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TREATMENT OF ARSENIC AND METALS IN GROUND WATER USING A COMPOST-ZVI PRB
Citation:
LUDWIG, R. D., D. G. JEWETT, ANN AZADPOUR-KEELEY, F. P. BECK, S. D. ACREE, R. R. ROSS, P. K. JONES, D. BLOWES, D. SMYTH, AND L. SPINK. TREATMENT OF ARSENIC AND METALS IN GROUND WATER USING A COMPOST-ZVI PRB. Presented at The Eighth International Symposium, In Situ and On-Site Bioremediation, Baltimore, MA, June 06 - 09, 2005.
Impact/Purpose:
To inform the public.
Description:
A pilot permeable reactive barrier (PRB) consisting of a mixture of leaf compost, zero-valent iron (ZVI), limestone and pea gravel was installed at a former phosphate fertilizer manufacturing facility in Charleston, S.C. in September 2002. The PRB is designed to treat arsenic and heavy metals in ground water entering a tidal marsh by promoting microbially mediated sulfate reduction and subsequent sulfide precipitation. In addition, the PRB is designed to generate alkalinity from the sulfate reduction process to aid in neutralizing acid-impacted sediments down gradient of the PRB. Five rounds of performance monitoring conducted at the site over a period of 18 months since installation of the pilot PRB has thus far shown effective treatment of arsenic and heavy metals in the ground water. Monitoring of the PRB will continue to determine whether performance can be sustained over the long term. This is an abstract of a proposed presentation and does not necessarily reflect EPA policy.