Water treatment system and method
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.
Claims16
A method comprising:
- 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.
A method comprising:
- 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 and regenerate the ion exchange resin;
- adjusting the pH of the brine solution prior to converting the hexavalent chromium oxyanion to a trivalent chromium cation;
- delivering the brine solution into contact with a reducing agent to convert hexavalent chromium oxyanion to the trivalent chromium cation;
- delivering the brine solution into contact with a chelating resin to bind the trivalent chromium cation to the chelating resin;
- and
- removing the chelating resin with the trivalent chromium cation bound to the chelating resin.
Dependencies are inferred from the claim text.