Fouling and Cleaning in Osmotically Driven Membranes

Chollom, Martha Noro; Rathilal, Sudesh

doi:10.5772/intechopen.73047

Cited by 7 publications

(5 citation statements)

References 66 publications

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“…Overall, it can be conducted that the fabricated modified membranes show higher permeability as compared to the plain PVDF membrane (M-Ref), which remains as the lowest value of permeability throughout the filtration. [39], the membrane with highest flux has a high tendency to suffer from more severe membrane fouling because of the great convective force which consequently brings foulants to the membrane surface. The finding demonstrates the advantage of high hydrophilicity posed by M-5 to allow it to maintain high permeability by water flushing as a simple operation for membrane fouling control.…”

Section: Permeance Recovery Analysismentioning

confidence: 99%

Polyvinylidene Fluoride Membrane Via Vapour Induced Phase Separation for Oil/Water Emulsion Filtration

et al. 2021

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Membrane-based technology is an attractive option for the treatment of oily wastewater because of its high oil removal efficiency, small footprint and operational simplicity. However, filtration performance is highly restricted by membrane fouling, especially when treating oil/water emulsion as a result of strong interaction between oil droplets and the hydrophobic property of the membrane. This study explores the fabrication of polyvinylidene fluoride (PVDF)-based membrane via the vapour induced phase separation (VIPS) method while incorporating polyvinyl pyrrolidone (PVP) as a hydrophilic additive to encounter membrane fouling issues and improve membrane filterability. The resulting membranes were characterized and tested for oil/water emulsion filtration to evaluate their hydraulic, rejection and anti-fouling properties. Results show that the changes in membrane morphology and structure from typical macrovoids with finger-like substructure to cellular structure and larger membrane pore size were observed by the prolonged exposure time from 0 to 30 min through the VIPS method. The enhanced clean water permeability is attributed to the addition of PVP–LiCl in the dope solution that enlarges the mean flow pore size from 0.210 ± 0.1 to 7.709 ± 3.5 µm. The best performing membrane was the VIPS membrane with an exposure time of 5 min (M-5), showing oil/water emulsion permeability of 187 Lm−2 h−1 bar−1 and oil rejection of 91.3% as well as an elevation of 84% of clean water permeability compared to pristine PVDF developed using a typical non-solvent induced phase separation (NIPS) method. Despite the relatively high total fouling, M-5 was able to maintain its high permeability by water flushing as a simple operation for membrane fouling control. The performance was achieved thanks to combination of the large mean flow pore size and hydrophilic property from residual PVP in the membarne matrix. Overall, the results demonstrate the potential of the optimum VIPS method in the presence of PVP and LiCl additives for oil/water emulsion treatment.

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Section: Permeance Recovery Analysismentioning

confidence: 99%

Polyvinylidene Fluoride Membrane Via Vapour Induced Phase Separation for Oil/Water Emulsion Filtration

et al. 2021

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“…The antifouling surface is then coupled with high porosity and the least thickness to offer a better permeability compared to other membranes. In the meantime, studies show that membrane with higher flux most probably suffers from more severe membrane fouling due to the greater convective force that brings about foulants to the membrane surface [50]. However, despite relatively high permeability shown by PVDF/PEG-30, it exhibited a high permeability recovery of 37% at the fifth filtration cycle that delays the effect of membrane fouling.…”

Section: Permeance Recovery Analysismentioning

confidence: 99%

Development of Hydrophilic PVDF Membrane Using Vapour Induced Phase Separation Method for Produced Water Treatment

et al. 2020

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During the production of oil and gas, a large amount of oily wastewater is generated, which would pollute the environment if discharged without proper treatment. As one of the most promising treatment options, membrane material used for oily wastewater treatment should possess desirable properties of high hydraulic performance combined with high membrane fouling resistance. This project employs the vapor induced phase separation (VIPS) technique to develop a hydrophilic polyvinylidene fluoride (PVDF) membrane with polyethylene glycol (PEG) as an additive for produced water treatment. Results show that thanks to its slow nonsolvent intake, the VIPS method hinders additive leaching during the cast film immersion. The results also reveal that the exposure of the film to the open air before immersion greatly influences the structure of the developed membranes. By extending the exposure time from 0 to 30 min, the membrane morphology change from typical asymmetric with large macrovoids to the macrovoid-free porous symmetric membrane with a granular structure, which corresponds to 35% increment of steady-state permeability to 189 L·m−2h−1bar−1, while maintaining >90% of oil rejection. It was also found that more PEG content resides in the membrane matrix when the exposure time is extended, contributes to the elevation of surface hydrophilicity, which improves the membrane antifouling properties. Overall results demonstrate the potential of VIPS method for the fabrication of hydrophilic PVDF membrane by helping to preserve hydrophilic additive in the membrane matrices.

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“…An excellent membrane will provide high solute rejection with high permeability but with low fouling tendency. 10 Cross-flow filtration process was tested using the as-prepared membranes to filter HA from the feed solution and the results on the membrane filtration performance are shown in Table 2. S0 shows high HA rejection of 94.75% but significantly low permeability.…”

Section: Filtration Performancementioning

confidence: 99%

Fabrication of Microcrystalline Cellulose Incorporated Polyethersulfone Hybrid Mixed Matrix Membrane for Humic Acid Removal

Nazri¹,

Ahmad²,

Hussin³

2019

JPS

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Fouling and Cleaning in Osmotically Driven Membranes

Cited by 7 publications

References 66 publications

Polyvinylidene Fluoride Membrane Via Vapour Induced Phase Separation for Oil/Water Emulsion Filtration

Polyvinylidene Fluoride Membrane Via Vapour Induced Phase Separation for Oil/Water Emulsion Filtration

Development of Hydrophilic PVDF Membrane Using Vapour Induced Phase Separation Method for Produced Water Treatment

Fabrication of Microcrystalline Cellulose Incorporated Polyethersulfone Hybrid Mixed Matrix Membrane for Humic Acid Removal

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