Process for removing and sequestering contaminants from aqueous streams

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Contaminants, including arsenic, are removed from water and other aqueous feeds preferably by (1) treating the feed with a compound containing a rare earth (e.g., cerium in the +4 oxidation state, preferably cerium dioxide), to oxidize contaminants in the +3 oxidation state to arsenic in the +5 oxidation state and (2) removing the contaminants in the +5 oxidation state from the aqueous phase, normally by contacting the treated feed with a rare earth-containing precipitating agent.