JPH02251213A - Apparatus for cleaning polluted water in water area - Google Patents

Abstract

PURPOSE:To contrive the improvement of operational efficiency by accurately preventing the occurrence of polluted water diffusion in a working water area with a pollution diffusion preventive barrier and cleaning the polluted water within the barrier in the working water area in a short time. CONSTITUTION:A pollution diffusion preventive barrier 5 for preventing the diffusion of the polluted water resulting from underwater operation is anchored in a working area moored to a working ship 1 in such manner as to enclose this water area. An air conduit 9 with its base end in connection with an air compressor 10 provided on the working ship 1 is laid on the inner walls of the barrier 5. The air conduit 9 is provided with a plurality of air bubble releasing nozzles 11 formed at predetermined intervals. Furthermore, a water feed pipe 13 with its base end in connection with a water feed pump 14 provided on the working ship 1 is so arranged as to extend its open end to near the water surface enclosed by the barrier 5. Additionally, a filter mechanism 15 for filtering the polluted water from the water feed pipe 13 is provided on the ship 1. As a result, the operational efficiency can be improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device for purifying polluted water generated in a water body in a short time, for example, by dredging work, earth reclamation work, etc. be.

[Prior Art] For example, when dredging or reclamation work is carried out in a sea area, the seabed is stirred or earth and sand is thrown into the seawater, which pollutes the seawater.

Such seawater pollution caused by underwater civil engineering works is accompanied by environmental destruction. Therefore, it is necessary to prevent the spread of pollution within the sea area.

For this purpose, pollution diffusion prevention devices have conventionally been used.

2 and 3 are schematic side views of a conventional pollution diffusion prevention device. As shown in FIG. When carrying out the work, a work boat 1 is moored to the excavation work area so as to surround the excavation work area, and a diaphragm 5 for preventing pollution diffusion is installed in the excavation work area. 6 is a float attached to the upper end of the diaphragm 5, and 7 is a ballast attached to the lower end of the diaphragm 5. 2 shows a case where the diaphragm 5 is not in contact with the seabed 4, and FIG. 3 shows a case where the diaphragm 5 is in contact with the seabed 4.

[Problems to be Solved by the Invention] According to the above-described device, the diaphragm 5 can prevent the diffusion of polluted water generated by dredging work, earth reclamation work, etc.

However, when removing the diaphragm 5 and moving the work area, the polluted water inside the diaphragm 5 can only be moved after it has been purified by sedimentation. Since this takes a long time, the diaphragm 5 cannot be removed during this time, resulting in a problem of extremely low work efficiency.

Therefore, an object of the present invention is to appropriately prevent the spread of polluted water generated in a working water area, and to purify the polluted water within one working water area in a short time.

An object of the present invention is to provide a device for purifying polluted water in a water area, which can improve work efficiency.

[Means for Solving the Problems] In the present invention, a work boat is moored and installed in a working water area so as to surround the working water area. A pollution diffusion prevention diaphragm was installed around the inner surface of the pollution diffusion prevention diaphragm to prevent the diffusion of contaminated water generated by underwater work. an air conduit whose base end is connected to an air compressor provided on the work boat; a plurality of bubble discharge nozzles provided at predetermined intervals in the air conduit; and the pollution diffusion prevention diaphragm. A water supply pipe whose open end is located near the water surface surrounded by water, the base end of which is connected to a water supply pump installed on the work boat, and pollution from the water supply pipe installed on the work boat. It is characterized in that it consists of a filtration mechanism for filtering water.

Next, the present invention will be explained with reference to the drawings. 1st
The figure is a schematic perspective view showing one embodiment of the device of the present invention. As shown in Fig. 1, when excavating the seabed using the underwater drilling club 3 of the seawater excavator 2 mounted on a work boat 1, the work boat 1 and was moored by line 8. The arrangement of the pollution diffusion prevention diaphragm 5, which has a float 6 attached to its upper end and a ballast 7 attached to its lower end, is the same as in the prior art.

In this invention, an air conduit 9 is attached around the inner surface of the diaphragm 5 at approximately the center in the height direction. The base end of the air conduit 9 is connected to an air compressor 10 installed on the work boat 1. The air conduit 9 is provided with a plurality of bubble discharge nozzles 11 at predetermined intervals in its length direction.

The water supply pipe 13 is arranged so that the open end to which the bell mouth 12 is attached is located near the water surface surrounded by the diaphragm 5. The base end of the water supply pipe 13 is connected to a water supply pump 14 installed in the work boat 1.

The work boat 1 is equipped with a filtration mechanism 15 for filtering polluted water from the water supply pipe 13. 616 is a conduit provided between the water supply pump 14 and the filtration mechanism 15;
17 is a drain pipe for discharging the seawater filtered by the furnace mechanism 15 into the water area within the diaphragm 5.

[Effect] This occurred during one operation in a water area surrounded by the diaphragm 5 for preventing pollution diffusion. In polluted water caused by sediment, etc., pollutants with large particle sizes settle on the seabed, but pollutants with small particle sizes,
Become suspended in water.

Therefore, when a large number of bubbles 18 are released from the air bubble discharge nozzle 11 through the air conduit 9 attached around the inner surface of the diaphragm 5 into the polluted water in the water area surrounded by the diaphragm 5, The pollutants are encapsulated in the released air bubbles 18 and float to the surface of the water.

In this way, the pollutants contained in the air bubbles 18 that have surfaced on the water surface are sucked together with the polluted water through the water supply pipe 13 from the bell mouth 12 disposed near the water surface, and onto the work boat 1. The water is discharged to a filtering mechanism 15 installed at. Then, the filtered clean water is filtered by the 'Fi filtration mechanism 15, and is discharged into the water area within the diaphragm 5 through the drain pipe 17.

Therefore, polluted water in the water area surrounded by the diaphragm 5 can be purified in a short time.

[Effects of the Invention] As described above, according to the present invention, the diffusion of polluted water generated in a working water area is appropriately prevented by the pollution diffusion prevention diaphragm, and furthermore, the polluted water in the working water area within the diaphragm is prevented from spreading. will be cleaned in a short time.

Therefore, the diaphragm 5 can be removed in a short time when moving the work area, and work efficiency is significantly improved.
Many industrially valuable effects result.

1...Work boat, 2...Underwater excavator, 3.
...Undersea drilling club, 4. Seabed, 5. Diaphragm for preventing pollution diffusion, 6. Float, 7. Ballast, 8.
... Cable, 9... Air conduit.

10... Air compressor, 11... Air bubble release no. 12... Bell mouth, 13... Water supply! , 14
... Water supply pump, 15 ... Filtration mechanism, 16.
...Conduit, 17...Drain pipe, 18...
Bubbles.

Claims (1)

[Claims] 1. A diaphragm for preventing the diffusion of pollution, which is moored to a work boat and installed in a work area so as to surround the work area, and is used to prevent the spread of polluted water generated by underwater work; an air conduit attached around the inner surface of the diffusion prevention diaphragm, the base end of which is connected to an air compressor installed in the work boat; and a plurality of air conduits provided at predetermined intervals in the air conduit. a water supply pipe whose opening end is located near the water surface surrounded by the pollution diffusion prevention diaphragm and whose base end is connected to a water supply pump installed in the work boat; A device for purifying polluted water in a body of water, characterized by comprising a filtration mechanism provided on a ship for filtering polluted water from the water supply pipe.