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

Nimmons, Michael J.

Pacific Northwest National Laboratory (U.S.)

关键词: Uranium;    Columbia River;    Sediments;    Autunite;    Positioning;   

DOI  :  10.2172/982309
RP-ID  :  PNNL-19461
RP-ID  :  AC05-76RL01830
RP-ID  :  982309

美国|英语

来源: UNT Digital Library

【 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.