Influence of concentration polarization and thermodynamic non-ideality on salt transport in reverse osmosis membranes

Jang, Eui Soung; Mickols, William; Sujanani, Rahul; Helenic, Alysha; Dilenschneider, Theodore J.; Kamcev, Jovan; Paul, Donald R; Freeman, Benny D.

doi:10.1016/j.memsci.2018.11.006

Cited by 46 publications

(36 citation statements)

References 24 publications

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“…100 to 200 nm thick [30,33], together with the two Donnan layers on each side of this active layer. We neglect concentration polarization (CP) on the retentate side [34][35][36].…”

Section: Theorymentioning

confidence: 99%

Ion Selectivity in Brackish Water Desalination by Reverse Osmosis: Theory, Measurements, and Implications

Biesheuvel¹,

Zhang²,

Gasquet³

et al. 2019

Environ. Sci. Technol. Lett.

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Reverse Osmosis (RO) is a membrane-based technology for water desalination. Of paramount importance is the understanding of ion selectivity in mixtures of salts, i.e., to what extent the membrane retains one ion more than another in a multicomponent salt solution. We apply continuum transport theory to describe a large set of data for the ion selectivity of RO membranes treating brackish ground water with more than ten different mono-and divalent ions. The model is based on the Donnan steric partitioning pore model extended to include ions of multiple charge states, such as bicarbonate/carbonic acid, ammonia/ammonium, and the hydroxyl/hydronium ions, and the acid-base reactions between them and with the membrane charge. By adjusting for each ion the ratio of ion size over pore size, we can fit the model to the data. We note that the fitted ion sizes do not always follow a logical order based on the ionic or hydrated size of the ions and that rejection of divalent cations is overestimated in some cases. We discuss possible theoretical improvements to address these discrepancies. Our results highlight the potential of continuum transport theory to describe in detail multicomponent ion transport in RO membranes. The development of a detailed and validated physics-based model is an important step towards achieving improved operation and design of RO-based desalination systems.

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“…100 to 200 nm thick [30,33], together with the two Donnan layers on each side of this active layer. We neglect concentration polarization (CP) on the retentate side [34][35][36].…”

Section: Theorymentioning

confidence: 99%

Ion Selectivity in Brackish Water Desalination by Reverse Osmosis: Theory, Measurements, and Implications

Biesheuvel¹,

Zhang²,

Gasquet³

et al. 2019

Environ. Sci. Technol. Lett.

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show abstract

“…In the review [2] it was mentioned about using indirect methods in preceding works. On the other hand, the majority of concertation polarization researches have theoretical character and dedicated to problems of numeric simulation of this phenomenon and influence to the intensity of scaling formation [6]; development of models for inorganic salts transport through the membrane [7]; simulation of the concentration field during flow in channels with spacers [8], determination of limiting fluxes [9] and impact to fouling formation [10,11].…”

Section: Literature Reviewmentioning

confidence: 99%

The Estimation of Feed Solution Composition Influence on Concentration Polarization Layer Resistance during Reverse Osmosis

Huliienko¹

2019

JES

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The experimental determination of concentration polarization layer resistance during reverse osmosis of mineral salts solutions was carried out with the aim to estimate the influence of solution composition on the value of mentioned resistance. In experimental conditions, the membrane resistance remains constant (the mean value was 0.534•10 14 m-1) which means that the membrane compaction was not observed. Moreover, under experimental conditions, the hypothesis about linear dependence between the concentration polarization layer and applied pressure was confirmed for all solutions under investigations. It was defined that value of concentration polarization layer resistance different salt solutions was varied less than 10 % although under experimental conditions the diffusion coefficient values of magnesium sulfate were more than three times higher than corresponded values for other salts. The increasing of solutions concertation determines the increasing of concentration polarization layer resistance. At the same time, in previous study it was defined that changes in hydrodynamic regime in membrane module under similar conditions could determine the change in concentration polarization layer resistance in 3-5 times, while in both studies the trends of impact of hydrodynamic conditions still similar to the value of considered resistance decrease with Reynolds number increasing. Such results showed that in considered range of concentrations the hydrodynamic conditions have a lower influence on concentration polarization layer resistance than solution composition. The obtained results are in agreement with the film theory of concentration polarization.

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“…The minimum recovery rate of RO was 4% obtained using an NF recovery rate of 90%. This can be attributed to the excessive concentration polarization due to the high salinity of the used feed solution [ 45 ]. Figure 4 shows the relationship between the recovery rate from NF and the energy consumption of the RO process.…”

Section: Resultsmentioning

confidence: 99%

A Hybrid NF-FO-RO Process for the Supply of Irrigation Water from Treated Wastewater: Simulation Study

et al. 2021

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Municipal treated wastewater could be considered as a water source for food crop irrigation purposes. Enhancing the quality of treated wastewater to meet irrigation standards has become a necessary practice. Nanofiltration (NF) was used in the first stage to produce permeate at relatively low energy consumption. In the second stage, two membrane combinations were tested for additional water extraction from the brine generated by the NF process. The simulation results showed that using a hybrid forward osmosis (FO)–reverse osmosis (RO) system is more efficient than using the RO process alone for the further extraction of water from the brine generated by the NF process. The total specific energy consumption can be reduced by 27% after using FO as an intermediate process between NF and RO. In addition, the final permeate water quality produced using the hybrid FO-RO system was within the allowable standards for food crops irrigation.

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Influence of concentration polarization and thermodynamic non-ideality on salt transport in reverse osmosis membranes

Cited by 46 publications

References 24 publications

Ion Selectivity in Brackish Water Desalination by Reverse Osmosis: Theory, Measurements, and Implications

Ion Selectivity in Brackish Water Desalination by Reverse Osmosis: Theory, Measurements, and Implications

The Estimation of Feed Solution Composition Influence on Concentration Polarization Layer Resistance during Reverse Osmosis

A Hybrid NF-FO-RO Process for the Supply of Irrigation Water from Treated Wastewater: Simulation Study

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