Impact of chemical cleaning on properties and functioning of polyethersulfone membranes

Arkhangelsky, Elizabeth; Kuzmenko, Denis; Gitis, Vitaly

doi:10.1016/j.memsci.2007.08.007

Cited by 192 publications

(127 citation statements)

References 18 publications

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“…The relatively low manufacturing cost of polymeric membranes together with the easy processing of large-area membranes have led to a dominant position of polymeric membranes worldwide. Among the many polymers used as membrane materials, polyethersulfone (PES, see figure 1) is widely used to synthesize microfiltration and ultrafiltration membranes as PES has both excellent chemical and thermal resistances over a wide range of pH (from 1 to 13) [1][2][3]. However, PES is relatively hydrophobic and therefore additives such as polyvinylpyrrolidone (PVP, see figure 1) are usually blended with PES (without covalent bounds between the two polymers), in order to increase the membrane hydrophilicity.…”

Section: Introductionmentioning

confidence: 99%

“…Sodium hypochlorite is one of the most widely-used disinfecting/cleaning agents owing to its high efficiency and low cost [8][9][10]. However, it is well known that sodium hypochlorite has a strong impact on membranes properties such as structure [2,11,12], surface charge [2,13,14] and chemical composition [3,10,13,15], which directly impacts their filtration performance and their mechanical strength as well [3,15,16].…”

Section: Introductionmentioning

confidence: 99%

“…Several studies pointed out the occurrence of a PES-chain scission mechanism [2,3,10,13,14,21,22]. For PES (MW = 30,000 g mol -1 ) dense films containing small amounts of polyetherethersulfone (PEES), PES-chain scissions were observed after long term ageing (8 months) in 28,500 ppm total free chlorine (TFC) NaOCl solutions at pH 9 and 12 [23,24].…”

Section: Introductionmentioning

confidence: 99%

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Influence of PVP content on degradation of PES/PVP membranes: Insights from characterization of membranes with controlled composition

Kourde-Hanafi

Loulergue

Szymczyk

et al. 2017

Journal of Membrane Science

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Sodium hypochlorite is widely used to clean/sanitize PES/PVP membranes. However, this strong oxidant is responsible for accelerated polymer ageing, thus impairing PES/PVP membrane lifespan. This work aimed at getting a better understanding of the role of PVP in the degradation of PES/PVP membranes. As the precise chemical composition of commercial membranes is most often unknown, PES/PVP membranes with various PVP to PES ratios (from 0 to 44 wt %) were synthesized and aged dynamically by filtering sodium hypochlorite solutions. PVP oxidization and partial disappearance from the membrane matrix was observed whatever the membrane composition. Moreover, PES-chain scissions were put in evidence even for pure PES membranes, thus highlighting that PES degradation was not systematically related to the presence of PVP. Conversely, PES hydroxylation was observed only for membranes containing PVP, the hydroxylation rate being dependent on the PVP content. Interestingly, the occurrence of PES-chain scissions impacted the membrane

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of PVP content on degradation of PES/PVP membranes: Insights from characterization of membranes with controlled composition

Kourde-Hanafi

Loulergue

Szymczyk

et al. 2017

Journal of Membrane Science

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“…At each value of T, increase in pH results in permeate flux increase. Effect of T on permeate flux is not significant due to the low susceptibility of polyamide membrane to structural variations in response to change in temperature [16].…”

Section: A Optimization Of Mfmentioning

confidence: 99%

MF as Pretreatment of RO for Tertiary Treatment of Biologically Treated Distillery Spentwash

Sharma¹,

Joshi²

2016

IJESD

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Abstract-Biologically treated spentwash from distillery usually contains high chemical oxygen demand (COD), biological oxygen demand (BOD), color, total dissolved solids (TDS) and other contaminants. In India, reverse osmosis (RO) treatment plants have been installed in many of the distilleries at tertiary treatment, but are not properly working due to fouling problem. To make the membrane process proven and reliable technology, proper pre-treatment is mandatory which not only improve quality of RO permeate but also increase life of RO. In the present study, use of micro-filtration (MF) for pre-treatment of RO has been evaluated at the tertiary treatment stage. Experiments were optimized in terms of different operating parameters viz. initial pH (pH o : 2-10), trans-membrane pressure (1-5 bars) and temperature (15-43°C). Experimental data revealed that the MF could be an effective pre-treatment in removing the pollutants (COD, color and TOC) and improving performance and water recovery (permeate flux) in comparison to RO alone. Removal efficiency for COD, color, TDS and TOC was observed as 31.5%, 42.7% and 27.6% with MF, respectively at optimized conditions with increased permeate flux from 17. LPH (RO) to 32 LPH (MF-RO).Index Terms-Bio-digested distillery spentwash, life cycle assessment, pre-treatment, reverse osmosis, response surface methodology, micro-filtration.

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“…Membrane filtration experiments were performed in a dead-end lab-scale stirred cell 23 at 1 bar transmembrane pressure (TMP). The experiments were performed immediately after flocculation stages (i) and (ii).…”

Section: The Experimentsmentioning

confidence: 99%

Cleaning secondary effluents with organoclays and activated carbon

Siebdrath

Ziskind

Gitis

2011

J of Chemical Tech & Biotech

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Impact of chemical cleaning on properties and functioning of polyethersulfone membranes

Cited by 192 publications

References 18 publications

Influence of PVP content on degradation of PES/PVP membranes: Insights from characterization of membranes with controlled composition

Influence of PVP content on degradation of PES/PVP membranes: Insights from characterization of membranes with controlled composition

MF as Pretreatment of RO for Tertiary Treatment of Biologically Treated Distillery Spentwash

Cleaning secondary effluents with organoclays and activated carbon

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