Activated Carbon Pilot Study
The Lower Duwamish Waterway Group partners conducted a pilot study (February 2017) to determine if activated carbon, a common purifier in household water filters, traps contaminants in waterway sediments. The study was designed to see how much polychlorinated biphenyls (PCBs) and other pollutants can be prevented from entering the food chain. The pollutants are trapped by activated carbon that is mixed in a thin layer of clean material (either sand or gravely sand) and placed over existing contaminated sediments. This method, if successful, could be used in the cleanup of the Lower Duwamish Waterway.