KR102237084B1 - Eco-friendly dredger for pollutants sediment of sea bottom - Google Patents

Abstract

The present invention relates to an eco-friendly dredging device.
In the present invention, water jets and microbubbles are sprayed while the collection housing is in close contact with the sea floor to seal the treatment area to disturb and float contaminated surface sediments. The surface sediment floated in the collection housing is sucked by a pump and transferred to the dredging vessel. If the eco-friendly dredging device according to the present invention is used, water and sand components can be minimized, and only contaminated surface sediments can be dredged selectively. Accordingly, the present invention has excellent dredging efficiency, and the post-treatment process is simplified, thereby enabling economical purification treatment. In particular, in the present invention, a movement blocking film is installed in the circumferential direction in the collection housing so as to be elevating and descending, and the movement blocking film is inserted into the cutlery so as to improve the airtightness of the inside of the collection housing.

Description

Eco-Friendly DREDGER FOR POLLUTANTS SEDIMENT OF SEA BOTTOM with improved airtightness {ECO-FRIENDLY DREDGER FOR POLLUTANTS SEDIMENT OF SEA BOTTOM}

The present invention relates to a technology for reducing environmental pollution, and in particular, to an environmental dredging technology for treating by dredging and treating contaminated deposits accumulated on the surface layers of seas, rivers and lakes.

The submarine surface layer, together with the water layer, is a basic element that composes an aquatic ecosystem, providing a habitat for benthic organisms, and is closely connected with the aquatic environment. Accordingly, contamination of the seafloor surface leads to contamination of the water layer, and adversely affects the vegetation of species sensitive to environmental changes.

Contaminated sediments are an important factor in the contamination of the seafloor. Contaminated sediments are formed when domestic sewage, agricultural and livestock sewage, farm waste, and wastewater enter the sea and settle. And as the amount of pollutants introduced and deposited exceeds the self-cleaning capacity of nature, the pollution gradually worsens. In particular, in the case of coasts with semi-closed or closed coastlines such as the south coast of Korea, seawater exchange is not smooth and pollution is rapidly intensifying. In other words, microorganisms in the surface layer decompose coastal sediments (organic matter) while consuming oxygen. However, due to the difference in density between the water layers of seawater, mixing between the layers is not performed, so that oxygen supply is not smooth. Due to the lack of oxygen, the activity of benthic organisms in the sediment decreases, and phosphorus and nitrogen, which are foods for phytoplankton, are produced, resulting in red tide, green algae, blue algae, and hypoxia.

In addition, when organic matter in the sediment is decomposed in an anaerobic state, toxic by-products such as hydrogen sulfide and ammonia are produced, which may limit the number and type of inhabited species in the sediment.

Conventionally, a method of spraying agents such as clay and quicklime has been used to treat contaminated sediments, but clay spraying has a problem in that alumina and silica components in the clay aggregate and precipitate organic suspensions in water. In addition, calcium component of quicklime reacts with sulfate in water to produce limestone and gypsum to cover the sediment, thereby blocking the contact of oxygen from living organisms inside the sediment, causing a lot of damage.

In addition, conventionally, a method of dredging and treating contaminated sediments has been disclosed. Dredging is the most effective method because it removes the contaminated sediment itself, but efficiency and economics are a problem. In other words, when the existing contaminated sediment was dredged, the contaminated sediment in the dredged (solid) was only 1-5%, and uncontaminated sand and gravel accounted for more than 95%, so there was a lot of burden on post-treatment after dredging. Moreover, since the dredged material (solids) is about 10-20% and 80-90% is water, post-treatment is difficult. According to environmental regulations, the sea water cannot be discharged back to the sea immediately after dredging at the site, and must be discharged after satisfying all environmental standards, so there is a problem that the burden of water treatment is greater than the actual treatment of contaminated sediments.

In addition, when the existing dredging equipment was used, contaminated sediments spread during the dredging process, resulting in secondary pollution.

An object of the present invention is to provide a dredging apparatus with improved efficiency and economic efficiency of environmental dredging since it is possible to selectively dredge only contaminated sediments on the surface of a water bottom as to solve the above problems.

Meanwhile, other objects that are not specified of the present invention will be additionally considered within a range that can be easily deduced from the detailed description and effects thereof below.

The dredging apparatus according to an example of the present invention for achieving the above object is mounted on a dredging vessel that dredges surface sediment from the sea, river, and lake, and is supported by hanging on a rope installed on the crane of the dredging vessel. , A collection housing having an open bottom surface to be seated on the spoon surface; A water jet unit installed inside the collection housing and spraying water at a high pressure toward the water bottom to disturb and float surface sediments stabilized on the water bottom in the collection housing; A pump unit installed inside the collection housing to suck surface sediments in the collection housing and transfer them to the dredging vessel; A moving unit for moving the collection housing up and down; And a movement blocking film formed in an annular shape along the circumferential direction of the collection housing and installed to be elevating with respect to the collection housing, wherein the movement blocking film moves downward when the collection housing is seated on the spoon surface when descending. It is characterized in that it is inserted to seal the inside of the collection housing.

In an example of the present invention, the movement barrier film is installed on the outer surface of the collection housing, a cylinder fixed to the inside of the collection housing and having a piston movable in an up-down direction, one end is fixed to the piston, and the other end is the Further provided with a support fixed to the movement blocking film through a long hole formed through one side of the collection housing, the movement blocking film is raised and lowered according to the operation of the cylinder.

In an example of the present invention, the length of the nozzle of the water jet unit is variable. For example, the nozzle is made of an antenna structure in which the length is extendable made up of multi-stage segments.

In an example of the present invention, the water jet unit is rotatable.

In addition, in an example of the present invention, a GPS unit may be further provided that is mounted on the collection housing to determine location information of the collection housing through a communication network.

When the eco-friendly dredging device according to the present invention is used, the amount of solids in the dredged material increases to 50 to 70% and the water decreases to 30 to 50%. In addition, in the present invention, water jet and microbubble are used, and by controlling the pressure of the pump, sand with little contamination potential is not dredged, and only fine particles with very high contamination potential are dredged. As a result, when the eco-friendly dredging device according to the present invention is used, only the contaminated surface sediments are dredged selectively, so the efficiency of dredging is remarkably increased.

By selectively dredging only contaminated surface sediments, the treatment capacity in the post-treatment process is reduced, enabling economical purification treatment.

In addition, the eco-friendly dredging apparatus according to the present invention has the advantage of preventing secondary pollution such as turbidity increase due to disturbance and diffusion of surface sediments, since it dredges in a state where the sea floor is sealed using a collection housing.

On the other hand, even if it is an effect not explicitly mentioned herein, it is added that the effect described in the following specification and its provisional effect expected by the technical features of the present invention are treated as described in the specification of the present invention.

FIG. 1 is for explaining an example in which an eco-friendly dredging device for surface sediments of a cutlery according to an example of the present invention is installed in a dredging vessel (moving barrier is not shown).
2 is a schematic longitudinal cross-sectional view of a main part of the eco-friendly dredging apparatus shown in FIG. 1.
3 is a schematic cross-sectional view of FIG. 2.
4 is a view for explaining the operation of the water jet unit nozzle.
5 is a view for explaining a nozzle arrangement direction of a water jet unit according to another example.
6 is a view for explaining the operation of the eco-friendly dredging device shown in Figure 2, Figure 7 is a view for explaining the operation by increasing the length of the nozzle in the eco-friendly dredging device when the surface layer is thick.
※ The accompanying drawings reveal that they are exemplified by reference for an understanding of the technical idea of the present invention, and the scope of the present invention is not limited thereto.

In describing the present invention, when it is determined that the subject matter of the present invention may be unnecessarily obscured as matters obvious to those skilled in the art with respect to known functions related to the present invention, a detailed description will be omitted.

The present invention relates to an eco-friendly dredging apparatus (hereinafter referred to as'eco-friendly dredging apparatus') for surface sediment of the cutlery. The eco-friendly dredging apparatus according to the present invention mainly aims to purify coastal seabed pollution, but can also be used to treat surface contaminated sediments of rivers or lakes in addition to the sea.

Hereinafter, an eco-friendly dredging apparatus according to an embodiment of the present invention will be described in more detail with reference to the accompanying drawings.

FIG. 1 is for explaining an example in which an eco-friendly dredging device for surface sediments of a cutlery is installed in a dredging vessel according to an example of the present invention.

Referring to FIG. 1, an eco-friendly dredging device 100 according to an example of the present invention is installed in a dredging vessel 200. That is, a crane 210 is provided in the dredging ship 200, and the two-pronged rope 211 is connected to the horizontal lift 212. The tow line 213 is connected to both ends of the horizontal lift 212, and the eco-friendly dredging device 100 according to the present invention is supported by hanging on the tow line 213.

The dredging ship 200 is provided with a treatment system 220 for purifying contaminated surface sediments in situ. For example, a system installed on a purification vessel for treating contaminated soil as disclosed in Prior Patent Nos. 10-1399284 and 10-1647676 developed by the present inventors may be installed.

The eco-friendly dredging device 100 passes through the water layer w and is seated on the water bottom surface. In the contaminated area, surface sediment (s) is piled up on the seabed ground (G) to a certain thickness. If the contaminated surface layer is thin, it is about 20 to 40 cm, but if there are many contaminants such as around the farm, the contaminated surface layer may be 1 m or more.

The contamination patterns of surface sediment (s) vary widely. For example, there may be various pollutants such as sludge, sludge, organic matter, and heavy metals in aquaculture farms. In the case of ports, there is a lot of pollution by heavy metals or household waste, and the vicinity of the farm is contaminated with organic matter.

In the present invention, as for selectively dredging only the surface layer sediment (s) by an eco-friendly dredging device, it will be described with reference to FIGS. 2 and 3.

2 is a schematic longitudinal cross-sectional view of a main part of the eco-friendly dredging apparatus shown in FIG. 1, and FIG. 3 is a schematic cross-sectional view of FIG. 2.

2 and 3, the eco-friendly dredging device 100 includes a collection housing 10, a water jet unit 20, a bubble generating unit 30, a pump unit 40, a moving unit 50, and a moving barrier 60. ).

The collection housing 10 has a shape similar to a hood that absorbs smoke as a whole. That is, the lower part is formed in a circular or square cross section, and the lower surface is open. In addition, the area gradually decreases toward the upper side. When the collection housing 10 is seated on the spoon surface, the interior thereof is designed to be sealed. Of course, gaps may occur depending on the topography of the sea floor, and supplementation for this will be described later.

The water jet unit 20 is for disturbing and floating surface sediments seated on the water bottom sealed by the collection housing 10. The water jet unit 20 includes a water supply pipe 21 installed along the circumferential direction on the inner surface of the collection housing 10. The water supply pipe 21 is connected through a water tank (not shown) and a cable 22 provided in the dredging ship 200. In the water tank, water is pressurized at high pressure through a water jet generator and supplied to the water supply pipe 21. The water supply pipe 21 is provided with a plurality of nozzles 23 at regular distance intervals. The nozzle 23 is disposed downward toward the bottom surface, and high-pressure water is sprayed onto the bottom surface to disturb the surface sediments and float upwards. On the other hand, in a plan view, it may be disposed toward the center point as shown in FIG. 3, and in another example, as shown in FIG. 5, it may be disposed to be inclined in one direction. In the case where the nozzle 23 is arranged as shown in FIG. 5, high-pressure water is sprayed at an angle to generate a rotational flow in one direction within the collection housing 10 as a whole. When the rotational flow is generated in this way, an upward airflow is formed, which facilitates disturbance and floatation of the surface sediment (s).

Meanwhile, in the present invention, the nozzle 23 adopts a shape having a variable length as shown in FIG. 4. When the surface layer (s) is formed thick, it is to extend the length of the nozzle 23 so that high-pressure water can reach the lower part of the surface layer. In the present invention, the length of the nozzle can be extended in various ways. In this example, a multi-stage segmented antenna structure is used. That is, the nozzle 23 consists of a plurality of segments 23a, 23b, and 23c, and the middle segment 23b can be inserted and protruded into the largest segment 23a, and similarly, the end segment is inside the middle segment 23b. (23c) is retractable and protruding. The length of the nozzle can be varied with a multi-stage structure of at least two stages. In order to extend the length of the nozzle, a driving source (not shown) such as a motor has a power transmission structure (not shown), which is a known configuration, and thus a detailed description thereof will be omitted.

In this example, the water jet unit uses a water jet propulsion method used in driving a ship engine, but is not limited thereto, and any configuration capable of disturbing surface sediments by spraying water at high pressure may be applied. In other words, it is added that the meaning of water jet is used as the concept of high-pressure spraying. And'high pressure' refers to a pressure at a level that can disturb and float fine particles, that is, surface sediments smaller than sand (for example, 0.1mm particle size). Alternatively, a pressure range capable of disturbing the sand particles of 0.1 mm or more is possible. Although expressed as high pressure, the pressure range should be such that it can disturb the surface sediment or sand layer and float the surface sediment, but is not specified as a specific pressure range.

The bubble generating unit 30 serves to assist the floating of the surface sediment disturbed by the water jet unit 20 by supplying the microbubbles to the inside of the collection housing 10. The bubble generating unit 30 includes an air supply pipe 31 and a nozzle 33. The air supply pipe 31 is installed along the circumferential direction on the inner surface of the collection housing 10. The air supply pipe 31 is connected through a compressed air generator (not shown) provided in the dredging ship 200 and a cable 32. The compressed air generator pressurizes air at high pressure and supplies it to the air supply pipe 31. The nozzles 33 are installed in the air supply pipe 31 at regular distance intervals. The nozzle 33 sprays micro-bubbles having a size of several tens to several hundred micrometers. Like the water jet unit, the micro bubbles are sprayed in a downward or horizontal direction. The microbubbles adhere to the surface sediment particles and help them float upwards. Therefore, it is possible to increase the effect of microbubbles spraying in the lower or horizontal direction. The air supply pipe 31 is disposed above the water supply pipe 21 so that water and micro bubbles sprayed from the water jet unit act on the surface layer together.

Meanwhile, in another example of the present invention, the water supply pipe 21 and the air supply pipe 31 are configured to rotate in a plane direction. By installing a driving source (not shown) such as a motor and a gear to rotate the water supply pipe 21 and the air supply pipe 31, high-pressure water and microbubbles can form a rotating flow. When a rotational flow is formed, an upward flow can occur as described above, which can promote the rise of surface sediments.

The pump unit 40 is for dredging by suctioning the surface sediment (s) in the collection housing 10. That is, when the surface sediment (s) floats by the water jet unit 20 and the bubble generating unit 30, the pump unit 40 sucks it and transfers it to the dredging ship 200. The pump unit 40 is coupled to an upper side of the collection housing 10, and a transfer pipe 41 interconnects the pump unit 40 and the dredging ship 200. In this embodiment, the pump unit 40 is movable in the vertical direction. In this example, the suction pressure of the pump unit 40 is at a level capable of suctioning sand particles having a particle size of about 0.1 mm. Among the surface sediments, organic matter and oil are lighter than the 0.1mm-sized sand, and heavy metals are also lighter than the 0.1mm-sized sand because of the large number of fine particles. By controlling the pumping pressure in this way, particles heavier than 0.1mm sand are not pumped. In general, particles larger than 0.1mm are mostly sand components, not pollutants, and contaminants are not bound to these particles. Most pollutants are formed of fine particles. Therefore, in order to selectively dredge only contaminant surface sediments, it is desirable to control the pressure of the pump as above. This is because if non-polluting particles such as sand are dredged, only the treatment capacity is increased, but the efficiency of the purification treatment decreases.

In the present invention, the moving unit 50 is for moving the collection housing 10 in the vertical direction, and the power of the crane can be used. However, it is possible to minimize the power of the crane and lift the collection housing 10 through buoyancy. That is, in this embodiment, the buoyancy tank 51 is mounted on the upper side of the collection housing 10. In this example, the buoyancy tank 51 is connected through a dredging ship 200 and a cable 52. The dredging ship 200 is provided with a pump (not shown) capable of injecting and discharging water or air into the buoyancy tank. Since the collection housing 10, the water jet unit 20, the bubble generating unit 30, and the pump unit 40 are made of a steel material, they are lowered by their own weight. However, if the descent speed is too fast, it becomes a problem, so you can adjust the descent speed by filling the buoyancy tank 51 with water. In the case of raising the collection housing 10 upside down, the buoyancy tank 51 may be filled with air. The collecting housing 10 can be raised and lowered by injecting and discharging a regulating fluid such as water or air, which can control buoyancy through the cable 52, into the buoyancy tank 51. When raising and lowering the collection housing 10 through buoyancy, the crane 210 functions only as a support means, but the collection housing 10 may be raised using the power of the crane 21. In this example, a buoyancy tank was used as the moving unit, but various other moving means may be employed.

Meanwhile, in another example of the present invention, a high-pressure spray pipe 70 may be provided that is inserted into the surface layer or the sand layer to spray air and/or water at high pressure. The high-pressure spray pipe 70 is movable in the vertical direction, and the lower end is formed in a sharp shape to facilitate insertion into the surface layer or the sand layer. A plurality of discharge holes 71 are formed in the lower portion of the high-pressure injection pipe 70 to discharge high-pressure water or air. Water and air can also be discharged together. Here,'high pressure' refers to a pressure at a level that can disturb and float fine particles, that is, surface sediments smaller than sand (for example, a particle size of 0.1 mm). Alternatively, a pressure range capable of disturbing the sand particles of 0.1 mm or more is possible. Although expressed as high pressure, the pressure range should be such that it can disturb the surface sediment or sand layer and float the surface sediment, but is not specified as a specific pressure range.

The vertical movement of the high-pressure injection pipe is achieved by a drive source (not shown) such as a motor or cylinder and a power transmission structure (not shown). The driving source and the power transmission structure are very diverse, and since such a structure is a well-known element, a detailed description will be omitted.

If the surface layer is very thick, the nozzle 23 is stretched to respond, but when water (water jet method) or air (air jet method) is injected at high pressure by inserting the high pressure spray pipe 70 into the surface layer (s), the surface layer It is easy to disturb and injure. In addition, if the surface layer is thin, but contaminants are densely interposed between the sand layers (voids) below, the high-pressure spray pipe (70) is inserted into the sand layer below the surface layer and water and/or air is sprayed to discharge the pollutants to the top of the sand layer. Can be.

On the other hand, in the present invention, in order to strengthen the sealing function of the collection housing 10, a movement barrier is installed. The movement blocking film 60 may be installed in contact with the outer or inner surface of the collection housing 10. In addition, in another example, the collection housing 10 may be made of double walls and a movement barrier may be installed between the double walls. In this example, the movement blocking film 60 is installed on the outer surface of the collection housing 10.

Referring to FIG. 2, the movement blocking film 60 is formed to correspond to the outer surface of the collection housing 10 and is movable in the vertical direction. That is, the cylinder 61 is fixed inside the collection housing 10, and the piston 62 of the cylinder is coupled to the support 63. A long hole 15 is formed on one side of the outer surface of the collection housing 10 in the vertical direction so that the support 63 is coupled to the movement barrier 60 through the long hole 15. That is, one side of the support 63 is coupled with the piston 62 and the other side with the movement barrier 60. According to the operation of the cylinder 61, the movement barrier 60 may move in the vertical direction. When the collection housing 10 is seated on the water bottom, the movement barrier 60 is positioned higher than the lower end of the collection housing 10, and when the cylinder 62 is operated, the movement barrier 60 descends and is shown in FIG. It is inserted under the cutlery, as in the enlarged drawing. Since there is a bend in the cutlery surface, a gap may be formed between the collection housing 10 and the cutlery surface, and in this case, the suction function of the pump may be weakened, so that the sealing property is supplemented through the movement blocking film 60.

In this example, the lower portion of the movement barrier 60 is formed in a sharp wedge shape or a shape such as a cogwheel so that it can be easily inserted into the submarine ground. Since the submarine ground is made of sand, and the depth of insertion is also at the level of several tens of cm, a large force is not required for insertion of the movement barrier 60 to the sea floor.

Meanwhile, when the movement blocking film 60 is installed outside the collection housing 10, sealing between the movement blocking film 60 and the collection housing 10 is also required. In this example, the upper portion 65 of the movable barrier 60 is bent to make close contact with the outer surface of the collection housing 10, and a sealing member 67 such as rubber is interposed to enhance airtightness. Even when the movement blocking film 60 descends to the maximum, the bent upper portion 65 does not descend to the long hole 15 of the collection housing 10, so that the sealing can be maintained.

On the other hand, the eco-friendly dredging apparatus 100 configured as described above may be provided with a GPS device and a depth gauge (water pressure gauge). Unlike land, location identification is not easy on the sea, so location information is required in order to accurately perform dredging without missing any of the areas to be treated.

For example, if dredging is performed on an area to be treated using an eco-friendly dredging device, the following procedure is followed. See FIGS. 6 and 7. 6 and 7 are illustrated in a state in which the configuration of the movement barrier is removed for convenience of understanding.

First, the processing target area is divided into a plurality of unit areas, and location information is obtained in each unit area. The dredging device is positioned in each unit area through the GPS device attached to the eco-friendly dredging device 100 and dredging is performed. Through the above method, it is possible to dredge all the areas to be treated. In addition, if the depth information for each unit area is known, the dredging device can be safely descended by acquiring the depth from the depth gauge in real time when the dredging device descends.

When the dredging device is seated on the water bottom, as shown in FIG. 6, the water jet unit and the bubble generating unit are operated to disturb and float the surface sediment, and the pump unit sucks the surface sediment to perform dredging. Water is initially accommodated inside the collection housing, but once the water is pumped, only solids can be selectively pumped, so the quantity of the dredged material can be drastically reduced and the amount of solids can be increased. In the past, the amount of water in dredging was 80-90%, but with this device, water can be reduced to 30-50% and solids can increase to 50-70%.

Moreover, in the present invention, by controlling the pump pressure, sand components with little contamination possibility among solids can be minimized, and only fine particles containing organic matters, heavy metals, and the like can be selectively sucked.

On the other hand, as shown in FIG. 7, if the surface layer is thick, the water jet can be operated in a state in which the length of the nozzle is extended (nozzles are shown in blue on the drawing-length is variable) to promote disturbance and floatation of the surface sediments. .

As a result, the eco-friendly dredging apparatus according to the present invention has the advantage that only contaminated surface sediments can be selectively dredged. By selectively dredging only contaminated sediments, effective and economical purification treatment is possible because treatment capacity is reduced in the post-treatment process.

In addition, since the dredging is performed in the state where the spoon is sealed by the collection housing 10, it is possible to prevent secondary contamination such as increasing turbidity by expanding and dispersing contaminants in the sea area, unlike the existing one.

If the eco-friendly dredging device according to the present invention is used, it is expected to be able to effectively and economically purify contaminated areas such as coasts, ports, and farms.

The scope of protection of the present invention is not limited to the description and expression of the embodiments explicitly described above. In addition, it is added once again that the scope of protection of the present invention may not be limited due to obvious changes or substitutions in the technical field to which the present invention pertains.

100 ... eco-friendly dredging device for surface sediment on the bottom of the water, 200 ... dredging vessel
10 ... collection housing, 20 ... water jet unit, 30 ... air jet unit
40 ... pump unit, 50 ... mobile unit 60 ... movement barrier
70 ... high pressure spray pipe s ... surface sediment w ... water layer

Claims (6)

It is installed on a dredging vessel that dredges the surface sediment of the waterbed from the sea, river, and lake.
A collection housing that is supported by hanging on a rope installed on a crane of a dredging vessel, and has an open lower surface to be seated on the water bottom;
A water jet unit installed inside the collection housing and spraying water at a high pressure toward the water bottom to disturb and float surface sediments stabilized on the water bottom in the collection housing;
A pump unit installed inside the collection housing to suck surface sediments in the collection housing and transfer them to the dredging vessel;
A moving unit for moving the collection housing up and down; And
And a movement blocking membrane formed in an annular shape along the circumferential direction of the collection housing and installed to be elevating and descending with respect to the collection housing, and
In a state in which the collection housing is seated on the cutlery surface, the movement blocking film is inserted under the cutlery surface when descending to seal the inside of the collecting housing,
The movement blocking film is installed on the outer surface of the collection housing,
Further provided with a cylinder fixed to the inside of the collection housing and having a piston movable in an up-down direction, and one end fixed to the piston and the other end fixed to the movement barrier membrane through a long hole formed through one side of the collection housing. So,
Eco-friendly dredging apparatus for surface sediments of cutlery, characterized in that the movement barrier is raised and lowered according to the operation of the cylinder. delete The method of claim 1,
An eco-friendly dredging apparatus for cutlery surface sediment, characterized in that a sealing member is interposed between the movement blocking film and the collection housing so as to prevent water from flowing between the movement blocking film and the collection housing when the movement blocking film is raised or lowered. The method of claim 1,
An eco-friendly dredging apparatus for cutlery surface sediment, characterized in that the nozzle of the water jet unit has a variable length. The method of claim 4,
The nozzle is an eco-friendly dredging apparatus for surface sediment of cutlery, characterized in that the nozzle is made of a multi-stage segmented antenna structure with an extendable length. The method of claim 1,
An eco-friendly dredging apparatus for surface sediment on the surface of the spoon, characterized in that it further comprises a GPS unit mounted on the collection housing to determine location information of the collection housing through a communication network.

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