Clean water might soon take a microscopic leap forward. Following the completion of the European Union’s Convert2Green initiative, researchers at the Fraunhofer Institute for Electron Beam and Plasma Technology FEP have unveiled a carbon nanomembrane (CNM) filtration system that outpaces usual reverse osmosis technology.

It filters water at five times the efficiency of existing industry standards. It slashes energy costs and integrates smoothly into existing manufacturing lines. Lower operational pressures enable lighter pump infrastructure, directly reducing industrial energy expenditures and equipment costs.

Most reverse osmosis systems rely on dense polymer membranes that require high hydraulic pressure and significant electrical energy to drive water flow. 

The development centers on carbon nanomembrane (CNM) polymer layers designed to a thickness of just a few nanometers. The ultra-thin polymer layer was engineered in partnership with startup CNM Technologies GmbH.

Carbon nanomembranes are single-molecule-thick, two-dimensional carbon networks that create tight molecular barriers. Conventional polyamide reverse osmosis membranes are relatively dense and thick, whereas these novel structures feature sub-nanometer pores. Water molecules move through these pores with minimal friction. Meanwhile, dissolved salt ions, complex organic compounds, and micro-contaminants are caught dead in their tracks.

In head-to-head laboratory testing, the CNM composite achieved a fivefold improvement in salt rejection over reverse osmosis setups while maintaining comparable fluid flow. For energy-heavy industrial purification plants, that means lower operating pressures, smaller footprints, and major power savings.

Conventional polymer membranes suffer performance degradation from biofouling and mineral scaling, which requires frequent chemical cleaning. 

Cross-linked carbon nanomembranes feature ultra-smooth surfaces and robust chemical resilience that extend operational lifespan.

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