Rejection modeling of ceramic membranes in organic solvent nanofiltration

Blumenschein, Stefanie; Böcking, Axel; Kätzel, Uwe; Postel, Stefanie; Weßling, Matthias

doi:10.1016/j.memsci.2016.02.042

Cited by 26 publications

(21 citation statements)

References 36 publications

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“…This model has been used widely into recent times to model and explain nanofiltration performance using a variety of feed solutions with success [14] [15] [16] [17] [18] [19]. DSPM-DE is a comprehensive model for nanofiltration.…”

Section: The Dspm-de Model Of Nanofiltrationmentioning

confidence: 99%

“…Furthermore, the image charges are screened by electric double layers in electrolyte solutions [21]. The DSPM-DE model in the form introduced by Bowen and Welfoot [21] has been used successfully by several authors, including in recent years for a variety of feed compositions [16] [18] [19]. In reference [21], Bowen and Welfoot successfully implemented the DSPM-DE model for the same membrane considered in the current work (Desal5DK) accounting for only the Born mechanism of dielectric exclusion for sodium-chloride and magnesium-chloride.…”

Section: Historical Development Of the Dspm-de Modelmentioning

confidence: 99%

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Effect of temperature on ion transport in nanofiltration membranes: Diffusion, convection and electromigration

2017

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Nanofiltration performance as a function of feed temperature is relevant to several industrial settings including pretreatment for scale control in thermal desalination. Understanding of solute transport as a function of temperature is critical for effective membrane and system design. In this study, nanofiltration is modeled at 22, 40 and 50 o C using the Donnan Steric Pore Model with dielectric exclusion (DSPM-DE).This modeling includes the temperature dependence of the three modes of solute transport, namely the convective, electromigrative, and diffusive modes, and the three mechanisms of solute exclusion, namely Donnan, steric, and dielectric exclusion. The effect of temperature is captured through the variation of membrane parameters and solvent and ionic mobilities with temperature. We compare the most abundant ionic compound in natural water, sodium-chloride with magnesium-chloride to portray how the salt passage and rejection change for a 1:1 salt compared to a 2:1 salt, and we analyze Arabian Gulf seawater to understand how rejection of scale-forming ions, such as Mg 2+ and Ca 2+ , is affected by feed temperature.In all cases, solute transport increases with temperature, attributed predominantly to the cumulative effect of membrane parameters and only to a small extent (up to 5%) to the solvent viscosity and ion diffusivity together.Keywords: Nanofiltration, Temperature, Ion transport, Desalination

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Section: The Dspm-de Model Of Nanofiltrationmentioning

confidence: 99%

Section: Historical Development Of the Dspm-de Modelmentioning

confidence: 99%

Effect of temperature on ion transport in nanofiltration membranes: Diffusion, convection and electromigration

2017

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“…Tam & Tremblay (1991) described that with a five component mixture of PEGs, the MWCO of membranes can accurately be determined [37]. This method is widely used for the determination of the pore size distribution of membranes [26][27][28].…”

Section: Mwco Calculationmentioning

confidence: 99%

“…For analysing the quality of ceramic UF or NF membranes, size exclusion and permporometry methods are most commonly used [26][27][28]. The disadvantage to permporometry is the requirement of specific equipment [28][29][30]. When using size exclusion methods, the molecular weight cut-off (MWCO) is determined using a multiple monodisperse molecules of different sizes, e.g.…”

Section: Introductionmentioning

confidence: 99%

Quantifying defects in ceramic tight ultra- and nanofiltration membranes and investigating their robustness

Kramer

Shang

Scherrenberg

et al. 2019

Separation and Purification Technology

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Quantifying defects in ceramic tight ultra-and nanofiltration membranes and investigating their robustness Kramer, F. C.; Shang, R.; Scherrenberg, S. M.; Rietveld, L. C.; Heijman, S. J.G. A B S T R A C TOne of the perceived benefits of ceramic membranes is their robustness, which makes them suitable for treating high organic load waste streams. In particular, ceramic tight ultrafiltration (tUF) and nanofiltration (NF) form an important barrier against small colloids and organic molecules. In order to achieve this barrier, the quality of the membranes should be uncompromised.An extension on a commonly used size exclusion method was developed in order to quantify defects in membranes and calculate the MWCO accurately excluding the defects. This approach gives a better representation of the membrane quality than the original method. The quality of a broad range of commercial ceramic membranes was investigated by determining the (i) hydraulic permeability, (ii) molecular weight cutoff, and (iii) quantitative defects. Several membranesboth tubular and disc membranes, selected from various supplierswere tested to investigate their variability. Furthermore, the robustness of tubular NF membranes was studied by monitoring the effect of long-term exposure to sodium hypochlorite, which is commonly used to mitigate organic fouling.The results showed that batches of both tubular and disc membranes of different pore size and suppliers included membranes with defects. Furthermore, the long-term treatment of tubular ceramic membranes with sodium hypochlorite negatively affected, beyond expectation, the quality of the membranes. The separation layer in these membranes was not notably compromised by sodium hypochlorite exposure, but the end seal layer was damaged.

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“…In general, transport characteristics are much less investigated compared to polymeric membranes. Additionally, due to the multifaceted nature of interactions between membrane, solvent, and solute, the prediction of transport mechanism in OSN is much more complicated compared to aqueous applications [23]. Nevertheless, mathematical description of NF separations, whether it is organic or an aqueous solution containing organic compounds, is of great interest for many researchers [24][25][26][27][28][29][30][31][32][33][34] and it is far from truly being predictive.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Total Volume Membrane Charge Density through Mathematical Modeling for Separation of Succinic Acid Aqueous Solutions on Ceramic Nanofiltration Membrane

et al. 2019

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Nanofiltration of aqueous solutions of succinic acid with the addition of sodium hydroxide or magnesium hydroxycarbonate has been investigated experimentally and modeled with the comprehensively described Donnan-Steric partitioning model. The experimental retentions of acid at the same pH varied between 16% and 78%, while the estimated total volume membrane charge densities were in the range of −35.73 and +875.69 mol/m 3 . This work presents a novel insight into the modeling of nanofiltration and investigates the relations between the estimated total volume membrane charge densities, ionic strength, and component concentration on the performance of ceramic membrane. In addition, this study takes into consideration other parameters such as pH regulation and viscosities of solutions.

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Rejection modeling of ceramic membranes in organic solvent nanofiltration

Cited by 26 publications

References 36 publications

Effect of temperature on ion transport in nanofiltration membranes: Diffusion, convection and electromigration

Effect of temperature on ion transport in nanofiltration membranes: Diffusion, convection and electromigration

Quantifying defects in ceramic tight ultra- and nanofiltration membranes and investigating their robustness

Assessment of the Total Volume Membrane Charge Density through Mathematical Modeling for Separation of Succinic Acid Aqueous Solutions on Ceramic Nanofiltration Membrane

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