NL2027092B1

NL2027092B1 - Device for removing waste, such as plastic waste, and use of such a device

Info

Publication number: NL2027092B1
Application number: NL2027092A
Authority: NL
Inventors: Van Der Linden Bowien; Rubio Velasco Alejandra; Eikelenboom Elina; Teun Pierhagen Douwe; Auke De Vries Rinze; Mulder Jelmer; Mehta Parshva
Original assignee: Noria B V
Priority date: 2020-12-11
Filing date: 2020-12-11
Publication date: 2022-07-08

Abstract

The invention relates to a device for removing waste, such as plastic waste, from water, in particular from a water surface or near said water surface, said device comprising: a rotatable screw, said rotatable screw having a screw blade being arranged to transport waste from said water to a waste collecting element, and — said waste collecting element. The invention further relates to the use of such a device.

Description

DEVICE FOR REMOVING WASTE, SUCH AS PLASTIC WASTE, AND USE OF SUCH A DEVICE The invention relates to a device for removing waste, such as plastic waste, from water, in particular from a water surface or near said water surface.

Many waters are polluted by waste, in particular plastic waste. It is an object of the invention to provide a solution for this problem or at least reduce this problem.

This object is met by a device according to the type described in the preamble, comprising: - a rotatable screw, said rotatable screw having a screw blade being arranged to transport waste from said water to a waste collecting element, and - said waste collecting element.

Said device may in particular be arranged in or on the water such that a water inlet end of the screw blade extends slightly, for example about 30 cm, into the water, at least during a part of the rotation of the screw, and is thereby able to take up waste from said water surface or near said water surface, i.e. just below said water surface, wherein said waste is transported along the path of the screw blade in the direction of the waste collecting element. Said screw blade also transports some water, such that the waste can float on the water transported by the screw blade and is thereby easily transported and easily enters the waste collecting element. The waste removed by the device may in particular be waste that floats near the water surface, in particular on or just below said water surface, such as plastic waste.

The waste collecting element may be provided at any suitable location. For example, said waste collecting element may be provided close to an outlet end of the screw blade, such that the waste can enter the waste collecting element when it reaches the end of the screw blade.

The rotatable screw may be designed and/or shaped in any suitable way. In particular the screw blade thereof may be designed and/or shaped such that waste and some water is efficiently transported thereby. The rotatable screw can alternatively be referred to as a rotatable screw pump and/or rotatable screw conveyor, which is able to pump, respectively convey, said waste and/or water. The rotatable screw can be made of any suitable material, such as metal or plastic.

As a result of the rotatable screw being designed and/or shaped for transporting said waste and/or water, it is not required to enclose said screw, for example by means of a casing or pipe, at least not for being able to transport said waste and/or water. The screw may thus be an open screw. However, if desired, for example due to safety requirements, the screw or a part thereof, for example an upper part, may be enclosed, for example by a said casing or pipe.

The rotatable screw may have in particular one screw blade, but if desired more than one screw blade may be provided.

The waste collecting element may be designed and/or shaped in any suitable way. For example, the waste collecting element may be a container of any suitable shape and/or made from any suitable material, such as for example metal or plastic. The container may be a flexible container or a non-flexible container.

In particular one waste collecting element may be provided, but if desired more than one waste collecting element may be provided.

The water from which the device removes waste may be any kind of water, such as for example a river, canal, lake, sea or ocean. More in particular the device may be particularly designed for city canals and/or recreational swimming areas.

In an embodiment of the device according to the invention said waste collecting element is provided in a center of said screw and extends substantially parallel to a central longitudinal axis of said screw, wherein said screw blade extends around said waste collecting element in a helical manner.

An advantage of such an embodiment is that this may provide a compact design of the device and/or that the waste may easily fall into the waste collecting element when it is at or near the end of the screw blade, In such an embodiment the waste collecting element may in particular have a substantially cylindrical shape, wherein the longitudinal axis of the waste collecting element extends substantially parallel to the central longitudinal axis of the screw and more in particular coaxially therewith.

The waste collecting element is preferably at least partly open for defining a waste receiving opening. For example the upper end of the waste collecting element may be at least partly open.

In another embodiment of the device according to the invention said waste collecting element comprises a cover, said cover comprising a waste receiving opening, wherein said waste receiving opening is provided in a lower part of said cover, at least in use of the device.

Said cover may in particular cover the open part, for example the upper end, of the waste collecting element. An advantage of such a cover may be that it may prevent or at least reduce rain from entering the waste collecting element and/or prevent or at least reduce the odour of the waste from spreading and/or may be esthetically pleasing and/or prevent birds from picking waste out of the waste collecting element. By providing the waste receiving opening at the lower part of said cover said waste may easily fall into the waste collecting unit when it passes the opening while being transported by the screw blade.

Said screw may in particular be rotatable with respect to the waste collecting element, i.e. the waste collecting element may not rotate while the screw rotates, such that the waste receiving opening may remain in said lower location. For example at least one and preferably multiple bearing(s) may be provided between the waste collecting element and the screw, such that the screw is able to rotate with respect to the waste collecting element.

In another embodiment of the device according to the invention said waste collecting element is removably connected to the device.

An advantage of this embodiment is that the waste collecting element can at least be temporarily removed from the device, for example when it is at least partly filled with waste, such that it can be emptied and/or replaced by an empty waste collecting element and/or cleaned.

The waste collecting element can in particular be removably connected to the screw, more in particular such that the waste collecting element is removable from its location in the center of the screw.

The waste collecting element may be emptied in any suitable way. For example, the waste collecting element may have a hingeable bottom, which bottom may be hingeable between a closed position for storing waste in the waste collecting element and an open position for emptying the waste collecting element. Locking means may be provided for locking the bottom in its closed position. Alternatively the waste collecting element may be emptied via its waste receiving opening, via the waste receiving opening in the cover, or said cover may be temporarily be removed for emptying the waste collecting element, or in any other suitable way.

The waste collecting element may be removed from the device in any suitable way. For example, the waste collecting element may have a hoisting means for hoisting the waste collecting element. For example the hoisting means may comprise at least one hoisting eye. Said hoisting eye may for example be part of or attached to the cover.

In another embodiment of the device according to the invention said device comprises water discharging means for discharging water.

it is advantageous if just enough water is transported by the screw blade for easily transporting the waste floating thereon, but not too much water. Alternatively or additionally, it may be advantageous if no water or only a small amount of water enters the waste collecting element. Alternatively or additionally, it may be advantageous if water that does enter the waste collecting element may be discharged therefrom. For for example any of the above reasons or other reasons said water discharging means may be provided.

Said water discharging means may for example comprise a water permeable part of the screw blade, for example a perforated part of the screw blade. The water permeable part of the screw blade may be provided at or near the inlet of the screw blade. The number and/or size of openings provided in the perforated screw blade part may be chosen in accordance with a suitable amount of water to be transported by the screw blade for said waste to able to float thereon while being transported by the screw blade.

Alternatively or additionally a water permeable part, for example a perforated part, may be provided as part of the waste collecting element near the outlet end of the screw blade and/or as part of the screw blade at or near the outlet end of the screw blade and/or as a transition element between the screw blade and the waste collecting element, which water permeable part may fluidly connect to an area outside of the waste collecting element, such that water may be removed from the waste just before entering the waste collecting element.

Alternatively or additionally said waste collecting element may have a water permeable bottom and/or lower end zone, for example a perforated bottom and/or lower end zone.

In another embodiment of the device according to the invention said screw is in a tilted upward position, at least during operation of said device, in which tilted upward position said screw is tilted upwards in a direction substantially upstream of a stream direction of said water and/or said waste and/or wind.

The waste may float into the direction of the screw by the water flowing in that direction and/or the wind blowing in that direction and/or due to any other reason.

The applicant has found that by tilting the screw upwards in a direction substantially upstream of a stream direction of said water and/or said waste and/or wind, waste can efficiently be taken up by the screw blade.

Upstream of said stream direction is thus opposite to the direction in which the water flows and/or waste floats and/or wind blows.

In particular a or said central longitudinal axis of the screw is in said tilted or inclined upward position, such that the upper end of the central longitudinal axis of the screw is located more upstream in the stream direction of said water and/or said waste and/or the wind than the lower end of the central longitudinal axis of the screw. lt is noted that the stream direction of the water and/or waste and/or wind may vary.

The position and/or orientation of the device may therefore be adaptable and/or changeable in accordance with a current and/or dominant stream direction of the water and/or waste and/or wind.

The applicant has found that an angle between said screw, in particular between a or said central longitudinal axis thereof, and the water surface is preferably between 30 and 45 degrees, more preferably between 35 and 40 degrees.

Such an angle has been shown to be most efficient in taking up the waste, but if desired any other angle can be chosen.

In another embodiment of the device according to the invention said screw is moveable between said tilted upward position and a substantially upright position.

Said tilted upward position may be said operational position and said substantially upright position may for example be a position in which the waste collecting element can easily be removed from or connected to said device, for example from or to said screw.

In another embodiment of the device according to the invention at least part of said screw blade is substantially basin shaped as seen in a transverse cross section in a radial direction and comprises an outer edge, which outer edge extends substantially parallel to a or said central longitudinal axis of the screw.

5 An advantage of said substantially basin shaped screw blade is that some water is transported thereby, such that the waste can float thereon. Said outer edge may keep said water and/or said waste on the screw blade.

It is noted that in particular this shape results in that the screw blade does not need to be enclosed, at least not for transporting said waste and/or water, as described above.

lt is noted that the shape of the screw blade may be different near or at the outlet end of the screw blade, wherein the shape of the screw blade near or at the outlet end may be chosen such that the waste may easily enter the waste collecting element.

Said outer edge may have any suitable height, for example approximately between 20 - 40 cm, more in particular between 30 — 35cm.

Said height may be chosen such that the outer edge does not connect to or touch a next turn of said screw blade, i.e. the outer edge does not fully enclose the screw blade.

In another embodiment of the device according to the invention said basin shaped screw blade, as seen in a radially outward direction, comprises a substantially flat first part and an upwardly inclined second part.

The applicant has found that such a basin shaped screw blade efficiently transports said water and waste floating thereon. A further advantage of such a shape is that the waste and/or water remains relatively close to the central axis of the screw during transportation, which may ease the waste entering the waste collecting element and/or provide stability to the screw.

As seen in the radially outward direction, the flat first part may define about 40-60% of the radial width of the screw blade and the upwardly inclined second part may define about 60-40% of the radial width of the screw blade. In particular each part may define about 50% of the radial width of the screw blade.

An angle between the flat first part and the upwardly inclined second part may be about 150 degrees. This angle is defined on the waste and/or water transporting side of the screw blade.

An angle between the flat first part and the central longitudinal axis of the screw blade may be about 90 degrees.

An angle between the upwardly inclined second part and the central longitudinal axis of the screw blade may thus be about 60 degrees. This angle is defined between the waste and/or water transporting side of the screw blade and the central longitudinal axis.

Said device may be arranged in or on the water in any suitable way. For example said device may comprise a frame, for example comprising spud poles, attached to the bottom of the water or to land located near the water, such as for example a quay. In such an embodiment the device is arranged in fixed manner. Alternatively said device may comprise a floating frame, such that the device may float on the water surface. Such a floating frame may be held in position using for example an anchor and/or spud poles and/or by attaching the floating frame to said land located near the water.

The floating frame may for example comprise at least one floatable body.

In another embodiment of the device according to the invention said floating frame comprises two side legs, wherein said screw is provided between said side legs, wherein said side legs taper outward from said screw in a direction upstream of a stream direction of said water and/or said waste and/or wind.

Said two side legs may provide stability to the device, in particular because of their tapering arrangement. As a result of the two legs tapering outward from said screw in a direction upstream of a stream direction of said water and/or said waste and/or the wind. Said legs define a funnel, such that the waste floating on the water is guided into the direction of the screw located between the two legs.

Said screw may in particular be tilted upwards in the same direction in which the two side legs taper outward.

Said two legs may connect to each other rearwards, i.e. downstream, of the screw, such that the frame is substantially V-shaped, or a lateral frame part may be provided between the two legs rearwards, i.e. downstream, of the screw. An opening may be provided in the frame rearwards, i.e. downstream of the screw, for allowing water to pass.

Said two legs, and optionally said lateral frame part, may be formed by one integral frame element, or may be formed by separate frame elements that are directly or indirectly connected or attached to each other.

The device according to the invention may further comprise any suitable and well known means for making the device function. For example, said device may comprise a drive for rotating said screw. Said drive may be any suitable type of drive, such as an electronic motor and/or a drive driven by water and/or wind power, such as a turbine. Electricity for powering the drive can for example be provided by at least one solar panel, at least one battery, or a cable connecting to an electricity source located on land, such as for example the electrical grid, or in any other suitable way.

Said drive may be arranged for rotating said screw at a chosen and optionally adjustable rotational speed, said rotational speed for example being between 2 — 4 rotations per minute.

The applicant has found that such a rotational speed is an efficient speed for taking up waste, while for example fish have ample time to swim away from the screw and are not taken up thereby.

The device may further for example comprise a said anchor and/or spud poles and/or land attachment means as described above for keeping the device in one location and/or orientation. The device may preferably be arranged at a location where waste accumulates on said water, for example due to the water current or wind. Depending on the water current or wind, the location and/or orientation of the device may be changed by lifting the anchor and/or the spud poles and/or releasing the attachment means, moving the device, and again lowering the anchor and/or spud poles and/or attaching the attachment means.

The invention also relates to the use of a device according to any one or more of the above described embodiments and/or having any one or more of the features described above, in any suitable and/or desired combination, said use comprising the steps of: a} providing a device according to any of claims 1-13; b) arranging the device in or on the water such that a water inlet end of the screw blade extends slightly into the water, at least during a part of the rotation of the screw; c) rotating the screw such that the screw blade takes up water and/or waste and transports said water and/or waste to said waste collecting element.

Advantages and/or further exemplary details of such use are described above with respect to the device according to the invention.

In an embodiment of the use of the device according to the invention a device according to at least claim 4 is provided in step a), and comprising the further steps of: d) removing the waste collecting element from the device; e) emptying and/or cleaning the waste collecting element or changing the waste collecting element for a replacement waste collecting element; f) connecting the waste collecting element or replacement waste collecting element to the device.

Advantages and/or further exemplary details of such use are described above with respect to the device according to the invention. For example emptying the waste collecting element may be performed in any of the described or other suitable ways. Removing the waste collecting element may in particular comprise removing the waste collecting element from the center of the screw. Connecting the (replacement) waste collecting element may in particular comprise arranging the device in the center of the screw.

During performing steps d) — f) step c} may temporarily be stopped.

In an embodiment of the use of the device according to the invention a device according to at least claim 5 is provided in step a}, and comprising the further step of:

g} discharging at least some of the water prior to entering the waste collecting element.

Advantages and/or further exemplary details of such use are described above with respect to the device according to the invention. For example water may be discharged at any of the described locations or at any other suitable location and/or by any of the described means or other suitable means.

In an embodiment of the use of the device according to the invention a device according to at least claim 6 and/or claim 12 is provided in step a), wherein step b) is performed such that said screw is tilted upwards in a direction substantially upstream of a stream direction of said water and/or said waste and/or wind and/or such that said side legs taper outward from said screw in a direction upstream of a stream direction of said water and/or said waste and/or said wind.

In an embodiment of the use of the device according to the invention a device according to at least claim 8 is provided in step a}, wherein prior to step d} the screw is moved from said tilted upward position to said substantially upright position and wherein after step f) the screw is moved from said substantially upright position to said tilted upward position.

In an embodiment of the use of the device according to the invention step c) is performed such that said screw rotates at a rotational speed of 2 — 4 rotations per minute.

Advantages and/or further exemplary details of such use are described above with respect to the device according to the invention. The rotational speed may for example be chosen in accordance with the dimensions of the device and/or the location where the device is arranged.

In an embodiment of the use of the device according to the invention said use comprises the further step of: h) defining a location where waste accumulates on the water, and wherein step b) is performed such that said device is arranged on the water at said location where said waste accumulates.

Step hj) is performed prior to step b) and may be performed prior or after step a). Steps h) and b) may be repeated, for example on a daily basis or at any other desired frequency, such that, for example depending on the water current or wind, the device is at the location where the waste accumulates and thereby most efficiently removes said waste from the water and/or the amount of waste bypassing the device may be limited. This may also comprise a further step of moving the device to a newly defined location. Step c} may temporarily be stopped during moving of the device.

The invention will be further elucidated with reference to figures, wherein:

Figure 1 is a schematic perspective view of a first embodiment of the device according the invention comprising a screw and a waste collecting element; Figure 2 is a schematic longitudinal cross sectional view through the screw of the device of figure 1; Figure 3 is a schematic perspective view of a second embodiment of the device according the invention, and Figure 4 is a schematic perspective longitudinal cross sectional view through a waste collecting element of a second embodiment.

In the figures same features are referred to by same reference numerals, increased by one hundred (100) for further embodiments.

Figure 1 shows a first embodiment of a device 1 for removing waste, such as plastic waste, from a water surface 2 and just below the water surface 2. The device 1 comprises a rotatable screw 3 having a screw blade 4. The rotatable screw 3 is also shown in figure 2, in particular a longitudinal cross section thereof. Said device 1 is arranged on the water in such a manner that an inlet end 5 of the screw blade 4 extends slightly, for example about 30 cm, into the water, at least during a part of the rotation of the screw, such that the inlet end 5 is able to take up waste and water from the water surface 2 and just below the water surface 2. The waste is transported by the screw blade 4to a waste collecting element 6. A part of the screw blade 4 at or near the inlet end 5 is perforated and thus comprises perforations or holes 20, such that some of the water taken up by the screw blade 4 is discharged from the screw blade 4 via the perforated part, and only some water is transported by the screw blade 4 together with the waste, wherein the waste floats on the water and is thus easily transported. In this embodiment the waste collecting element 6 is arranged in the center of said screw 3 and extends substantially parallel to a central longitudinal axis 7 of said screw 3, wherein said screw blade 4 extends around said waste collecting element 6 in a helical manner. The waste collecting element 6 is in this example substantially cylindrical and is open at its upper end, which open upper end is covered by a cover 8 having a waste receiving opening 9. Bearings 10, see figure 2, are provided between the waste collecting element 6 and the screw 3, such that the waste collecting element 6 does not rotate while the screw 3 does rotate. In other words, the screw 3 rotates with respect to the waste collecting element 6. Because said waste collecting element 6 does not rotate, the waste receiving opening 9 remains in a suitable location for receiving waste from an outlet end 11 of the screw blade 4, i.e. a lower part of the cover 8.

As is further shown in figure 1, in this exemplary embodiment the screw 3 is in a tilted upward position, in which tilted upward position said screw is tilted upwards in a direction substantially upstream of a stream direction of said water and/or said waste and/or wind, which stream direction is indicated by arrows 12. In other words, said screw is tilted upwards in a direction substantially opposite to the stream direction 12. The angle 13 between the screw 3, in particular between the central longitudinal axis 7 thereof, and the water surface 2 is in this example 50 degrees.

As is best visible in figure 2, the screw blade 4 is substantially basin shaped as seen in a transverse cross section in a radial direction and comprises an outer edge 14, which outer edge 14 extends substantially parallel to the central longitudinal axis 7 of the screw 3. Said basin shaped screw blade 4, as seen in a radially outward direction, comprises a substantially flat first part 15 and an upwardly inclined second part 16, which each define about 50% of the radial width of the screw blade 4. Said above described perforations 20 provided at or near the inlet end 5 are shown in figure 2 as holes 20. These perforations or holes 20 are in particular provided in said flat first part 15 and said upwardly inclined second part 16. As is further best visible in figure 2, the outer edge 14 also comprises perforations or holes 21, which are provided just below the upper edge of the outer edge

14. This provides the advantage that water may exit the outer edge 14 via the holes 21 and will not flow over the outer edge 14, thereby preventing that waste flows over the outer edge 14. These holes 21 may be provided over substantially the total length of the screw blade 4 as shown in figure 2, but also over only a part of the length of the screw blade 4, for example at or near the inlet end 5 thereof, Figure 2 further shows that the angle 22 between the flat first part 15 and the upwardly inclined second part 16 is about 150 degrees.

The device 1 according to this exemplary embodiment further comprises a floating frame, comprising in this example two side legs 17 and a transverse leg 18. The side legs 17 taper outwards in said stream direction 12 and thereby form a sort of funnel for the waste and/or provide stability to the device 1. The transverse leg 18 connects the two side legs 17, rearwards, i.e. downstream, of the screw 3. Said transverse leg 18 comprises at its lower side a through flow opening or area 23 through which water may flow out of the substantially V-shaped area defined by the floating frame. The through flow opening 23 is defined in this exemplary embodiment by said lower side of the transverse leg 18 extending above the water surface.

The waste collecting element 6, in particular the cover 8 thereof, may be provided with hoisting means, such as in this example a hoisting eye 19, for lifting and thereby removing the waste collecting element 6 from the screw 3 and for reconnecting the same or a replacement waste collecting element 6 to the screw 3.

A drive (not shown in figure 1) is provided for rotating said screw 3 at a chosen and optionally adjustable rotational speed, said rotational speed for example being between 3 — 4 rotations per minute. The drive is for example an electric motor and is for example powered by a solar panel (not shown in figure 1}.

Figure 3 shows a second embodiment of the device 101 according to the invention. Only the differences with respect to the device of figure 1 will be described here. For a further description of the device 101 the reader is referred to the description of figures 1 and 2.

The device 101 differs from the device 1 of figure 1 in that the screw 103 is moveable between said tilted upward position as shown in figure 1 and a substantially upright position as shown in figure 3. The tilted upward position as shown in figure 1 may be the use position for taking up waste and the substantially upright position as shown in figure 3 may be a position in which the waste collecting element 106 can easily be removed from and the same or a replacement waste collecting element 106 can be reconnected to the screw 103, as indicated by arrows 130.

Figure 4 shows a second embodiment of the waste collecting element 206. Only the differences with respect to the waste collecting element 6 and 106 of the first embodiment as shown in figures 1 and 3 will be described here. For a further description of the waste collecting element 206 the reader is referred to the description of figures 1 and 3.

The waste collecting element 206 differs in that it comprises water discharging means 240 for discharging at least some of the water that is transported by the screw blade, for example screw blade 4, 104 of the previous embodiments, together with the waste, such that this water does not enter the waste collecting element 206. The water discharging means 240 of this exemplary embodiment comprise an inclined part 241 which is inclined inwards with respect to the cylindrical wall 242 of the waste collecting element 206 in a downward direction and thereby forms a sort of chute for the waste which may slide on the part 241 into the waste collecting element 206, and which part 241 is perforated such that the water may be discharged via the perforations or holes 245, The part 241 connects to a flange 243 that extends radially inwards from said cylindrical wall 242, such that the part 241, flange 243 and wall 242 together define a sort of water receiving compartment. Near the flange 243, which forms the bottom of the water receiving compartment, holes 244 are provided in the wall 242, such that the water can leave the compartment and thereby the waste receiving element 206.

The waste collecting element 206 can replace the waste collecting element 6, 106 of devices 1, 101 of figures 1 and 3. It is noted that the invention is not limited to the shown embodiments but also extends to variants within the scope of the appended claims.

Claims

Conclusions

Device for removing waste, such as plastic waste, from water, in particular from a water surface or near the water surface, which device comprises: - a rotatable screw, which rotatable screw has a screw blade adapted to transport waste from the water to a waste collection element, and - said waste collection element.

The waste disposal device of claim 1, wherein the waste collection element is disposed in a center of the screw and extends substantially parallel to a central longitudinal axis of the screw, the screw blade extending in a spiral manner about the waste collection element.

A device for removing waste according to any one of the preceding claims, wherein the waste collecting element comprises a cover, which cover comprises a waste receiving opening, the waste receiving opening being provided in a lower part of the cover, at least in use of the device.

A device for removing waste according to any one of the preceding claims, wherein the waste collection element is removably connected to the device.

A device for removing waste according to any one of the preceding claims, comprising water discharge means for discharging water.

A device for removing waste according to any one of the preceding claims, wherein at least in operation of the device the screw is in an oblique upward position, in which oblique upward position the screw extends obliquely upward in a direction substantially upstream of a direction of flow of the water and/or waste and/or wind.

A waste disposal device according to claim 6, wherein an angle between the screw, in particular between one or said central longitudinal axis thereof, and the water surface is between 30 and 45 degrees, preferably between 35 and 40 degrees.

A waste disposal device according to claim 6 or 7, wherein the screw is movable between its oblique upward position and a substantially upright position.

A waste disposal device according to any one of the preceding claims, wherein at least a portion of the propeller blade is substantially cup-shaped as viewed in cross-section in a radial direction and includes an outer edge, the outer edge being substantially parallel to one or the central longitudinal axis of the screw.

The garbage disposal device of claim 9, wherein the cup-shaped screw blade, as viewed in a radially outward direction, comprises a substantially flat first portion and an oblique upward second portion.

A device for removing waste according to any one of the preceding claims, wherein the device comprises a buoyant frame.

A garbage disposal device according to claim 11, wherein the buoyant frame comprises two side legs, the screw being arranged between the side legs, the side legs tapering from the screw in an upstream direction of a flow direction of the water and/or the waste and/or wind.

A device for removing waste according to any one of the preceding claims, comprising a drive for rotating the screw at a selected and optionally adjustable rotational speed, the rotational speed being for instance between 3 - 4 rotations per minute.

Use of a device according to any one of claims 1 - 13, comprising the steps of: a} providing a device according to any one of claims 1 - 13; b) arranging the device on or in the water such that a water inlet end of the propeller blade extends slightly into the water, at least during part of the rotation of the propeller; c} rotating the propeller such that the propeller blade picks up water and/or debris and transports the water and/or debris to the debris collection element.

Use according to claim 14, wherein in step a) an apparatus according to at least claim 4 is provided, and comprising the further steps of: d) removing the waste collecting element from the apparatus; e) emptying and/or cleaning the waste collection element or exchanging the waste collection element for a replacement waste collection element;

f) connecting the waste collection element or the replacement waste collection element to the device.

Use according to claim 14 or 15, wherein in step a} a device according to at least claim 5 is provided, and comprising the further step of: g) discharging at least part of the water prior to entering the waste collection element.

Use according to any one of the preceding claims 14 - 16, wherein in step a) a device according to at least claim 6 and/or claim 12 is provided, wherein step b) is performed such that the screw extends obliquely upwards in a direction in substantially upstream of a direction of flow of the water and/or the waste and/or the wind and/or such that the side legs extend taperingly from the propeller in a direction upstream of a direction of flow of the water and/or the waste and/or the wind.

Use according to any one of the preceding claims 14 - 17 and at least claim 15, wherein in step a) a device according to at least claim 8 is provided, wherein prior to step d} the screw is moved from its oblique upward position to its substantially upright position. position and wherein after step f) the screw is moved from its substantially upright position to its oblique upward position.

Use according to any one of the preceding claims 14-18, wherein step c) is performed such that the screw rotates at a rotational speed of 2-4 rotations per minute.

Use according to any one of the preceding claims 14-19, comprising the further step of: h) defining a location where waste accumulates on the water, and wherein step b) is performed such that the device is arranged on the water on the location where the waste accumulates.