Scarcity Of Potable Water In Indian Villages To End?

Electrodialysis works by passing a stream of water between two electrodes with opposite charges.

Because the salt dissolved in water consists of positive and negative ions, the electrodes pull the ions out of the water, leaving fresher water at the centre of the flow.

A series of membranes separate the freshwater stream from increasingly salty ones.

Both electrodialysis and reverse osmosis require the use of membranes, but those in an electrodialysis system are exposed to lower pressures and can be cleared of salt buildup simply by reversing the electrical polarity.

Electrodialysis systems recover a much higher percentage of the water - more than 90 percent - compared with about 40 to 60 percent from reverse-osmosis systems, a big advantage in areas where water is scarce.

Having carried out this analysis, Wright and Winter plan to put together a working prototype for field evaluations in India in January. The study appears in the journal Desalination.

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