Cleaning results of new and fouled nanofiltration membrane characterized by contact angle, updated DSPM, flux and salts rejection

Al-Amoudi, Ahmed S.; Williams, Paul; Al-Hobaib, A. S.; Lovitt, Robert W.

doi:10.1016/j.apsusc.2007.12.052

Cited by 81 publications

(34 citation statements)

References 29 publications

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“…Thus, the cleaning procedure simulated in this study allows for a systematic examination of any changes in the membrane properties and separation efficiency without any interference of the foulant residues on the membrane surface. This cleaning protocol has been used successfully by several other research groups [15,[25][26][27]]. …”

Section: Filtration Protocolmentioning

confidence: 99%

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Effects of caustic cleaning on pore size of nanofiltration membranes and their rejection of trace organic chemicals

Simon

McDonald

Khan

et al. 2013

Journal of Membrane Science

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The aim of this study was to assess the impact of caustic cleaning on the rejection of three different trace organic chemical (TrOC) groups (i.e. neutral hydrophilic, neutral hydrophobic and negatively charged) by two nanofiltration (NF) membranes -namely NF270 and NF90. Chemical cleaning was simulated by exposing virgin membrane samples to commercial caustic cleaning formulations as well as sodium hydroxide solutions containing analytical grade additives such as sodium dodecyl sulfate or ethylenediaminetetraacetic acid. The membrane average pore size before and after exposure to a commercially available caustic cleaning formulation was determined based on the pore transport model. The results show that caustic chemical cleaning could cause an increase in the membrane pore size, leading to an increase in permeability and decrease in rejection of conductivity. The impact of caustic cleaning on the pore size and solute rejection was a function of the membrane active skin layer and the chemistry of the cleaning formulation. Caustic cleaning led to a small increase in pore size of the NF270 membrane and resulted in a notable increase in the permeability and salt passage. By contrast, the impact on the NF90 membrane was negligible. The influence of caustic cleaning on TrOC rejection was dependent on physical characteristics of each TrOC including their molecular size, charge, and hydrophobicity. The rejection of neutral and hydrophobic TrOC by the NF270 membrane decreased significantly after exposure to caustic cleaning formulation. However, because the rejection of negatively charged TrOC is governed mostly by electrostatic interaction, their rejection was not significantly affected by caustic cleaning.

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Section: Filtration Protocolmentioning

confidence: 99%

“…In fact, chemical cleaning with commercial caustic cleaning formulations, which usually contain a range of cleaning additives (i.e. surfactants and metal chelating reagents), have been often observed to recover the membrane flux to values above 100% of that achieved prior to cleaning [9,13,15,16].…”

Section: Introductionmentioning

confidence: 99%

Effects of caustic cleaning on pore size of nanofiltration membranes and their rejection of trace organic chemicals

Simon

McDonald

Khan

et al. 2013

Journal of Membrane Science

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“…Moreover, a separate issue is that membrane characteristics may vary with time over long term operation due to necessary cleaning operations [89,90]. Simon et al [91] showed that prolonged exposure of an NF membrane to acid and sodium dodecyl sulphate (SDS) rendered the membrane slightly less negatively charged.…”

Section: Surface Morphology and Microtopographymentioning

confidence: 99%

The role of cell-surface interactions in bacterial initial adhesion and consequent biofilm formation on nanofiltration/reverse osmosis membranes

Habimana

Semiao

Casey

2014

Journal of Membrane Science

233

113

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“…These values are slightly lower than obtained by us but close to them. On the other hand, other permeability value reported for this membrane is slightly higher, AlAmoudi et al gives 4.54·10 -11 ms -1 Pa -1 for a virgin HL thin-film membrane [77], this work does not specify the pre-treatment made to the membrane. In a previous work, García-Martín et al [74] have reported a L p value of 1.93·10 -11 m·s -1 Pa -1 for a similar membrane; but in that case with the configuration of a spiral-wound module.…”

Section: Retention Measurementsmentioning

confidence: 78%

“…This contribution provides additional characterization of this membrane on that presented by other authors (cleaning, zeta potential, permeability, contact angle and salts rejection) [76,77].…”

Section: Eriksson and Colleagues From Ge Infrastructure Water And Prmentioning

confidence: 99%

Pore size analysis from retention of neutral solutes through nanofiltration membranes. The contribution of concentration–polarization

et al. 2014

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Pore size distribution is one of the most important characteristics of a membrane.This can be obtained from the fitting of pore radius calculated from retention versus flux measurements for a set of solute solutions. In this work a set of non-charged similar molecules are chosen as solutes to minimize other interactions apart of those related to size. The hydrodynamic model will be used to characterize the behavior of the membrane to uncharged solutes, assuming that membrane pores are straight and cylindrical.As is known, the phenomenon of concentration polarization must be taken into account because true retention is not experimentally accessible by concentration measurements. Frequently, the film layer model is applied for the dependence of

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Cleaning results of new and fouled nanofiltration membrane characterized by contact angle, updated DSPM, flux and salts rejection

Cited by 81 publications

References 29 publications

Effects of caustic cleaning on pore size of nanofiltration membranes and their rejection of trace organic chemicals

Effects of caustic cleaning on pore size of nanofiltration membranes and their rejection of trace organic chemicals

The role of cell-surface interactions in bacterial initial adhesion and consequent biofilm formation on nanofiltration/reverse osmosis membranes

Pore size analysis from retention of neutral solutes through nanofiltration membranes. The contribution of concentration–polarization

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