Effectiveness of Very thin soil Layers in Chemical Release form Bed Sediment

摘要

The chemical containment effectiveness of both the nat- ural recovery and the "particle broadcasting" processes for remediating contaminated be-sediments depend upon very thin soil and/or sand layers millimeters in depth. Conven- tional capping for in situ chemical containment of bed-sedi- ment or dredged material typically involves thick layers of 30 to 90 centimeters in depth. Few studies have been conducted with thin layers of candidate natural materials. A steady- state benzoic acid dissolution test apparatus and procedure, devised to realistically simulate bed-sediment chemo- dynamic conditions, was used to measure chemical flux through thin layers (1 to 8 mm) of soil, sand, and ideal porous media.