Comparison of integrally asymmetric and thin film composite structures for a desirable fashion of forward osmosis membranes

Nguyen, Thi Phuong Nga; Jun, Byung-Moon; Lee, Jong Hwa; Kwon, Young‐Nam

doi:10.1016/j.memsci.2015.05.039

Cited by 53 publications

(25 citation statements)

References 39 publications

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“…The majority of these studies were conducted with commercial CTA membranes because no high performing TFC-FO membranes were commercially available until recently. In recent years, HTI has commenced commercial production of a TFC membrane with a tailor-made support structure to suit FO applications [13][14][15]. This HTI-TFC membrane is thought to have superior performance and anti-fouling properties [16,17] in addition to a broad pH tolerance range compared to the HTI-CTA membrane.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Organic fouling behaviour of structurally and chemically different forward osmosis membranes – A study of cellulose triacetate and thin film composite membranes

Mazlan

Marchetti

Maples

et al. 2016

Journal of Membrane Science

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Section: Introductionmentioning

confidence: 99%

“…As it is relatively new, the HTI-TFC membrane has not been widely studied in detail. Alongside production of the commercial HTI-TFC membrane, there has been a rise in the design and fabrication of TFC membranes with tailor-made properties suited for use in FO applications [14,[18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Organic fouling behaviour of structurally and chemically different forward osmosis membranes – A study of cellulose triacetate and thin film composite membranes

Mazlan

Marchetti

Maples

et al. 2016

Journal of Membrane Science

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“…Clearly, for the PA-TFC membrane fouling control with alginate + gypsum is more difficult than that of alginate with colloidal silica. As discussed in section 3.1, for single gypsum fouling, the presence of a rich carboxylic group (-COO-) in PA-TFC [37] could interact with the Ca 2+ ions to generate a homogeneous crystallization [52]; this being an example of adverse membrane-foulant interaction.…”

Section: Critical Flux Determination Using Combined Foulantmentioning

confidence: 99%

“…their, cellulose triacetate (CTA) and thin film composite (TFC)). However, a newly developed polyamide thin-film composite (PA-TFC) from the Toray company was recently introduced as a potential candidate for the practical application due to its high permeability [37] [38] [39]. Therefore, a comparison of critical flux behavior between the former and latter membrane is essential to aid membrane selection.…”

Section: Introductionmentioning

confidence: 99%

Critical flux-based membrane fouling control of forward osmosis: Behavior, sustainability, and reversibility

Nguyen

Kook

Lee

et al. 2019

Journal of Membrane Science

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Membrane fouling is closely related to the concept of critical flux. Therefore, a fouling control stategy for forward osmosis (FO) membranes that is based on the critical flux is necessary. This study systematically investigated the critical flux behavior of FO membranes (CTA and PA-TFC) in the short-term using a stepping method (draw solution (DS) concentration stepping). In addition, to test the reliability of this method, long-term experiments were conducted to evaluate the influences of operational critical flux on the fouling behavior (sustainable operation and fouling reversibility/irreversibility), thereby determining the critical flux for reversibility. Our results showed that the DS concentration stepping could be applied for critical flux determination in FO. Both membranes exhibited higher critical flux values for alginate fouling compared to other single foulants such as colloidal silica or gypsum. The values were 15.9 LMH for a cellulose triacetate membrane (CTA) and 20.5 LMH for the polyamide thin-film composite (PA-TFC). Whilst these values should be adequate in FO applications they were determined for single foulants. The presence of multispecies of foulants caused a significant decline in the critical flux values. This study found 5.4 LMH for the CTA membrane and 8.3 LMH for the PA-TFC membrane for the combined foulants of alginate + gypsum. This indicates that the critical flux behavior in FO was dependent on the foulant type and membrane type. Importantly, 98-100% restoration of water flux was achieved with the PA-TFC membrane at an operation either close to or below critical flux (i.e., in case of negligible fouling), except for the combination of alginate-combined colloidal silica. The critical fluxes for reversibility obtained in this study will aid the efficient operation of practical FO processes.

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“…Generally, NF membranes comprise two different layers-a support layer and an active layer-to optimize water flux and salt rejection [17]. The active layers of NF membranes have been fabricated through interfacial polymerization using reactions between an amine-based monomer in an aqueous phase and an acyl chloride-based monomer in an organic solvent phase [18].…”

Section: Introductionmentioning

confidence: 99%

Post-Treatment of Nanofiltration Polyamide Membrane through Alkali-Catalyzed Hydrolysis to Treat Dyes in Model Wastewater

Jun

Yoon

Park

2019

Water

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This research focused on the influence of post-treatment using alkali-catalyzed hydrolysis with a full-aromatic nanofiltration (NF) polyamide membrane and its application to the efficient removal of selected dyes. The post-treated membranes were characterized through Fourier transform infrared spectroscopy, goniometry, and zeta-potential analysis to analyze the treatment-induced changes in the intrinsic properties of the membrane. Furthermore, the changes in permeability induced by the post-treatment were evaluated via the measurement of water flux, NaCl rejection, and molecular weight cutoff (MWCO) under different pH conditions and post-treatment times. Major changes induced by the post-treatment in terms of physicochemical properties were the enhancement of permeability, hydrophilicity, and negative charge due to the hydrolysis of the membrane’s amide bonds. Four different dyes were selected as representative organic pollutants considering the MWCO of the post-treated membranes. Compared with the pristine NF membrane, membranes post-treated at pH 13.5 showed better water flux with similar rejection of the target dyes. On the basis of these results, the proposed post-treatment method for NF membranes can be applied to the removal of organic pollutants of various size.

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Comparison of integrally asymmetric and thin film composite structures for a desirable fashion of forward osmosis membranes

Cited by 53 publications

References 39 publications

Organic fouling behaviour of structurally and chemically different forward osmosis membranes – A study of cellulose triacetate and thin film composite membranes

Organic fouling behaviour of structurally and chemically different forward osmosis membranes – A study of cellulose triacetate and thin film composite membranes

Critical flux-based membrane fouling control of forward osmosis: Behavior, sustainability, and reversibility

Post-Treatment of Nanofiltration Polyamide Membrane through Alkali-Catalyzed Hydrolysis to Treat Dyes in Model Wastewater

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