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Process for Liquid Waste Treatment

#2762


Process Adaptation for Treatment of HLW and ILW by Extraction with Zirconium Salt of HDBP and its Testing Using Real Radwaste

Tech Area / Field

  • ENV-RWT/Radioactive Waste Treatment/Environment

Status
8 Project completed

Registration date
29.04.2003

Completion date
31.03.2009

Senior Project Manager
Genisaretskaya S V

Leading Institute
Khlopin Radium Institute, Russia, St Petersburg

Collaborators

  • Florida State University / Department of Chemistry and Biochemistry, USA, FL, Tallahassee\nAtomic Energy Canada Limited, Canada, ON, Chalk River

Project summary

The research work done in the framework of ISTC Project 1608, performed by V.G. Khlopin Radium Institute (St. Petersburg, Russia) resulted in development of the process for treatment of liquid radioactive wastes with the use of extraction system based on the zirconium salt of dibutyl phosphoric acid (ZS HDBP).

A principal difference of the process from the known analogous processes consists in usage of widely available and easily regenerable organic reagents, dibutyl phosphoric acid (HDBP) and tributyl phosphate (TBP). An important feature of the process consists in the fact that no secondary organic waste is produced, as the products of TBP and ZS HDBP degradation are soluble in aqueous solutions of ammonium carbonate. These solutions are thoroughly evaporated, and then the solvent degradation products are immobilized jointly with radionuclides.

The process shows great promise for solving problems of acidic wastes of various composition, including the stored radwastes in existence in Russia, USA and other countries. Therefore, it would be reasonable to continue the research as a new ISTC project, the aims of which should consist in:


- optimization of the technology and its adaptation to some types of liquid radwaste available in Russia, USA and other countries;
- demonstration of fitness of the process for treatment of real high-level and intermediate-level liquid radwastes of different composition to obtain solid products suitable for long-term storage or disposal.

The demonstrational testing of the process will be performed with the use of the stored aqueous radwaste collected in former years during experimental treatment of NPP spent nuclear fuel in Gatchina R&D pision of the Khlopin Radium Institute. information on specific process conditions for the wastes of different composition and on the properties of the immobilized products will be obtained.

The results to be obtained in course of the investigation and demonstrational experiments will enable to recommend the ZS HDBP-based technology for commercial-scale plant tests with the use of radwaste of radiochemical plants of Russia, USA and other countries, including some types of waste from former weapons activities.


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