Method of treating chelating agent solution containing radioacti

Details Method of treating chelating agent solution containing radioacti Method of treating chelating agent solution containing radioacti

1996-12-13

1998-11-03

Mai, Ngoclan

Hazardous or toxic waste destruction or containment

Destruction or containment of radioactive waste

Treating radioactive liquid

588 18, 210682, 210765, 205750, 205752, 205771, 376313, 976DIG376, G21F 900

Patent

active

058323937

ABSTRACT:
Although a chelating agent solution having radioactive contaminants is solidified by mixing with cement and then stored, a vast storage place is required for storing an enormous amount of chelating agent solution. When such a chelating agent solution is treated with an ion-exchange resin, a large amount of ion-exchange resin is required, and a large amount of ion-exchange resin having radioactive contaminants is produced. The present invention thus provides a method of treating a chelating agent solution having radioactive contaminants, which can significantly decrease the amount of the chelating agent solution having radioactive contaminants, and which, when an ion-exchange resin is used, can significantly decrease the load on the ion-exchange resin without producing a large amount of ion-exchange resin having radioactive contaminants. In this method, a chelating agent solution having radioactive contaminants is electrolyzed by a direct current to produce various gases and eliminate the chelating property, a holding agent such as a coagulant-precipitant or a metal scavenger, which holds metal ions to form a water-insoluble substance, is then added to the chelating agent solution to form an insoluble substance which is then filtered off, and the filtrate is treated with an ion-exchange resin. The produced purified water may be collected, or a chelating agent may be added to the purified water to form a chelating agent solution used for decontaminating a radioactive contaminated substance.

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