Electrodeionization and ultraviolet light treatment method for purifying water
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United States of America Patent
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May 26, 1992
Grant Date -
N/A
app pub date -
Sep 8, 1989
filing date -
Sep 8, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process is provided for removing organics and ions from liquid. Water to be purified is first exposed to ultraviolet(UV) radiation to oxidize organics in the liquid. The UV-treated water then is passed through an electrodeionization apparatus having an ion depletion compartment containing mixed anion and cation exchange resin beads and an ion concentration compartment in a given separation stage having an anode and a cathode. A second liquid is passed through the concentration compartment which is free of or filled with ion exchange resin beads. Ions under the influence of D.C. potential pass from the depletion compartments into the concentration compartments through ion permeable membranes. The electrodeionization apparatus can be operated continuously in conjunction with the UV radiation step since resin regeneration is not required.
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