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Cost-Effective Treatment of PCB-Contaminated Sediments

Large areas of rivers have been contaminated with Polychlorinated Biphenyls (PCBs). The scale of these cleanup can range from a few thousand cubic yards to several hundred thousand cubic yards. Innovative environmental technologies that can treat these large areas of contaminated sediment and significantly reduce the treatment cost to less than landfill cost are needed. One such technology, which has been tested at pilot scale, holds particular promise to cost effectively and safety de-water and treat large volumes of sediment in holding cells adjacent to the rivers. Upon completion of treatment, the soil would remain in place or be used by the community. Large Cell Solvent Extraction (LCSE) technology will be discussed and results of pilot work in Alaska on 200 cubic yards of soil will be presented by the author. The construction of these cells, movement of the sediment in slurry, de-watering the cells, solvent extraction treatment of the cells and final disposition of the soil will be presented.