Factors contributing to the change in permeate quality upon temperature variation in nanofiltration

Roy, Yagnaseni; Lienhard, John H.

doi:10.1016/j.desal.2018.12.017

Cited by 13 publications

(8 citation statements)

References 29 publications

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“…The Donnan-steric pore model (DSPM) was used to develop a framework to characterize transport across the fabricated Cu–MPD nanofiltration membranes. − The extended Nernst–Planck equation was applied to model transmembrane transport. For uncharged solutes, the migration term is neglected and transport is governed by convection and diffusion .…”

Section: Methodsmentioning

confidence: 99%

Novel Positively Charged Metal-Coordinated Nanofiltration Membrane for Lithium Recovery

Wang

Rehman

Sun

et al. 2021

ACS Appl. Mater. Interfaces

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Nanofiltration (NF) with high water flux and precise separation performance with high Li + /Mg 2+ selectivity is ideal for lithium brine recovery. However, conventional polyamidebased commercial NF membranes are ineffective in lithium recovery processes due to their undesired Li + /Mg 2+ selectivity. In addition, they are constrained by the water permeance selectivity trade-off, which means that a highly permeable membrane often has lower selectivity. In this study, we developed a novel nonpolyamide NF membrane based on metal-coordinated structure, which exhibits simultaneously improved water permeance and Li + /Mg 2+ selectivity. Specifically, the optimized Cu−mphenylenediamine (MPD) membrane demonstrated a high water permeance of 16.2 ± 2.7 LMH/bar and a high Li + /Mg 2+ selectivity of 8.0 ± 1.0, which surpassed the trade-off of permeance selectivity. Meanwhile, the existence of copper in the Cu−MPD membrane further enhanced anti-biofouling property and the metalcoordinated nanofiltration membrane possesses a pH-responsive property. Finally, a transport model based on the Nernst−Planck equations has been developed to fit the water flux and rejection of uncharged solutes to the experiments conducted. The model had a deviation below 2% for all experiments performed and suggested an average pore radius of 1.25 nm with a porosity of 21% for the Cu−MPD membrane. Overall, our study provides an exciting approach for fabricating a nonpolyamide high-performance nanofiltration membrane in the context of lithium recovery.

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Section: Methodsmentioning

confidence: 99%

Novel Positively Charged Metal-Coordinated Nanofiltration Membrane for Lithium Recovery

Wang

Rehman

Sun

et al. 2021

ACS Appl. Mater. Interfaces

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“…It is worth noting that the initial TMP of the membrane of the SF+O 3 -BAC+NF process was higher than that of SF+NF, which was due to the water temperature (the average water temperature during the operation of the SF+NF process was 29.6 degrees, while the average water temperature of the SF+O 3 -BAC+NF process was 8.9 degrees). The drop in water temperature reduced the water production performance of the nanofiltration membrane [ 25 , 26 ], thus the inlet water pressure required for the nanofiltration membrane to maintain flux under low temperature conditions was also relatively large. These results indicate that the mitigation effect of SF+O 3 -BAC pre-treatment on NF membrane fouling was far better than that of single SF pre-treatment.…”

Section: Resultsmentioning

confidence: 99%

Pilot Study on the Combination of Different Pre-Treatments with Nanofiltration for Efficiently Restraining Membrane Fouling While Providing High-Quality Drinking Water

Chen

Pang

et al. 2021

Membranes

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Nanofiltration (NF) is a promising post-treatment technology for providing high-quality drinking water. However, membrane fouling remains a challenge to long-term NF in providing high-quality drinking water. Herein, we found that coupling pre-treatments (sand filtration (SF) and ozone–biological activated carbon (O3-BAC)) and NF is a potent tactic against membrane fouling while achieving high-quality drinking water. The pilot results showed that using SF+O3-BAC pre-treated water as the feed water resulted in a lower but a slowly rising transmembrane pressure (TMP) in NF post-treatment, whereas an opposite observation was found when using SF pre-treated water as the feed water. High-performance size-exclusion chromatography (HPSEC) and three-dimensional excitation–emission matrix (3D-EEM) fluorescence spectroscopy determined that the O3-BAC process changed the characteristic of dissolved organic matter (DOM), probably by removing the DOM of lower apparent molecular weight (LMW) and decreasing the biodegradability of water. Moreover, amino acids and tyrosine-like substances which were significantly related to medium and small molecule organics were found as the key foulants to membrane fouling. In addition, the accumulation of powdered activated carbon in O3-BAC pre-treated water on the membrane surface could be the key reason protecting the NF membrane from fouling.

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“…The key steric hindrance parameter is relative solute size (q) shown as a quotient of the Stokes cation radius and the effective membrane pore radius in Equation (12).…”

Section: Steric Hindrance Factorsmentioning

confidence: 99%

“…Temperature also has a large effect on the transport through the membrane. As presented by Roy and Lienhard, the membrane structural changes and changes in membrane charge with increase in temperature cause increase and decrease of the permeate concentration, respectively [12].…”

Section: Introductionmentioning

confidence: 95%

Intrinsic Dependence of Groundwater Cation Hydraulic and Concentration Features on Negatively Charged Thin Composite Nanofiltration Membrane Rejection and Permeation Behavior

Kukučka

Stojanović

2022

Membranes

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Commercial nanofiltration membranes of different molecular weight cut-offs were tested on a pilot plant for the exploration of permeation nature of Ca, Mg, Mn, Fe, Na and ammonium ions. Correlation of transmembrane pressure and rejection quotient versus volumetric flux efficiency on nanofiltration membrane rejection and permeability behavior toward hydrated divalent and monovalent ions separation from the natural groundwater was observed. Membrane ion rejection affinity (MIRA) dimension was established as normalized TMP with regard to permeate solute moiety representing pressure value necessary for solute rejection change of 1%. Ion rejection coefficient (IRC) was introduced to evaluate the membrane rejection capability, and to indicate the prevailed nanofiltration partitioning mechanism near the membrane surface. Positive values of the IRC indicated satisfactory rejection efficiency of the membrane process and its negative values ensigned very low rejection affinity and high permeability of the membranes for the individual solutes. The TMP quotient and the efficiency of rejection for individual cations showed upward and downward trends along with flux utilization increase. Nanofiltration process was observed as an equilibrium. The higher the Gibbs free energy was, cation rejection was more exothermic and valuably enlarged. Low Gibbs free energy values circumferentially closer to endothermic zone indicated expressed ions permeation.

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Factors contributing to the change in permeate quality upon temperature variation in nanofiltration

Cited by 13 publications

References 29 publications

Novel Positively Charged Metal-Coordinated Nanofiltration Membrane for Lithium Recovery

Novel Positively Charged Metal-Coordinated Nanofiltration Membrane for Lithium Recovery

Pilot Study on the Combination of Different Pre-Treatments with Nanofiltration for Efficiently Restraining Membrane Fouling While Providing High-Quality Drinking Water

Intrinsic Dependence of Groundwater Cation Hydraulic and Concentration Features on Negatively Charged Thin Composite Nanofiltration Membrane Rejection and Permeation Behavior

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