Pentagon Weapons-Maker Finds Method for Cheap, Clean Water

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Pentagon Weapons-Maker Finds Method for Cheap, Clean Water

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A boy is silhouetted against the setting sun while arranging bottles of drinking water for sale at 10 PKR ($0.11) along Karachi's Clifton beach March 15, 2012. World Water Day, which is celebrated on March 22, aims to focus on water and food security, according to the United Nations. REUTERS/Akhtar Soomro

Tuesday, March 19, 2013 - 11:30am

CONTENT: Article

By David Alexander 

(Reuters) – A defense contractor better known for building jet fighters and lethal missiles says it has found a way to slash the amount of energy needed to remove salt from seawater, potentially making it vastly cheaper to produce clean water at a time when scarcity has become a global security issue.

The process, officials and engineers at Lockheed Martin Corp say, would enable filter manufacturers to produce thin carbon membranes with regular holes about a nanometer in size that are large enough to allow water to pass through but small enough to block the molecules of salt in seawater. A nanometer is a billionth of a meter.

Because the sheets of pure carbon known as graphene are so thin – just one atom in thickness – it takes much less energy to push the seawater through the filter with the force required to separate the salt from the water, they said.

The development could spare underdeveloped countries from having to build exotic, expensive pumping stations needed in plants that use a desalination process called reverse osmosis.

“It’s 500 times thinner than the best filter on the market today and a thousand times stronger,” said John Stetson, the engineer who has been working on the idea. “The energy that’s required and the pressure that’s required to filter salt is approximately 100 times less.”

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