Comparison of membrane permeability and a fouling mechanism by pre-ozonation followed by membrane filtration and residual ozone in membrane cells

Sang-Hyup Lee, Kwanyong Lee, Wan Mohtar Wan, Yongsu Choi

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

The mechanism of reducing fouling by means of ozone was investigated using wastewater from a wastewater treatment facility. Effects such as particle size increase from particle destabilization, organic degradation from high MW to low MW, and bio-fouling reduction from microbiological disinfection were studied. By means of ozone treatment, the permeate flux decline by fouling was improved, E. coli was disinfected completely, the thickness of the foulant layer was reduced by about 50%, and most of high molecular weight (MW) was degraded to low MW, respectively. However, the concentration of TOC in permeates increased by about 70%, and the amount of small particle size distribution (less than 5 μm) was increased. From these results, the major membrane fouling reduction effect resulted from the degradation of organic compounds, from high MW to low MW, and microbiological The SEM images of the membrane cross-section revealed that the thickness of the foulant layer was about 1.4 μm with ozone treatment. Without ozone treatment the cross-section image was about 3.2 μm. This could be due to the fact that foulants degraded from high MW material to low MW and penetrated into the permeate. The increase of TOC concentration was another result of the degradation reaction.

Original languageEnglish
Pages (from-to)287-294
Number of pages8
JournalDesalination
Volume178
Issue number1-3 SPEC. ISS.
DOIs
Publication statusPublished - 2005 Jul 10

Keywords

  • Biofouling reduction
  • Degradation reaction
  • Microfiltration
  • Ozone
  • Particle destabilization
  • Pretreatment

ASJC Scopus subject areas

  • Filtration and Separation

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