Liquid purification or separation – Processes – Using magnetic force
Patent
1989-01-31
1990-07-10
Hruskoci, Peter
Liquid purification or separation
Processes
Using magnetic force
210719, 210721, 210724, 210726, 210737, 210912, 423 55, 423508, C02F 148, C02F 170
Patent
active
049405497
ABSTRACT:
A method and system for removing toxic substances such as selenium and molybdenum from agricultural irrigation water achieves nearly 100% removal of the toxic substance economically, by a chemical reduction process. The process is particulary efficacious for removing naturally occurring selenium and molybdenum from irrigation water which has seeped through the ground and taken compounds of these metals into solution. Preferably, the drain tile water solution is first concentrated, to about 30% dissolved solids. This may be economically accomplished by on site evaporation in an open pond which is impermeable to seepage. Next the concentrated brine solution 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. Wettable sulfur is added to the slurry to greatly improve the effectiveness of the iron in reducing the solution. 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 molybdenum to form a separable precipitate, and the precipitate is separated from the remainder of the slurry. In a preferred embodiment the iron is recycled by processing it through a separator.
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Olsen Orrie C.
Santina Peter F.
Freiburger Thomas M.
Hruskoci Peter
Santina Water Company
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