Effect of cross-flow velocity on membrane filtration performance in relation to membrane properties

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Abstract: Organic fouling of membrane is one of the barriers that limit the application of membrane in water separation. Study about the effect of cross-flow velocity (CFV) on fouling rate is important to ensure that the system is operating at optimal conditions. This paper investigates the influence of CFV on the permeate flux in cross-flow configuration of nanofiltration (NF) and reverse osmosis (RO) processes by treating an organic compound in aqueous suspension. A commercial Aldrich humic acid (AHA) of 15 mg/L was used as the feed solution. The experiments were conducted at different cross-flow velocities (i.e. 0.27, 0.39, and 0.60 m/s) under a constant driving pressure of 7 bar and at an operating temperature in the range of 22–25°C. The permeate flux for both NF and RO membranes tested with AHA foulant increased slightly with time at the cross-flow velocities of 0.39 and 0.60 m/s, respectively. Despite the increase in organic rejections with the increased CFV, the rejection performance of AHA suspension was only marginally affected by the variation of CFV. Low permeate rates (flux) and strong repulsive forces were the reasons of no fouling result observed in the NF and RO membranes throughout the studied duration (i.e. 8 h). Interpretations on the chemical (contact angle and elemental composition) and physical properties (visual inspection) of membranes have further confirmed this observation. To study the fouling behavior of these membranes, it is suggested that an AHA feed with higher concentration, an addition of calcium ions, a longer filtration duration, and a higher initial flux should be used.

Original languageEnglish
Pages (from-to)678-692
Number of pages15
JournalDesalination and Water Treatment
Volume55
Issue number3
DOIs
Publication statusPublished - 17 Jul 2015

Fingerprint

Flow velocity
flow velocity
membrane
Fouling
Membranes
fouling
Nanofiltration
humic acid
Reverse osmosis
Fluxes
Osmosis membranes
Organic compounds
Contact angle
effect
Calcium
organic compound
Physical properties
physical property
Inspection
calcium

Keywords

  • FTIR analysis
  • Humic acid
  • Nanofiltration
  • Organic compound removal
  • Repulsive force
  • Reverse osmosis
  • Visual inspection

ASJC Scopus subject areas

  • Water Science and Technology
  • Ocean Engineering
  • Pollution

Cite this

Effect of cross-flow velocity on membrane filtration performance in relation to membrane properties. / Koo, Chai Hoon; Mohammad, Abdul Wahab; Suja`, Fatihah.

In: Desalination and Water Treatment, Vol. 55, No. 3, 17.07.2015, p. 678-692.

Research output: Contribution to journalArticle

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