Electrophoretic cross-flow filtration and electrodeionization: method for treating effluent waste and apparatus for use therewith
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United States of America Patent
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Feb 14, 2006
Grant Date -
Nov 20, 2003
app pub date -
Sep 14, 2001
filing date -
Sep 14, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention provides a method and apparatus for purifying effluent wastewater utilizing electrophoretic cross-flow filtration and electrodeionization. The method first comprises filtering the water in a cross-flow direction with a filter membrane (120) in the presence of an electric field that is operative to drive suspended particles away from a surface of the filter membrane (120). The permeate (134) containing dissolved solids is next passed through a mixture (188) of at least one cation-exchange resin and at least one anion-exchange resin disposed between a cation-selective membrane (184) and an anion-selective membrane (181) in the presence of an electric field. The electric field drives cations in the permeate through the cation-selective membrane (184), and drives anions in the permeate through the anion-selective membrane (181), thereby to form deionized water (192). The apparatus includes cell modules adapted to be used in plate-and-frame or radial flow configurations.
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