The effect of CA membrane properties on adsorptive fouling by humic acid

Combe, Corine; Molis, E; Lucas, Pascale; Riley, R. L.; Clark, Mark M.

doi:10.1016/s0376-7388(98)00268-3

Cited by 219 publications

(96 citation statements)

References 31 publications

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“…Adsorption phenomena have also been described to cause or at least initiate the so called adsorptive fouling. Modification of the surface properties of membranes were reported to alleviate but not eliminate this last phenomenon [21].…”

Section: Figmentioning

confidence: 99%

“…adsorption of low molecular weight substances at the pore walls, cake built-up at the surface of the membrane and mechanical pore plugging. Some molecules, such as proteins, polysaccharides, humic acids and FFA, are reported to cause drastic flux reductions during filtration processes although their size is much smaller than the pore diameter [16][17][18][19][20][21]. This internal fouling is attributed to pore narrowing as a result of the adsorption of these compounds.…”

Section: Introductionmentioning

confidence: 99%

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Adsorptive fouling of inorganic membranes during microfiltration of vegetable oils

Hafidi

Pioch

Ajana

2003

Euro J Lipid Sci & Tech

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a The objective of the present paper is to contribute to a better understanding of the fouling phenomenon occurring during microfiltration of crude vegetable oil. To assess the role some oil components play in the fouling, the latter was monitored by the evolution of fluxes during the microfiltration of different model oils. Resistances to mass transfer were discussed to estimate the contribution of different phenomena and to compare hydrophilic and hydrophobic membrane materials. A drastic flux decline was obtained when filtering crude sunflower oil through different types of alumina membranes. Purified sunflower oil, with or without added free fatty acids, did not show any important fouling during crossflow microfiltration, suggesting that neither triglycerides nor free fatty acids are involved in the phenomenon to a large extent. By way of contrast, addition of phospholipids to the purified oil caused a drastic flux drop similar to that observed for the crude oil. The presence of small amounts of phospholipids increased the resistance to about 60 to 130% compared to that of the purified oil. The reason is most likely a fast adsorption occurring in the first instants during membrane wetting. Overall the fouling phenomenon is probably due to the fact that the phospholipids form supramolecular structures at the surface of the membrane.

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Section: Figmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adsorptive fouling of inorganic membranes during microfiltration of vegetable oils

Hafidi

Pioch

Ajana

2003

Euro J Lipid Sci & Tech

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“…Various analytical techniques have been employed for elucidating specific physical and chemical surface properties of membranes, including Raman spectroscopy (structure) [1], electron spin resonance (solute mobility in membrane polymer matrix and pores) [1], AFM (surface morphology, structure, and pore size) [1][2][3][4][5][6][7][8][9], streaming potential (membrane surface zeta potential) [10,11], NMR spectroscopy (permeability) [5], contact angle [12], and X-ray photoelectron spectroscopy (XPS) for surface chemical functional groups [13,14]. Despite these efforts, however, the role of membrane surface properties in colloidal fouling of RO/NF membranes is still not well understood.…”

Section: Introductionmentioning

confidence: 99%

Influence of membrane surface properties on initial rate of colloidal fouling of reverse osmosis and nanofiltration membranes

Vrijenhoek

Hong

Elimelech

2001

Journal of Membrane Science

1,072

552

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“…Part of the effects may come from the increase in the mean pore size of membranes due to hydrolysis, as discussed in the literature [20]. Another possible mechanism for the increase in proton permeability may be related to the enhancement of membrane hydrophilicity caused by hydrolysis.…”

Section: Cta Hydrolysis and The Stability Of Pimmentioning

confidence: 97%

Polymer Inclusion Membranes with Strip Dispersion

Wang

Hsien

et al. 2017

Water

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Abstract:The present work investigated the permeation of indium ions through a polymer inclusion membrane (PIM), prepared with cellulose triacetate (CTA) as the base polymer, tris(2-butoxyethyl) phosphate (TBEP) as the plasticizer and di-(2-ethylhexyl)phosphoric acid (D2EHPA) as the extractant. With 5 M HCl aqueous solution as the strip solution, we observed an initial indium permeability of 2.4 × 10 −4 m/min. However, the permeability decreases with time, dropping to about 3.4 × 10 −5 m/min after 200 min of operation. Evidence was obtained showing that hydrolysis of CTA occurred, causing a dramatic decrease in the feed pH (protons transported from strip to feed solutions) and a loss of extractant and plasticizer from the membrane, and then leading to the loss of indium permeability. To alleviate the problem of hydrolysis, we proposed an operation scheme called polymer inclusion membranes with strip dispersion: dispersing the strip solution in extractant-containing oil and then bringing the dispersion to contact with the polymer membrane. Since the strong acid was dispersed in oil, the membrane did not directly contact the strong acid at all times, and membrane hydrolysis was thus alleviated and the loss of indium permeability was effectively prevented. With the proposed scheme, a stable indium permeability of 2.5 × 10 −4 m/min was obtained during the whole time period of the permeation experiment.

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The effect of CA membrane properties on adsorptive fouling by humic acid

Cited by 219 publications

References 31 publications

Adsorptive fouling of inorganic membranes during microfiltration of vegetable oils

Adsorptive fouling of inorganic membranes during microfiltration of vegetable oils

Influence of membrane surface properties on initial rate of colloidal fouling of reverse osmosis and nanofiltration membranes

Polymer Inclusion Membranes with Strip Dispersion

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