Recovery of EDTA from steam generator cleaning solutions

Details Recovery of EDTA from steam generator cleaning solutions Recovery of EDTA from steam generator cleaning solutions

1991-05-10

1993-07-06

Hruskoci, Peter

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210724, 210726, 210737, 210912, 134 10, 134 13, 423 2, 423 11, 252631, C02F 162

Patent

active

052250873

ABSTRACT:
A process for recovering the chelating or complexing agents, particularly ethylenediaminetetraacetic (EDTA), used in chemical cleaning and decontamination operations performed to clean steam generators, especially nuclear powered steam generators, is provided. The EDTA, metal and radionuclide-containing aqueous waste stream is, optionally, first treated to remove the metals and radionuclides. The pH of the resulting liquor is then adjusted to less than 2.0, causing the precipitation of acid EDTA. The solid acid EDTA is recovered for reuse or disposal, as desired. The remaining liquid is treated as required to permit environmental disposal. Removal of the metals and radionuclides can be by sulfide precipitation or ion exchange and may be conducted before or after precipitation of the acid EDTA.

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EPRI NP-6356-M, Final Report, "Qualification of PWR Steam Generator Chemical Cleaning for Indian Point-2", May 1989.

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