Chlorine-tolerant, desalination membrane could increase access to clean water
23 Jul 2008, 1447 Hrs

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Washington, July 23 (ANI): A team of scientists from the University of Texas at Austin has developed a chlorine-tolerant membrane that should simplify the water desalination process, increasing access to fresh water and possibly reducing greenhouse gases.

Professor Benny Freeman from the University of Texas worked primarily with James E. McGrath of Virginia Tech University and Ho Bum Park of the University of Ulsan in South Korea for more than three years to develop the chlorine-tolerant membrane made of sulfonated copolymers.

Chlorine must be added to water to disinfect it to prevent a biofilm (stemming from biological contaminants in the raw water) from forming on the membrane, which would reduce its performance.

It is then de-chlorinated prior to sending it through the currently used polyamide membranes, which don't tolerate chlorinated water.

"It promises to eliminate de-chlorination steps that are required currently to protect membranes from attack by chlorine in water," said Freeman. "We believe that even a small increase in efficiency should result in large cost savings," he added.

According to Freeman, "If we make the desalination process more efficient with better membranes, it will be less expensive to desalinate a gallon of water, which will expand the availability of clean water around the world."

The development could also have a direct impact on reducing carbon-dioxide emissions, which contribute to global warming.

Energy and water are inherently connected. One needs water to generate power (cooling water for electric power generation stations) and generation of pure water requires energy to separate the salt from the water.

That energy is often generated from the burning of fossil fuels, which leads inevitably to the generation of carbon dioxide.

"Therefore, if one can make desalination more energy-efficient by developing better membranes, such as those that we are working on, one could reduce the carbon footprint required to produce pure water," said Freeman.

According to McGrath, his research group developed novel materials based on an entirely different platform of membranes than those used today in desalination membranes.

These new materials are extremely tolerant to aqueous chlorine so their performance doesn't deteriorate in the presence of chlorine.

"Basically, Dr. McGrath radically changed the chemical composition of the membranes, relative to what is used commercially, and the new membranes do not have chemical linkages in them that are sensitive to attack by chlorine," said Freeman. (ANI)