An Integrated approach for characterization of polyamide reverse osmosis membrane degradation due to exposure to free chlorine

Surawanvijit, Sirikarn; Rahardianto, Anditya; Cohen, Yoram

doi:10.1016/j.memsci.2016.02.044

Cited by 64 publications

(30 citation statements)

References 38 publications

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“…For example, activated carbon can effectively remove free chlorine, a common chemical existing in tap water after water chlorination (Jamaly et al, 2014). As discussed before, exposure to free chlorine could cause RO membrane degradation and consequently shorten the membrane lifetime (Surawanvijit et al, 2016). A lot of work has been down on developing novel RO membranes with chlorine-tolerant property Kwon et al, 2012;Liu et al, 2014Liu et al, , 2015Rana et al, 2015;Saqib and Aljundi, 2016).…”

Section: Pretreatment Technologiesmentioning

confidence: 99%

A review of reverse osmosis membrane fouling and control strategies

Jiang

Li²

2017

Science of The Total Environment

750

362

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Reverse osmosis (RO) membrane technology is one of the most important technologies for water treatment. However, membrane fouling is an inevitable issue. Membrane fouling leads to higher operating pressure, flux decline, frequent chemical cleaning and shorter membrane life. This paper reviews membrane fouling types and fouling control strategies, with a focus on the latest developments. The fundamentals of fouling are discussed in detail, including biofouling, organic fouling, inorganic fouling and colloidal fouling. Furthermore, fouling mitigation technologies are also discussed comprehensively. Pretreatment is widely used in practice to reduce the burden for the following RO operation while real time monitoring of RO has the advantage and potential of providing support for effective and efficient cleaning. Surface modification could slow down membrane fouling by changing surface properties such as surface smoothness and hydrophilicity, while novel membrane materials and synthesis processes build a promising future for the next generation of RO membranes with big advancements in fouling resistance. Especially in this review paper, statistical analysis is conducted where appropriate to reveal the research interests in RO fouling and control.Graphic Abstract

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Section: Pretreatment Technologiesmentioning

confidence: 99%

A review of reverse osmosis membrane fouling and control strategies

Jiang

Li²

2017

Science of The Total Environment

750

362

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“…here ς is the reflection coefficient, and 〈c aq s,m 〉 is the average concentration within the membrane matrix. A widely accepted simplification assumes a linear concentration profile inside the membrane, giving 〈c aq s,m 〉 = (c aq s,F +c aq s,P ) /2 (Kargol, 2000;Surawanvijit et al, 2016). Rearranging Eq.…”

Section: Appendix B Analysis Of Convective Transport Relative To Solution-diffusion Transportmentioning

confidence: 99%

Influence of Solute Molecular Diameter on Permeability-Selectivity Tradeoff of Thin-Film Composite Polyamide Membranes in Aqueous Separations

2021

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Fundamental understanding of the reverse osmosis (RO) transport phenomena is necessary for quantitative prediction of contaminant rejection and development of more selective membranes. The solution-diffusion (S-D) model predicts a tradeoff relationship between permeability and selectivity, and this tradeoff trend was recently reported for RO. But the first principles governing the relationship are not well understood for aqueous separation membranes. This study presents a framework to elucidate the underlying factors of the permeabilityselectivity tradeoff relationship in thin-film composite polyamide (TFC-PA) membranes. Water and solute permeabilities of membranes with a range of selectivities are examined using six nonelectrolyte solutes of various sizes and dimensions. The permeability-selectivity tradeoff trend, as defined by S-D, was observed for all six solutes. Crucially, the slopes of the tradeoff lines, λ, are found to be related to the solute and solvent (i.e., water) diameters, d s and d w , respectively, by λ = (d s /d w ) 2 -1, consistent with the S-D framework established for gas separation membranes. Additionally, the intercepts of the tradeoff lines are shown to be also influenced by d s . These results highlight that solute molecular diameter is a primary influence on the permeability-selectivity tradeoff for the permeants investigated in this study. Furthermore, a transport regime where solute permeation is only very weakly coupled to water transport, in addition to the conventional S-D, is identified for the first time. We demonstrate that the boundary delineating the two transport regimes can be determined by the solute diameter. The relationship between characteristic features of the "additional regime" and solute dimensions are analyzed. The study shows that the general principles of the S-D framework are applicable to TFC-PA membranes and the analysis quantified the principal role of solute size in governing RO transport. The experimental and analytical evidence suggest that nonelectrolyte solute transport can, in principle, be a priori predicted using molecular diameter. Findings of this investigation provide new insights for understanding the transport mechanisms in osmotic membrane processes.

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“…The reaction shown in Figure (a) would destroy the hydrogen bonding among interchains liking and weaken intermolecular interactions of PA resulting in the decrease of salt rejection of M phos. This destructiveness to salt rejection trended distinctly with the increase in amide bonds amount on membrane surface. In addition, when the phosphonic acid grafting degree enhanced, the improvement of hydrophilicity also led to an undesirable swelling, which resulted in the decline of salt rejection.…”

Section: Resultsmentioning

confidence: 98%

Surface modification of polyamide reverses osmosis membrane by phosphonic acid group with improved performance

Zhao

Dai

Zhang

et al. 2018

J of Applied Polymer Sci

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A facial method for preparing reverse osmosis polyamide (PA) membranes of excellent antifouling and separation performance was developed via covalently grafting phosphonic acid on membrane surface. First, a pristine PA layer was synthesized by interfacial polymerization between m-phenylenediamine and trimesoyl chloride. Then, a second interfacial reaction was implemented between ethylenediamine and the residual acryl chloride on the pristine PA layer, generating an active layer enriched by primary amine. Finally, the amine-rich surface treated by formaldehyde and phosphorous acid to produce a membrane surface modified by phosphonic acid groups. Surface characterization by attenuated total reflectance infrared, X-ray photoelectron spectroscopy and zeta-potential measurements illustrated the presence of phosphonic acid group. The lowest contact angle of modified membrane was 26 , demonstrating the membrane possessed an outstandingly wettable surface. The optimal separation performance was 88 L m −2 h −1 of water flux and 99.4% of salt rejection under 1.55 MPa. In addition, bovine serum albumin was used as organic foulant to measure the antifouling property of membranes. The result of dynamic fouling experiments indicated that the modified membrane exhibited better antifouling (of which the irreversible fouling degree was 7.1%) compared with commercial membrane BW30 (of which the irreversible fouling degree was 13.5%).

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An Integrated approach for characterization of polyamide reverse osmosis membrane degradation due to exposure to free chlorine

Cited by 64 publications

References 38 publications

A review of reverse osmosis membrane fouling and control strategies

A review of reverse osmosis membrane fouling and control strategies

Influence of Solute Molecular Diameter on Permeability-Selectivity Tradeoff of Thin-Film Composite Polyamide Membranes in Aqueous Separations

Surface modification of polyamide reverses osmosis membrane by phosphonic acid group with improved performance

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