Liquid purification or separation – Processes – Ion exchange or selective sorption
Patent
1988-11-15
1990-06-19
Stoll, Robert L.
Liquid purification or separation
Processes
Ion exchange or selective sorption
210685, 210688, 210702, 210906, 210907, 210912, 423 87, 423508, C02F 142
Patent
active
049351460
ABSTRACT:
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.
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Martin Edward S.
Novak John W.
O'Neill Gary A.
Aluminum Company of America
Bos Steven J.
Stoll Robert L.
Topolosky Gary P.
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