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Updated: Jun 27, 2025
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Electrochemically and Bioelectrochemically Induced Ammonium Recovery
Published on: January 22, 2015
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Enhancing selective ammonium transport in membrane electrochemical systems
1Department of Civil and Environmental Engineering, University of Wisconsin-Madison, Madison, WI 53706, United States.
Water Research
|May 1, 2024
Summary
Recovering ammonia nitrogen from wastewater using membrane electrochemical systems (MES) is efficient. Mathematical modeling shows pH and sodium ions (Na+) impact ammonia transport, with Na+ enhancing recovery via Donnan dialysis.
Area of Science:
- Environmental Engineering
- Electrochemistry
- Separation Science
Background:
- Ammonia nitrogen recovery from wastewater offers sustainable nitrogen removal and fertilizer production.
- Membrane electrochemical systems (MES) are effective for ammonia recovery via ion transport through membranes.
- Understanding co-existing ion effects is crucial for optimizing MES performance.
Purpose of the Study:
- To develop a mathematical model for investigating co-existing ion impacts on ammonium transport in MES.
- To analyze the influence of pH and sodium ion (Na+) concentration on ammonia recovery efficiency.
- To elucidate the mechanisms governing selective ion transport in MES for ammonia recovery.
Main Methods:
- Development of a mathematical model to simulate ion transport in MES.
- Systematic investigation of pH effects on ammonium (NH4+) and sodium ion (Na+) transport.
- Assessment of varying Na+ concentrations on system performance and selectivity.
Main Results:
- pH significantly influences both NH4+ and Na+ transport.
- NH4+ dominates cation transport unless Na+ concentration is extremely high (>88.5%).
- Introducing Na+ into the cathode compartment enhances ammonia transport through Donnan dialysis.
Conclusions:
- Mathematical modeling provides insights into ion transport dynamics in MES for ammonia recovery.
- Optimizing pH and Na+ concentrations can improve selectivity and efficiency of ammonia recovery.
- Donnan dialysis effect highlights a strategy for enhanced ammonia transport in MES.
Keywords:
Donnan dialysisIon transportMembrane electrochemical systemSelective ammonia recoverySelectivityTransport numberMore Related Videos
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