The effect of NOM characteristics and membrane type on microfiltration performance

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The_effect_of_NOM_characteristics_and_membrane.pdf

http://eprints.org/relation/isVersionOf https://vuir.vu.edu.au/id/document/1325 http://eprints.org/relation/isVolatileVersionOf https://vuir.vu.edu.au/id/document/1325 http://eprints.org/relation/isCoversheetVersionOf https://vuir.vu.edu.au/id/document/1325 archive 292 disk0/00/00/20/17 2009-03-30 12:38:14 2024-06-21 02:45:21 2009-03-30 12:38:14 article show Gray Stephen 0000-0002-8748-2748 Ritchie C. B Tran Thuy Bolto Brian Bolto, Brian The effect of NOM characteristics and membrane type on microfiltration performance pub 300000 cesare microfiltration, membranes, natural organic matter, fouling, hydrophobic and hydrophilic membranes Efforts to understand and predict the role of different organic fractions in the fouling of low-pressure membranes are presented. Preliminary experiments with an experimental apparatus that incorporates automatic backwashing and filtration over several days has shown that microfiltration of the hydrophilic fractions leads to rapid flux decline and the formation of a cake or gel layer, while the hydrophobic fractions show a steady flux decline and no obvious formation of a gel or cake layer. The addition of calcium to the weakly hydrophobic acid (WHA) fraction led to the formation of a gel layer from associations between components of the WHA. The dominant foulants were found to be the neutral and charged hydrophilic compounds, with hydrophobic and small pore size membranes being the most readily fouled. The findings suggest that surface analyses such as FTIR will preferentially identify hydrophilic compounds as the main foulants, as these components form a gel layer on the surface while the hydrophobic compounds adsorb within the membrane pores. Furthermore, coagulation pre-treatment is also likely to reduce fouling by reducing pore constriction rather than the formation of a gel layer, as coagulants remove the hydrophobic compounds to a large extent and very little of the hydrophilic neutral components. 2007-09 published Elsevier 54875 2 2383515 dark_document 54875 correspondence2.pdf application/pdf 358d100e63b524d5b8850a658bd47ec5 MD5 111891 2020-07-13 03:55:14 2017 3 3 application/pdf text Correspondence en staffonly

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other public Water Research : a Journal of the International Water Association (IWA) 41 17 3833 -3841 TRUE 0043-1354 Includes bibliographical references: pp. 13-16 FALSE