A general, resistance-in-series, salt- and water flux models for forward osmosis and pressure-retarded osmosis for energy generation

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Abstract

A general mass transport model of forward osmosis and pressure retarded osmosis has been developed and presented in this paper. Essential of this model is that it takes into account the effect of all mass transport layers of this process, namely the external boundary layers on both sides of the membrane, the dense and the sponge layers of an asymmetric membrane used, applying the diffusive-convective mass transport equation for every sub-layer except of the skin/dense layer of the membrane. A widely applied, "diffusive" transport equation was used for the dense layer, for the salt transport through it. The water flux and the energy density obtained by means of the presented and the literature models have been compared in the paper in order to test the model developed. It was shown, that the general model presented describes the process performance under all operating conditions independently of the values of the mass transport parameters, namely of the external and internal polarization layers, salt- and water permeability coefficients or inlet concentrations of the fluid phases and hydraulic pressure difference.

Original languageEnglish
Pages (from-to)71-81
Number of pages11
JournalJournal of Membrane Science
Volume460
DOIs
Publication statusPublished - Jun 15 2014

Fingerprint

Osmosis
osmosis
Salts
Fluxes
salts
Pressure
Mass transfer
Membranes
Water
water
Porifera
membranes
energy
Permeability
Hydraulic conductivity
Skin
Boundary layers
hydraulics
Hydraulics
boundary layers

Keywords

  • Diffusive-convective mass transfer
  • Forward osmosis
  • Pressure retarded osmosis
  • Renewable energy production
  • Salt flux
  • Water flux

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Materials Science(all)
  • Biochemistry
  • Filtration and Separation

Cite this

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abstract = "A general mass transport model of forward osmosis and pressure retarded osmosis has been developed and presented in this paper. Essential of this model is that it takes into account the effect of all mass transport layers of this process, namely the external boundary layers on both sides of the membrane, the dense and the sponge layers of an asymmetric membrane used, applying the diffusive-convective mass transport equation for every sub-layer except of the skin/dense layer of the membrane. A widely applied, {"}diffusive{"} transport equation was used for the dense layer, for the salt transport through it. The water flux and the energy density obtained by means of the presented and the literature models have been compared in the paper in order to test the model developed. It was shown, that the general model presented describes the process performance under all operating conditions independently of the values of the mass transport parameters, namely of the external and internal polarization layers, salt- and water permeability coefficients or inlet concentrations of the fluid phases and hydraulic pressure difference.",
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N2 - A general mass transport model of forward osmosis and pressure retarded osmosis has been developed and presented in this paper. Essential of this model is that it takes into account the effect of all mass transport layers of this process, namely the external boundary layers on both sides of the membrane, the dense and the sponge layers of an asymmetric membrane used, applying the diffusive-convective mass transport equation for every sub-layer except of the skin/dense layer of the membrane. A widely applied, "diffusive" transport equation was used for the dense layer, for the salt transport through it. The water flux and the energy density obtained by means of the presented and the literature models have been compared in the paper in order to test the model developed. It was shown, that the general model presented describes the process performance under all operating conditions independently of the values of the mass transport parameters, namely of the external and internal polarization layers, salt- and water permeability coefficients or inlet concentrations of the fluid phases and hydraulic pressure difference.

AB - A general mass transport model of forward osmosis and pressure retarded osmosis has been developed and presented in this paper. Essential of this model is that it takes into account the effect of all mass transport layers of this process, namely the external boundary layers on both sides of the membrane, the dense and the sponge layers of an asymmetric membrane used, applying the diffusive-convective mass transport equation for every sub-layer except of the skin/dense layer of the membrane. A widely applied, "diffusive" transport equation was used for the dense layer, for the salt transport through it. The water flux and the energy density obtained by means of the presented and the literature models have been compared in the paper in order to test the model developed. It was shown, that the general model presented describes the process performance under all operating conditions independently of the values of the mass transport parameters, namely of the external and internal polarization layers, salt- and water permeability coefficients or inlet concentrations of the fluid phases and hydraulic pressure difference.

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