Solution decontamination method using precipitation techniques

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

1993-04-02

1994-12-06

Walsh, Donald P.

Hazardous or toxic waste destruction or containment

Destruction or containment of radioactive waste

Chemical conversion to a stable solid for disposal

423 11, 210682, 210688, G21F 908

Patent

active

053708270

ABSTRACT:
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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Larry W. Canter and Robert C. Knox, Ground Water Pollution Control (Lewis Publishers, Inc., 1985), pp. 110-120.

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