Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 46, Issue 16, Pages 8895-8902Publisher
AMER CHEMICAL SOC
DOI: 10.1021/es302016p
Keywords
-
Categories
Funding
- Subsurface Science Scientific Focus Area at Lawrence Berkeley National Laboratory
- U.S. Department of Energy, Office of Science, Office of Biological and Environmental Research [DE-AC02-05CH11231]
- U.S. Department of Energy, Office of Science, Subsurface Biogeochemical Research through the Integrated Field Research Challenge Site (IFRC) at Rifle, Colorado
Ask authors/readers for more resources
Stable isotope fractionations of sulfur are reported for three consecutive years of acetate-enabled uranium bioremediation at the US Department of Energy's Rifle Integrated Field Research Challenge (IFRC) site. The data show a previously undocumented decrease in the time between acetate addition and the onset of sulfate reducing conditions over subsequent amendments, from 20 days in the 2007 experiment to 4 days in the 2009 experiment. Increased sulfide concentrations were observed at the same time as delta S-34 of sulfate enrichment in the first year, but in subsequent years elevated sulfide was detected up to 15 days after increased delta S-34 of sulfate. A biogeochemical reactive transport model is developed which explicitly incorporates the stable isotopes of sulfur to simulate fractionation during the 2007 and 2008 amendments. A model based on an initially low, uniformly distributed population of sulfate reducing bacteria that grow and become spatially variable with time reproduces measured trends in solute concentration and delta S-34, capturing the change in onset of sulfate reduction in subsequent years. Our results demonstrate a previously unrecognized hysteretic effect in the spatial distribution of biomass growth during stimulated subsurface bioremediation.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available