In-situ healing of damaged polyethersulfone ultrafiltration membranes with microgels

Zhu, Shaoxiong; Li, Jiaqi; Dong, Shunni; Ji, Wei; Nie, Jun; Zhu, Liping; Du, Binyang

doi:10.1016/j.memsci.2022.120313

Cited by 16 publications

(9 citation statements)

References 26 publications

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“…Hence, the presented results indicate that the addition of PVP, which improves the performance of PES membranes, may also limit the scope of their application. It has been shown that damage in PES membranes can be repaired using a colloidal gel solution, which was entrapped in the damaged site after filtration deposition [20]. Microgel-healed PES UF membranes are additionally resistant to cyclic washing with NaOH solutions.…”

Section: Introductionmentioning

confidence: 99%

The Resistance of Polyethersulfone Membranes on the Alkaline Cleaning Solutions

Gryta,

Woźniak

2024

Membranes

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Polyethersulfone (PES) is a polymer popularly used to produce ultrafiltration (UF) membranes. PES is relatively hydrophobic; thus, hydrophilic ingredients are added to the membrane matrix to reduce the fouling intensity. Ingredients such as polyvinylpyrrolidone (PVP) reduce the resistance of PES to NaOH solutions. This study investigated the possibility of using PES membranes for the separation of alkaline cleaning solutions. For this purpose, self-made PES membranes and commercial ultrafiltration PES membranes (UE10—10 kDa and UE50—100 kDa) containing PVP additive were used. The membranes were soaked for 18 months in alkaline (pH = 11.3–11.5) solutions of car washing fluids. It has been found that long-term contact with these solutions caused changes in the structure of the surface layer, especially of membranes containing PVP. As a result, the separation of dextran (100–200 kDa) decreased by 30–40% for PES membranes, 30–40% for UE10 and 40–60% for UE50. Despite these changes, the separation efficiency (rejection of COD, NTU and anionic surfactants) of synthetic car wash wastewater (mixture of surfactants and hydrowax) was similar to the results obtained for pristine membranes.

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Section: Introductionmentioning

confidence: 99%

The Resistance of Polyethersulfone Membranes on the Alkaline Cleaning Solutions

Gryta,

Woźniak

2024

Membranes

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“…During the filtration of surfactant solutions, this was explained by the concentration polarization, especially at higher fluxes [40]. Increasing the surfactant concentration in the polarization layer in the vicinity of the membrane surface can lead to monomer and micellar formation, and as a result, the PES 30 kDa membrane removed 60-80% of the anionic surfactants, similar to the PES 10 kDa [41]. Similarly to dextrans, the ingredients present in car wash wastewater also cause fouling, which affects membrane performance [13].…”

Section: The Influence Of Cleaning Agents On the Performance Pes Memb...mentioning

confidence: 99%

Effects of Alkaline Cleaning Agents on the Long-Term Performance and Aging of Polyethersulfone Ultrafiltration Membranes Applied for Treatment of Car Wash Wastewater

Gryta,

Woźniak,

Mozia

2024

Membranes

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The commercial ultrafiltration polyethersulfone (PES) membranes (10 and 100 kDa) blended with polyvinylpyrrolidone (PVP) were applied for the filtration of car wash wastewater. Periodical membrane rinsing with water did not prevent fouling and a decrease in permeate flux was observed. Fouling was reduced by washing the membranes with cleaning agents, which are used in car washes to clean wheels and remove insects. In addition to surfactants, these agents contain NaOH, hence the pH value of cleaning solutions was over 11. Long-term contact with such solutions resulted in the removal of PVP from the membrane matrix and an increase in pore size. The PES membranes were soaked in an alkaline solution (pH = 11.5) for 20 months, after which the 200 kDa dextran rejection decreased from 95% to 80%. To compare with the static degradation conditions, 8 weeks of alkaline agent filtration was realized, after which the dextran (200 kDa) rejection decreased below 50%. This indicated that the cross-flow of alkaline agents can accelerate the removal of components building the membrane matrix. Despite membrane degradation, the separation efficiency (the rejection of chemical oxygen demand—COD, turbidity, and surfactants) during the treatment of synthetic car wash wastewater was similar to that obtained for pristine membranes.

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“…In terms of adsorption and the absorption of Bengal rose molecules, it is superior to existing MOFs. The adsorption capacity remained high even after three adsorption–desorption cycles, and a membrane adsorber was prepared based on the growth of Sm-BTC crystals in the matrix of three porous polymer materials (nylon, 49 polyethersulfone 50 and polytetrafluoroethylene 51 ). The Sm-BTC supported by nylon showed the highest adsorption performance, which may be due to the uniform distribution of crystals in the scaffold (Fig.…”

Section: Synthesismentioning

confidence: 99%