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Title: Subsurface fate and transport of cyanide species at a manufactured-gas plant site

Cyanide is present at manufactured-gas plant (MGP) sites in oxide-box residuals, which were often managed on-site as fill during active operations. Cyanide can leach from these materials, causing groundwater contamination. Speciation, fate, and transport of cyanide in a sand-gravel aquifer underlying an MGP site in the upper Midwest region of the US were studied through characterization, monitoring, and modeling of a plume of cyanide-contaminated groundwater emanating from the site. Results indicate that cyanide in the groundwater is primarily in the form of iron-cyanide complexes (>98%), that these complexes are stable under the conditions of the aquifer, and that they are transported as nonreactive solutes in the sand-gravel aquifer material. Weak-acid-dissociable cyanide, which represents a minute fraction of total cyanide in the site groundwater, may undergo chemical-biological degradation in the sand-gravel aquifer. It seems that dilution may be the only natural attenuation mechanism for iron-cyanide complexes in sand-gravel aquifers at MGP sites.
Authors:
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Publication Date:
OSTI Identifier:
20001044
Resource Type:
Journal Article
Resource Relation:
Journal Name: Water Environment Research; Journal Volume: 71; Journal Issue: 6; Other Information: PBD: Sep-Oct 1999
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; COAL GASIFICATION PLANTS; CYANIDES; ENVIRONMENTAL IMPACTS; ENVIRONMENTAL TRANSPORT; WATER POLLUTION; GROUND WATER