Microbial Influence on the Mobility of +3 Actinides from a Salt-Based Nuclear Waste Repository

Swanson, Julie; Navarrette, Adrianne; Knox, Jandi; Kim, Hannah; Stanley, Floyd

doi:10.3390/microorganisms11061370

Microbial Influence on the Mobility of +3 Actinides from a Salt-Based Nuclear Waste Repository

Journal Article · Wed May 24 00:00:00 EDT 2023 · Microorganisms

DOI:https://doi.org/10.3390/microorganisms11061370· OSTI ID:2471778

Swanson, Julie ^[1]; Navarrette, Adrianne ^[1]; Knox, Jandi ^[1]; Kim, Hannah ^[1]; Stanley, Floyd ^[1]

Los Alamos National Laboratory (LANL), Carlsbad, NM (United States)

Biologically enhanced transport of radionuclides is one of several processes that can affect the performance of a nuclear waste repository. In this work, several microbial isolates from the Waste Isolation Pilot Plant (WIPP) were tested for their influence on the concentration of neodymium, as an analog for +3 actinides, in simple sodium chloride solutions and in anoxic WIPP brines. Batch sorption experiments were carried out over a period of 4–5 weeks. In many cases, the effect on neodymium in solution was immediate and extensive and assumed to be due to surface complexation. However, over time, the continued loss of Nd from the solution was more likely due to biologically induced precipitation and/or mineralization and possible entrapment in extracellular polymeric substances. The results showed no correlation between organism type and the extent of its influence on neodymium in solution. However, a correlation was observed between different test matrices (simple NaCl versus high-magnesium brine versus high-NaCl brine). Further experiments were conducted to test these matrix effects, and the results showed a significant effect of magnesium concentration on the ability of microorganisms to remove Nd from solution. Possible mechanisms include cation competition and the alteration of cell surface structures. This suggests that the aqueous chemistry of the WIPP environs could play a larger role in the final disposition of +3 actinides than the microbiology.

View Accepted Manuscript (DOE)

Research Organization:: Savannah River National Laboratory (SRNL), Aiken, SC (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: 89303321CEM000080

OSTI ID:: 2471778

Alternate ID(s):: OSTI ID: 2566445
OSTI ID: 2568872

Journal Information:: Microorganisms, Journal Name: Microorganisms Journal Issue: 6 Vol. 11; ISSN 2076-2607

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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