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AssigneeAluminum Company of America
InventorsGary A. O'Neill, John W. Novak, Edward S. Martin
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A method is disclosed for reducing the amount of a first contaminant and second contaminant in a solution to environmentally safe levels, said solution having a substantially greater amount of the first contaminant than the second contaminant. The method comprises: contacting the solution with an activated or calcined product of a compound having the formula A.sub.6 B.sub.2 (OH).sub.16 C.4H.sub.2 O, wherein A is a divalent metal cation, B is a trivalent metal cation and C is a mono- to tetravalent anion. The method further comprises separating the solution from the contacted product. The method is particularly useful for removing both selenium and sulfate, arsenic and sulfate, or arsenic and phosphate from a waste water stream. An unpredicted preference for selenium and arsenic, in the presence of other contaminants including sulfate and phosphate, was also shown herein.
A method for reducing the amount of first contaminant and second contaminant in a solution, said first contaminant selected from phosphate, sulfate and mixtures thereof, said second contaminant selected from arsenic, selenium and mixtures thereof, said solution having a greater amount of the first contaminant than the second contaminant and said method selectively reducing the level of second contaminant in solution to below about 0.01 ppm, said method comprising:
A method for treating a solution containing a first contaminant selected from phosphate, sulfate, chloride and fluroide, and a second contaminant selected from arsenic and selenium, said method comprising:
A method for selectively adsorbing arsenic or selenate from an aqueous solution containing one or more contaminants selected from:
A method for removing both selenium and sulfate contaminants from a waste water stream, said method comprising:
A method for removing both arsenic and sulfate contaminants from a waste water stream, said method comprising:
A method for removing both arsenic and phosphate contaminants from a waste water stream, said method comprising:
Dependencies are inferred from the claim text.