Field Testing of Activated Carbon Mixing and In Situ Stabilization of PCBs in Sediment at Hunters Point Shipyard Parcel F, San Francisco Bay, California

摘要

Prior laboratory studies and a preliminary field pilot-scale study showed that the addition of activated carbon (AC) to sediment contaminated with polychlorinated biphenyls (PCB) significantly reduced the chemical and biological availability of PCBs. Encouraged by those results, we recently completed a field-scale project (ER-0510) to demonstrate that AC sorbent mixed with sediment is a cost-effective, in situ, nonremoval, management strategy for reducing risk and the bioavailability of PCBs in offshore sediments at the Hunters Point Shipyard site. In order to achieve these goals, we identified three primary objectives for the scope of this project: * Demonstrate and compare the effectiveness, in terms of AC application and ease of use, of two available large-scale mixing technologies; * Demonstrate that AC treatment reduces PCB bioaccumulation in field tests; *Demonstrate no significant sediment resuspension and PCB release after the large-scale mixing technologies are used.