Water treatment system for removing hexavalent chromium
AssigneeU.S. Water Services, Inc.
InventorMichael D. Kelly
Life of this patent
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Abstract
A method for removing chromium from a water source can include delivering source water having a hexavalent chromium oxyanion into contact with an ion exchange resin to exchange the hexavalent chromium oxyanion for an anion and convert the source water to treated water, discharging the treated water, rinsing the ion exchange resin with a brine solution to remove the hexavalent chromium oxyanion from the ion exchange resin, converting the hexavalent chromium oxyanion to a trivalent chromium cation, binding the trivalent chromium cation to a chelating resin, and removing the trivalent chromium cation bound to the chelating resin.
Claims11
A system comprising:
- a first vessel containing an ion exchange resin, the first vessel configured to receive source water and exchange an hexavalent chromium oxyanion for an anion and convert the source water to treated water, and configured to receive a brine solution to remove the hexavalent chromium oxyanion from the ion exchange resin;
- a second vessel for receiving the brine solution with the hexavalent chromium oxyanion from the first vessel;
- a third vessel containing a reducing agent for converting the hexavalent chromium oxyanion in the brine solution to a trivalent chromium cation;
- and
- a fourth vessel containing a chelating resin for binding the trivalent chromium cation in the brine solution, the fourth vessel configured to discharge the trivalent chromium cation bound to the chelating resin.
Dependencies are inferred from the claim text.