Liquid purification or separation – Processes – Ion exchange or selective sorption
Patent
1991-07-02
1993-04-06
Hruskoci, Peter
Liquid purification or separation
Processes
Ion exchange or selective sorption
210688, 210694, 210695, 210719, 210721, 210724, 210726, 210737, 210912, 423 55, 423508, C02F 148, C02F 170
Patent
active
052000826
ABSTRACT:
A method and system for removing toxic substances such as selenium from industrial and agricultural drain water, and particularly refinery effluent liquor, achieves very high removal of the toxic substance economically, by a chemical reduction process. Preferably, the effluent liquor is first filtered, which ordinarily is effective to remove selenium suspended in the liquor. Next the liquor is heated, preferably to about 150.degree. F., and a reducing agent such as finely powdered iron is added to bring, for example, the selenium down from a +6 valence to +4 and lower valences. Sulfur is added to the slurry to greatly improve the effectiveness of the iron in reducing the liquor. The slurry is constantly agitated. After a reaction time which may be about 15 minutes, an oxidizing agent is added, with the temperature of the slurry then raised to at least about 180.degree., with continued agitation. This causes the selenium and/or toxic metals to form a separable precipitate, and the precipitate is separated from the remainder of the slurry. A high purity treated liquor is produced, and even higher purity can be achieved by putting this treated liquor through the process a second time.
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Olsen Orrie C.
Santina Peter F.
Freiburger Thomas M.
Hruskoci Peter
Santina Water Company
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