New Aromatic Polyamide Reverse Osmosis Membranes to Prevent Biofilm Formation and Irreversible Chlorination

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Researchers at Purdue University have developed new reverse osmosis membranes to improve desalination while preventing biofilm formation. Network aromatic polyamides (NAP) are the current state-of-the-art technology for reverse osmosis membranes having potential to meet clean water and energy production demands of a growing global population. However, these membranes often accumulate biofilms which can be detrimental to water separation processes as this reduces water permeability and membrane salt selectivity. Chlorine is typically used as an oxidant to prevent biofilm formation on the surface of NAP-based reverse osmosis membranes but can lead to irreversible chlorination of aromatic rings in the membrane's chemical structure. Purdue researchers have created new NAP membranes that exhibit improved chlorine tolerance, significantly extending the membranes' performance life. In laboratory testing, the new membrane delayed chlorine-induced performance loss up to five times longer than traditional membranes.

-Improved long term salt rejection
-Improved long term flux maintenance

Potential Applications
-Water Filtration
-Reverse Osmosis Technology

Technology Validation:
Testing in labs comparing new membrane and traditional membranes showing five times better chlorine resistance
Dec 6, 2021
Provisional-Gov. Funding
United States

Dec 6, 2020
Provisional-Gov. Funding
United States
Purdue Office of Technology Commercialization
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