Abstract: A rotating cylindrical containment tool that removes contaminated sediment and prevents the dispersion of contaminated sediments during excavation. The tool casing is rotated and is forced down into the sediment whereby the sediment rises up into the interior of the casing. Water flows into and out of the casing based on external and internal pressures. After the sediment rises into the cylindrical casing a feed auger assembly extending therefrom is utilized to deliver materials and/or cap the excavated void space in the sediment. Alternatively, the rotating containment tool prevents the dispersion of contaminated sediments and treats contaminated sediment in situ with treatment reagents, in the sub-aqueous environment.

Abstract: The present invention relates to a process for managing wastes and reclaiming landfill sites by using the inherent void space that exits within municipal solid waste landfills. The process comprises the injection of selected wastes and additives under pressure into the void space of existing landfills. Various materials can be added to the selected waste form such as hydraulic cement, lime, coal fly ash, waste fixing agents, buffering agents, water and plasticizers. These additives can assist in adding strength to the waste form, creating an insoluble waste material, adjusting the pH environment of the injected material, and enhancing its flowability. Depending on the waste type and additives, the process can be used to encapsulate wastes already existing within the landfill, reduce the permeability of the landfill, fix waste contaminants within the landfill to prevent them from leaching, increase the bearing capacity of the landfill, and reduce the ultimate settlement of the landfill.