Osmotic pressure estimation using the Pitzer equation for forward osmosis modelling

M. Khraisheh, N. Dawas, M. S. Nasser, Jaber Al Marri, Muataz Atieh, S. Adham, G. McKay

Research output: Contribution to journalArticle

Abstract

Forward osmosis (FO) has received widespread recognition in the past decade due to its potential low energy production of water. This study presents a new model analysis for predicting the water flux in FO systems when inorganic-based draw solutions are used under variable experimental conditions for using a laboratory scale cross-flow single cell unit. The new model accounts for the adverse impact of concentration polarization (both ICP and ECP) incorporating the water activity by Pitzer to calculate the bulk osmotic pressures. Using the water activity provides a better correlation of experimental data than the classical van’t Hoff equation. The nonlinear model also gave a better estimate for the structural parameter factor (S) of the membrane in its solution. Furthermore, the temperature and concentration of both the draw and feed solutions played a significant role in increasing the water flux, which could be interpreted in terms of the mass transfer coefficient representing ECP; a factor sensitive to the hydraulics of the system. The model provides greatly improved correlations for the experimental water fluxes.

Original languageEnglish
JournalEnvironmental Technology (United Kingdom)
DOIs
Publication statusPublished - 1 Jan 2019

Fingerprint

Osmosis
osmosis
Water
modeling
Fluxes
water
mass transfer
Mass transfer
polarization
Hydraulics
Polarization
membrane
Membranes
hydraulics
temperature

Keywords

  • draw solution
  • Forward osmosis
  • membrane separation
  • osmotic pressure
  • water flux modelling

ASJC Scopus subject areas

  • Environmental Chemistry
  • Water Science and Technology
  • Waste Management and Disposal

Cite this

Osmotic pressure estimation using the Pitzer equation for forward osmosis modelling. / Khraisheh, M.; Dawas, N.; Nasser, M. S.; Al Marri, Jaber; Atieh, Muataz; Adham, S.; McKay, G.

In: Environmental Technology (United Kingdom), 01.01.2019.

Research output: Contribution to journalArticle

@article{9bb44bb02290482baa19332f2460d202,
title = "Osmotic pressure estimation using the Pitzer equation for forward osmosis modelling",
abstract = "Forward osmosis (FO) has received widespread recognition in the past decade due to its potential low energy production of water. This study presents a new model analysis for predicting the water flux in FO systems when inorganic-based draw solutions are used under variable experimental conditions for using a laboratory scale cross-flow single cell unit. The new model accounts for the adverse impact of concentration polarization (both ICP and ECP) incorporating the water activity by Pitzer to calculate the bulk osmotic pressures. Using the water activity provides a better correlation of experimental data than the classical van’t Hoff equation. The nonlinear model also gave a better estimate for the structural parameter factor (S) of the membrane in its solution. Furthermore, the temperature and concentration of both the draw and feed solutions played a significant role in increasing the water flux, which could be interpreted in terms of the mass transfer coefficient representing ECP; a factor sensitive to the hydraulics of the system. The model provides greatly improved correlations for the experimental water fluxes.",
keywords = "draw solution, Forward osmosis, membrane separation, osmotic pressure, water flux modelling",
author = "M. Khraisheh and N. Dawas and Nasser, {M. S.} and {Al Marri}, Jaber and Muataz Atieh and S. Adham and G. McKay",
year = "2019",
month = "1",
day = "1",
doi = "10.1080/09593330.2019.1575476",
language = "English",
journal = "Environmental Technology (United Kingdom)",
issn = "0959-3330",
publisher = "Taylor and Francis Ltd.",

}

TY - JOUR

T1 - Osmotic pressure estimation using the Pitzer equation for forward osmosis modelling

AU - Khraisheh, M.

AU - Dawas, N.

AU - Nasser, M. S.

AU - Al Marri, Jaber

AU - Atieh, Muataz

AU - Adham, S.

AU - McKay, G.

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Forward osmosis (FO) has received widespread recognition in the past decade due to its potential low energy production of water. This study presents a new model analysis for predicting the water flux in FO systems when inorganic-based draw solutions are used under variable experimental conditions for using a laboratory scale cross-flow single cell unit. The new model accounts for the adverse impact of concentration polarization (both ICP and ECP) incorporating the water activity by Pitzer to calculate the bulk osmotic pressures. Using the water activity provides a better correlation of experimental data than the classical van’t Hoff equation. The nonlinear model also gave a better estimate for the structural parameter factor (S) of the membrane in its solution. Furthermore, the temperature and concentration of both the draw and feed solutions played a significant role in increasing the water flux, which could be interpreted in terms of the mass transfer coefficient representing ECP; a factor sensitive to the hydraulics of the system. The model provides greatly improved correlations for the experimental water fluxes.

AB - Forward osmosis (FO) has received widespread recognition in the past decade due to its potential low energy production of water. This study presents a new model analysis for predicting the water flux in FO systems when inorganic-based draw solutions are used under variable experimental conditions for using a laboratory scale cross-flow single cell unit. The new model accounts for the adverse impact of concentration polarization (both ICP and ECP) incorporating the water activity by Pitzer to calculate the bulk osmotic pressures. Using the water activity provides a better correlation of experimental data than the classical van’t Hoff equation. The nonlinear model also gave a better estimate for the structural parameter factor (S) of the membrane in its solution. Furthermore, the temperature and concentration of both the draw and feed solutions played a significant role in increasing the water flux, which could be interpreted in terms of the mass transfer coefficient representing ECP; a factor sensitive to the hydraulics of the system. The model provides greatly improved correlations for the experimental water fluxes.

KW - draw solution

KW - Forward osmosis

KW - membrane separation

KW - osmotic pressure

KW - water flux modelling

UR - http://www.scopus.com/inward/record.url?scp=85062336367&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85062336367&partnerID=8YFLogxK

U2 - 10.1080/09593330.2019.1575476

DO - 10.1080/09593330.2019.1575476

M3 - Article

JO - Environmental Technology (United Kingdom)

JF - Environmental Technology (United Kingdom)

SN - 0959-3330

ER -