Contaminated sediment remediation vessel

A mobile marine system performing at least one of in-situ treatment and in-situ conditioning of contaminated sediments from the sediment bottom surface of a water body comprising:

• at least one floating marine vessel,
• said at least one floating marine vessel having suspendable therefrom at least one continuous mobile/submersible vertical barrier wall defining at least one predetermined confined control zone,
• said confined control zone containing liquid and suspended particles dispersed during at least one of an in-situ treatment and an in-situ conditioning process from a predetermined bottom sediment surface area below said at least one floating marine vessel,
• wherein said at least one mobile/submersible vertical barrier wall defining at least one predetermined confined control zone comprises at least one predetermined collection perimeter of a plurality of adjacent aligned sheet piles attached to an inner hull of said at least one floating marine vessel, said sheet piles being lowerable and driven into the area of bottom sediments, said at least one collection of said sheet piles defining a perimeter area encompassing a predetermined volume of said at least one control zone;
• and,
• at least one vertically extending pressurized sealing system on an exterior side of said at least one collection of sheet piles.

A mobile marine system performing at least one of in-situ treatment and in-situ conditioning of contaminated sediments from the sediment bottom surface of a water body comprising:

• at least one floating marine vessel,
• said at least one floating marine vessel having suspendable therefrom at least one continuous mobile/submersible vertical barrier wall defining at least one predetermined confined control zone,
• said vertical barrier wall comprised of individual movable sheets capable of contouring to the bottom of the surface of the waterway;
• said control zone continuously containing water of the water body on respective outer and inner sides of said vertical barrier wall, said confined control zone containing liquid and suspended particles dispersed during at least one of an in-situ treatment and an in-situ conditioning process from a predetermined bottom sediment surface area below said at least one floating marine vessel,
• a marine-based solids handling system stabilizing said treated sediments into a solid disposable member transferable to an on-shore handling facility,
• a means for transporting and mixing cementitious stabilizing reagent(s) with said excavated sediments, a means for storing said cementitious reagent(s), and a means for distributing stabilized sediments into containers for transport, and,
• a conveyor arrangement and distribution hopper system for mixing, transporting and distributing said excavated sediments into containers for transport and a silo for storing said stabilizing reagent(s).

A mobile marine system performing at least one of in-situ treatment and in-situ conditioning of contaminated sediments from the sediment bottom surface of a water body comprising:

• at least one floating marine vessel,
• said at least one floating marine vessel having suspendable therefrom at least one continuous mobile/submersible vertical barrier wall defining at least one predetermined confined control zone,
• said confined control zone containing liquid and suspended particles dispersed during at least one of an in-situ treatment and an in-situ conditioning process from a predetermined bottom sediment surface area below said at least one floating marine vessel, and,
• a delivery system dispensing one mixing reagent capable of treating the contaminated sediment directly to the sediment bottom surface.

A method for treating a contaminated subsurface floor and body of water during sediment remediation operations comprising the steps of:

• positioning a containment marine vessel over said zone;
• lowering and inserting a plurality of sheet piles adjacent to a inner hull of said vessel into the bottom of the body of water and driving said piles into the subsurface formation to form a continuous loop surrounding said predetermined control zone;
• lowering a pressurized sealing system located on an external side of said continuous loop of said sheet piles to the subsurface floor of the body of water;
• initiating fluid flow into said at least one water treatment vessel positioned at the site to induce a negative pressure gradient into said predetermined control zone;
• and,
• providing a delivery system delivering at least one chemical reagent to said contaminated subsurface floor of said body of water.

A method for containing and removing micron-sized and sub-micron sized contaminants from a subsurface sediment floor and a body of water and containing treatment reagents during at least one of in-situ treatment and an in-situ conditioning operation comprising the steps of

• positioning a containment marine vessel over said zone;
• lowering and inserting a plurality of sheet piles adjacent to an inner hull of said vessel into the bottom of the body of water and driving said piles into the subsurface formation to form a continuous loop surrounding said predetermined control zone;
• lowering a hydropneumatic sealing system located on an external side of said continuous loop of said sheet piles to the subsurface floor of the body of water;
• initiating fluid flow into said at least one water treatment vessel positioned at the site to induce a negative pressure gradient into said predetermined control zone;
• delivering and mixing at least one of a treatment and a conditioning reagent with the subsurface sediments.

A mobile marine system performing extraction of contaminated sediments from the sediment bottom surface of a water body comprising:

• at least one floating marine vessel,
• said at least one floating marine vessel having suspendable therefrom at least one continuous mobile/submersible vertical barrier wall defining at least one predetermined confined control zone,
• said vertical barrier wall comprised of individual movable sheets capable of contouring to the bottom of the surface of the waterway;
• said control zone continuously containing water of the water body on respective outer and inner sides of said vertical barrier wall, said confined control zone containing liquid and suspended particles dispersed during sediment excavation,
• said at least one floating marine vessel continuously floating during said sediment extraction process,
• wherein said at least one mobile/submersible vertical barrier wall defining at least one predetermined confined control zone comprises at least one predetermined collection perimeter of a plurality of adjacent aligned sheet piles attached to an inner hull of said at least one floating marine vessel, said sheet piles being lowerable and driven into the area of bottom sediments, said at least one collection of said sheet piles defining a perimeter area encompassing a predetermined volume of said at least one control zone,
• at least one vertically extending pressurized sealing system on an exterior side of said at least one collection of sheet piles.