Cleaning strategies and membrane flux recovery on anti-fouling membranes for pressure retarded osmosis

Xue, Li; Cai, Tao; Amy, Gary L.; Chung, Tai‐Shung

doi:10.1016/j.memsci.2016.09.016

Cited by 49 publications

(13 citation statements)

References 45 publications

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“…An acceptable RO membrane has to be resistant against chemicals and microbes [63]. It has to be mechanically and structurally stable over a long time [64]. It has to possess a great selectivity for certain solutes.…”

Section: Ro Membrane Materialsmentioning

confidence: 99%

Short Communication: Requiring Reverse Osmosis Membranes Modifications – An Overview

Ghernaout¹

2017

AJCHE

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Do really reverse osmosis (RO) membranes need modification to cover their disadvantages or enhance their efficiency? Are there any defects in RO membranes manufacturing that require modification? These questions are discussed here in this short review. Through the world, there are thousands of patents, publications, and PhD theses dealing with surface modification and grafting of RO membranes. This growing phenomenon should attract the attention of the scientific community for technologic and economic reasons. Due to the increasing water pollution levels, which overpassed the RO membranes capacities, there is an urgent need to manufacture RO membranes, with multidisciplinary characteristics and high performance regarding both salts removal and fouling resistance, before sending them to the market and avoiding to think to their following modification.

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Section: Ro Membrane Materialsmentioning

confidence: 99%

Short Communication: Requiring Reverse Osmosis Membranes Modifications – An Overview

Ghernaout¹

2017

AJCHE

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“…Membrane fouling decreases the pressure of water vapor, blocks the pores on the feed side, and narrows the evaporation areas. Membrane wettability (MW) is mainly caused by membrane fouling, which further reduces the quality of the concentrating fluid and affects the intercepting rate and membrane flux . Because membrane fouling can also easily be triggered and plays a key role in VMD, it is difficult to design an appropriate VMD process to concentrate HAS.…”

Section: Introductionmentioning

confidence: 99%

Threshold Flux for Vacuum Membrane Distillation to Concentrate Herbal Aqueous Solutions

et al. 2018

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Vacuum membrane distillation (VMD) is considered an effective method for concentration of herbal aqueous solutions (HAS). However, membrane fouling and flux decline are complex problems in such concentration processes. The concept of threshold flux was proposed for optimizing the membrane process. Whether it is useful for guiding optimization of the VMD process on HAS concentration needs further investigation. The Semen Raphani aqueous solution (SRAS) was taken as an example to investigate the membrane flux behavior during SRAS concentration by VMD. The results confirmed that the threshold flux concept is applicable to concentrate HAS by VDM. At or below the threshold flux, the total resistance was independent of the flux, while above it membrane fouling increased with higher membrane flux. Moreover, limiting the flux should be avoided in the membrane process because of strong fouling and flux decline.

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“…A variety of membranes including reverse osmosis (RO), nanofiltration (NF), and ultrafiltration (UF) membranes have been modified with pDA coating through hydrogen bonding, π-π stacking, the action of van der Waals forces and chelation [28]. This allows the grafting of different polymeric functional groups with their antifouling moieties such as zwitterionic polymers, hyper-branched polyglycerol and nanomaterials [29][30][31][32][33][34]. Kasemset et al.…”

mentioning

confidence: 99%

Reduced Fouling Ultrafiltration Membranes via In-Situ Polymerisation Using Polydopamine Functionalised Titanium Oxide

Al-Shaeli¹,

Hegab²,

Fang³

et al. 2020

Preprint

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The trade-off phenomenon between selectivity and permeation flux is a major challenge in pressure-driven membranes, and specifically for ultrafiltration membranes. Currently, many research studies have been performed to try to increase permeability while maintaining the rejection at a high level. However, in most of these studies, the improvement of permeability was accompanied by a decrease in rejection or vice versa. To tackle this problem, TiO2 nanoparticles were attached on the surface of PES membranes using polydopamine as adhesive agent. In general, it is quite challenging to attach/bind TiO2 on the surface of membranes due to agglomeration of nanoparticles. Therefore, we developed a practical, simple and a scalable method to attach TiO2 nanoparticles (NPs) on the top surface of membrane using one-step dip coating. Experimental results revealed that the modified layer enhanced the hydrophilicity of the PES UF membranes as confirmed by the decrease of contact angle from. As a result, the modified membranes exhibited a significant improvement in anti-fouling properties, with 12 times higher water permeation flux (962 LMH for pDA-f-TiO2-PES30) as compared to the pristine PES membranes (79.9 LMH). The static adsorption of BSA on the surface of membranes was reduced from (60 µg/cm2 for pristine PES to 21 µg/cm2 for pDA-f-TiO2- PES120). Furthermore, the modified PES membranes displayed a higher flux recovery ratio (97%) and fouling reversibility (98.62%) than pristine PES membrane (37.63%). Also, the coated PES membranes bestowed a good antibacterial property relative to the pristine one. Besides, the membranes showed better physical and chemical stability as compared with unmodified PES membranes. Thus, this study provided a facile approach for enhancing the anti-fouling performance of PES ultrafiltration membranes.

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Cleaning strategies and membrane flux recovery on anti-fouling membranes for pressure retarded osmosis

Cited by 49 publications

References 45 publications

Short Communication: Requiring Reverse Osmosis Membranes Modifications – An Overview

Short Communication: Requiring Reverse Osmosis Membranes Modifications – An Overview

Threshold Flux for Vacuum Membrane Distillation to Concentrate Herbal Aqueous Solutions

Reduced Fouling Ultrafiltration Membranes via In-Situ Polymerisation Using Polydopamine Functionalised Titanium Oxide

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