Removal of nano and microparticles by granular filter media coated with nanoporous aluminium oxide

Conventional filtration was designed to achieve high levels of particle and pathogen removal. Previous studies have examined the possibility of modifying filtration media to improve their ability to remove microorganisms and viruses. Although these studies have evaluated filter media coatings for th...

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Bibliographic Details
Published in:Water science and technology 2004-01, Vol.50 (12), p.223-228
Main Authors: Lau, B L T, Harrington, G W, Anderson, M A, Tejedor, I
Format: Article
Language:English
Subjects:
Activated carbon
Aluminum
Aluminum oxide
Aluminum Oxide - chemistry
Anthracite
Bacteria - isolation & purification
Bacteriophages - isolation & purification
Charcoal - chemistry
Filter media
Filtration
Hydrogen-Ion Concentration
Latex
Maintenance management
Media
Microorganisms
Microparticles
Microspheres
Nanotechnology
Particle Size
Porosity
Static Electricity
Time Factors
Waste Disposal, Fluid - methods
Water Purification - methods
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Summary:Conventional filtration was designed to achieve high levels of particle and pathogen removal. Previous studies have examined the possibility of modifying filtration media to improve their ability to remove microorganisms and viruses. Although these studies have evaluated filter media coatings for this purpose, none have evaluated nanoscale particle suspensions as coating materials. The overall goal of this paper is to describe the preliminary test results of nanoporous aluminium oxide coated media that can be used to enhance filtration of nano and microparticles. Filtration tests were carried out using columns packed with uncoated and coated forms of granular anthracite or granular activated carbon. A positive correlation between isoelectric pH of filter media and particle removal was observed. The modified filter media with a higher isoelectric pH facilitated better removal of bacteriophage MS2 and 3 microm latex microspheres, possibly due to increased favorable electrostatic interactions.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2004.0717