JPH04244284A - Purification of seawater utilizing air bubble - Google Patents

Abstract

PURPOSE:To efficiently remove the suspended matter in seawater within a short time when ocean engineering works are performed. CONSTITUTION:Seawater containing suspended matter is sucked using a seawater sucking ship to be pressurized by a compressor and the pressurized seawater is again discharged into seawater. This pressurized seawater generates a large amount of air bubbles and the suspended matter in the vicinity of air bubbles is adsorbed by air bubbles to rise to the surface of seawater. Then, the suspended matter is recovered using a dirty water recovery ship while the seawater purified through a filter is returned to the sea and carried to the land to be discharged to a proper place.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] This invention relates to a seawater purification method using air bubbles, and in particular to a seawater purification method that uses air bubbles to generate a large amount of air bubbles in seawater containing pollutants so that the air bubbles adsorb the pollutants. When air bubbles rise near the seawater surface,
This invention relates to a seawater purification method that collects the pollutants.

0002

BACKGROUND OF THE INVENTION As a conventional water pollution prevention technique, one using a pollution prevention membrane is known. This is to surround the area where offshore construction is to be carried out with a sheet (diffusion prevention membrane), allow floating substances to settle naturally within the area, and prevent pollutants from flowing out of the area. As a means for carrying out this method, an apparatus as shown in the attached FIG. 3 is used. In the same figure, area A where offshore construction will be carried out is covered with pollution prevention film 1.
Surrounded by. The upper end of the anti-pollution membrane 1 is attached to floating bodies 2, 2... arranged on the seawater surface L, and the lower end is attached to fixed bodies 3, 3 fixed on the seabed M with wires 4,
4. It is bound using... Thus, the anti-pollution membrane 1 has a certain length (depth) H and is disposed in the sea from the seawater surface L.

0003

[Problems to be Solved by the Invention] In the above-mentioned conventional water pollution prevention method, once the device is set, the next step is to wait for the water pollutants P, P,... to settle using natural forces, and then remove the pollutants P, P,... Since it removes P..., the cost is low, but it takes a long time to remove the pollutants P, P... and is not sufficient.

[0004] Generally speaking, pollutants P, P, etc. are composed of fine particles, and therefore their sedimentation speed is extremely slow, and natural sedimentation alone will not return them to clean water for any length of time. Further, even if the formation of flocs is promoted by the mutual contact of particles on the membrane surface, this alone is not effective as a method for removing the pollutants P, P, . . . . Further, the pollution prevention film 1 cannot remove all the pollutants P, P, . . . from the seawater surface L to the seabed M. That is, the pollution prevention film 1 prevents pollutants P, P... floating between the seawater surface L and the depth H.
However, it is not possible to prevent the pollutants P, P... floating in the lower part of the pollution prevention film 1 from escaping out of the area A. Therefore,
If the pollution prevention film 1 is stretched from the seawater surface L to the seabed M in order to prevent the pollution substances P, P... from escaping outside the area A, the flow of seawater will be obstructed. In reality, this is not possible. Furthermore, since the original purpose of the method for removing the pollutants P, P... by stretching the pollution prevention film 1 is to prevent the pollutants P, P... from flowing out of the area A, There is a defect that pollutants P, P, . . . remain in the area A.

[0005] Therefore, when carrying out marine civil engineering work, a technical problem arises that must be solved in order to remove pollutants from seawater extremely effectively, and the present invention solves this problem. The purpose is to

[0006]

[Means for Solving the Problems] The present invention has been proposed to achieve the above object, and includes a method for inhaling seawater,
After applying pressure to the inhaled seawater, the pressurized water is released into the seawater to generate a large amount of bubbles, and the bubbles generated in the seawater adsorb pollutants and rise near the seawater surface. It is an object of the present invention to provide a seawater purification method using air bubbles, which is characterized in that the pollutants are collected near the surface of the seawater.

[0007]

[Operation] Seawater is sucked in using, for example, a seawater suction vessel equipped with a compressor, and then this seawater is pressurized by the compressor, and the pressurized water is discharged back into the seawater. The released pressurized water is then rapidly decompressed, generating a large amount of bubbles in the seawater. These bubbles adsorb pollutants in the seawater and rise near the seawater surface due to the difference in density with the seawater. Therefore,
For example, a pollution collection vessel or the like is used to collect the pollutants that have risen to the seawater surface together with the seawater, and the seawater is then released as clean water through a filter, etc., and only the pollutants are transported to land and disposed of. .

[0008]

[Embodiment] An embodiment of the present invention will be described below with reference to FIG. 1 of the accompanying drawings.
This will be explained in detail with reference to . L is the seawater surface, and A is the area where marine construction will be carried out. This area A is the floating bodies 10, 10...
surrounded by. Therefore, the pollutants P, P... floating in the area A on the floating bodies 10, 10... are prevented from flowing out of the area A. Further, within the area A, a seawater suction vessel 11 and a polluted water recovery vessel 12 are arranged. The seawater suction vessel 11 is equipped with a compressor 13, which sucks seawater from a seawater suction pipe 14, pressurizes the seawater sucked in by the compressor 13, and discharges the pressurized water into the water from a pressurized water discharge pipe 15. is configured to emit. Further, the pressurized water W discharged from the pressurized water discharge pipe 15 is rapidly depressurized in seawater, so that a large amount of bubbles 16, 16, . . . are generated. Then, as shown in FIG. 2, these bubbles 16, 16... adsorb the floating pollutants P, P..., and the bubbles 16, 16... rise to the vicinity of the seawater surface L due to the density difference with the seawater. It is.

[0009] Therefore, the air bubbles 16, 16... adsorbing the pollutants P, P... and floating therein are sucked through the polluted water suction pipe 17 using a pump or the like disposed in the polluted water recovery vessel 12. , and is separated into seawater and pollutants P, P... through a filter 18 provided in the polluted water recovery vessel 12, and the seawater purified by the filter 18 is discharged into the sea through a discharge pipe 19. The pollutants P, P... are highly concentrated in the filter 18 and efficiently collected, and then transported to land and disposed of at an appropriate location.

[0010] In this way, most of the fine pollutants P, P... floating in the seawater are removed, and the area A becomes clear water in a short time. The invention should not be limited to this invention, and various modifications can be made without departing from the spirit of the invention, and the invention naturally extends to such modifications.

[0011]

Effects of the Invention The present invention, as described in detail in the above embodiment, has the following advantages. (2): Since air bubbles are used, it is clean and no secondary pollution occurs.

■: Since the bubbles disappear immediately after collection, they can be ignored in terms of volume. (2): The work process is simple, so the work can be started or finished at any time as needed. (2): Since the rate of rise of bubbles is much faster than the natural settling rate of pollutants, the present invention can purify water in an extremely short time compared to conventional sedimentation methods.

[0013] ■: Since polluted substances are collected from the site and disposed of at an appropriate location, there is no need to turn them into sludge at the bottom of the water.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, and is a partially longitudinal explanatory diagram thereof.

FIG. 2 is a longitudinal sectional front view showing a state in which pollutants are adsorbed by air bubbles.

FIG. 3 is a partially longitudinal explanatory diagram showing a conventional water pollution prevention method.

[Explanation of symbols]

L Seawater surface A Area 10 Floating body 11 Seawater suction vessel 12 Polluted water recovery ship 16 Air bubbles

Claims (1)

[Claims] 1. After inhaling seawater and applying pressure to the inhaled seawater, the pressurized water is released into the seawater to generate a large amount of bubbles, and furthermore, the bubbles generated in the seawater are pollutants. A seawater purification method using air bubbles, characterized in that when pollutants adsorb and rise near the seawater surface, the pollutants are collected near the seawater surface.