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Arsenic removal in conjunction with lime softening

United States Patent

6,802,980
October 12, 2004
View the Complete Patent at the US Patent & Trademark Office
Sandia National Laboratories - Visit the Intellectual Property Management and Licensing Website
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.
Khandaker; Nadim R. (Albuquerque, NM), Brady; Patrick V. (Albuquerque, NM), Teter; David M. (Edgewood, NM), Krumhansl; James L. (Albuquerque, NM)
Sandia Corporation (Albuquerque, NM)
10/ 231,967
August 30, 2002
GOVERNMENT RIGHTS The Government has rights to this invention pursuant to Contract No. DE-AC04-94AL85000 awarded by the U.S. Department of Energy.