Streaming potential and SEM-EDX study of UF membranes fouled by colloidal iron

Soffer, Y.; Gilron, Jack; Adin, Avner

doi:10.1016/s0011-9164(02)00502-7

Cited by 27 publications

(19 citation statements)

References 8 publications

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“…The reason might be that there is less double-layer overlapping in the M200. This result is in good agreement with Ricq phenomenon has been observed by NystrÖ m et al [25] and Soffer et al [26]. A higher MWCO and higher permeate flux generate a greater charge displacement.…”

Section: Effect Of Ionic Strength On the Streaming Potentialsupporting

confidence: 92%

Electrokinetic characterization of poly(vinyl butyral) hollow fiber membranes by streaming potential and electroviscous effect

Qiu

2013

Journal of Membrane Science

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Section: Effect Of Ionic Strength On the Streaming Potentialsupporting

confidence: 92%

Electrokinetic characterization of poly(vinyl butyral) hollow fiber membranes by streaming potential and electroviscous effect

Qiu

2013

Journal of Membrane Science

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“…Note that this equation holds only for the instantaneous permeate concentration (ic P ) flowing out of the ultra filter and not the concentration (c P ) in the bottle collecting the permeate (see also Appendix 1). Colloidal fouling of cross-flow filtration membranes-Iron colloids are well known to cause fouling of ultrafiltration membranes (Soffer et al 2004(Soffer et al , 2002Waite et al 1999) leading to a reduction of permeate flow. In studies of Fe solubility, this also presents a problem as colloidal Fe will be adsorbed on the filter membrane and not in the retentate, resulting in an apparent loss of Fe from the system when considering a simple mass balance.…”

Section: Schlosser and Croot Fe Solubility By Cross-flow Filtrationmentioning

confidence: 99%

“…Fouling occurs initially by the advection and deposition of colloids onto the membrane causing pore blockage and is dependent on the permeate flux, colloid size, and zeta potential (Soffer et al 2004). The rate at which the colloid is deposited on the membrane can be written as (adapted from Soffer et al 2004): (6) where n uf is the number of moles of Fe deposited on the membrane, A is the area of the membrane, J is the permeate flux (L m -2 h -1 ), and J cr is the critical permeate flux (L m -2 h -1 ) below which no deposition can occur and is dependent on surface interactions.…”

Section: Schlosser and Croot Fe Solubility By Cross-flow Filtrationmentioning

confidence: 99%

“…The rate at which the colloid is deposited on the membrane can be written as (adapted from Soffer et al 2004): (6) where n uf is the number of moles of Fe deposited on the membrane, A is the area of the membrane, J is the permeate flux (L m -2 h -1 ), and J cr is the critical permeate flux (L m -2 h -1 ) below which no deposition can occur and is dependent on surface interactions.…”

Section: Schlosser and Croot Fe Solubility By Cross-flow Filtrationmentioning

confidence: 99%

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Application of cross‐flow filtration for determining the solubility of iron species in open ocean seawater

Schlösser

Croot

2008

Limnology & Ocean Methods

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Measurements of soluble iron species (organic and inorganic) are important for understanding the transport of iron within the ocean and its bioavailability. Recent developments in ultrafiltration equipment and analytical detection techniques for low level Fe determination has turned the spotlight on obtaining data on soluble iron species. However there have, until now, been few studies that have characterized the performance of an ultrafiltration system with respect to well described soluble iron complexes. In the present work, we describe a methodological study characterizing the behavior of soluble and colloidal iron species in seawater by combining a crossflow ultrafiltration system (Vivaflow 50 TM ) with a radioisotope ( 55 Fe). During this study, we were able to maintain excellent mass balances by including all components: not only the solution phases (retentate and permeate) but wall-adsorbed and filter-adsorbed iron, which were recovered by an acid-rinsing step. Wall and filter adsorption were unavoidable when solutions were saturated with respect to Fe'. However in undersaturated solutions, such as with an excess of desferrioxamine B, wall and filter adsorption were minimized, indicating that these effects should be slight for natural samples where iron-binding ligands are in excess. Our results have important implications for the use of ultrafiltration membranes for open ocean iron biogeochemical studies.

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“…Prior work on pre-coagulation during membrane filtration has revealed that when coagulation conditions are not optimal small colloidal and iron species are often present which are free to affect and clog the membrane, increasing the cleaning and running costs [6].…”

Section: Introductionmentioning

confidence: 99%

Process intensification during treatment of NOM-laden raw upland waters: Control and impact of the pre-coagulation regime during ultra-filtration

Hankins

Price

Debacher

2009

Desalination and Water Treatment

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A B S T R A C TThe use of upstream pre-coagulation coupled with downstream ultra-filtration (UF) has been applied to the clarification of natural organic matter (NOM) laden raw upland water. Such a combination yields a significant increase in possible loading rate and a decrease in the propensity for internal membrane fouling, allowing for an intensification of the process. In particular, the effect of controlling the pre-coagulation regime on the downstream UF has been investigated. It has been shown that zeta potential (ZP) can be used to detect changes in the coagulation process, and hence to determine appropriate dosage levels. This is important, as incomplete coagulation has a detrimental effect on UF membrane performance, particularly in terms of fouling caused by excess iron. Submerged hollow-fibre membrane units yield superior performance with precoagulation, and sufficient slow mixing of coagulant guarantees high permeate flow recovery after backwashing. Fouling by NOM can be remedied by conventional cleaning techniques. However, fouling due to excess iron can only be removed by heating the cleaning solution. The associated costs are thus twofold; that of excess coagulant and that of cleaning.

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Streaming potential and SEM-EDX study of UF membranes fouled by colloidal iron

Cited by 27 publications

References 8 publications

Electrokinetic characterization of poly(vinyl butyral) hollow fiber membranes by streaming potential and electroviscous effect

Electrokinetic characterization of poly(vinyl butyral) hollow fiber membranes by streaming potential and electroviscous effect

Application of cross‐flow filtration for determining the solubility of iron species in open ocean seawater

Process intensification during treatment of NOM-laden raw upland waters: Control and impact of the pre-coagulation regime during ultra-filtration

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