Removing heavy metal ions from water
AssigneeThe United States of America as represented by the Secretary of Agriculture
InventorsJohn M. Randall, Earl Hautala, Anthony C. Waiss, Jr., Judith A. Kuhnle
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Abstract
Heavy metal ions are removed from water by contact with formaldehyde-modified nut waste or tree bark.
Claims4
A method for removing dissolved heavy metal ions from water containing the same, which comprises contacting said water with a formaldehyde-modified nut waste, said nut waste being selected from the group consisting of nut hulls, skins, woody shells, expeller meals, and pellicles.
A method for removing dissolved heavy metal ions from water containing the same, which comprises contacting said water with formaldehyde-modified nut waste, said nut waste being selected from the group consisting of nut hulls, skins, woody shells, expeller meals, and pellicles, and being modified by reaction with 15-20% formaldehyde, based on the weight of nut waste, at 50.degree.-70.degree. C. for 2-3 hours under acidic conditions.
Dependencies are inferred from the claim text.