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

United States Patent

November 21, 2006
View the Complete Patent at the US Patent & Trademark Office
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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).
Teter; David M. (Edgewood, NM), Brady; Patrick V. (Albuquerque, NM), Krumhansl; James L. (Albuquerque, NM), Khandaker; Nadim R. (Albuquerque, NM)
Sandia Corporation (Albuquerque, NM)
11/ 351,365
February 10, 2006
GOVERNMENT RIGHTS The Government has rights to this invention pursuant to Contract No. DE-AC04-94AL85000 awarded by the U.S. Department of Energy.