Effects of hydrophilicity/hydrophobicity of membrane on membrane fouling in a submerged membrane bioreactor

Zhang, Meijia; Liao, Baoqiang; Zhou, Xiaoling; He, Yiming; Hong, Huachang; Lin, Hongjun; Chen, Jianrong

doi:10.1016/j.biortech.2014.10.058

Cited by 151 publications

(38 citation statements)

References 35 publications

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“…A rapid rise in pressure indicated that the membrane surface was clogged by soluble foulants such as soluble microbial products (SMPs). This was also indicated in a fouling study conducted in a submerged MBR [29].…”

Section: Flux Pressure Profilessupporting

confidence: 55%

“…In a membrane fouling study, it is suggested that increasing surface hydrophilicity cannot mitigate membrane fouling in MBRs [29]. High zeta potential and roughness of membranes alleviate membrane fouling, as stated earlier [29]. Therefore, the PES membranes used in this study are not proper for an MBR filtration of OIZ wastewater, as they show high potential of fouling.…”

Section: Flux Pressure Profilesmentioning

confidence: 78%

“…The easier cleaning of the cake layer can be related to the hydrophobic nature of the membrane. In a membrane fouling study, it is suggested that increasing surface hydrophilicity cannot mitigate membrane fouling in MBRs [29]. High zeta potential and roughness of membranes alleviate membrane fouling, as stated earlier [29].…”

Section: Flux Pressure Profilesmentioning

confidence: 88%

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Effect of Membrane Type for the Treatment of Organized Industrial Zone (OIZ) Wastewater with a Membrane Bioreactor (MBR): Batch Experiments

Özkan

Uyanik

2017

Water

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Organized industrial zone (OIZ) wastewater is a mixed wastewater that is contributed by both municipal use and from different industrial sectors. Since MBR has advantages over conventional treatment plants, membrane types and fouling become the most important parameters in the treatment of this kind of wastewater. In this study, six different membrane types were used to find the most suitable membrane with the least resistivity to fouling. Three different microfiltration (MF) and ultrafiltration (UF) membranes were operated to estimate their (i) membrane, (ii) cake, (iii) pore, and (iv) total resistances. The highest total resistance was observed in a polyethersulfone (PES) membrane (3.8 × 10 10 m −1 ), while the lowest one was a UF polyvinylidene fluoride (PVDF) membrane with approximately 20 times lower resistance than the highest one. PVDF membranes showed lower total resistances than PES membranes. An MF or a 250 kDa UF membrane could be operated long-term in a membrane bioreactor with the least fouling potential.

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Section: Flux Pressure Profilessupporting

confidence: 55%

Section: Flux Pressure Profilesmentioning

confidence: 78%

See 1 more Smart Citation

Effect of Membrane Type for the Treatment of Organized Industrial Zone (OIZ) Wastewater with a Membrane Bioreactor (MBR): Batch Experiments

Özkan

Uyanik

2017

Water

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“…Good control of the membrane surface characteristics is important in minimising the deposition of solutes. The formation of polyelectrolyte multilayers, preferably with a negatively charged surface, can possibly reduce the solute deposition phenomenon observed, owing to an improved repulsion capability [37]. In addition, lower water permeation through the pores of modified membranes also reduces the number of humic acid solutes that come closer to the membrane surfaces, which minimises the amount of humic acid solutes deposited onto the membrane surface.…”

Section: Membrane Retention Capabilitymentioning

confidence: 99%

Development of a nanofiltration membrane for humic acid removal through the formation of polyelectrolyte multilayers that contain nanoparticles

Mohammad

Rohani³

et al. 2016

Desalination and Water Treatment

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A B S T R A C TPoly(sodium-4-styrenesulphonate) (PSS) and poly(diallyldimethylammonium chloride) have been employed to construct polyelectrolyte multilayers on a polyethersulphone substrate for use in the nanofiltration of humic acid. Self-synthesised Ag 2 O and commercial ZnO nanoparticles were incorporated into the multilayers separately, showing increases in the permeability from 7.53 ± 1.83 to 8.39 ± 1.37 and 8.62 ± 1.03 L m −2 h −1 bar −1 , respectively, with no significant leaching observed in the permeates. All polyelectrolyte-modified membranes exhibited good film-formation stabilities and high humic acid retention capabilities, which ranged from 93.14 ± 2.43 to 95.57 ± 3.87%. Less humic acid solutes were deposited onto the surface of the polyelectrolyte-modified membrane, which was confirmed through field emission scanning electron microscopy images. The contact angle was reduced from 44.00 ± 3.46˚to 39.10 ± 3.47˚when the membrane surface was hydrophilised with PSS as the terminating layer.

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“…Membrane fouling would affect the overall membrane performance including lower plant productivity, frequent membrane cleaning, increased membrane replacement cost, and higher energy requirement for aeration [15]. To alleviate membrane fouling, several approaches have been investigated including optimization of operating conditions [16,17], addition of coagulants [18], relaxation and backwashing [19], alteration of membrane properties [20], and modification of MBR configuration [21]. Among which applying electricity into MBR to attain electrically-enhanced MBR (EMBR) was researched intensively [22,23].…”

Section: Introductionmentioning

confidence: 99%

An Overview of Electrically-enhanced Membrane Bioreactor (EMBR) for Fouling Suppression

Ho¹,

Teow²,

Ang³

et al. 2017

JESTR

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Membrane fouling is the major challenges that hinders the widespread application of membrane bioreactor (MBR). Recently, application of electricity in electrically-enhanced MBR (EMBR) to suppress membrane fouling has gained much attention among research communities. This paper presents an overview of developments on EMBR for fouling suppression in wastewater treatment. The flow of electricity has stimulated several electrokinetic processes including electrophoresis/electrochemical process, and electrocoagulation which are the major fouling suppression mechanisms employed in EMBR. In electrophoresis, the membrane fouling is suppressed by the increased electrorepulsive force between negatively-charged foulants and cathode membrane under the influence of an electric field. Besides, electric field also induces simultaneous electrochemical oxidation and reduction which generate chemicals to degrade pollutant in wastewater. On top of that, use of active anode is reminiscent of electrocoagulation which produces cation coagulants in EMBR that capable to neutralize charge of the foulants and promotes flocs formation. This increases flocs size and sedimentation rate thereafter reduces adhesion of foulants on the membrane surface. Lastly, bioelectricity generation of microbial fuel cell (MFC) integrated with MBR to attain self-sustained EMBR has been studied. Self-sustained EMBR combines the advantages of MFC and MBR in treating wastewater and energy recovery simultaneously. Overall, it is evidenced that MBR and electrokinetic processes have a synergetic enhancement effect in EMBR system.

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Effects of hydrophilicity/hydrophobicity of membrane on membrane fouling in a submerged membrane bioreactor

Cited by 151 publications

References 35 publications

Effect of Membrane Type for the Treatment of Organized Industrial Zone (OIZ) Wastewater with a Membrane Bioreactor (MBR): Batch Experiments

Effect of Membrane Type for the Treatment of Organized Industrial Zone (OIZ) Wastewater with a Membrane Bioreactor (MBR): Batch Experiments

Development of a nanofiltration membrane for humic acid removal through the formation of polyelectrolyte multilayers that contain nanoparticles

An Overview of Electrically-enhanced Membrane Bioreactor (EMBR) for Fouling Suppression

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