Solution decontamination method using precipitation techniques

Details Solution decontamination method using precipitation techniques Solution decontamination method using precipitation techniques

C - Chemistry, Metallurgy

02

F

C02F 1/52 (2006.01) B01D 21/01 (2006.01) C02F 1/66 (2006.01) G21F 9/10 (2006.01)

Patent

CA 2120423

ABSTRACT OF THE DISCLOSURE Solutions such as for example drinking water, ground water and extracting solutions contaminated with heavy metals and radioactive species, singly or in combination, are treated by first treating the contaminated solution with silicate and ammonium hydroxide solution precipitants. Then the contaminated solution is separately treated with an acid which gels, polymerizes and/or precipitates the contaminant- containing silica matrix to form an easily dewaterable and separable solid. The solid contaminants are readily removed from the cleansed solution by filtration means. The process utilizes a novel combination of steps which maximizes contaminant removal, minimizes waste volume, and produces a treatable waste solid. The preferred precipitants are sodium silicate, and ammonium hydroxide. The preferred mineral acid is hydrochloric acid.

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