Apparatus for removal and collection of duckweed from a body of water comprising an engine, a turbine duckweed collection assembly having a housing with a duckweed collection inlet, a duckweed discharge outlet, and a well located between collection inlet and discharge outlet, a series of spaced elements supported on a rotatable shaft and located within well with the shaft connected to the combustible engine to rotationally drive spaced elements within well to create a vortex pumping action in the body of water drawing free floating duckweed into collection inlet, through well and out from discharge outlet, a platform supporting combustible engine and turbine duckweed collection assembly in an upright condition, and a collection manifold assembly connected to discharge outlet and includes a water permeable collection bag receiving and collecting duckweed while allowing water to escape therethrough and return back to the body of water.

A skimming and separation device comprising an outer casing (1) provided with constructions to directly or indirectly fasten all parts, defining a compartment (2), and a floater (3) configured to create the skimming function of the device, the floater is attached at its lower side to an essentially vertically arranged bellow (4) allowing the floater to adapt flow into a substantially circus volume and allowing the floater to move from an upper position with essentially no flow into the compartment (2) to a lower position allowing flow of water and debris follow the contours of the floater (3) in a downward direction into the device. A power device (8) is provided and includes a propeller to achieve in-flow and outflow of the device. The device further comprises a central tube (c) arranged along a vertical center axis of the compartment and configured to receive said flow of water and debris, and at least one central rotation member being structured to generate a downward directed and central rotating flow of said water and debris within said central tube (c).

A device having a funnel structure (connected to a separating arrangement by a base pipe is disclosed. The base pipe is horizontal and arranged between the funnel structure and the base pipe. The base pipe is also a vertical suction pipe. The device includes a pressure pipe which is parallel to the base pipe. The funnel structure is slightly below the water surface. In operation, water and floating waste pass over the edges of the funnel structure and swirl into the suction pipe. A jet of water may be injected through the pressure pipe to the base pipe. A flow gradient may then be formed in the base pipe and the differently sized waste objects may separate. If the water contains liquid waste, the speed of the water jet may be adjusted in such a way that the liquid waste and water do not form an emulsion.

A marine debris collection device includes a first debris collector to remove non-minute debris contained in debris floating on water by allowing the debris to flow thereinto together with the water, and a second debris collector to remove minute debris by adsorbing the minute debris onto a microbubble generated when the water flows into the second debris collector from the first debris collector via a connection pipe.

A device having a funnel structure (connected to a separating arrangement by a base pipe is disclosed. The base pipe is horizontal and arranged between the funnel structure and the base pipe. The base pipe is also a vertical suction pipe. The device includes a pressure pipe which is parallel to the base pipe. The funnel structure is slightly below the water surface. In operation, water and floating waste pass over the edges of the funnel structure and swirl into the suction pipe. A jet of water may be injected through the pressure pipe to the base pipe. A flow gradient may then be formed in the base pipe and the differently sized waste objects may separate. If the water contains liquid waste, the speed of the water jet may be adjusted in such a way that the liquid waste and water do not form an emulsion.

A skimming and separation device comprising an outer casing (1) provided with constructions to directly or indirectly fasten all parts, defining a compartment (2), and a floater (3) configured to create the skimming function of the device, the floater is attached at its lower side to an essentially vertically arranged bellow (4) allowing the floater to adapt flow into a substantially circum volume and allowing the floater to move from an upper position with essentially no flow into the compartment (2) to a lower position allowing flow of water and debris follow the contours of the floater (3) in a downward direction into the device. A power device (8) is provided and includes a propeller to achieve in-flow and outflow of the device. The device further comprises a central tube (c) arranged along a vertical center axis of the compartment and configured to receive said flow of water and debris, and at least one central rotation member being structured to generate a downward directed and central rotating flow of said water and debris within said central tube (c).

Apparatus for removal and collection of duckweed from a body of water comprising an engine, a turbine duckweed collection assembly having a housing with a duckweed collection inlet, a duckweed discharge outlet, and a well located between collection inlet and discharge outlet, a series of spaced elements supported on a rotatable shaft and located within well with the shaft connected to the combustible engine to rotationally drive spaced elements within well to create a vortex pumping action in the body of water drawing free floating duckweed into collection inlet, through well and out from discharge outlet, a platform supporting combustible engine and turbine duckweed collection assembly in an upright condition, and a collection manifold assembly connected to discharge outlet and includes a water permeable collection bag receiving and collecting duckweed while allowing water to escape therethrough and return back to the body of water.

Provided is a method and a system for removal of oil under ice through an opening made into ice. The system includes oil booms extending under ice in two different directions from the opening so as to constitute an angle of less than 180 degrees between each other; an oil collection device placed in the opening; and a propulsion device placed on the level of the lower surface of ice at a distance from the opening in the area of the angle so as to provide a flow directed towards the opening between the oil booms in the area of the angle.