Deionization and desalination using electrostatic ion pumping
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United States of America Patent
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Jun 11, 2013
Grant Date -
Oct 20, 2011
app pub date -
Jun 14, 2011
filing date -
Jan 23, 2006
priority date (Note) -
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Abstract
The present invention provides a new method and apparatus/system for purifying ionic solutions, such as, for example, desalinating water, using engineered charged surfaces to sorb ions from such solutions. Surface charge is applied externally, and is synchronized with oscillatory fluid movements between substantially parallel charged plates. Ions are held in place during fluid movement in one direction (because they are held in the electrical double layer), and released for transport during fluid movement in the opposite direction by removing the applied electric field. In this way the ions, such as salt, are “ratcheted” across the charged surface from the feed side to the concentrate side. The process itself is very simple and involves only pumps, charged surfaces, and manifolds for fluid collection.
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