Method for removing toxic metals from agricultural drain water

Details Method for removing toxic metals from agricultural drain water Method for removing toxic metals from agricultural drain water

C - Chemistry, Metallurgy

02

F

53/146, 362/56,

C02F 1/58 (2006.01) C02F 1/48 (2006.01) C02F 1/70 (2006.01) C02F 1/72 (2006.01) C02F 9/00 (2006.01)

Patent

CA 2007800

201P Abstract of the Disclosure 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 particularly 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° 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°, 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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