Performance modeling of direct contact membrane distillation (DCMD) seawater desalination process using a commercial composite membrane

Jung Gil Lee, Young Deuk Kim, Woo Seung Kim, Lijo Francis, Gary Amy, Noreddine Ghaffour

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

This paper presents the development of a rigorous theoretical model to predict the transmembrane flux of a flat sheet hydrophobic composite membrane, comprising both an active layer of polytetrafluoroethylene and a scrim-backing support layer of polypropylene, in the direct contact membrane distillation (DCMD) process. An integrated model includes the mass, momentum, species and energy balances for both retentate and permeate flows, coupled with the mass transfer of water vapor through the composite membrane and the heat transfer across the membrane and through the boundary layers adjacent to the membrane surfaces. Experimental results and model predictions for permeate flux and performance ratio are compared and shown to be in good agreement. The permeate flux through the composite layer can be ignored in the consideration of mass transfer pathways at the composite membrane. The effect of the surface porosity and the thickness of active and support layers on the process performance of composite membrane has also been studied. Among these parameters, surface porosity is identified to be the main factor significantly influencing the permeate flux and performance ratio, while the relative influence of the surface porosity on the performance ratio is less than that on flux.

Original languageEnglish
Pages (from-to)85-95
Number of pages11
JournalJournal of Membrane Science
Volume478
DOIs
Publication statusPublished - 5 Mar 2015
Externally publishedYes

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Keywords

  • Composite membrane
  • Desalination
  • Direct contact membrane distillation
  • Heat and mass transfer

ASJC Scopus subject areas

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

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