Forward Osmosis: Mass Transmission Coefficient-Based Models for Evaluation of Concentration Polarization under Different Conditions

Kang Rong, Tian C. Zhang

Research output: Contribution to journalArticle

Abstract

In the past, forward osmosis (FO) models were developed to evaluate the effects of concentration polarization (CP), including external CP (ECP) and internal CP (ICP), on FO performance. However, these models are not clear about the reverse salt flux of FO membranes because they often assume the osmosis reflection coefficient σ to be 1. In addition, these models need some empirical parameters that are difficult to obtain via experiments. In this study, a new set of FO models was developed, for the first time, on the basis of mass transmission coefficient (MT) and σ. These models were used to evaluate the impact of ECP and ICP on FO performance under the influence of different parameters and conditions. Data from previous studies were used to verify the models based on experimental and model-calculated MT. Sensitivity analysis was conducted for these models to find the most sensitive parameters to ECP, ICP, MT, and FO water flux Jv. Results indicate that σ is the most relatively influential parameter to concentrative ECP or concentrative ICP, revealing the FO membrane's reverse salt flux. The models developed can be used to analyze how ECP, ICP, and MT change under different FO systems and experimental conditions, including FO reactor configuration, mixing intensity, water velocity, FO membranes, and draw-solution concentration.

Original languageEnglish (US)
Article number04017095
JournalJournal of Environmental Engineering (United States)
Volume144
Issue number2
DOIs
StatePublished - Feb 1 2018

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Osmosis
osmosis
polarization
Polarization
Osmosis membranes
Fluxes
membrane
Salts
evaluation
Water
salt
Sensitivity analysis
sensitivity analysis

Keywords

  • Concentration polarization
  • Forward osmosis
  • Mass transmission coefficient
  • Osmosis reflection coefficient

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Civil and Structural Engineering
  • Environmental Science(all)

Cite this

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title = "Forward Osmosis: Mass Transmission Coefficient-Based Models for Evaluation of Concentration Polarization under Different Conditions",
abstract = "In the past, forward osmosis (FO) models were developed to evaluate the effects of concentration polarization (CP), including external CP (ECP) and internal CP (ICP), on FO performance. However, these models are not clear about the reverse salt flux of FO membranes because they often assume the osmosis reflection coefficient σ to be 1. In addition, these models need some empirical parameters that are difficult to obtain via experiments. In this study, a new set of FO models was developed, for the first time, on the basis of mass transmission coefficient (MT) and σ. These models were used to evaluate the impact of ECP and ICP on FO performance under the influence of different parameters and conditions. Data from previous studies were used to verify the models based on experimental and model-calculated MT. Sensitivity analysis was conducted for these models to find the most sensitive parameters to ECP, ICP, MT, and FO water flux Jv. Results indicate that σ is the most relatively influential parameter to concentrative ECP or concentrative ICP, revealing the FO membrane's reverse salt flux. The models developed can be used to analyze how ECP, ICP, and MT change under different FO systems and experimental conditions, including FO reactor configuration, mixing intensity, water velocity, FO membranes, and draw-solution concentration.",
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AB - In the past, forward osmosis (FO) models were developed to evaluate the effects of concentration polarization (CP), including external CP (ECP) and internal CP (ICP), on FO performance. However, these models are not clear about the reverse salt flux of FO membranes because they often assume the osmosis reflection coefficient σ to be 1. In addition, these models need some empirical parameters that are difficult to obtain via experiments. In this study, a new set of FO models was developed, for the first time, on the basis of mass transmission coefficient (MT) and σ. These models were used to evaluate the impact of ECP and ICP on FO performance under the influence of different parameters and conditions. Data from previous studies were used to verify the models based on experimental and model-calculated MT. Sensitivity analysis was conducted for these models to find the most sensitive parameters to ECP, ICP, MT, and FO water flux Jv. Results indicate that σ is the most relatively influential parameter to concentrative ECP or concentrative ICP, revealing the FO membrane's reverse salt flux. The models developed can be used to analyze how ECP, ICP, and MT change under different FO systems and experimental conditions, including FO reactor configuration, mixing intensity, water velocity, FO membranes, and draw-solution concentration.

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