Effects of fractal roughness of membrane surfaces on interfacial interactions associated with membrane fouling in a membrane bioreactor

Feng, Shushu; Yu, Genying; Cai, Xiang; Eulade, Mahoro; Lin, Hongjun; Chen, Jianrong; Liu, Yong; Liao, Baoqiang

doi:10.1016/j.biortech.2017.07.160

Cited by 40 publications

(13 citation statements)

References 49 publications

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“…It is generally accepted that, adhesion of various foulants (colloids, soluble microbial products, extracellular polymeric substances, and sludge flocs cell) in feed water on membrane surface is the main cause of membrane fouling . Increase in roughness of membrane surfaces would strengthen and prolong the interfacial interactions between membranes and foulants and would significantly increase the adhesion propensity of a foulant particle on a rough membrane surface, enhancing membrane fouling . Accordingly, it is not surprising that the unmodified PAS and PAE membranes displayed better antifouling ability.…”

Section: Resultsmentioning

confidence: 99%

“…56,57 Increase in roughness of membrane surfaces would strengthen and prolong the interfacial interactions between membranes and foulants and would significantly increase the adhesion propensity of a foulant particle on a rough membrane surface, enhancing membrane fouling. [58][59][60] Accordingly, it is not surprising that the unmodified PAS and PAE membranes displayed better antifouling ability. High pure water flux of the modified PAS and PAE with PVP make them more sensitive to fouling process and fouling in same extent of other polymers has a remarkable effect on flux of high permeation membranes (PAS + PVP and PAE + PVP).…”

Section: Antifouling Properties Of the Membranesmentioning

confidence: 99%

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Structural manipulation of PES constituents to prepare advanced alternative polymer for ultrafiltration membrane

Rezania

Vatanpour

Arabpour

et al. 2019

J of Applied Polymer Sci

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Polyethersulfone (PES) is the most well‐known polymer for the preparation of ultrafiltration (UF) membrane, but its membrane suffers from fouling. In this study, two engineered polymers were synthesized to provide optimal antifouling properties for UF membranes that simultaneously benefit from good properties of polyamide and PES. The choice of polyamide is due to its prominent characteristics and the convenience of its synthesis with various functional groups in a cost‐effective way. Two hydroxyl containing polyamide bearing sulfone groups (PAS) and ether group (PAE) were synthesized by polycondensation method. The UF membranes were fabricated using the phase inversion method via immersion precipitation of PAS, PAE, and PES in dimethylacetamide, as a solvent and water, as a nonsolvent. The obtained membranes were compared and characterized by means of atomic force microscopy, scanning electron microscopy, contact angle, and Fourier transform infrared spectroscopy in the attenuated total reflection mode. The performance of membranes illustrated that the PAS and PAE membranes in comparison with the PES membrane had better porosity, water permeability, lesser protein fouling, more vertically finger‐like pores, and more hydrophilic surface. The water permeability of PES, PAE, and PAS was 7.3, 64.0, and 78.0 L m−2 h−1 while their flux recovery ratio was 59.4, 83.3, and 86.7%, respectively. The promising permeability and antifouling properties of the PAS are potentially applicable in the efficient industrial separation and wastewater treatment. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 137, 48690.

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Section: Resultsmentioning

confidence: 99%

Section: Antifouling Properties Of the Membranesmentioning

confidence: 99%

Structural manipulation of PES constituents to prepare advanced alternative polymer for ultrafiltration membrane

Rezania

Vatanpour

Arabpour

et al. 2019

J of Applied Polymer Sci

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“…The membrane-foulant covalent complexation could be alleviated by reducing the density of carboxyl groups on the membrane surface (Mo et al, 2012;Han et al, 2016). The spatial effects could be regulated by changing the pore morphology (Xiao et al, 2014a;Fan et al, 2018), surface roughness (Hashino et al, 2011;Feng et al, 2017), and surface topography of the membrane (e.g., prism/pyramid/embossing-patterned membranes Won et al, 2016 and hierarchically textured membranes Zhao et al, 2018). In addition, electrocatalytic membranes have been developed to produce reactive species (such as hydroxyl radicals) on the membrane surface in situ, thus breaking the membrane-foulant interactions (Yang Y. et al, 2011;Yang et al, 2012;Zheng et al, 2018).…”

Section: Membrane Modification For Tuning the Membrane-foulant Interamentioning

confidence: 99%

Outlining the Roles of Membrane-Foulant and Foulant-Foulant Interactions in Organic Fouling During Microfiltration and Ultrafiltration: A Mini-Review

Xiao

Wang

et al. 2020

Front. Chem.

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Membrane fouling remains a notorious problem in microfiltration (MF) and ultrafiltration (UF), and a systematic understanding of the fouling mechanisms is fundamental for solving this problem. Given a wide assortment of fouling studies in the literature, it is essential that the numerous pieces of information on this topic could be clearly compiled. In this review, we outline the roles of membrane-foulant and foulant-foulant intermolecular interactions in MF/UF organic fouling. The membrane-foulant interactions govern the initial pore blocking and adsorption stage, whereas the foulant-foulant interactions prevail in the subsequent build-up of a surface foulant layer (e.g., a gel layer). We classify the interactions into non-covalent interactions (e.g., hydrophobic and electrostatic interactions), covalent interactions (e.g., metal-organic complexation), and spatial effects (related to pore structure, surface morphology, and foulants size for instance). They have either short-or long-range influences on the transportation and immobilization of the foulant toward the membrane. Specifically, we profile the individual impacts and interplay between the different interactions along the fouling stages. Finally, anti-fouling strategies are discussed for a targeted control of the membrane-foulant and foulant-foulant interactions.

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“…The surface roughness of membranes, and indeed any other surface, plays a major role in modulating interactions between the surface and surrounding medium, and hence plays a major role in fouling and biofouling [29][30][31][32][33][34][35][36][37]. This is primarily due to roughness changing the surface area and texture available to be fouled [38], as well as affecting the water contact angle [39,40], acid-base interactions [33] and also the surface zeta-potential [41].…”

Section: Introductionmentioning

confidence: 99%

“…Much of the study of such surfaces have been in the fields of crack propagation and growth of metal films, as well as some other materials. Recently it has been reported by both Zhang et al [67] and Feng et al [32] that polymer membrane surfaces with random roughness can be modelled using fractal functions. In addition, Wong et al [41] examined surface roughness of a wide variety of membranes and found that their behaviour could be described using fractal geometry, with linear growth of logarithmic plots of roughness versus scan size.…”

Section: Introductionmentioning

confidence: 99%

Polymer membranes – Fractal characteristics and determination of roughness scaling exponents

Johnson

Hilal

2019

Journal of Membrane Science

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Surface roughness is a parameter widely reported when characterising membrane surfaces, due to its effect on membrane properties, such as fouling / biofouling and wetting. However, a surface does not have a single roughness value, rather the magnitude of measured roughness is dependent on the length scales of measurement. Here, we report findings from roughness measurements of several commercial filtration membrane surfaces using atomic force microscopy. All membranes showed selfaffine behaviour at scan sizes below approximately 10 μm, where the magnitude of root mean squared roughness, R q , was described by both the scan length and an exponential factor, H. Furthermore, we show that values of H can be obtained from power spectra of AFM images using a relatively simple approach. Using values of H and R q obtained at a single scan size from image power spectra allowed us to estimate, within reasonable error, R q values at other scan size, below a cross-over length. Above this crossover length roughness scaling was linear, rather than exponential for the membranes studied.

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Effects of fractal roughness of membrane surfaces on interfacial interactions associated with membrane fouling in a membrane bioreactor

Cited by 40 publications

References 49 publications

Structural manipulation of PES constituents to prepare advanced alternative polymer for ultrafiltration membrane

Structural manipulation of PES constituents to prepare advanced alternative polymer for ultrafiltration membrane

Outlining the Roles of Membrane-Foulant and Foulant-Foulant Interactions in Organic Fouling During Microfiltration and Ultrafiltration: A Mini-Review

Polymer membranes – Fractal characteristics and determination of roughness scaling exponents

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