Process for removing selenium from wastewater effluent
AssigneeChevron Research Company
InventorPaul J. Marcantonio
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Abstract
Disclosed is a process for removing selenium from wastewater effluent. The processd includes the steps of; (i) contacting a selenide containing wastewater and a strong-base anion exchange resin to absorb selenide on the resin; (ii) eluting the ion exchange resin with an eluant which is effective for stripping selenide therefrom; and (iii) recovering elemental selenium from the selenide containing eluate resulting from step (ii). Also disclosed is a process for regenerating the ion exchange resin by treatment of the resin with an acidic chlorate solution.
Claims33
A process for removing selenium from wastewater effluent comprising the steps of;
- (i) contacting a selenide containing wastewater and a strong-base anion exchange resin to adsorb selenide on the resin;
- (ii) eluting the ion exchange resin with an eluant which is effective for stripping selenide therefrom;
- and
- (iii) recovering elemental selenium from the selenide containing eluate resulting from step (ii).
A process for regenerating a stron-base anion exchange resin used to remove selenium from wastewater effluent comprising treating the resin with an acidic chlorate solution.
A process for removing selenium from petroleum refining wastewater comprising the steps of;
- (i) stripping sulfur from selenide containing sour water produced by petroleum refining;
- (ii) subjecting the stripped sour water to ion exchange treatment with a strong-base anion exchange resin to adsorb selenide on the resin;
- (iii) eluting the ion exchange resin with an eluant for stripping selenide therefrom, said eluant containing at least one of sodium chloride and sodium hydroxide;
- and
- (iv) recovering elemental selenium from the selenide containing eluate resulting from step (iii) using at least one of (a) acidification of the eluate and (b) oxygenation of the eluate.
A process for regenerating a strong-base anion exchange resin used to remove selenide from selenide containing sour water produced by petroleum refining wherein the resin is treated with an acidic chlorate solution.
Dependencies are inferred from the claim text.