Hg removal from wastewater by regenerative adsorption
AssigneeMobil Oil Corporation
InventorTsoung Y. Yan
Life of this patent
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Abstract
In a method for removing mercury from a wastestream to produce an environmentally acceptable discharge, the wastestream is contacted with an effective amount of an adsorbent composition which includes a metal compound capable of forming an amalgam and/or a sulfide with mercury and a support. After contact, the treated wastewater is discharged amd the adsorbent composition is regenerated. A method for making the adsorbents is also provided.
Claims28
A method for removing mercury from an aqueous wastestream to produce an environmentally acceptable discharge, the method comprising contacting the wastestream with an effective of an adsorbent composition having a particle size of from about 2 to about 200 mesh, said adsorbent composition comprising a metal compound which forms an amalgam and/or a sulfide with mercury, said metal compound selected from a group consisting of bismuth, copper, iron, gold, silver, tin, zinc and palladium in the form of metals, oxides and sulfides and a support, discharging the treated wastestream and regenerating the adsorbent composition.
A method for removing mercury from an aqueous wastestream comprising:
- providing an adsorber vessel containing an adsorbent composition, the composition comprising a metal compound selected from a group consisting of bismuth, copper, iron, gold, silver, tin, zinc and palladium in the form of metals, oxides and sulfides and a support which comprises active carbon,
- introducing the wastestream into the adsorber vessel and into contact with the adsorbent composition therein at a temperature of from about 50.degree. F. to about 570.degree. F., a LHSV of from about 0.1 to about 100 and a pressure of from about zero to about 1000 psi,
- removing the contacted wastestream from the adsorber vessel,
- discharging the contacted wastestream,
- introducing a hot gas stream into the adsorber vessel and into contact with wastestream-contacted adsorber composition thereby regenerating the adsorber composition and producing a mercury-laden regeneration stream,
- removing the mercury-laden regeneration stream from the adsorber vessel.
Dependencies are inferred from the claim text.