Evaluation of Reagent Emplacement Techniques for Phosphate-based Treatment of the Uranium Contamination Source in the 300 Area White Paper

Nimmons, Michael J.

关键词: AUTUNITE;    COLUMBIA RIVER;    CONTAMINATION;    EVALUATION;    FLUCTUATIONS;    PHOSPHATES;    POSITIONING;    SEDIMENTS;    URANIUM;    URANIUM DEPOSITS;    URANIUM PHOSPHATES;   

DOI  :  10.2172/982309
RP-ID  :  PNNL-19461
PID  :  OSTI ID: 982309
Others  :  Other: 830403000
Others  :  TRN: US1004381

学科分类：核能源与工程

美国|英语

来源: SciTech Connect

【 摘 要 】

Persistent uranium contamination of groundwater under the 300 Area of the Hanford Site has been observed. The source of the uranium contamination resides in uranium deposits on sediments at the groundwater interface, and the contamination is mobilized when periodically wetted by fluctuations of Columbia River levels. Treatability work is ongoing to develop and apply phosphate-containing reagents to promote the formation of stable and insoluble uranium phosphate minerals (i.e., autunite) and other phosphate precipitates (di-calcium phosphate, apatite) to stabilize the uranium source. Technologies for applying phosphate-containing reagents by vertical percolation and lateral injection into sediments of the periodically wetted groundwater interface are being investigated. This report is a preliminary evaluation of technologies for lateral injection.