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In Situ Reduction-Oxidation (or Redox) Manipulation (ISRM) is a remarkable new technology that can revolutionize the way contaminated groundwater is treated throughout the world. In the ISRM process developed at Pacific Northwest National Laboratory, a non-toxic chemical reducing agent (in this case, sodium dithionite) is pumped from tanker trucks into groundwater wells to create an in situ treatment zone within a contaminant plume. The treatment destroys or immobilizes chemically reducible metallic and organic contaminants under natural flow conditions.

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Document Title: In Situ Redox Manipulation
Category: Environmental Remediation
Media Type: Photos
Date of Image/Photo: 1997
Background: In Situ Redox Manipulation (ISRM) is a remarkable new technology that can revolutionize the way contaminated groundwater is treated throughout the world. This innovative remediation technique safely, permanently and cost-effectively destroys or immobilizes toxic and carcinogenic contaminants within an aquifer. The process involves injecting a non-toxic chemical solution into the aquifer through a groundwater well, effectively creating an in situ treatment zone within the contaminant plume. The treatment destroys or immobilizes chemically reducible metallic and organic contaminants under natural flow conditions. ISRM has successfully treated chromium contamination in the groundwater that threatens salmon beds in the Hanford Reach of the Columbia River in Washington State. The technology is applicable on a wide scale of contaminants such as technetium, uranium, chlorinated solvents, carbon tetrachloride, and chromate. ISRM won a 1998 R&D 100 Award.
URL of this page: http://picturethis.pnl.gov/picturet.nsf/by+id/SMAA-3XKPUD

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