Field evidence for flow reduction through a zero-valent iron permeable reactive barrier

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Authors:Johnson, R. L.; Thoms, R. B.; Johnson, R. O'Brien; Krug, T.
Author Affiliations:Primary:
Oregon Health and Science, Department of Environmental and Biomolecular System, Beaverton, OR, United States
Geosyntec Consultants, Canada
Volume Title:Ground Water Monitoring & Remediation
Source:Ground Water Monitoring & Remediation, 28(3), p.47-55. Publisher: Blackwell for National Ground Water Association, Malden, MA, United States. ISSN: 1069-3629
Publication Date:2008
Note:In English. 31 refs.; illus., incl. 2 tables
Summary:The combination of detailed multilevel ground water geochemistry samples, a natural-gradient tracer test, minislug tests, and a numerical flow and transport model was used to examine flow through a zero-valent iron permeable reactive barrier (PRB) installed to remove explosives from ground water. After 20 months of operation, the PRB continued to completely remove explosives from the ground water flowing through it. However, the data indicate that a portion of ground water flow was being diverted beneath the PRB. Ground water geochemistry was significantly altered by the PRB, and concentrations of some ions, including sulfate, carbonate, and calcium, were substantially reduced due to precipitation. Field data and numerical model results indicate that, after 20 months of operation, flow through the PRB was reduced to approximately one-third of its expected value.
Subjects:Alkaline earth metals; Bromide ion; Bromine; Calcium; Carbonate ion; Chemical reactions; Contaminant plumes; Decontamination; Disposal barriers; Dissolved oxygen; Ground water; Halogens; Hydraulic conductivity; Metals; Military facilities; Monitoring; Numerical models; Oxygen; Permeability; Pollutants; Pollution; Precipitation; Preferential flow; Reduction; Remediation; Solutes; Sulfate ion; Suspended materials; Techniques; Tracers; Waste disposal; Water treatment; Hall County Nebraska; Nebraska; United States; Cornhusker Army Ammunition Plant; Grand Island Nebraska; Zero-valent iron
Coordinates:N404000 N410300 W0981700 W0984300
Record ID:2009039927
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute.
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