Environmental Restoration Project ER-200835 involved field demonstrations of in-situ treatment of sediment contamination with activated carbon (AC) delivered using the SediMite® delivery system. While ER-200835 focused on Canal Creek at the Aberdeen Proving Ground (APG) in Maryland, data from two other sites—Bailey Creek at Ft. Eustis, Virginia, and Berrys Creek in the Hackensack Meadowlands of New Jersey—are incorporated, to broaden the assessment and enable the evaluation of performance for various types of habitats. Collectively, the report provides information on the treatment efficacy of activated carbon delivered by SediMite® for two wetland/marsh environments and two tidal creeks. Contaminants present in sediments and/or wetland soils at one or more of these sites include polychlorinated biphenyls (PCBs), dichlorodiphenyltrichloroethane (DDT) and related degradation products (DDx), and mercury.
The treatment material—SediMite®—is agglomerate that is composed of the treatment agent (AC in this case), a weighting agent, and an inert binder. The agglomerate is manufactured as pellets that can be easily handled and dispersed. The product is delivered using either blower-type devices (Vortex) or spreaders. An application of SediMite® by tele-belt has also been performed for Mirror Lake in Delaware. Once the pellets are distributed on sediments or wetland soils, the SediMite® pellets disaggregate and release the active treatment agents.
The projects demonstrated that: