Efficiency of Capping Contaminated Dredged Material

by J. M. Brannon, US Army Engineer Waterways, Experiment Station, Environmental, Lab, Vicksburg, MS, USA,
R. E. Hoeppel, US Army Engineer Waterways, Experiment Station, Environmental, Lab, Vicksburg, MS, USA,
D. Gunnison, US Army Engineer Waterways, Experiment Station, Environmental, Lab, Vicksburg, MS, USA,



Document Type: Proceeding Paper

Part of: Dredging and Dredged Material Disposal

Abstract: The ability of capping with sand to chemically and biologically isolate contaminated dredged material was investigated using large scale (250 l) laboratory reactor units. Tissue analyses of Rangia suspended in the water column showed that a 5 cm cap was not totally effective in preventing transfer of contaminants such as PCB's and polyaromatic hydrocarbons to biota. Rangia suspended in water overlying dredged material capped with 50 cm of sand did not show elevated tissue concentrations during the 40 day course of the experiment, even in the presence of severe bioturbation by the polychaete Nereis. Chemical and microbial results indicated that Nereis breached both the 5 cm and 50 cm cap during the experiment.

Subject Headings: Dredged materials | Sand (material) | Chemicals | Laboratory tests | Soil pollution | Biological processes

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