Reduction and Reoxidation of Soils During and After Uranium Bioremediation; Implications for Long Term Uraninite Stability and Bioremediation Scheme Implementation

Peter R Jaffe Satish Myneni

关键词: BIOMASS;    BIOREMEDIATION;    IMPLEMENTATION;    IRON;    NITRATES;    OXIDATION;    OXYGEN;    SOILS;    STABILITY;    SULFATES;    URANINITES;    URANIUM uranium;    reoxidation;    oxygen;    nitrate;    biostimulation;   

DOI  :  10.2172/963722
RP-ID  :  ER63973-1025340-0011052
PID  :  OSTI ID: 963722
Others  :  TRN: US1001787

美国|英语

来源: SciTech Connect

【 摘 要 】

The goal of this research was to study the reoxidation of biologically precipitated U(IV). Several experiments were performed and are summarized below. These experiments include: (1) a long-term (~200 days) U(VI) reduction experiment under low sulfate conditions in order to study in detail changes in iron phases and biomass and determine how they affect/buffer reoxidation; (2) a short term (~70 days) experiment where we tracked the uranium profile via XANES prior to reoxidation and during reoxidation in order to determine the U speciation; (3) a short term experiment where we compare the oxidation of U(IV) by oxygen and nitrate in the absence of FeS; and (4) a short term experiment where we compare the oxidation of U(IV) by oxygen and nitrate in the presence of FeS precipitates.