Interfacial Reduction-Oxidation Mechanisms Governing Fate and Transport of Contaminants in the Vadose Zone

Deng, B. ; Thornton, Edward C. ; Olsen, Khris B. ; Cantrell, Kirk J. ; Amonette, James E.

New Mexico Institute of Mining and Technology

关键词: Soils;    Hydrogen Sulfides;    54 Environmental Sciences;    Transport;    Field Tests;   

DOI  :  10.2172/833522
RP-ID  :  EMSP-70088--2001
RP-ID  :  FG07-99ER15011
RP-ID  :  833522

美国|英语

来源: UNT Digital Library

【 摘 要 】

Immobilization of toxic and radioactive metals (e.g., Cr, Tc, and U) in the vadose zone by in situ gaseous reduction using hydrogen sulfide (H2S) is a promising technology the U.S. Department of Energy (DOE) is developing for soil remediation. Earlier laboratory studies have shown that Cr(VI) in a number of soil samples can be effectively immobilized by treatment with dilute gaseous H2S. A field test has also been completed that resulted in 70% immobilization of Cr(VI). The objective of this project is to characterize the interactions among H2S, the metal contaminants, and soil components. Understanding these interactions is needed to assess the long-term effectiveness of the technology and to optimize the remediation system.