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              <p>Manipulating  the  subsurface  redox  status  of  uranium  has been  proposed  as  an in-situ  bioremediation  strategy.  Recent evidence  suggests  that  biologically  driven  redox  reactions  in organic-rich   sediments   play   major   roles   in   maintaining uranium  groundwater  plumes  in  the  upper  Colorado  River basin  (U.S.A.).  The  speciation  of  uranium  in  these systems  is poorly  constrained  but  critical  to  predicting  uranium  fate  and transport.   Moreover,   it   is   necessary   to   understand   how biogeochemical  cycles  of  other  elements,  including  C,  N,  Fe, and S couple to those of uranium.The   SLAC   SFA   program   has   investigated   reduced uranium,  carbon,  sulfur,  and  iron  species at  molecular  to  pore scales in-situ  in  the  biostimulated  aquifer  and  in  sediments from  organic-rich  naturally-reduced  zones  (NRZs)at  the  U.S. Department  of  Enery’s  Rifle,  CO  field  site.The  purposes of this  work  are  to  constrain  uranium  speciation,  understand  the coupling of C, N, Fe, S and U redox cycles, and to characterize biogeochemical     interactions     between     NRZs     and     the surrounding aquifer.This   talk   will   compare   and   contrast   artificially   and naturally  bioreduced  sediment  systems.  The  rate  and  extent  of uranium   reduction   appears   to   be   closely   tied   to   sulfur reduction.  A  coupled  biological-abiotic  process  model  will  be discussed   to   account   for   the   relative   abundance   of   non-crystalline  forms  of  U(IV)  in  both  systems.It  will  be  shown that  aquifer-NRZ  interfaces  are  biogeochemical  hot  spots  that likely facilitate uranium resupply to aquifers.</p>
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