In-situ porous reactive wall for treatment of Cr(VI) and trichloroethylene in groundwater

Conference · Wed Dec 31 04:00:00 EST 1997

OSTI ID:576670

Blowes, D W; Bennett, T A; Gillham, R W ^[1]

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1. Univ. of Waterloo, Ontario (Canada); and others

A permeable reactive wall for treating groundwater contaminated with hexavalent chromium (Cr(VI)) and trichloroethylene (TCE) was installed at the U.S. Coast Guard Support Center in Elizabeth City, NC in June, 1996. The porous reactive wall is 46 m long, 0.6 m wide, and 7.3 m deep. The reactive wall was installed in less then six hours using a continuous trenching technique which simultaneously removed the aquifer material and replaced it with reactive material. The wall is composed of 100% elemental iron in the form of iron filings. Preliminary laboratory experiments, with site groundwater and reactive materials similar to the full-scale wall components, were successful in decreasing 11 mg/L Cr(VI) to < 0.01 mg/L and 1700 {mu}g/L TCE to < 1 {mu}g/L. Detailed field monitoring commenced in November, 1996. The monitoring program includes groundwater sampling upgradient, downgradient and within the reactive wall, and collection of core samples for mineralogical and microbiological study. Preliminary results from the monitoring program indicate that the wall successfully removes Cr(VI) from influent concentrations of 6 mg/L to < 0.01 mg/L, and TCE from 5600 {mu}g/L to 5.3 {mu}g/L within the wall.

• Research Organization: USDOE, Washington, DC (United States)
• OSTI ID: 576670
• Report Number(s): CONF-970208--Proc.; ON: DE98001967
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
CHLORINATED ALIPHATIC HYDROCARBONS
CHROMIUM
CONTAINMENT
GROUND WATER
IRON
MONITORING
REMEDIAL ACTION