Abstract: A method of removing contaminated sediment material from a contaminated area on the ocean floor using a reactor vessel wherein seawater is from within the interior of the reactor vessel so that the vessel penetrates the ocean floor. A pressurized fluid is introduced into the reactor vessel to create a slurry vortex of the contaminated sediment material and then a remediation fluid injected into the slurry vortex of the contaminated sediment material using a sufficient amount of the remediation fluid to remediate the contaminated sediment material and provide a noncontaminated sediment material. Pressurized seawater is injected into the interior of the reactor vessel to create a positive pressure within the reactor vessel to lift the reactor vessel above the ocean floor allowing for a transfer of the reactor vessel to another area of sediment contamination on the ocean floor.

Abstract: A method of removing contaminated sediment material from a contaminated area on the ocean floor using a reactor vessel wherein seawater is from within the interior of the reactor vessel so that the vessel penetrates the ocean floor. A pressurized fluid is introduced into the reactor vessel to create a slurry vortex of the contaminated sediment material and then a remediation fluid injected into the slurry vortex of the contaminated sediment material using a sufficient amount of the remediation fluid to remediate the contaminated sediment material and provide a noncontaminated sediment material. Pressurized seawater is injected into the interior of the reactor vessel to create a positive pressure within the reactor vessel to lift the reactor vessel above the ocean floor allowing for a transfer of the reactor vessel to another area of sediment contamination on the ocean floor.

Abstract: A reactor vessel for in situ cleanup of contaminated sediments in an underwater environment. A slurry is generated within the reactor vessel after the reactor vessel penetrates an area of the seabed which includes severely contaminated sediments. The contaminated sediments contained within the reactor are entrained into the slurry created by a circulation pump in combination with discharge flow jets mounted in a radial network inside the reactor vessel. Anchoring vanes attached to the exterior of the reactor vessel resist torque moment induced by the slurry vortex. A remediation fluid is injected into the slurry and controlled by circulation to and from a holding/process tank of the portable surface treatment unit. Following treatment, the reactor vessel is removed from the sediment by reversing the emplacement procedure and is relocated and reset on an adjacent area.