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US 7,465,400 B2Granted
System for biodegradation of oxyanions such as perchlorate on ion exchange resins
AssigneeBasin Water, Inc.
InventorByung-Uk Bae
Life of this patent
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Abstract
Systems and methods for removing perchlorate load off of ion exchange resins are disclosed. The systems and methods rely upon direct contact between the resin and a liquid product formed by the culturing of perchlorate-destroying microorganisms. These methods can be incorporated into methods for removing perchlorate from aqueous streams. A resin product comprising an anion exchange resin with a coating of perchlorate-destroying microorganisms on its surface is also disclosed.
Claims26
A system for reducing the perchlorate load on a perchlorate-loaded anion exchange resin and producing a reduced perchlorate load anion exchange resin comprising:
- a source of perchlorate-destroying microorganism fluid product,
- a resin contact reaction zone containing perchlorate-loaded anion exchange resin and in which the perchlorate-loaded anion exchange resin is directly contacted with the perchlorate-destroying microorganism fluid product provided by the source at conditions under which the perchlorate-destroying microorganism fluid product reacts with the perchlorate load present on the perchlorate-loaded anion exchange resin converting perchlorate to nonperchlorate reaction products thereby producing a reduced perchlorate load anion exchange resin, and
- a separator for separating the reduced perchlorate load anion exchange resin from the perchlorate-destroying microorganism fluid product.
A system for reducing the perchlorate content of perchlorate-contaminated water comprising:
- a source of perchlorate-contaminated water,
- a reaction zone containing an anion exchange resin having an affinity for perchlorate present in the perchlorate-contaminated water,
- a fluid feeder for feeding the perchlorate-contaminated water to the reaction zone into contact with the anion exchange resin under conditions permitting the resin to remove perchlorate from the perchlorate-contaminated water thereby forming a reduced perchlorate content product water and perchlorate-loaded anion exchange resin,
- a separator for separating the reduced perchlorate content product water from the perchlorate-loaded anion exchange resin,
- a source of perchlorate-destroying microorganism fluid product,
- a contactor for directly contacting the perchlorate-loaded anion exchange resin formed in the reaction zone with the perchlorate-destroying microorganism fluid product at conditions under which the perchlorate-destroying microorganism fluid product reacts with the perchlorate-load present on the perchlorate-loaded anion exchange resin converting perchlorate to non perchlorate reaction products thereby producing a reduced perchlorate-load anion exchange resin, and
- a separator for separating recovering the reduced perchlorate load anion exchange resin from the perchlorate-destroying fluid reaction product.
4 more elements
A system for reducing the perchlorate content of perchlorate-contaminated water that additionally contains at least one of nitrate and sulfate comprising
- a source of nitrate and/or sulfate-containing, perchlorate-contaminated water,
- a first reaction zone containing a first anion exchange resin having an affinity for perchlorate and nitrate and/or sulfate present in the perchlorate-contaminated water, a fluid feeder for feeding said nitrate and/or sulfate-containing perchlorate-contaminated water to the first reaction zone into contact with the first anion exchange resin under conditions permitting the resin to remove perchlorate and nitrate and/or sulfate from the perchlorate-contaminated water thereby forming a reduced perchlorate, nitrate and sulfate-content product water and perchlorate, nitrate and sulfate-loaded first anion exchange resin,
- a separator for separating the reduced perchlorate, nitrate and sulfate-content product water from the perchlorate, nitrate and sulfate-loaded first anion exchange resin,
- a salt brine source providing a salt brine in contact with the separated perchlorate, nitrate and sulfate-loaded first anion exchange resin under nitrate, sulfate, and perchlorate displacing conditions thereby forming a nitrate, sulfate and perchlorate-loaded spent brine, and a reduced nitrate, sulfate and perchlorate-content regenerated first anion exchange resin,
- a separator for separating the nitrate, sulfate and perchlorate-loaded spent brine from the regenerated first anion exchange resin,
- a second reaction zone containing a second anion exchange resin having enhanced affinity for perchlorate over nitrate and sulfate, a fluid feeder for feeding the nitrate, sulfate and perchlorate-loaded spent brine to the second reaction zone into contact with the second anion exchange resin under conditions permitting the resin to preferentially remove perchlorate from the nitrate, sulfate and perchlorate-loaded spent brine thereby forming a reduced perchlorate content spent brine and perchlorate-loaded second anion exchange resin,
- a separator for separating the reduced perchlorate-loaded spent brine from the perchlorate-loaded second anion exchange resin,
- a source of perchlorate-destroying microorganism fluid product,
- a contactor for directly contacting the perchlorate-loaded second anion exchange resin formed in the second reaction zone with the perchlorate-destroying microorganism fluid product at conditions under which the perchlorate-destroying microorganism fluid product reacts with the perchlorate-load present on the perchlorate-loaded second anion exchange resin converting perchlorate to nonperchlorate reaction products thereby producing a reduced perchlorate-load second anion exchange resin, and
- a separator for separating recovering the reduced perchlorate load second anion exchange resin from the perchlorate-destroying fluid reaction product.
7 more elements
Dependencies are inferred from the claim text.