Israeli Solution Uses Sunlight For Desalination
Thousands of years ago, sailors would spread seawater in flat beds aboard ship to let the sun evaporate it to separate out the salt. The same principle is behind a modern Israeli technology that relies on sun power to distill clean water for drinking and agriculture.
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“About 97 percent of the world’s water is saltwater or polluted water,” says Shimmy Zimels, CEO of Jerusalem-based SunDwater. That is why some 750 million people in 45 countries need to drill expensive wells, buy bottled water or even use contaminated water despite the huge health risks.
SunDwater’s solar-powered distiller, about to hit the market, is targeted at these populations — particularly in Africa, South America and parts of Asia. It’s a “green,” low-cost, low-maintenance system that converts dirty or salty water into potable water without any need for infrastructure or an external energy source.
The water is pumped into the unit, which is outfitted with a four-square-meter (43-square-foot) round photovoltaic dish that concentrates the sunbeams for fast evaporation. The water vapor flows into a cylinder where it gets condensed back into freshwater.