Ageing of polyethersulfone ultrafiltration membranes in hypochlorite treatment

Thominette, F.; Farnault, Olivier; Gaudichet‐Maurin, Emmanuelle; Machinal, Claire; Schrotter, Jean‐Christophe

doi:10.1016/j.desal.2006.03.221

Cited by 33 publications

(25 citation statements)

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“…One of the most popular cleaning agents, sodium hypochlorite [5], is very successful in restoration and sometimes even growth of the permeate flux [6]. A more detailed investigation revealed that the increase comes on the expenses of the polymer chain breakage [7][8][9][10][11][12]. The breakage is held responsible for the expansion of the membrane pore size [7,13], changes in membrane hydrophilicity [13], increased streaming potential [14], and deteriorated mechanical strength [15,16].…”

Section: Introductionmentioning

confidence: 96%

Understanding the oxidative cleaning of UF membranes

Levitsky

Duek

Arkhangelsky

et al. 2011

Journal of Membrane Science

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Section: Introductionmentioning

confidence: 96%

Understanding the oxidative cleaning of UF membranes

Levitsky

Duek

Arkhangelsky

et al. 2011

Journal of Membrane Science

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“…However this polymer being quite hydrophobic, the addition of a more hydrophilic polymer such as poly(N-vinylpyrrolidone) (PVP) in the dope has then become a standard method to increase water permeability and lower the membrane propensity to fouling. The studies concerning the role played by sodium hypochlorite on PES Ultrafiltration membranes [4][5][6][7][8][9][10][11][12][13] mainly focus on changes in the macromolecular chemical composition, hydrophilic character, permeability and mechanical properties. However, the impact of NaClO on membrane selectivity by means of tracer's retention measurements (and selectivity curve determination) has not been thoroughly investigated and understood.…”

Section: Introductionmentioning

confidence: 99%

Filtration performance and pore size distribution of hypochlorite aged PES/PVP ultrafiltration membranes

Pellegrin

Mezzari

Hanafi

et al. 2015

Journal of Membrane Science

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International audienceThe objective of the present work is to correlate the evolution of membrane characteristics due to contact with hypochlorite used as cleaning agent to its selectivity towards model solutes. Accelerated ageing experiments were performed by soaking the membrane at ambient temperature in hypochlorite solutions. The total free chlorine concentration of these solutions was fixed at 350 ppm and the pH at 8. The model solute selected was T500 Dextran. The experimental results demonstrated that hypochlorite induced membrane degradation, on one hand modified the solutes–membrane interactions increasing irreversible fouling and, on the other hand, lowered the selectivity. These results have been correlated with the modification of the pore size distribution following a protocol in which fouling did not affect membrane characterization. The most probable scenario of distribution evolution over degradation process was an increase of the pore radius of the initial population, accompanied by a decrease in their number, coupled with the appearance of defects, whose radius increased with the progress of the degradation

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“…Unfortunately, such oxidants are the main causes of deterioration in the membrane integrity [316], whereby prolonged exposure causes oxidative damage to the membrane [317], which accelerates membrane ageing and degradation that in turn not only leads to discoloration of the membrane fibers, but also embrittlement of the fibers that subsequently increases the likelihood of membrane-fiber fracture [316,318,319]. The embrittlement rate for hollow fibers has been found to be four times that of flat-sheet membranes [309].…”

Section: Chemical Oxidationmentioning

confidence: 99%

“…Membrane ageing of commonly used composite membranes is defined as the deterioration of the surface layer and sub-layers of membranes due to the irreversible deposition of foulants or by frequent exposure to chemical cleaning agents, which leads to the deterioration of the membrane performance [308,309]. While the active layer of the membrane has been found to be chemically modified, pore reduction has been found in the intermediate sublayer (i.e., between the active layer and the porous support) [308].…”

Section: Ageingmentioning

confidence: 99%

The Performance and Fouling Control of Submerged Hollow Fiber (HF) Systems: A Review

et al. 2017

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Abstract:The submerged membrane filtration concept is well-established for low-pressure microfiltration (MF) and ultrafiltration (UF) applications in the water industry, and has become a mainstream technology for surface-water treatment, pretreatment prior to reverse osmosis (RO), and membrane bioreactors (MBRs). Compared to submerged flat sheet (FS) membranes, submerged hollow fiber (HF) membranes are more common due to their advantages of higher packing density, the ability to induce movement by mechanisms such as bubbling, and the feasibility of backwashing. In view of the importance of submerged HF processes, this review aims to provide a comprehensive landscape of the current state-of-the-art systems, to serve as a guide for further improvements in submerged HF membranes and their applications. The topics covered include recent developments in submerged hollow fiber membrane systems, the challenges and developments in fouling-control methods, and treatment protocols for membrane permeability recovery. The highlighted research opportunities include optimizing the various means to manipulate the hydrodynamics for fouling mitigation, developing online monitoring devices, and extending the submerged HF concept beyond filtration.

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Ageing of polyethersulfone ultrafiltration membranes in hypochlorite treatment

Cited by 33 publications

References 0 publications

Understanding the oxidative cleaning of UF membranes

Understanding the oxidative cleaning of UF membranes

Filtration performance and pore size distribution of hypochlorite aged PES/PVP ultrafiltration membranes

The Performance and Fouling Control of Submerged Hollow Fiber (HF) Systems: A Review

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