EP0669885B1 - Skim-cleaning jet ski - Google Patents

Abstract

A pollution control device for cleaning up a body of water, in particular near beaches. The device includes a system (1) for skimming off and storing pollutants floating on the water surface. Said device is a jet ski (2), said skimming and storing system (1) includes at least two frames (7) arranged symmetrically on either side of the hull (3) of said jet ski (2), and said jet ski (2) is provided with a lifting device (4) for moving said skimming and storing system (1) between at least two separate positions, i.e. a first pollutant skimming position and a second transport position. Said skimming and storing system (1) is provided with a check valve (5) and said frames (7) are each provided with a curved member forming a false bow (14) in the skimming position.

Description

The invention relates to the field of cleaning water bodies such as in particular, but not exclusively, the water bodies of seaside resorts.

More specifically, the invention relates to techniques for recovering waste floating on the surface of the water or at a shallow depth, and in particular macro-pollutants which are frequently encountered in swimming areas (pieces of plastic , various packaging ....), but also micro-waste. The invention thus finds its application in particular in operations carried out to clean up the coastline, lakes or even port areas.

We know that the seaside resorts, which see their population multiplied during the tourist season, very often have to face the problem inherent in this increase in population and constituted by the appearance and / or the increase in pollution of the plans of water.

Many municipalities are therefore required to clean up these water bodies in order to eliminate their pollution as effectively as possible. This problem is particularly crucial for all seaside towns that want their bodies of water to meet or continue to meet the health criteria laid down by the state, in particular to inform tourists about the quality of coastal water. In addition to the beaches, such cleaning actions are also often necessary in port areas, particularly in marinas, in order to improve the quality of reception for boaters.

The floating pollutants which contaminate the water bodies of the beaches can thus be of very varied nature and size and appear in the form of waste of any kind or even in the form of hydrocarbons. Their accumulation in certain port or coastal areas is frequently reinforced by pleasure craft or commercial traffic, as well as, in some cases, by sea currents.

These pollution problems can also appear on lakes, although generally in a less severe form.

In order to respond to these pollution problems, there is already known in the state of the art an all-metal and unsinkable pollution control vessel, mu by a motor which, via a hydraulic coupler, drives a propeller placed in a longitudinal nozzle. This nozzle makes it possible to propel the ship by sucking the water through two lateral orifices and discharging it towards the rear. A jet deflector acts as a rudder.

During cleaning operations, the two upper sides of the bow move apart by means of hydraulic cylinders, creating an opening 5 meters wide perpendicular to the longitudinal axis of the boat. Thanks to suitable ballasting, this opening of the bow allows water to enter the interior of the boat through a weir, the draft of which has a height of about ten centimeters. The water then enters the nozzle from the front of the boat and the propeller propels it backwards, at a flow rate of approximately 1 cubic meter per second. The advancement of the boat therefore allows pollutants to be drawn towards the weir. Floating trash is thus intercepted by a grid fitted with a lifting device. The grid lifting device, controlled by a hydraulic cylinder, rejects the detritus collected in a removable bucket.

This type of pollution control vessel has many drawbacks. In particular, such a ship includes complex mechanical means making it possible to open its bow in order to allow reception of the waste. These mechanical means allow a wide opening of the two sides of the bow so as to form a spout allowing the water to rush into the interior of the boat and to trap floating detritus on the surface thereof. These means require regular maintenance and have a reliability inversely proportional to their complexity. Such an opening of the bow makes it impossible to operate this vessel as soon as the sea is a little rough or has a swell even modest.

In addition, the size of this type of vessel makes it unusable in intervention areas that are difficult to access or require precise positioning.

Finally, his movement speed is too low to allow him to intervene quickly on several polluted places.

Also known in the prior art, a catcher abatement comprising means for receiving pollutants located between its two hulls and moreover having means for bringing the pollutants to said reception means constituted by at least one ramp of fluid jets disposed in front of the reception means essentially perpendicular to the longitudinal axis of displacement of the catamaran, the jets being able to be used to create a current making it possible to propel the pollutants floating on the surface of the water towards said means for receiving the pollutants. Such a catamaran has been described in French patent application No. 92 10023 in the name of the applicant.

Although such a type of depolluting catamaran has many advantages compared to the vessel described above, and in particular that of being able to move at high speed and in rough seas, it is nonetheless a relatively bulky craft, which can hardly be used in areas to be cleaned that are difficult to access or require precise positioning.

The objective of the present invention is to propose a navigable abatement device which does not have the drawbacks of prior art ships.

In particular, one of the objectives of the present invention is to provide a depollution machine having great maneuverability and which can be brought very quickly to an area to be cleaned.

Another object of the invention is to provide such a machine that can be used by a single person.

Yet another objective of the invention and to provide such a pollution control device requiring no manual intervention on the collected waste.

• une première position de recueil desdits polluants, dans laquelle lesdits moyens de réception et de stockage sont au moins partiellement immergés ;
• une seconde position de transit, dans laquelle lesdits moyens de réception et de stockage desdits polluants sont au moins partiellement relevés hors de l'eau,

   lesdits moyens de réception et de stockage des polluants sont munis d'un clapet anti-retour permettant, en position de recueil, l'entrée des polluants dans lesdits moyens de réception et de stockage lorsque la vitesse dudit scooter est positive ou nulle, et interdisant l'évacuation des polluants desdits moyens des réception et de stockage lorsque la vitesse dudit scooter est négative,
   ledit scooter comprend une fausse étrave canalisant lesdits polluants vers lesdits moyens de réception et de stockage.These various objectives are achieved, according to the invention thanks to a pollution control device intended for cleaning water bodies, in particular near beaches, comprising means for receiving and storing pollutants floating on the surface of the water, characterized in what:
said machine is a sea scooter, said means for receiving and storing pollutants comprising at least two frames arranged symmetrically on either side of the hull of said scooter,
said scooter is fitted with a lifting device enabling said receiving and storage means to be brought into at least two distinct positions:

• a first position for collecting said pollutants, in which said receiving and storage means are at least partially immersed;
• a second transit position, in which said means for receiving and storing said pollutants are at least partially lifted out of the water,

said means for receiving and storing pollutants are provided with a non-return valve allowing, in the collection position, the entry of pollutants in said means for receiving and storing when the speed of said scooter is positive or zero, and prohibiting removing pollutants from said reception and storage means when the speed of said scooter is negative,
said scooter comprises a false bow channeling said pollutants to said receiving and storage means.

The characteristic of using, as a pollution control device, a sea scooter, that is to say a small vessel powered by hydrojet, has multiple advantages. Such a device can intervene quickly. It can collect macro-pollutants even at low speed and has great maneuverability. In addition, it can dock on the beaches, in order to allow the operator to carry out a manual collection of macro-pollutants present on the beaches themselves, in particular when these beaches are of small crack dimensions. Such a device has, moreover, a reduced size allowing it to be taken on board a conventional ship and in particular on board a pollution control ship of the type described previously. It will also be noted that such a device has maximum visibility allowing, where appropriate, the operator to manually reach very large or relatively deeply submerged macro-pollutants. Finally, the very design of this sea scooter guarantees absolute safety vis-à-vis swimmers, in particular thanks to its turbine propulsion.

Thanks to the non-return valves, as soon as the scooter advances, even at very low speed, the entry of macro-pollutants into the reception means provided for this purpose is possible. On the other hand, as soon as the scooter reverses, the exit of the collected waste is prohibited. It is therefore impossible for the recovered and trapped waste in the receiving means are released into the aquatic environment.

The false bow makes it possible in particular to prevent macro-pollutants from getting caught between the hull of the scooter and the pollutant receiving frames.

Also preferably, said means for receiving and storing pollutants are provided with at least one ramp of fluid jets disposed essentially perpendicular to the longitudinal axis of movement of said scooter, said jets being able to be used to create a current making it possible to propel pollutants floating on the surface of the water towards said receiving and storage means. These jets also prevent the return of macro-pollutants in the aquatic environment, when the speed of the scooter is zero.

• lorsqu'il avance, les polluants sont naturellement dirigés vers les moyens de réception situés de part et d'autre de la coque dudit scooter ; la rampe de jets de fluide n'a, dans ce cas, pas à être mise en oeuvre.
• lorsque le scooter est à l'arrêt, la rampe de jets de fluide est utilisée pour permettre la formation d'un courant se substituant au courant créé par le déplacement et permettant l'acheminement des déchets vers les moyens de réception prévus à cet effet.

The pollution control device according to the invention can therefore have two operating modes:

• when it advances, the pollutants are naturally directed towards the receiving means located on either side of the hull of said scooter; the fluid jet ramp does not have to be implemented in this case.
• when the scooter is stopped, the ramp of fluid jets is used to allow the formation of a current replacing the current created by the movement and allowing the routing of waste to the receiving means provided for this purpose.

The use of jets of fluids, also known under the English term of "jetting" thus allows the scooters scooter to operate in the most remote areas of water bodies and thus rid them of their pollutants.

Advantageously, said lifting device has means making it possible, in the transit position, to retract said means for receiving and storing pollutants along the hull of said scooter. In this way, the scooter has a small footprint and can be brought into areas of difficult access. In addition, such a "retraction" of the pollutant collection means makes it possible to maintain the hydrodynamics and the stability of the scooter and thereby its ability to intervene quickly.

Also advantageously, the machine comprises on the one hand dodging means allowing, in the collection position, said means for receiving and storing pollutants to retract in the event of a collision with an obstacle, and on the other hand means reminder allowing said means for receiving and storing pollutants to return to the collection position, once the obstacle has been avoided. Such means of dodging and recalling prove to be particularly useful when using the scooter according to the invention in aquatic areas having many rocks and other types of frequent obstacles such as poles delimiting the parks to Oysters.

According to a variant of the invention, each of said frames being provided with a pollutant recovery net. The use of such nets has the advantage of offering great flexibility of use. In particular, these nets fold easily against the scooter in the transit position and can even be brought back to the scooter in the event of light loading.

Also according to a variant of the invention, said lifting device includes a horizontal rotary axis connecting together said frames installed on either side of the hull of said scooter, said horizontal rotary axis allowing said lifting device to bring said means for receiving and storing pollutants in said first pollutant collection position and in said second transit position. Such a horizontal axis can thus be installed in particular at the front part of the scooter, essentially transversely to the direction of movement of the latter, so as to support the distribution of the means for receiving and storing macro-pollutants on each side from the hull of the scooter.

Preferably, each of said frames is secured to said horizontal rotary axis by a lateral folding axis allowing said frame to be retracted against the hull of said scooter, when said receiving and storage means are in the transit position.

Also preferably, said dodging means mentioned above consist firstly of a vertical dodging axis connecting each of said frames to said rotary horizontal axis, and said return means are constituted by a spring returning said retracted frames to the collection position.

According to a variant of the invention, said fluid jets are inclined relative to the vertical so as to facilitate the creation of the current making it possible to propel said pollutants towards said receiving and storage means.

Advantageously, means making it possible to vary the inclination and / or the force of said jets of fluid are provided. Thus, it is possible to create a more or less strong current directed towards the reception means and making it possible to cause floating pollution towards them.

It will be noted that depending on the force of the jets of fluid dispensed by the ramps, it will be possible to recover the pollution floating on the surface of the water but also that located slightly below the surface of the water.

In a particularly interesting way, the fluid distributed by the jetting ramp is chosen from the group consisting of water, air and dispersing products. The use of dispersing products makes it possible to recover the floating pollution constituted by hydrocarbons. The scooter according to the invention can therefore also be used in ports or in areas in which ships have degassed.

Although it is possible to envisage providing the lifting device with electrically controlled maneuvering means, said device according to the invention is preferably provided with at least one handle secured to said rotary horizontal axis making it possible to place said device alternately in said position. collection and in said transit position.

According to a variant of the invention, the scooter used has modifications to the fairing or to the structure aimed at improving the ergonomics of the cockpit, in particular with regard to protection against spray and the comfort of the seat. Such modifications may consist of replacing the saddle with a more comfortable seat or raising the freeboards.

Preferably, said frames are each provided with a curved piece, said curved pieces forming, in the collection position, said false bow.

The invention relates not only to the depollution scooter described here, but also to the lifting device as such designed for the production thereof. Such a lifting device can be used for another type of navigable device than a sea scooter.

When using the depollution scooter, the pollutants are transported to the receiving means, preferably comprising nets. When these nets are full, the means for receiving pollutants can be lifted out of the water and brought back against the hull of the scooter. The contents of the nets can then be brought to the quay and discharged to a waste treatment plant.

• la figure 1 représente une vue de côté d'un engin dépollueur selon l'invention ;
• la figure 2 représente une vue de haut de l'engin représenté à la figure 1, les moyens de réception et de stockage de celui-ci étant en position de transit à tribord et en position de recueil à bâbord ;
• la figure 3 représente une vue de face des moyens de réception et de stockage des polluants équipant l'engin représenté aux figures 1 et 2 ;
• la figure 4 représente en détail, le dispositif de relevage des moyens de réception et de stockage des polluants dudit engin.

The invention as well as the various advantages which it presents will be more easily understood thanks to the nonlimiting example of embodiment which will follow with reference to the drawings in which:

• Figure 1 shows a side view of a pollution control device according to the invention;
• 2 shows a top view of the machine shown in Figure 1, the means for receiving and storing it being in the transit position to starboard and in the collection position to port;
• 3 shows a front view of the means for receiving and storing the pollutants fitted to the vehicle shown in Figures 1 and 2;
• FIG. 4 shows in detail, the device for lifting the means for receiving and storing pollutants of said machine.

According to Figure 1, the depollution vessel of the invention is in the form of a scooter 2 and can be used to clean water bodies, such as in particular the water bodies of seaside resorts and more particularly beaches , in order to rid them of their surface pollution in the form of various objects.

This scooter has a length of about 3 meters, a width of about 1.5 meters and a very shallow draft allowing it in particular to dock on the beaches. Its transit speed of around 10 knots makes it likely to travel from one pollution point to another without wasting time. Its propulsion by turbine allows it to evolve safely even in bathing areas.

According to the invention, this scooter 2 is equipped with means enabling it to collect floating waste on the surface of the water and more particularly macro-pollutants in the form of various objects, such as bottles, plastic materials. , etc. These means are constituted on the one hand by means of reception and storage 1 of the pollutants installed on either side of the shell 3 of the scooter 2 and on the other hand of a lifting device 4 of these reception means and storage 1. The lifting device 4 can be easily manipulated by the operator driving the scooter using handles 16 in order to alternately pass the reception and storage means 1 into a collection position in which these are deployed so as to be at least partially submerged and in a transit position in which the means of recovery and storage 1 of the pollutants are raised out of the water.

In the context of the present exemplary embodiment of the invention, the means for receiving the storage 1 of the pollutants are constituted by two frames 7 provided with nets 8. The frames 7 have a sufficient dimension so as to show a part submerged at about 50 cm in collection position. Thus, not only the floating pollution but also that partially submerged can they be recovered in the nets 8. These nets 8 also have the advantage of constituting a light structure which can float according to the currents while trapping macro-pollutants.

The sea scooter thus equipped constitutes a pollution control device of very great maneuverability which can have a very high intervention speed compared to conventional pollution control vessels. In addition, its structure allows it to access areas normally prohibited for depolluting vessels of the state of the art because of their large size, such as bodies of water in very narrow coves or maritime areas with rocks. or reefs.

As noted above, such a scooter has a very wide scope of intervention since it can even dock on beaches. The operator responsible for cleaning can thus complete its action manually on the beaches themselves.

Referring to Figure 2, the two distinct positions of the receiving and storing means 1 of the pollutants are shown. As can be seen in this figure, these reception and storage means 1 each consist of a metal frame 7 having two compartments 7a, 7b each connected to a net 8. According to this figure, the reception and storage means 1 of the pollution control device are shown in the port collection position and in the starboard transit position. Note however that, according to the embodiment described here, the reception and storage means 1 located on port and starboard are necessarily in the same position, collection or transit. However, according to other embodiments, means may be provided for placing the reception and storage means in a position to port independent of their position to starboard.

According to FIG. 2, when the means for receiving and storing pollutants 1 are deployed, the frames 7 are oriented so that the compartments 7a and 7b receive the macro-pollutants at a speed equal to the speed of movement of the scooter . These macro-pollutants are stored in the nets 8. In the transit position, the frames 7 to port and to starboard are brought against the hull 3 of the scooter 2 thanks to the lifting means actuated with the handles 16. When the receiving means and storage 1 of the pollutants are in the transit position, the nets 8 can be brought back to the scooter. To this end, ropes 17 can be connected to the frames 7 so as to bring the recovery and storage means 1 against the shell 3.

The lifting device comprises a rotary horizontal axis 9 provided with two uprights 18 at the end of which are fixed handles 16. By action on the handles 16, the axis 9 connecting the frame 7, located on the port side, to the frame 7 located to starboard can be rotated to bring these frames out of the water. Once the frames are brought out of the water, the ropes 18 can be maneuvered to bring the storage and reception means 1 into the transit position. When the reception and storage means 1 are in the transit position, the scooter has hydrodynamics and stability allowing it to move quickly and in particular to weave between obstacles. Thus, the field of action of such a pollution control device is very wide.

With reference to FIG. 3, the means for receiving and storing the pollutants are shown in front view (left part of FIG. 3) and in rear view (right part of FIG. 3).

According to the invention, these receiving and storage means have a frame 7 (and a net, not shown). The frame 7 has an essentially quadrangular section and a length of less than one meter. Thus, when the means for storing and receiving pollutants from the scooter 2 according to the invention are deployed in the collection position, the scope of the machine is of the order of 3 meters.

In the collection position, the frame 7 is immersed up to the dotted line 19 representing the water level of the zone to be decontaminated.

A non-return valve 5 is mounted inside the frame 7 so as to allow the introduction of pollutants into the frame 7 towards the recovery nets 8, when the speed of the scooter is positive or zero. This non-return valve prevents the evacuation of pollutants trapped in the nets 8 when the speed of the scooter 2 is negative, that is to say when it reverses. According to FIG. 3, the non-return valve 5 of the frame 7 is shown in the closed position, so as to prevent the recovered macropollutants from being released. A net, not shown, fixed between the lower part of the non-return valve 5 and the bottom of the frame 7 prevents recovered pollutants from being released when the non-return valve 5 is in the closed position. This net folds behind a grid 20 located at the front of the frame 7 when the non-return valve 5 is in the open position.

The frame 7 is moreover provided in its upper part with a jetting ramp 6 allowing the formation of several water jets 15. The jets 15 make it possible to create a current of water replacing the current caused by the movement of the scooter 2 when the speed thereof is zero. This artificial current on the one hand prevents the exit of macro-pollutants recovered from the nets 8 while promoting the routing of macro-pollutants to the nets 8, when the scooter is at a standstill. The depollution scooter can therefore be used when it is moving, but also in areas where such movement is not possible.

At the front of the frame 7, a grid 20 is provided to protect the non-return valve 5 against possible shocks when the latter is in the open position. Advantageously, the net fixed between the lower part of the non-return valve 5 and the bottom of the frame 7 folds back behind the grid 20 to prevent pollutants from accumulating in this net and prevent the non-return valve 5 from s' fully open.

According to Figure 4, the lifting means 4 of the pollutant recovery and storage means 1 are shown in perspective. This lifting device can be secured to the scooter 2 by means of fixing flanges 21. Such a lifting device has a symmetrical arrangement around a rotary horizontal axis 9 connecting together, by means of two lateral folding axes 10 , the frames 7 of the storage and recovery means 1 of the pollutants. Amounts 18 at the end of which are placed handles 16 allow the frames 7 to pass from a collection position, in which they are partially immersed, into a transit position in which they are placed out of the water.

Each of the frames 7 is provided with a dodging axis 11 and return means in the form of a spring 12 allowing it to fold back temporarily in the event of encountering an obstacle and then to return to the collection position as soon as this obstacle has been avoided.

Furthermore, each of the frames 7 has a curved piece 13. The two curved pieces 13 of each frame 7 form a false bow 14 when the lifting device is operated to place the means for receiving and storing 1 the pollutants in the collecting position. . Thus, this false bow 14 makes it possible to channel the pollutants encountered by the scooter during its movement towards the reception and storage means 1.

Such a lifting device has many advantages. In particular, it can be very easily handled thanks to the handles 16, by the one and only operator who drives the scooter. In addition, it has a reduced overall size which does not increase the dimensions of the scooter too much when the means for storing and recovering pollutants are placed in the transit position. Finally, it allows, thanks to its false bow to marry the bow of the scooter and thus promote the evacuation of pollutants to the receiving means.

It will be understood that such a type of lifting device can be installed on other types of navigational equipment than a scooter, for the purpose of cleaning up water bodies.

The example of embodiment described here is not intended to limit the scope of the invention. In particular, it could be envisaged to use means for receiving and storing macro-pollutants having a shape different from that of the frames and nets described. It may also be envisaged to provide means making it possible to maneuver independently the reception and storage means located on the port and starboard sides of the scooter.

Claims (15)

1. Machine for removing pollution intended to cleanse stretches of water, in particular close to beaches, comprising means (1) for trapping and storing pollutants floating on the surface of the water, characterized in that :
      the said machine is a jet ski (2), the said means (1) for trapping and storing pollutants comprising at least two frames (7) arranged symmetrically either side of the hull (3) of the said jet ski (2),
      the said jet ski (2) is provided with a lifting device (4) enabling the said means (1) for trapping and storage to be brought to at least two distinct positions :

   - a first position for collecting the said pollutants, in which the said means (1) for trapping and storage are at least partially submerged ;

   - a second transit position, in which the said means (1) for trapping and storing the said pollutants are at least partially lifted out of the water,
      the said means (1) for trapping and storing pollutants are provided with a non-return flap valve (5) allowing, in the collecting position, pollutants to enter the said means (1) for trapping and storing pollutants when the velocity of the said jet ski (2) is positive or zero, removal of the said pollutants from the said means (1) for trapping and storage being prevented when the velocity of the said jet ski (2) is negative,
      the said jet ski has a false bow (14) channelling the said pollutants towards the said means (1) for trapping and storage.
2. Machine for removing pollution according to claim 1, characterized in that the said means (1) for trapping and storing pollutants are provided with at least one bank (6) of fluid jets (15) disposed essentially perpendicular to the longitudinal axis of movement of the said jet ski (2), it being possible to use the said jets to create a current enabling pollutants floating on the surface of the water to be propelled towards the said means (1) for trapping and storage.
3. Machine for removing pollution according to either of claims 1 or 2, characterized in that the said lifting device (4) has means enabling, in the transit position, the said means (1) for trapping and storing pollutants to be retracted along the hull (3) of the said jet ski.
4. Machine for removing pollution according to one of claims 1 to 3, characterized in that it comprises on the one hand means of retraction enabling, in the collecting position, the said means (1) for trapping and storing pollutants to be retracted in the event of collision with an obstacle, and on the other hand means of return enabling the said means (1) for trapping and storing pollutants to return to the collecting position, once the obstacle has been avoided.
5. Machine for removing pollution according to one of claims 1 to 4, characterized in that each of the said frames (7) is provided with a net (8) for recovering pollutants.
6. Machine for removing pollution according to one of claims 1 to 5, characterized in that the said lifting device includes a horizontal rotating shaft (9) connecting the said frames (7) installed either side of the hull (3) of the said jet ski (2) to each other, the said horizontal rotating shaft (9) enabling the said lifting device (4) to bring the said means (1) for trapping and storing pollutants into the said first position for collecting pollutants and the said second transit position.
7. Machine for removing pollution according to claim 6, characterized in that the said frames (7) are firmly attached to the said horizontal rotating shaft (9) by a lateral folding shaft (10) allowing the said frame (7) to be retracted against the hull (3) of the said jet ski (2), when the said means (1) for trapping and storage are in the transit position.
8. Machine for removing pollution according to one of claims 4 to 7, characterized in that the said means of retraction consists on the one hand of a vertical retracting shaft (11) connecting each of the said frames (7) to the said horizontal rotating shaft (9), and in that the said means of return consists of a spring (12) bringing the said retracted frames (7) into the collecting position.
9. Machine for removing pollution according to one of claims 3 to 8, characterized in that the said fluid jets (15) are inclined relative to the vertical so as to facilitate the creation of a current enabling the said pollutants to be propelled towards the said means for trapping and storage (1).
10. Machine for removing pollution according to one of claims 3 to 9, characterized in that it is provided with means enabling the inclination and/or the force of the said fluid jets (15) to be varied.
11. Machine for removing pollution according to one of claims 3 to 10, characterized in that the said fluid is selected from the group consisting of water, air and dispersant products.
12. Machine for removing pollution according to one of claims 6 to 11, characterized in that the said lifting device (4) comprises at least one handle (16) firmly attached to the said horizontal rotating shaft (9) enabling the said device (4) to be placed in the said collecting position and the said transit position.
13. Machine for removing pollution according to one of claims 1 to 12, characterized in that the said jet ski (2) has structural modifications selected from the group consisting of raising freeboards and replacing the saddle with a more comfortable seat.
14. Machine for removing pollution according to one of claims 1 to 13, characterized in that the said frames (7) are each provided with a curved part (13), the said curved parts (13) forming, in the collecting position, the said false bow (14).
15. Lifting device for the construction of a machine for removing pollution according to one of claims 1 to 14 characterized in that it has means for bringing the said means (1) for trapping and storage into at least two distinct positions :

    - a first position for collecting the said pollutants, in which the said means (1) for trapping and storage are at least partially submerged ;

    - a second transit position, in which the said means (1) for trapping and storing pollutants are at least partially lifted out of the water,
       the said means (1) for trapping and storage are provided with a non-return flap valve (5) allowing, in the collecting position, pollutants to enter the said means (1) for trapping and storage when the velocity of the said jet ski (2) is positive or zero, removal of the said pollutants from the said means (1) of collection and storage being prevented when the velocity of the said jet ski is negative.

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