FINAL REPORT: Coupling Sorption to Soil Weathering During Reactive Transport: Impacts of Mineral Transformation and Sorbent Aging on Contaminant Speciation and Mobility

Mueller, Karl T ; Chorover, John C ; ODay, Peggy A ; Um, Wooyong ; Steefel, Carl I

关键词: STRONTIUM;    IODINE;    SOILS;    MINERALS Reactive Transport;    Cesuim;    Strontium;    Iodine;    Vadose Zone;    Soil;    Minerals;    Feldspathoids;   

DOI  :  10.2172/966955
RP-ID  :  DOE/ER/64191-1
PID  :  OSTI ID: 966955

美国|英语

来源: SciTech Connect

【 摘 要 】

This project aimed for a predictive-mechanistic understanding of the coupling between mineral weathering and contaminant (Cs, Sr, I) transport/fate in caustic waste-impacted sediments. Based on our prior studies of model clay mineral systems, we postulated that contaminant uptake to Hanford sediments would reflect concurrent adsorption and co-precipitation effects. Our specific objectives were: (1) to assess the molecular-scale mechanisms responsible for time-dependent sequestration of contaminants (Cs, Sr and I) during penetration of waste-induced weathering fronts; (2) to determine the rate and extent of contaminant release from the sorbed state; (3) to develop a reactive transport model based on molecular mechanisms and macroscopic flow experiments [(1) and (2)] that simulates adsorption, aging, and desorption dynamics. Progress toward achieving each of these objectives is discussed in this Final Report.