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Managing Solid Residues from a Treatment Process for Priority Metals
Author: Douglas T. Merrill, Mary E. McLearn
Date:
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Iron adsorption/coprecipitation is an economical process that, under the appropriate conditions, can remove dissolved and particulate priority metals to the extremely low concentrations now being required by regulatory agencies.1,2,3,4 Treatment involves adding an iron salt such as ferric chloride to the water, unless the water contains sufficient dissolved iron already. An amorphous iron oxyhydroxide precipitate then forms, as shown in Equation 1.

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