Relating transport modeling to nanofiltration membrane fabrication: Navigating the permeability-selectivity trade-off in desalination pretreatment

Labban, Omar; Liu, Chang; Chong, Tzyy Haur; Lienhard, John H.

doi:10.1016/j.memsci.2018.02.053

Cited by 59 publications

(38 citation statements)

References 55 publications

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“…Nanofiltration (NF) can selectively remove divalent ions and has been considered previously in the literature as a pre-treatment method for conventional seawater RO to reduce divalent scale formation on the membranes [82,83]. For the benefit of readers, we evaluated the approximate costs of NF pre-treatment.…”

Section: Appendix C Discussion On Nanofiltrationmentioning

confidence: 99%

Cost and energy needs of RO-ED-crystallizer systems for zero brine discharge seawater desalination

et al. 2019

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A zero brine discharge seawater desalination concept integrating reverse osmosis (RO), electrodialysis (ED) and crystallizer into a single system (REC) is presented. Analytical models were used to optimize parameters and minimize water production costs. Parameters varied were: the ratio of seawater to RO brine in the ED diluate channel, ED current density, ED diluate outlet salinity, electricity and salt prices, and RO recovery by adding high pressure RO (HPRO). Using only RO brine instead of only seawater in the ED diluate channel reduced water production costs by 87% from 27 to 3.5 $/m 3 while increasing salt production costs 26% from 135 to 170 $/tonne-salt. The former was best for brine minimization, and the latter for salt production.Optimizing ED current density reduced REC costs by another 14% to 3.0 $/m 3 while increasing specific energy consumption 26% to 12.7 kWh e /m 3 , corresponding to a Second Law efficiency of 18%. Adding an HPRO stage was uneconomical as it increased specific costs 21%. A salt price of 104.5 $/tonne-salt will justify the cost of adding an ED-crystallizer. REC systems may be economically feasible in parts of the Middle-East. Producing other products such as Mg(OH) 2 or Br 2 may further improve economics. , "Cost and energy needs of RO-ED crystallizer systems for zero brine discharge seawater desalination," Desalination, online

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Section: Appendix C Discussion On Nanofiltrationmentioning

confidence: 99%

Cost and energy needs of RO-ED-crystallizer systems for zero brine discharge seawater desalination

et al. 2019

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“…In bulk phase, the correlation time of dipole moments of water in Fig. 7 was taken into account in eqn (13) and (15) and we obtained s ¼ 3.9 ps and s rel ¼ 3.1 ps. The rather small difference between s and s rel indicates that the behavior of bulk water is close to that of a Debye dielectric.…”

Section: Resultsmentioning

confidence: 88%

“…[3][4][5][6] Among which, nanoltration (NF) membranes have been widely used in drinking water preparation, wastewater treatment, product desalination and purication and other elds due to its excellent separation performance. [7][8][9][10][11][12][13] However, due to the special effect brought by the complex structure of nanoltration membrane, research on the separation mechanism and theoretical model of nanoltration has become one of the difficulties in the eld of nanoltration research, which limits the development and application of nanoltration membranes. In recent years the special effect caused by the nanoscale size of nanoltration membrane has been paid more and more attention.…”

Section: Introductionmentioning

confidence: 99%

Investigation of dielectric constants of water in a nano-confined pore

et al. 2020

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“…On the one hand, process design of water treatment plants uses numerical optimization methods to find the right connectivity of membranes, pumps, and mixers [2][3][4][5][6][7][8][9][10][11]. On the other hand, recent developments in membrane science deliver better performance, balancing the delicate trade-off between permeability and selectivity in membrane design [1,12] by changing the material systems, using composite membranes or modifying the membrane surface [13][14][15][16][17][18]. However, the simultaneous design of membranes and processes may offer opportunities for synergies, as the development of the membrane and the process takes place concurrently.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous rational design of ion separation membranes and processes

Rall

Schweidtmann

Aumeier

et al. 2020

Journal of Membrane Science

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Economically viable water treatment process plants for drinking water purification are a prerequisite for sustainable supply of safe drinking water in the future. However, modern membrane process development experiences a disconnect in this domain: the synthesis of the membrane and the design of the process are decoupled. We propose an optimization strategy to simultaneously design the performance of layer-by-layer nanofiltration membrane modules and the separation process. This approach achieves overall optimal performance by extending the search space and thus exploiting synergies. Better separation performances at a lower cost as compared to conventional optimization strategies can be achieved. The key feature of this optimization framework is the integration of artificial neural networks. This machine-learning technique describes membrane performance as a function of its synthesis protocol. We optimize the design problem rigorously by a deterministic global nonlinear optimization method. Thus, this framework yields membrane synthesis protocols and membrane processes that are optimally tailored to the desired separation task. In a showcase, the simultaneous membrane synthesis and process optimization design achieve immediately favorable results with lower impurities at comparable costs. The process investment and operation costs are compared to a state of the art commercially available membrane for nanofiltration.

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Relating transport modeling to nanofiltration membrane fabrication: Navigating the permeability-selectivity trade-off in desalination pretreatment

Abstract: J i = J v • c ip

Cited by 59 publications

References 55 publications

Cost and energy needs of RO-ED-crystallizer systems for zero brine discharge seawater desalination

Cost and energy needs of RO-ED-crystallizer systems for zero brine discharge seawater desalination

Investigation of dielectric constants of water in a nano-confined pore

Simultaneous rational design of ion separation membranes and processes

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