Salt Concentration Differences Alter Membrane Resistance in Reverse Electrodialysis Stacks

Geoffrey M. Geise; Andrew J. Curtis; Marta C. Hatzell; Michael A. Hickner; Bruce E. Logan

doi:10.1021/ez4000719

Salt Concentration Differences Alter Membrane Resistance in Reverse Electrodialysis Stacks

Geoffrey M. Geise, Andrew J. Curtis, Marta C. Hatzell, Michael A. Hickner, Bruce E. Logan

Research output: Contribution to journal › Article › peer-review

101 Scopus citations

Abstract

Membrane ionic resistance is usually measured by immersing the membrane in a salt solution at a single, fixed concentration. While salt concentration is known to affect membrane resistance when the same concentration is used on both sides of the membrane, little is known about membrane resistance when the membrane is placed between solutions of different concentrations, such as in a reverse electrodialysis (RED) stack. Ionic resistance measurements obtained using Selemion CMV and AMV that separated sodium chloride and ammonium bicarbonate solutions of different concentrations were greater than those measured using only the high-concentration solution. Measured RED stack resistances showed good agreement with resistances calculated using an equivalent series resistance model, where the membranes accounted for 46% of the total stack resistance. The high area resistance of the membranes separating different salt concentration solutions has implications for modeling and optimizing membranes used in RED systems.

Original language	English (US)
Pages (from-to)	36-39
Number of pages	4
Journal	Environmental Science & Technology Letters
Volume	1
Issue number	1
DOIs	https://doi.org/10.1021/ez4000719
State	Published - Oct 7 2013
Externally published	Yes

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10.1021/ez4000719

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title = "Salt Concentration Differences Alter Membrane Resistance in Reverse Electrodialysis Stacks",

abstract = "Membrane ionic resistance is usually measured by immersing the membrane in a salt solution at a single, fixed concentration. While salt concentration is known to affect membrane resistance when the same concentration is used on both sides of the membrane, little is known about membrane resistance when the membrane is placed between solutions of different concentrations, such as in a reverse electrodialysis (RED) stack. Ionic resistance measurements obtained using Selemion CMV and AMV that separated sodium chloride and ammonium bicarbonate solutions of different concentrations were greater than those measured using only the high-concentration solution. Measured RED stack resistances showed good agreement with resistances calculated using an equivalent series resistance model, where the membranes accounted for 46% of the total stack resistance. The high area resistance of the membranes separating different salt concentration solutions has implications for modeling and optimizing membranes used in RED systems.",

author = "Geise, {Geoffrey M.} and Curtis, {Andrew J.} and Hatzell, {Marta C.} and Hickner, {Michael A.} and Logan, {Bruce E.}",

note = "KAUST Repository Item: Exported on 2020-10-01 Acknowledged KAUST grant number(s): KUS-I1-003-13 Acknowledgements: This research was supported by funding through the King Abdullah University of Science and Technology (KAUST) (Award KUS-I1-003-13) and the U.S. National Science Foundation (NSF) Research Experience for Undergraduates (REU) program (NSF Grant DMR 1156960). This publication acknowledges KAUST support, but has no KAUST affiliated authors.",

year = "2013",

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doi = "10.1021/ez4000719",

language = "English (US)",

volume = "1",

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journal = "Environmental Science & Technology Letters",

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publisher = "American Chemical Society",

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AU - Geise, Geoffrey M.

AU - Curtis, Andrew J.

AU - Hatzell, Marta C.

AU - Hickner, Michael A.

AU - Logan, Bruce E.

N1 - KAUST Repository Item: Exported on 2020-10-01 Acknowledged KAUST grant number(s): KUS-I1-003-13 Acknowledgements: This research was supported by funding through the King Abdullah University of Science and Technology (KAUST) (Award KUS-I1-003-13) and the U.S. National Science Foundation (NSF) Research Experience for Undergraduates (REU) program (NSF Grant DMR 1156960). This publication acknowledges KAUST support, but has no KAUST affiliated authors.

PY - 2013/10/7

Y1 - 2013/10/7

N2 - Membrane ionic resistance is usually measured by immersing the membrane in a salt solution at a single, fixed concentration. While salt concentration is known to affect membrane resistance when the same concentration is used on both sides of the membrane, little is known about membrane resistance when the membrane is placed between solutions of different concentrations, such as in a reverse electrodialysis (RED) stack. Ionic resistance measurements obtained using Selemion CMV and AMV that separated sodium chloride and ammonium bicarbonate solutions of different concentrations were greater than those measured using only the high-concentration solution. Measured RED stack resistances showed good agreement with resistances calculated using an equivalent series resistance model, where the membranes accounted for 46% of the total stack resistance. The high area resistance of the membranes separating different salt concentration solutions has implications for modeling and optimizing membranes used in RED systems.

AB - Membrane ionic resistance is usually measured by immersing the membrane in a salt solution at a single, fixed concentration. While salt concentration is known to affect membrane resistance when the same concentration is used on both sides of the membrane, little is known about membrane resistance when the membrane is placed between solutions of different concentrations, such as in a reverse electrodialysis (RED) stack. Ionic resistance measurements obtained using Selemion CMV and AMV that separated sodium chloride and ammonium bicarbonate solutions of different concentrations were greater than those measured using only the high-concentration solution. Measured RED stack resistances showed good agreement with resistances calculated using an equivalent series resistance model, where the membranes accounted for 46% of the total stack resistance. The high area resistance of the membranes separating different salt concentration solutions has implications for modeling and optimizing membranes used in RED systems.

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JO - Environmental Science & Technology Letters

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ER -

Salt Concentration Differences Alter Membrane Resistance in Reverse Electrodialysis Stacks

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