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UF membrane fouling by mixtures of humic acids and sodium alginate: Fouling mechanisms and reversibility, Desalination, Volume 264, Issue 3, pp 220–227.

UF membrane fouling by mixtures of humic acids and sodium alginate: Fouling mechanisms and reversibility, Desalination, Volume 264, Issue 3, pp 220–227.

Έτος : 2010

Author : Katsoufidou K.S., Sioutopoulos D.C., Yiantsios S.G., Karabelas A.J.

The fouling characteristics of ultrafiltration (UF) hollow fibers are studied in dead-end mode, with and without periodic backwashing, by filtering dilute mixtures of humic acids (HA) and sodium alginate (SA) — a polysaccharide — in the presence and absence of calcium ions. The fouling behaviour of the HA/SA mixtures (regarding reversibility by backwashing and flux recovery) is quite similar to that of polysaccharides alone, even when the SA proportion is relatively small. The organic species rejection in filtration of HA/SA mixtures is greater than that for separate HA or SA filtration, increasing with increased polysaccharides concentration in solution. In the presence of Ca2+, the cake filtration mechanism dominates; some deviation, at the start of filtration, especially with HA-rich mixtures, is attributed to membrane pore constriction possibly caused by small molecules, not retained by the developing cake. The specific cake resistances of HA/SA mixtures are relatively high and tend to be much closer to those of SA deposits, than to HA layer resistances. The reversibility of mixed fouling layers and the very high flux recovery by backwashing are attributed to their coherent gel-like structure, which is a typical feature of polysaccharides.

Desalination264220-227Download

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