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Filter Purifies Water 80,000 Times Faster

by Rathi Manohar on September 02, 2010 at 6:57 PM General Health News

Plain cotton cloth dipped in a high-tech broth that has silver nanowires and carbon nanotubes makes an effective filter that purifies water 80,000 times faster,researchers at Stanford have discovered.

Filter Purifies Water 80,000 Times Faster

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Instead of physically trapping bacteria as most existing filters do, the new filter lets them flow on through with the water.

But by the time the pathogens have passed through, they have also passed on, because the device kills them with an electrical field that runs through the highly conductive "nano-coated" cotton.

In lab tests, over 98 percent of Escherichia coli bacteria that were exposed to 20 volts of electricity in the filter for several seconds were killed.

Multiple layers of fabric were used to make the filter 2.5 inches thick.

"This really provides a new water treatment method to kill pathogens. It can easily be used in remote areas where people don't have access to chemical treatments such as chlorine," said Yi Cui, an associate professor of materials science and engineering.

Cui said the new filter could be used in water purification systems from cities to small villages.

Filters that physically trap bacteria must have pore spaces small enough to keep the pathogens from slipping through, but that restricts the filters' flow rate.

Since the new filter doesn't trap bacteria, it can have much larger pores, allowing water to speed through at a more rapid rate.

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Filter Purifies Water 80,000 Times Faster

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