Mass-transfer modeling of reverse-osmosis performance on 0.5–2% salty water

Hung, Ling-Yung; Lue, Shingjiang Jessie; You, Jiann-Hwa

doi:10.1016/j.desal.2010.07.033

Cited by 23 publications

(10 citation statements)

References 14 publications

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“…Models for mass transfer in the spiral-wound RO membrane element are discussed in the literature [33,35,[72][73][74][75][76][77][78][79][80][81][82][83][84][85][86][87][88].…”

Section: Models Of the Ro Process 21 Mass Transfer Modelmentioning

confidence: 99%

How RO membrane permeability and other performance factors affect process cost and energy use: A review

2019

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Reverse osmosis (RO) technology has progressed steadily over the last few decades. Those gains were achieved through improvements in both RO membrane element performance and energy recovery technologies. However, some recent literature indicates that RO membrane water permeability is approaching performance limits imposed by transport processes and thermodynamic constraints. This paper reviews how RO membrane element performance affects the cost of RO processes, especially the specific energy consumption. RO membrane performance encompasses water permeability, salt permeability, and other some characteristics of the RO element. This paper considers not only conventional RO processes, but also the recently proposed closed-circuit RO and batch RO processes. Even if the membrane water permeability increases, little additional effect is found when the membrane water permeability exceeds around 3 LMH/bar for seawater RO and 8 LMH/bar for brackish water RO in conventional single-stage RO. Increasing membrane water permeability has the potential to decrease membrane surface area and associated costs. A major limitation of most existing literature is that performance is evaluation on in terms of the initial operating conditions. Chronological changes, such as result from fouling, must also be considered to accurately validate how membrane element performance affects RO cost.

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“…Models for mass transfer in the spiral-wound RO membrane element are discussed in the literature [33,35,[72][73][74][75][76][77][78][79][80][81][82][83][84][85][86][87][88].…”

Section: Models Of the Ro Process 21 Mass Transfer Modelmentioning

confidence: 99%

How RO membrane permeability and other performance factors affect process cost and energy use: A review

2019

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“…Although significant advances have been reported in membrane transport models [6], the effect of feed concentration on the transport properties of salt and water is usually neglected. Furthermore, reported studies in literature focus on the performance of the membranes in the brackish water range (up to 20 g.L -1 NaCl) [7]. The available data for RO membranes in high recovery applications are usually limited to averaged values of salt and water fluxes at set operating conditions, or to a limited range of membranes [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

On the influence of salt concentration on the transport properties of reverse osmosis membranes in high pressure and high recovery desalination

Ebrahim

Karan

Livingston

2020

Journal of Membrane Science

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“…Among the earliest contributions is the popular “gel layer” polarization model [20]. Further analytical contributions have extended the earliest approaches to more realistic concentration boundary layers [21,22,23,24,25,26,27,28,29,30]. Note that these models suppose the existence of a thin film wherein polarization occurs, the axis-evolution of this film being potentially envisaged in the most recent ones.…”

Section: Introductionmentioning

confidence: 99%

Simple Theoretical Results on Reversible Fouling in Cross-Flow Membrane Filtration

et al. 2019

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In cross-flow membrane filtration, fouling results from material deposit which clogs the membrane inner surface. This hinders filtration, which experiences the so-called limiting flux. Among the models proposed by the literature, we retain a simple one: a steady-state reversible fouling is modelled with the use of a single additional parameter, i.e., N d , the ratio of the critical concentration for deposition to the feed concentration at inlet. To focus on fouling, viscous pressure drop and osmotic (counter-)pressure have been chosen low. It results in a minimal model of fouling. Solved thoroughly with the numerical means appropriate to enforce the nonlinear coupling between permeation and concentration polarization, the model delivers novel information. It first shows that permeation is utterly governed by solute transfer, the relevant non-dimensional quantities being hence limited to N d and P e i n , the transverse Péclet number. Furthermore, when the role played by N d and moderate P e i n (say P e i n < 40 ) is investigated, all results can be interpreted with the use of a single non-dimensional parameter, F l , the so-called fouling number, which simply reads F l ≡ P e i n N d - 1 . Now rendered possible, the overall fit of the numerical data allows us to put forward analytical final expressions, which involve all the physical parameters and allow us to retrieve the experimental trends.

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Mass-transfer modeling of reverse-osmosis performance on 0.5–2% salty water

Cited by 23 publications

References 14 publications

How RO membrane permeability and other performance factors affect process cost and energy use: A review

How RO membrane permeability and other performance factors affect process cost and energy use: A review

On the influence of salt concentration on the transport properties of reverse osmosis membranes in high pressure and high recovery desalination

Simple Theoretical Results on Reversible Fouling in Cross-Flow Membrane Filtration

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