Liquid purification or separation – Processes – Ion exchange or selective sorption
Patent
1991-02-22
1992-05-26
Silverman, Stanley S.
Liquid purification or separation
Processes
Ion exchange or selective sorption
210677, 210670, C02F 142
Patent
active
051165112
ABSTRACT:
A treatment system for removing metal ions from water and a method for cleaning the system. Contaminated water is passed through a plurality of columns having ion-extracting agents therein. When saturated with ions, each column is successively cleaned with primary and secondary acid solutions from separate vessels. When the primary acid is saturated with ions, it is membrane-filtered to remove ions therefrom. The secondary acid is then directed into the primary acid vessel, with the purified primary acid being routed back into the system (preferably into the second vessel) for reuse. The column is then rinsed with water, washed with an alkali solution (periodically concentrated using a water-permeable membrane), and rinsed again with water. The system preferably uses three columns, all of which are successively cleaned in the manner described above.
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Cochetas George S.
Green Dennis H.
Harrison Western Environmental Services, Inc.
Malkin Jay K.
Neisler Cynthia L.
Silverman Stanley S.
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