Compositions and methods for selenium removal
AssigneeChemtreat, Inc.
InventorsWilliam H. HENDERSON, John Philip RICHARDSON, Vladimir DJUKANOVIC
Life of this patent
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Abstract
Methods for removing a target selenium entity from fluids by treating the fluid with a rare earth impregnated media containing an immobilized rare earth. The methods including obtaining a contaminated fluid comprising water and dissolved selenate; contacting the feed fluid with a rare earth impregnated media for removal of at least a portion of the selenate from the feed fluid thereby forming a treated fluid comprising less selenium than the feed fluid.
Claims20
A method for removing selenium from an aqueous fluid, comprising:
- obtaining a feed fluid comprising water and dissolved selenate;
- contacting the feed fluid with a rare earth impregnated media comprising a resin to remove at least a portion of the selenate from the feed fluid thereby forming a treated fluid with less selenium than the feed fluid, wherein
- at least about 20 ppb of the dissolved selenate is present in the feed fluid, and
- the amount of selenium in the treated fluid is less than 12 ppb.
A method comprising contacting a feed fluid comprising water and dissolved selenate with a rare earth impregnated media to remove at least a portion of the selenate from the feed fluid thereby forming a treated fluid with less selenium than the feed fluid wherein
- the rare earth impregnated media comprises cerium and a resin,
- at least about 100 ppb of the dissolved selenate is present in the feed fluid,
- the feed fluid is contacted with a sufficient quantity ofthe rare earth impregnated media such that the rare earth impregnated media affixes the selenate to such an extent that 90 wt. % or more of the selenium, on an elemental selenium basis, is removed from the feed fluid.
A method for removing selenium from an aqueous fluid, comprising:
- obtaining a contaminated fluid comprising water and dissolved selenate and dissolved selenite;
- converting at least some of the selenite of the contaminated fluid into selenate to form a feed fluid;
- contacting the feed fluid with a rare earth impregnated media to remove at least a portion of the selenate from the feed fluid thereby forming a treated fluid with less selenium than the feed fluid;
- wherein
- the rare earth impregnated media comprises a resin,
- at least about 100 ppb of the dissolved selenate is present in the feed fluid,
- the feed fluid is contacted with a sufficient quantity of the rare earth impregnated media such that the rare earth impregnated media affixes the selenate to such an extent that 90 wt. % or more of the selenium, on an elemental selenium basis, is removed from the feed fluid.
Dependencies are inferred from the claim text.