Researchers Developed Ammonia-Removing Wastewater Membrane
The RuO2@PbO2-M membrane enables rapid nitrogen removal without external chemical precursors, according to a 2025 study.
Updated on Sept. 19, 2026 in Chemistry
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On July 16, 2025, researchers introduced an electro-filtration membrane capable of removing 99.6% of total nitrogen from wastewater. The research-stage technology functions by converting ammonia into nitrogen gas through an electrochemical process.
Why it matters
This method offers a potential pathway for treating complex wastewater streams more efficiently by eliminating the need for added chemical precursors. By accelerating nitrogen removal, the process could reduce the environmental burden of untreated industrial and agricultural runoff.
The RuO2@PbO2-M membrane achieved a 99.6% nitrogen removal rate with a 1.2-minute retention time. Optimal performance was demonstrated at a current density of 20 mA/cm² in the presence of 100 mg/L of chloride ions.
The players
Engineering Journal
A peer-reviewed publication focusing on advancements in engineering and materials science research.
The details
The membrane is synthesized via an electrodeposition-coupled template method, creating a structure that utilizes ruthenium dioxide and lead dioxide. When operating, the anode generates chlorine oxide radicals that oxidize pollutants. The presence of chloride ions in wastewater facilitates the creation of reactive chlorine species, which further aids in the breakdown of organic contaminants by 68% during continuous operation.
Timeline
July 16, 2025: The research results were published in the journal Engineering.
The Tech Race
This development contributes to the ongoing evolution of electrochemical advanced oxidation processes by refining anode material performance. It marks a departure from traditional chemical precipitation by integrating filtration and oxidation into a single membrane-based system.
This technology is currently in the research phase and is not yet available for commercial or municipal wastewater treatment workflows. Future implementation will depend on proving the membrane's durability and cost-effectiveness at industrial scales.
The takeaway
The study demonstrates that integrating ruthenium and lead dioxides into filtration membranes can significantly accelerate nitrogen removal. Researchers should now focus on the longevity of the membrane surface and scalability beyond the initial 70-hour testing window.
Further reading
For more information on the evolving field of industrial filtration, see our section on Chemistry.
More information
View the full results in the research paper in Engineering journal.
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