Nanofiber Filters Eliminate Contaminants
- Created: Sunday, 01 November 2009
Since Argonide’s nanoalumina filtration media was first featured in Spinoff 2004, its production has expanded, thanks to a licensing agreement that has resulted in a host of new applications and recognitions. In 2006, the company exclusively licensed the filter media to Ahlstrom Corporation, a leading specialty paper and nonwoven roll goods manufacturer, headquartered in Finland, with multiple plants and offices in the United States. Ahlstrom began mass-producing and globally promoting the technology under the name Disruptor.
Ahlstrom’s large-scale production capabilities gave Argonide access to mass quantities of the nanofiber roll media for large-scale production of its NanoCeram filter cartridges. It scaled up the size of its cartridges, ultimately producing 4½-inch-diameter by 40-inch-long cartridges, which according to Tepper allowed Argonide to move beyond the retail market and into the industrial and municipal sectors.
In mid-2007, Argonide’s new NanoCeram filters caught the eye of major automobile manufacturer Toyota. Concerned with reducing the size of its U.S. plants’ “water footprint”—the amount of water the plants consume—the company had committed to scaling back its water use during manufacturing from the Toyota-standard 900 gallons per car to 300 gallons. In order to purify recycled water, Toyota uses reverse osmosis (RO) membranes, which tend to foul easily, even with the use of standard prefilters. Toyota was using prefilters that let through too many RO-membrane-fouling particles; in one plant, this required the expensive membranes to be replaced every 2 to 3 months. Since utilizing the NanoCeram cartridges as prefilters in that plant, the RO membranes have yet to require cleaning or replacement. Toyota has also used NanoCeram filters to cleanse the roughly 16 miles of chill water pipes in a typical plant. The filters have solved a long-standing corrosion problem by removing its cause: iron oxide and the bacteria that feeds on it.
Argonide’s filtration media continues to evolve. Ahlstrom is now producing the nanoalumina media with a new component: powdered activated carbon (PAC), which is retained by the nanofibers and enhances the media’s filtration abilities even further. The Disruptor PAC media, which Argonide uses to create its NanoCeram PAC cartridges, has been certified for the purification of drinking water by NSF International, a nonprofit, nongovernmental group that certifies products for public health and safety. Tepper notes that the nanoalumina media can retain virtually any nanopowder desired, meaning it can be adapted to remove specific contaminants from water.
That kind of efficiency and versatility has the nanofiber media poised to be a major player in a number of burgeoning applications. Tepper expects that, by 2011, the U.S. Environmental Protection Agency (EPA) will require municipalities to monitor their water for viruses. (Currently, only bacteria monitoring is required, though Tepper says viruses cause roughly 50 percent of waterborne gastrointestinal illnesses.) The EPA has expressed satisfaction with the NanoCeram filter as a virus sample collector in such a monitoring capacity. In addition, “The desalination business is growing by leaps and bounds,” says Tepper, who points out that the RO membranes used in extracting fresh water from our planet’s oceans will benefit, like Toyota’s, from NanoCeram prefilters that remove the cellular material that causes membrane biofouling. And, he notes, all municipal water ultimately will be RO treated as well, providing another opportunity for Argonide and NASA to benefit Earth’s water supplies.
NanoCeram® is a registered trademark of Argonide Corporation.
Disruptor™ is a trademark of Ahlstrom Corporation.