Modification of membrane surfaces via microswelling for fouling control in drinking water treatment

Du, Jennifer Runhong; Peldszus, Sigrid; Huck, Peter M.; Feng, Xinbin

doi:10.1016/j.memsci.2014.10.040

Cited by 42 publications

(17 citation statements)

References 41 publications

(43 reference statements)

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“…However, membrane fouling during the separation process has inevitably hinders their practical applications, which is mainly caused by adsorption of living organisms, particulates or colloids [3,4]. Therefore, it is a significant scientific issue to improve the antifouling capability of polymeric membranes.…”

Section: Introductionmentioning

confidence: 99%

Surface modification of polypropylene microfiltration membrane by grafting poly(sulfobetaine methacrylate) and poly(ethylene glycol): Oxidative stability and antifouling capability

Ren

Fang

Wan

et al. 2015

Journal of Membrane Science

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Section: Introductionmentioning

confidence: 99%

Surface modification of polypropylene microfiltration membrane by grafting poly(sulfobetaine methacrylate) and poly(ethylene glycol): Oxidative stability and antifouling capability

Ren

Fang

Wan

et al. 2015

Journal of Membrane Science

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“…The consequence of these pronounced surface defects on membranes should not be neglected since it is unclear how these might contribute to the rate of bacterial adhesion and potentially the characteristics of the subsequent biofilm. This work provides a framework by which novel membranes with deliberate micro-topographical modification [25,27,28,[30][31][32], can be assessed from the point of view of early stage biofouling.…”

Section: Introductionmentioning

confidence: 99%

Nanofiltration and reverse osmosis surface topographical heterogeneities: Do they matter for initial bacterial adhesion?

Allen

Semiao

Habimana

et al. 2015

Journal of Membrane Science

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The role of the physicochemical and surface properties of NF/RO membranes influencing bacterial adhesion has been widely studied. However, there exists a poor understanding of the potential role membrane topographical heterogeneities can have on bacterial adhesion. Heterogeneities on material surfaces have been shown to influence bacterial adhesion and biofilm development. The purpose of this study was therefore to investigate whether the presence of membrane topographical heterogeneities had a significant role during bacterial adhesion as this could significantly impact on how biofouling develops on membranes during NF/RO operation. An extensive study was devised in which surface topographical heterogeneities from two commercial membranes, NF270 and BW30, were assessed for their role in the adhesion of two model organisms of different geometrical shapes, Pseudomonas fluorescens and Staphylococcus epidermidis. The influence of cross-flow velocity and permeate flux was also tested, as well as the angle to which bacteria adhered compared to the flow direction. Bacterial adhesion onto the membranes and in their surface topographical heterogeneities was assessed using Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), fluorescence microscopy and image analysis. Results showed that up to 30% of total adhered cells were found in membrane defect areas when defect areas only covered up to 13% of the membrane surface area. This suggests that topographical heterogeneities may play a significant role in establishing environmental niches during the early stages of biofilm development. Furthermore, no noticeable difference between the angle of cell attachment in defect areas compared to the rest of the membrane surface was found.

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“…There are four reasons that could explain the performance enhancement of the PPy modified membrane in this study: (1) the hydrophilicity of the modified membrane was enhanced and this was good for membrane fouling mitigation during filtration; 26 (2) the roughness of the modified membrane was reduced, which also benefitted anti fouling of the membrane; 27 (3) narrow pore size distribution prevented foulants from entering the pores more effectively and further mitigate membrane fouling, 15,28 which enhanced the foulants rejection and reduced the turbidity of the effluent; (4) more negative charge on membrane surface inhibited the adsorption of negatively charged foulants on the membrane during filtration, 29,30 as the Zeta potential of yeast solution was -38.3 ± 0.41 mV 8 and the Zeta potential of the modified membrane surface was about -20 mV for pH 6 ∼ 8 (Fig. 2).…”

Section: Short-term Filtration Testsmentioning

confidence: 85%

Polypyrrole vapor phase polymerization on PVDF membrane surface for conductive membrane preparation and fouling mitigation

Liu

Tian

Xiong

et al. 2017

J of Chemical Tech & Biotech

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BACKGROUND Conductive membranes, such as carbon material modified membrane and nickel metal film could be used for membrane fouling mitigation and energy generation during filtration. However, it is necessary to simplify the preparation process and reduce the cost for practical application. Here, a conducting polymer polypyrrole was polymerized on PVDF membrane surface for conductive membrane preparation via vapor phase polymerization. RESULTS After modification, the pure water flux was reduced from 3393.26 ± 222.99 L m‐2 h‐1 to 569.48 ± 150.82 L m‐2 h‐1. The contact angle was 58.63° for blank membrane after 8 s of delay, which was reduced to 27.53° for modified membrane. During short‐term filtration, the modified membrane maintained high, stable flux and low effluent turbidity. The fouling of conductive membrane can be mitigated by 1 V cm‐1 of electric filed during long‐term filtration. Better effluent properties were obtained from modified membrane, which were improved further when an electric field was applied. CONCLUSION It is concluded that the conductive membrane has a smoother and more hydrophilic surface, resulting in better anti‐fouling and effluent properties with the assistance of an electric field. © 2017 Society of Chemical Industry

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Modification of membrane surfaces via microswelling for fouling control in drinking water treatment

Cited by 42 publications

References 41 publications

Surface modification of polypropylene microfiltration membrane by grafting poly(sulfobetaine methacrylate) and poly(ethylene glycol): Oxidative stability and antifouling capability

Surface modification of polypropylene microfiltration membrane by grafting poly(sulfobetaine methacrylate) and poly(ethylene glycol): Oxidative stability and antifouling capability

Nanofiltration and reverse osmosis surface topographical heterogeneities: Do they matter for initial bacterial adhesion?

Polypyrrole vapor phase polymerization on PVDF membrane surface for conductive membrane preparation and fouling mitigation

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