Removal of selenium from aqueous media
AssigneeShell Oil Company
InventorsThomas C. Forschner, Peter A. Kilty, Thomas F. Brownscombe
Life of this patent
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Abstract
A process for the removal of soluble selenium from aqueous media comprising contacting the aqueous media with a porous support material having exchanged thereon metal ions selected from transition metal ions, alkali earth metal ions and mixtures thereof.
Claims21
A process for removing soluble selenium from an aqueous media which comprises contacting the aqueous media with a zeolite having incorporated therein metal ions selected from the group consisting of transition metal ions, alkaline earth metal ions, and mixtures thereof.
A process for removing soluble selenium from an aqueous media which comprises:
- a. contacting an aqueous media with a metal ion incorporated zeolite wherein the metal ions are selected from the group consisting of zinc, copper, iron, calcium, titanium, zirconium, chromium, molybdenum, tungsten, manganese, cobalt, mercury, nickel, barium and mixtures thereof;
- b. monitoring the efficiency of the selenium removal;
- c. stripping the selenium from the metal ion incorporated zeolite with an acid solution once the monitoring indicates the zeolite is loaded;
- d. regenerating the metal ion incorporated zeolite by flushing it with a metal ion solution;
- and
- e. contacting the regenerated metal ion incorporated zeolite with more selenium-containing media.
A process for removing soluble selenium from an aqueous media which comprises:
- a. contacting an aqueous media with a zinc ion incorporated faujasite having a silica to alumina ratio from about 1 to about 80;
- b. monitoring the efficiency of the selenium removal;
- c. stripping the selenide complex from the zinc ion incorporated faujasite with HCl once the monitoring indicates the zinc ion incorporated faujasite is loaded;
- d. regenerating the zinc ion incorporated faujasite by flushing it with a zinc ion solution;
- and
- e. contacting the zinc ion exchanged faujasite with more selenium-containing media.
Dependencies are inferred from the claim text.