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DEMONSTRATION OF IN SITU TREATMENT WITH REACTIVE AMENDMENTS FOR CONTAMINATED SEDIMENTS IN ACTIVE DOD HARBORS
Kirtay, V., G. Rosen, M. Colvin, J. Guerrero, L. Hsu, E. Arias, R.K. Johnston, B. Chadwick, et al.
ESTCP Project ER-201131, 884 pp, 2017
In situ remediation of PCB-contaminated surface sediment was demonstrated by placing a reactive amendment (powdered activated carbon, or PAC) at a site located at the Puget Sound Naval Shipyard and Intermediate Maintenance Facility, Bremerton, Wash. The PAC was placed successfully on the seafloor of a half-acre target site to sorb PCBs in sediments, thereby reducing bioavailability and limiting bioaccumulation of contaminants into the tissues of benthic invertebrates. The sorbent material, AquaGate+PAC, was manufactured by coating an aggregate core with PAC held in a bentonite clay binder. The AquaGate, which is denser than water, sinks rapidly through the water column directly to the surface of the sediment. Over a short period of time (days), the PAC coating of the AquaGate releases from the aggregate, and bioturbation incorporates the PAC into the surface sediments over time. This project demonstrated the placement and quantitative integration of a suite of common and novel monitoring tools to evaluate amendment stability and performance in deep water (15 m) at an active Naval shipyard with high vessel traffic. https://www.estcp.com/content/download/41983/400036/file/ER-201131%20Final%20Report.pdf
ESTCP Project ER-201131, 884 pp, 2017
In situ remediation of PCB-contaminated surface sediment was demonstrated by placing a reactive amendment (powdered activated carbon, or PAC) at a site located at the Puget Sound Naval Shipyard and Intermediate Maintenance Facility, Bremerton, Wash. The PAC was placed successfully on the seafloor of a half-acre target site to sorb PCBs in sediments, thereby reducing bioavailability and limiting bioaccumulation of contaminants into the tissues of benthic invertebrates. The sorbent material, AquaGate+PAC, was manufactured by coating an aggregate core with PAC held in a bentonite clay binder. The AquaGate, which is denser than water, sinks rapidly through the water column directly to the surface of the sediment. Over a short period of time (days), the PAC coating of the AquaGate releases from the aggregate, and bioturbation incorporates the PAC into the surface sediments over time. This project demonstrated the placement and quantitative integration of a suite of common and novel monitoring tools to evaluate amendment stability and performance in deep water (15 m) at an active Naval shipyard with high vessel traffic. https://www.estcp.com/content/download/41983/400036/file/ER-201131%20Fin
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