Technetium Removal Using Tc-Goethite Coprecipitation

Um, Wooyong ; Wang, Guohui ; Jung, Hun Bok ; Peterson, Reid A.

关键词: Technetium;    goethite;    treatment and immobilization processes;    storage tanks;   

DOI  :  10.2172/1110480
RP-ID  :  PNNL-22967
RP-ID  :  EMSP-RPT-017
PID  :  OSTI ID: 1110480
Others  :  Other: 830403000

美国|英语

来源: SciTech Connect

【 摘 要 】

This report describes the results from laboratory tests performed at Pacific Northwest National Laboratory for the U.S. Department of Energy (DOE) EM-31 Support Program (EMSP) subtask, ???Low temperature waste forms coupled with technetium removal using an alternative immobilization process such as Fe(II) treated-goethite precipitation??? to increase our understanding of 99Tc long-term stability in goethite mineral form and the process that controls the 99Tc(VII) reduction and removal by the final Fe (oxy)hydroxide forms. The overall objectives of this task were to 1) evaluate the transformation process of Fe (oxy)hydroxide solids to the more crystalline goethite (??-FeOOH) mineral for 99Tc removal and 2) determine the mechanism that limits 99Tc(IV) reoxidation in Fe(II)-treated 99Tc-goethite mineral and 3) evaluate whether there is a long-term 99Tcoxidation state change for Tc sequestered in the iron solids.