In situ remediation process using divalent metal cations

Brady, Patrick V.; Khandaker, Nadim R.; Krumhansl, James L.; Teter, David M.

Title: In situ remediation process using divalent metal cations

Patent · Tue Dec 14 00:00:00 EST 2004

OSTI ID:1175169

Brady, Patrick V.; Khandaker, Nadim R.; Krumhansl, James L.; Teter, David M.

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.sup.2+ or Zn.sup.2+, 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.sub.4 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.

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Research Organization:: Sandia National Lab. (SNL-CA), Livermore, CA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC04-94AL85000

Assignee:: Sandia Corporation

Patent Number(s):: 6,830,695

Application Number:: 10/356,148

OSTI ID:: 1175169

Country of Publication:: United States

Language:: English

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