Composition for removing arsenic from aqueous streams
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United States of America Patent
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Mar 30, 2010
Grant Date -
Apr 24, 2008
app pub date -
Oct 26, 2007
filing date -
Jan 29, 2003
priority date (Note) -
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Abstract
Arsenic is removed from water and other aqueous feeds by (1) treating the feed with a compound containing cerium in the +4 oxidation state, preferably cerium dioxide, to oxidize arsenic in the +3 oxidation state to arsenic in the +5 oxidation state and (2) removing the arsenic in the +5 oxidation state from the aqueous phase, normally by contacting the treated feed with alumina or other precipitating agent containing cations in the +3 oxidation state.
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