Method and apparatus for reducing the total dissolved solids of a solution
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United States of America Patent
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Jun 21, 2016
Grant Date -
Mar 7, 2013
app pub date -
Sep 1, 2011
filing date -
Sep 1, 2011
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Abstract
In a method and apparatus for reducing the total dissolved solids of a solution, a feed solution is conveyed to at least one first chamber of a unit, and a draw solution is conveyed to at least one second chamber thereof. A semi-permeable member arrangement is disposed between the chambers. The draw solution has a greater molar concentration than does the feed solution. Solvent from the feed solution is drawn through the membrane arrangement into the draw solution, reducing the solute concentration of the draw solution and increasing the solid concentration of the feed solution. Paddles provide continuous sweeping of opposite external surfaces of the membranes to reduce solute depositions on the surface facing the feed solution chamber, and to remove liquid permeate molecules from that external surface of the membranes that faces a draw solution chamber.
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