chung Huei; Chiang, Pen Chi.

In: Separation and Purification Technology, Vol. 79, No. 3, 24.06.2011, p. 329-336.

Research output: Contribution to journalArticle

Chang, E. E. ; Yang, Sung Yueh ; Huang, Chin Pao ; Liang, Chung Huei ; Chiang, Pen Chi. / Assessing the fouling mechanisms of high-pressure nanofiltration membrane using the modified Hermia model and the resistance-in-series model. In: Separation and Purification Technology. 2011 ; Vol. 79, No. 3. pp. 329-336.
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