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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...

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Ion-Exchange Membranes for the Fabrication of Reverse Electrodialysis Device

Ion-Exchange Membranes for the Fabrication of Reverse Electrodialysis Device

Published on: July 20, 2021

Flow-electrode capacitive deionization (FCDI) scale-up using a membrane stack configuration.

Jinxing Ma¹, Junjun Ma², Changyong Zhang¹

¹UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW, 2052, Australia.

|October 27, 2019

Summary

This summary is machine-generated.

Flow-electrode capacitive deionization (FCDI) offers efficient brackish water desalination. A membrane stack configuration with two membrane pairs maximized salt removal and energy efficiency for potable water production.

Keywords:

Energy efficiency Flow-electrode capacitive deionization Membrane stack Productivity

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Area of Science:

Water treatment technologies
Electrochemical separation processes
Desalination

Background:

Flow-electrode capacitive deionization (FCDI) is a promising desalination method.
FCDI offers advantages over fixed-electrode capacitive deionization (CDI), including higher flow efficiency and easier electrode management.
Increasing treatment capacity is crucial for FCDI's practical application.

Purpose of the Study:

To enhance the treatment capacity of FCDI systems.
To investigate the impact of membrane stack configuration on FCDI performance.
To optimize FCDI for efficient brackish water desalination.

Main Methods:

Utilized a membrane stack configuration for FCDI.
Compared standardized metrics: average salt removal rate (ASRR), energy normalized removed salt (ENRS), and productivity.
Evaluated FCDI performance with varying numbers of ion exchange membrane pairs.

Main Results:

An FCDI system with two pairs of ion exchange membranes achieved the highest efficiency in desalting brackish water (1000 mg/L to ~150 mg/L).
This configuration yielded higher ASRR and ENRS compared to other configurations.
Increasing membrane pairs beyond two led to decreased current efficiency, likely due to electrodialysis dominance.

Conclusions:

FCDI with a membrane stack configuration demonstrates proof of concept for continuous desalination.
High energy efficiency (13.8%-20.2%) and productivity (>100 L/m²/h) were achieved.
The study provides insights for scaling up FCDI for energy-efficient water desalination.