Biodegradation of oxyanions such as perchlorate on ion exchange resins
AssigneeBasin Water, Inc.
InventorJacimaria R. Batista
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Abstract
Improved systems and methods for removing the load of perchlorate and other oxyanions off of ion exchange resins through bioregeneration are disclosed. The improved systems and methods rely upon direct contact between the resin and a liquid product containing enrichment cultures of or pure strains of perchlorate-destroying microorganisms. Controlled temperatures also lead to improvements as do upflow conditions leading to bed expansion. These methods can be incorporated into methods for removing perchlorate from aqueous streams.
Claims25
In a method for reducing the level of perchlorate load on perchlorate-loaded ion exchange resin comprising the steps of:
- a. obtaining a perchlorate-loaded ion exchange resin, and
- b. directly contacting the perchlorate-loaded ion exchange resin with a perchlorate-destroying microbial fluid product under conditions leading to conversion of perchlorate load on the resin to nonperchlorate reaction products and generation of treated ion exchange resin having reduced perchlorate load relative to the perchlorate-loaded ion exchange resin;
- the improvement comprising employing in step b. a perchlorate-destroying microbial fluid product which is based upon an enrichment culture, a pure microbial culture or an enzymatic extract of an enrichment culture or of a pure culture.
In a method for reducing the level of perchlorate load on perchlorate-loaded ion exchange resin comprising the steps of:
- a. obtaining perchlorate-loaded ion exchange resin, and
- b. directly contacting the perchlorate-loaded ion exchange resin with a perchlorate-destroying microbial fluid product under conditions leading to conversion of perchlorate load on the resin to nonperchlorate reaction products and generation of treated ion exchange resin having reduced perchlorate load relative to the perchlorate-loaded ion exchange resin;
- the improvement comprising conducting the contacting of step b. at controlled temperature in the range of from about 5° C. to about 30° C.
In a method for reducing the level of perchlorate load on perchlorate-loaded ion exchange resin comprising the steps of:
- a. obtaining perchlorate-loaded ion exchange resin, and
- b. directly contacting the perchlorate-loaded ion exchange resin with a perchlorate-destroying microbial fluid product under conditions leading to conversion of perchlorate on the resin to nonperchlorate reaction products and generation of treated ion exchange resin having reduced perchlorate load relative to the perchlorate-loaded ion exchange resin;
- the improvement comprising conducting the contacting of step b. under conditions including the resin being in a bed contained in a vessel with the fluid product flowing upflow through the bed of resin.
In a method for removing perchlorate contamination from a perchlorate-containing feed water comprising the steps of:
- a. contacting the perchlorate-containing feed water with anion exchange resin having affinity for perchlorate thereby removing perchlorate from the feed water and forming a reduced-perchlorate-content product water and perchlorate-loaded ion exchange resin,
- b. separating the reduced-perchlorate-content product water from the perchlorate-loaded ion exchange resin,
- c. directly contacting the perchlorate-loaded ion exchange resin with a perchlorate-destroying microbial fluid product under conditions leading to conversion of perchlorate load on the resin to nonperchlorate reaction products and generation of treated ion exchange resin having reduced perchlorate load relative to the perchlorate-loaded ion exchange resin;
- the improvement comprising one or more of
- i. employing in step c. a perchlorate-destroying microbial fluid product which is based upon an enrichment culture, a pure microbial culture or an enzymatic extract of an enrichment culture or of a pure culture wherein the culture comprises a material selected from the group consisting of
- α, β, and γ subclasses of proteobacteria;
- Dechloromonas agitata;
- Dechloromonas SUIL;
- Dechloromonas Miss;
- Dechloromonas NM;
- Dechloromonas JM;
- Dechloromonas HZ;
- Dechloromonas JDS5;
- Dichlorosoma suillum;
- Dichlorosoma PS;
- Dichlorosoma SDGM;
- Dichlorosoma KJ;
- Dichlorosoma GR-I;
- Dichlorosoma PDX;
- Dichlorosoma perc lace;
- Dichlorosoma DPA;
- Dichlorosoma D8;
- Dichlorosoma KJ;
- Dichlorosoma KJ4;
- Pseudomonas stenotrophomonas;
- Vibrio dechloraticans Cuznesove B-1168;
- Wohinella succinogenes HAP-1;
- Ideonella dechloratans;
- and
- Acinetobacter thermotoleranticus,
- ii. conducting the contacting of step c. at controlled temperature in the range of from about 5° C. to about 30° C., and
- iii. conducting the contacting of step b under conditions including the resin being in a bed contained in a vessel with the fluid product flowing upflow through the bed of resin such as to provide expansion of the bed of resin.
Dependencies are inferred from the claim text.