Wei-Min Wu, Jack Carley, Jian Luo, Matthew A Ginder-Vogel, Erick Cardenas, Mary Beth Leigh, Chiachi Hwang, Shelly D Kelly, Chuanmin Ruan, Liyou Wu, Joy Van Nostrand, Terry Gentry, Kenneth Lowe, Tonia Mehlhorn, Sue Carroll, Wensui Luo, Matthew W Fields, Baohua Gu, David Watson, Kenneth M Kemner, Terence Marsh, James Tiedje, Jizhong Zhou, Scott Fendorf, Peter K Kitanidis, Philip M Jardine, Craig S Criddle
Groundwater within Area 3 of the U.S. Department of Energy (DOE) Environmental Remediation Sciences Program (ERSP) Field Research Center at Oak Ridge, TN (ORFRC) contains up to 135 microM uranium as U(VI). Through a series of experiments at a pilot scale test facility, we explored the lower limits of groundwater U(VI) that can be achieved by in-situ biostimulation and the effects of dissolved oxygen on immobilized uranium. Weekly 2 day additions of ethanol over a 2-year period stimulated growth of denitrifying, Fe(III)-reducing, and sulfate-reducing bacteria, and immobilization of uranium as U(IV), with dissolved uranium concentrations decreasing to low levels...
August 15, 2007: Environmental Science & Technology