| Title: |
Interactions Between Biological and Abiotic Pathways in the Reduction of Chlorinated Solvents.
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| Resource Type: |
web links
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| Producers or distributor |
Richard A. Brown, PhD (technical director for ERM, Inc. based in Ewing, New Jersey).
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| Other producers or distributors: |
James G. Mueller, PhD, is president and director of remedial strategies at Adventus Americas Inc., in
Corona Del Mar, California.
Alan G. Seech, PhD, is chief executive officer and director of technology for Adventus Americas Inc., in
Corona Del Mar, California.
James K. Henderson, PhD, is a project director for the DuPont Corporate Remediation Group based
in Charlotte, North Carolina.
John T. Wilson, PhD, is a research microbiologist with the US EPA National Risk Management Research
Laboratory, in Ada, Oklahoma.
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| Author / Producer Type: |
Consultancy, contractor or other service provider
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EUGRIS Keyword(s): |
Diffuse pollution-->Contaminants-->Contaminants overview
Diffuse pollution-->Diffuse pollution overview
Groundwater protection-->Groundwater protection overview
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| Short description: |
While biologically mediated reductive dechlorination continues to be a significant focus of chlorinated solvent remediation, there has been an increased interest in abiotic reductive processes for the remediation of chlorinated solvents.
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| Long description: |
In situ chemical reduction (ISCR) uses zero-valent iron (ZVI)–based technologies, such as nanoscale iron and bimetallic ZVI, as well as naturally occurring reduced minerals incorporating dual-valent iron (DVI), such as magnetite, green rust, and iron sulfides that are capable of dechlorinating solvents. A more recent area of development in ISCR has been in combining biological and abiotic processes. There are several ways in which biological and abiotic processes can be combined. First, the interaction between the two may be “causative.” A second type of interaction between abiotic and biotic processes is “synergistic.” For example, biological processes can enhance the activity of reduced metals/minerals. This is the basis of the EHC® ISCR technologies, which combine ZVI with a (slowly) degradable carbon substrate. This combination rapidly creates buffered, strongly reducing conditions, which result in more complete solvent degradation (i.e., direct mineralization). The extent and level of reducing activity commonly observed are much greater when both the carbon substrate and the ZVI are present. When the carbon substrate is expended, the reducing activity due to ZVI alone is much less. The understanding of biogeochemical processes and their impact on abiotic processes is still developing. As that understanding develops, new and improved methods will be created to enhance volatile organic compound destruction.
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Submitted By:
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Mr Michael Mueller WhoDoesWhat?
Last update: 02/02/2010
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