In Situ Long-Term Reductive Bioimmobilization of Cr(VI) in Groundwater Using Hydrogen Release Compound

详细信息    查看全文

• 作者：Boris Faybishenko ; Terry C. Hazen ; Philip E. Long ; Eoin L. Brodie ; Mark E. Conrad ; Susan S. Hubbard ; John N. Christensen ; Dominique Joyner ; Sharon E. Borglin ; Romy Chakraborty ; Kenneth H. Williams ; Jo
• 刊名：Environmental Science & Technology
• 出版年：2008
• 出版时间：November 15, 2008
• 年：2008
• 卷：42
• 期：22
• 页码：8478-8485
• 全文大小：489K
• 年卷期：v.42,no.22(November 15, 2008)
• ISSN：1520-5851

文摘

The results of a field experiment designed to test the effectiveness of a novel approach for long-term, in situ bioimmobilization of toxic and soluble Cr(VI) in groundwater using a hydrogen release compound (HRC)a slow release glycerol polylactateare described. The field experiment was conducted at the Hanford Site (Washington), a U.S. Department of Energy nuclear production facility, using a combination of hydrogeological, geophysical, geochemical, and microbiological measurements and analyses of water samples and sediments. The results of this experiment show that a single HRC injection into groundwater stimulates an increase in biomass, a depletion of terminal electron acceptors O₂, NO₃⁻, and SO₄²⁻, and an increase in Fe²⁺, resulting in a significant decrease in soluble Cr(VI). The Cr(VI) concentration has remained below the background concentration in the downgradient pumping/monitoring well, and below the detection limit in the injection well for more than 3 years after the HRC injection. The degree of sustainability of Cr(VI) reductive bioimmobilization under different redox conditions at this and other contaminated sites is currently under study.