Total water production capacity inversion phenomenon in multi-stage direct contact membrane distillation: A theoretical study

Handle URI:
http://hdl.handle.net/10754/625463
Title:
Total water production capacity inversion phenomenon in multi-stage direct contact membrane distillation: A theoretical study
Authors:
Lee, Jung Gil; Alsaadi, Ahmad Salem ( 0000-0002-5334-8305 ) ; Karam, Ayman M. ( 0000-0003-4130-330X ) ; Francis, Lijo; Soukane, Sofiane; Ghaffour, Noreddine ( 0000-0003-2095-4736 )
Abstract:
The low thermal efficiency and low water production are among the major challenges that prevent membrane distillation (MD) process from being commercialized. In an effort to design an efficient multi-stage direct contact MD (DCMD) unit through mathematical simulation, a new phenomenon that we refer to as total water production capacity inversion (WPI) has been detected. It is represented by a decrease in the total water production beyond a number of stages or a certain module length. WPI phenomenon, which was confirmed by using two different mathematical models validated experimentally, was found to take place due to the decrease in water vapor flux across the membrane as well as the increase in heat loss by conduction as the membrane length increases. Therefore, WPI should be considered as a critical MD design-criterion, especially for large scale units. Investigations conducted for a simulated multi-stage DCMD process showed that inlet feed and permeate temperatures difference, feed and permeate flow rates, and feed salinity have different effects on WPI. The number of stages (or module length at constant width) that leads to a maximum water production has been determined for different operating parameters. Decreasing inlet feed and permeate temperatures difference, or inlet feed and permeate flow rates and increasing inlet feed temperature at constant temperature difference or inlet feed salinity cause the WPI to take place at lower number of stages. Even though the feed salinity affects negligibly the mean permeate flux, it was clearly shown that it can affect WPI. The results presented herein unveil a hidden phenomenon that is likely to occur during process scale-up procedures and should be considered by process engineers for a proper choice of system design and operating conditions.
KAUST Department:
Biological and Environmental Sciences and Engineering (BESE) Division; Water Desalination and Reuse Research Center (WDRC); Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
Citation:
Lee J-G, Alsaadi AS, Karam AM, Francis L, Soukane S, et al. (2017) Total water production capacity inversion phenomenon in multi-stage direct contact membrane distillation: A theoretical study. Journal of Membrane Science. Available: http://dx.doi.org/10.1016/j.memsci.2017.09.020.
Publisher:
Elsevier BV
Journal:
Journal of Membrane Science
Issue Date:
9-Sep-2017
DOI:
10.1016/j.memsci.2017.09.020
Type:
Article
ISSN:
0376-7388
Sponsors:
The research reported in this paper was supported by King Abdullah University of Science and Technology (KAUST), Saudi Arabia. The authors acknowledge help, assistance and support from the Water Desalination and Reuse Center (WDRC) staff.
Additional Links:
http://www.sciencedirect.com/science/article/pii/S0376738817322469
Appears in Collections:
Articles; Water Desalination and Reuse Research Center (WDRC); Biological and Environmental Sciences and Engineering (BESE) Division; Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorLee, Jung Gilen
dc.contributor.authorAlsaadi, Ahmad Salemen
dc.contributor.authorKaram, Ayman M.en
dc.contributor.authorFrancis, Lijoen
dc.contributor.authorSoukane, Sofianeen
dc.contributor.authorGhaffour, Noreddineen
dc.date.accessioned2017-09-14T06:03:52Z-
dc.date.available2017-09-14T06:03:52Z-
dc.date.issued2017-09-09en
dc.identifier.citationLee J-G, Alsaadi AS, Karam AM, Francis L, Soukane S, et al. (2017) Total water production capacity inversion phenomenon in multi-stage direct contact membrane distillation: A theoretical study. Journal of Membrane Science. Available: http://dx.doi.org/10.1016/j.memsci.2017.09.020.en
dc.identifier.issn0376-7388en
dc.identifier.doi10.1016/j.memsci.2017.09.020en
dc.identifier.urihttp://hdl.handle.net/10754/625463-
dc.description.abstractThe low thermal efficiency and low water production are among the major challenges that prevent membrane distillation (MD) process from being commercialized. In an effort to design an efficient multi-stage direct contact MD (DCMD) unit through mathematical simulation, a new phenomenon that we refer to as total water production capacity inversion (WPI) has been detected. It is represented by a decrease in the total water production beyond a number of stages or a certain module length. WPI phenomenon, which was confirmed by using two different mathematical models validated experimentally, was found to take place due to the decrease in water vapor flux across the membrane as well as the increase in heat loss by conduction as the membrane length increases. Therefore, WPI should be considered as a critical MD design-criterion, especially for large scale units. Investigations conducted for a simulated multi-stage DCMD process showed that inlet feed and permeate temperatures difference, feed and permeate flow rates, and feed salinity have different effects on WPI. The number of stages (or module length at constant width) that leads to a maximum water production has been determined for different operating parameters. Decreasing inlet feed and permeate temperatures difference, or inlet feed and permeate flow rates and increasing inlet feed temperature at constant temperature difference or inlet feed salinity cause the WPI to take place at lower number of stages. Even though the feed salinity affects negligibly the mean permeate flux, it was clearly shown that it can affect WPI. The results presented herein unveil a hidden phenomenon that is likely to occur during process scale-up procedures and should be considered by process engineers for a proper choice of system design and operating conditions.en
dc.description.sponsorshipThe research reported in this paper was supported by King Abdullah University of Science and Technology (KAUST), Saudi Arabia. The authors acknowledge help, assistance and support from the Water Desalination and Reuse Center (WDRC) staff.en
dc.publisherElsevier BVen
dc.relation.urlhttp://www.sciencedirect.com/science/article/pii/S0376738817322469en
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Journal of Membrane Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Membrane Science, [, , (2017-09-09)] DOI: 10.1016/j.memsci.2017.09.020 . © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectThermal equilibriumen
dc.subjectDCMD module scale-upen
dc.subjectTotal water productionen
dc.subjectTotal heat fluxen
dc.subjectConduction heat lossen
dc.titleTotal water production capacity inversion phenomenon in multi-stage direct contact membrane distillation: A theoretical studyen
dc.typeArticleen
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.contributor.departmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Divisionen
dc.identifier.journalJournal of Membrane Scienceen
dc.eprint.versionPost-printen
dc.contributor.institutionInstitute of Marine Science and Coastal Management, Campus Universitaire de Dely Ibrahim, Bois des Cars, BP 19, 16320, Algiers, Algeriaen
kaust.authorLee, Jung Gilen
kaust.authorAlsaadi, Ahmad Salemen
kaust.authorKaram, Ayman M.en
kaust.authorFrancis, Lijoen
kaust.authorGhaffour, Noreddineen
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