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- W1996319309 abstract "Low-pressure membranes suffer from particulate, organic and biological fouling during operation. In order to elucidate the impact of nanoparticles on membrane fouling, experiments were carried out with a small membrane test unit operated with artifi cial and natural waters. Both microfi ltration (MF) and ultrafi ltration (UF) membranes were used. Artifi cial waters were made from ultra pure water spiked with polystyrene or magnetite nanoparticles with sizes between 20 and 250 nm in varying particle concentrations. During the fi ltration tests the permeability decreased with time indicating a blocking of the membrane pores by nanoparticles. During the fi ltration of small particles (20–30 nm) the permeability dropped to a signifi cantly lower level than during fi ltration of larger particles (100–250 nm). Under the tested conditions the nanoparticle concentration seemed to have no infl uence. In natural waters particulate fouling tended to be overlapped by other fouling processes such as organic fouling. With the test unit the fouling potential of raw waters could be characterized within a short period of time whereas the nanoparticles in the feed waters were characterized by a special analysis based on Laser-induced Breakdown Detection (LIBD). With this highly sensitive quantifi cation method it was possible to determine both nanoparticle size (down to 10 nm in diameter) and concentration (down to a few ng/L) in the feed and the fi ltrate. In the fi ltrates of the MF membrane operated with spiked feed waters, nanoparticles were detected indicating their breakthrough. Comparatively, under similar conditions the UF membrane showed a very high retention of such nanoparticles." @default.
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- W1996319309 date "2009-09-01" @default.
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- W1996319309 title "Characterization of nanoparticulate fouling and breakthrough during low-pressure membrane filtration" @default.
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- W1996319309 doi "https://doi.org/10.5004/dwt.2009.812" @default.
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