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Electrodialysis

Posted by: AJ Kennedy

Campaign: How can you make drinkable water from the ocean?

Electrodialysis is kind of the opposite of osmosis. Rather than moving water across a membrane, electrodialysis moves particles in the water across the membrane by drawing them out with an electric charge. Salt, for example, is composed of charged ions that will break apart and move when an electric charge is applied to them. While this works well on salt, it doesn’t really help to weed out other contaminants that might be found in seawater, like dirt or microscopic organisms. But since electrodialysis tends to work faster and can desalinate larger quantities of water than other methods, researchers are working on ways to make the process better at eliminating other contaminants. New developments may be in the works, but electrodialysis, as a water-purification technology, has been around for decades. There are actually electrodialysis plants around the world, according to Desalination: Trends and Technologies, a 2011 book edited by Michael Schorr, on desalination. These include the US, Canada, Iran, and parts of Europe. Source: https://www.weforum.org/agenda/2015/03/4-ways-to-create-clean-drinking-water/


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