Sandia Corporation

David M Teter

Patrick V Brady

James L Krumhansl

Nadim R Khandaker

Paul McConnell

A method (and concomitant kit) for treating a surface to reduce subsequentCs nuclide desorption comprising contacting the surface with a first cation-containing solution, the cation being one or more of Cs, Rb, Ag, Tl, K, and NH, and contacting the surface with a second cation-containing solution, the cation being one or more of Cs, Rb, Ag, Tl, K, and NH, thereby reducing amounts of radioactive cesium embedded in clays found on the surface.

Cask weeping mitigation

A process and medium for decontamination of water containing anionic species including arsenic and chromium, wherein compounds comprising divalent and trivalent metal oxides and sulfides are used to form surface complexes with contaminants under pH conditions within the range of potable water. In one embodiment natural and synthetic spinels and spinel-like materials are used as the sorbent substance.

Inorganic ion sorbent method

An improved water decontamination process comprising contacting water containing anionic contaminants with an enhanced coagulant to form an enhanced floc, which more efficiently binds anionic species (e.g., arsenate, arsenite, chromate, fluoride, selenate, and borate, and combinations thereof) predominantly through the formation of surface complexes. The enhanced coagulant comprises a trivalent metal cation coagulant (e.g., ferric chloride or aluminum sulfate) mixed with a divalent metal cation modifier (e.g., copper sulfate or zinc sulfate).

Method of removing arsenic and other anionic contaminants from contaminated water using enhanced coagulation

Inorganic ion sorbents

Inorganic ion sorbents and methods for using the same

An in situ process for treating ambient solid materials (e.g., soils, aquifer solids, sludges) by adding one or more divalent metal cations to the ambient solid material. The added divalent metal cations, such as Cu or Zn , combine with metal oxide/hydroxides (e.g., ferric oxide/hydroxide or aluminum oxide/hydroxide) already present in the ambient solid material to form an effective sorbent material having a large number of positively-charged surface complexes that binds and immobilizes anionic contaminant species (e.g., arsenic or chromate). Divalent metal cations can be added, for example, by injecting an aqueous solution of CuSO into an aquifer contaminated with arsenic or chromate. Also, sludges can be stabilized against leaching of anionic contaminants through the addition of divalent metal cations. Also, an inexpensive sorbent material can be easily formed by mixing divalent metal cations with soil that has been removed from the ground.

In situ remediation process using divalent metal cations

A method for removing dissolved arsenic from an aqueous medium comprising adding lime to the aqueous medium, and adding one or more sources of divalent metal ions other than calcium and magnesium to the aqueous medium, whereby dissolved arsenic in the aqueous medium is reduced to a lower level than possible if only the step of adding lime were performed. Also a composition of matter for removing dissolved arsenic from an aqueous medium comprising lime and one or more sources of divalent copper and/or zinc metal ions.

Growing community of inventors

Edgewood, NM, United States of America

David M Teter