Determination of cake porosity using image analysis in a coagulation-microfiltration system

Pyungkyu Park, Chung Hak Lee, Sangho Lee

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

Porosity of a cake layer formed through particle deposition plays an important role in the filtration performance of low-pressure membranes. An experimental analytical method for the direct measurement of cake porosity in a coagulation-microfiltration was developed using a CLSM and image analysis technique. A series of aggregates suspensions with different sizes and fractal dimensions were prepared with 0.1 μm of fluorescent polystyrene latex beads. Microfiltration of each suspension was carried out to form a cake layer whose porosity was measured using CLSM with an optical section of 2 μm and an image analysis program. To validate this method, measured porosities were compared with those calculated from specific cake resistances using the Carman-Kozeny equation. The two sets of porosities were in good agreement, confirmed statistically by a t-test. Based on this analysis technique, the effects of size and fractal dimension of aggregates on cake porosity and compressibility were investigated under various operating pressures. For low fractal dimensions the cake porosity was barely dependent on the fractal dimension of aggregates, whereas for high fractal dimensions it decreased with increasing fractal dimension.

Original languageEnglish
Pages (from-to)66-72
Number of pages7
JournalJournal of Membrane Science
Volume293
Issue number1-2
DOIs
Publication statusPublished - 2007 Apr 20

Fingerprint

Microfiltration
Porosity
Fractals
coagulation
Coagulation
image analysis
Image analysis
Fractal dimension
fractals
porosity
Suspensions
Pressure
latex
Latexes
Microspheres
Compressibility
beads
compressibility
Polystyrenes
polystyrene

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

Cite this

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abstract = "Porosity of a cake layer formed through particle deposition plays an important role in the filtration performance of low-pressure membranes. An experimental analytical method for the direct measurement of cake porosity in a coagulation-microfiltration was developed using a CLSM and image analysis technique. A series of aggregates suspensions with different sizes and fractal dimensions were prepared with 0.1 μm of fluorescent polystyrene latex beads. Microfiltration of each suspension was carried out to form a cake layer whose porosity was measured using CLSM with an optical section of 2 μm and an image analysis program. To validate this method, measured porosities were compared with those calculated from specific cake resistances using the Carman-Kozeny equation. The two sets of porosities were in good agreement, confirmed statistically by a t-test. Based on this analysis technique, the effects of size and fractal dimension of aggregates on cake porosity and compressibility were investigated under various operating pressures. For low fractal dimensions the cake porosity was barely dependent on the fractal dimension of aggregates, whereas for high fractal dimensions it decreased with increasing fractal dimension.",
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Determination of cake porosity using image analysis in a coagulation-microfiltration system. / Park, Pyungkyu; Lee, Chung Hak; Lee, Sangho.

In: Journal of Membrane Science, Vol. 293, No. 1-2, 20.04.2007, p. 66-72.

Research output: Contribution to journalArticle

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