JP2000027147A - Caisson having water treating function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable purification of water passing through a caisson in the case when the water is polluted water. SOLUTION: A space 19 is formed inside a caisson 11. A channel 25 for taking polluted water into the space 19 by a force of waves and aerating it is provided. Gravel 30 for applying purification by inter-gravel contact oxidation to the polluted water introduced into the space 19 are disposed in this space 19. A discharge passage 29 for discharging the water purified by the gravel 30 outside the caisson 11 from the space 19 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a caisson having a water treatment function.

[0002]

2. Description of the Related Art Conventionally, in a port or the like, a closed water area is formed surrounded by a breakwater. In this closed water area, there is a problem that seawater in the harbor is polluted due to poor circulation of seawater and the like. For this,
Attempts have been made to provide water holes in the caisson that constitutes the breakwater. As a result, the water on the outer sea side passes through the caisson and is introduced to the harbor side, and the water is purified inside and outside the harbor, so that the water is purified.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to further improve such prior art so that even if the water passing through the caisson itself is polluted water, it can be purified. .

[0004]

In order to achieve this object, the present invention forms a space in a caisson, and performs the intake of polluted water toward the space by a wave force and the aeration of the polluted water. And a gallery for subjecting the polluted water introduced into this space to intergranular contact oxidation purification, and discharging the water purified by the gallery from the space to the outside of the caisson. Drainage channel is provided.

[0005] With such a configuration, oxygen-rich polluted water aerated by wave force is introduced into the space from the headrace channel, and permeates between the gravel in this space, thereby causing the gravel to flow. Intermediate contact oxidation purification is performed. The purified water is discharged out of the caisson by a drain.

[0006]

1 to 3 show a caisson having a water treatment function according to a first embodiment of the present invention. The caisson 11 has a main body 12 and a lid 13, and the main body 1
2 is installed upward from the seabed 14.
The main body 12 is made of concrete and has a bottom wall 15.
And a front wall 17 facing the waves 16 and a rear wall 18 on the harbor side. A space 19 opening upward is formed between the front wall 17 and the rear wall.
9 is closed by a lid 13 made of concrete. The lid portion 13 is a thick portion 2 that enters the space 19 from above.
0 and a thin portion 21 supported by the upper end of the front wall 17 and the upper end of the rear wall 18 other than the space 19.
In addition, as shown in FIGS. 2 and 3, the front wall 17 and the rear wall 18 are
They are connected to each other by 2, 23. That is, the space 19 is formed in a closed state. The space 19
A wall portion 24 functioning as a rib may be formed between the front wall 17 and the rear wall 18 in the inside. When the wall 24 is formed, the space 19 is divided into a plurality of sections along the horizontal direction.

The front wall 17 is formed with a plurality of horizontally penetrating water-dissipating water holes 25 as water conduits. Each wave-absorbing water-permeable hole 25 is formed, for example, by embedding a wave-breaking pipe made of ductile cast iron inside the front wall 17, and inside the wave-absorbing water-permeable hole 25, there is provided a rapid-shrinking / expanding portion 26 for wave-damping. ing. Further, as shown in the figure, the wave-dissipating water-permeable holes 25 are preferably arranged, for example, in two upper and lower rows corresponding to the ebb and flow of seawater.

A horizontal overflow hole 28 is formed in the upper part of the back wall 18 so as to penetrate therethrough. A plurality of overflow holes 28 are formed along the horizontal direction. Further, in the vicinity of the bottom wall 15 of the caisson 11 on the rear wall 18, a horizontal purified water jet hole 29 as a drainage channel is formed in a penetrating state. It is preferable that the purified water jet holes 29 are arranged in two rows in the upper and lower rows, for example, in a state where a plurality of the purified water jet holes 29 are arranged in the horizontal direction as shown in the figure.

[0009] The space 19 is filled with gravel 30.
The gravel 30 is formed of a lump having a size of about 100 to 300 mm. In the space 19, a gap 31 is formed between the portion filled with the gravel 30 and the lid 13. The purified water jet hole 29 is formed as a round hole, and the purified water jet hole 29 is provided with a fence 32 for preventing the gravel 30 from leaking out.

In such a configuration, the waves 16 from the open sea are introduced into the space 19 through the water-dissipating water-permeable holes in the front wall 17. At this time, if the water forming the waves 16 is polluted water, the waves 16 formed of the polluted water are wave-dissipated when passing through the wave-dissipating water-permeable holes 25 by the wave power,
And aeration is given. At this time, for example, D
Aeration is performed until O is saturated. Then, the oxygen-rich polluted water introduced into the space 19 is permeated between the gravels 30 to be purified by the action of inter-grain contact oxidation purification.

Purified water contains dissolved oxygen (4 p
pm or more is discharged from the orifice 25 toward the seabed closer to the port than the caisson 11. By doing so, purified water containing dissolved oxygen, which can prevent such pollution and oxygen deficiency, is likely to be supplied to the seabed on the port side where the situation is particularly likely to occur. Specifically, if the size of the caisson 11 and the capacity of the wave-dissipating water-permeable holes 25 are appropriately set, for example, polluted seawater having a COD of 10 ppm
Can be purified to about 3 ppm.

Alternatively, oxygen-poor water is generated by the contact oxidation between gravels, and a part of the oxygen-rich water introduced into the space 19 is not allowed to permeate between the gravels 30 so that the gap 3
1 to overflow the port from the overflow hole 28 to the port side, and mix the oxygen-rich overflow water and the oxygen-deficient water from the vent hole 29 in the port to control the purification degree and the oxygen concentration to normal values. Is also good.

Incidentally, it is also possible to adopt a configuration in which the upper portion of the space 19 is opened to the atmosphere without providing the lid 13. In addition, the wave-dissipating water-permeable hole 25 is formed by
Instead of using the wave absorber provided with the above, it is also possible to use an appropriate one. Further, the purified water jet hole 29 is formed at a portion of the front wall 17 below the wave-dissipating water-permeable hole 25, that is, at a portion near the seabed 14, instead of penetrating the back wall 18 and opening to the port side as described above. It may be formed in a penetrating state. With such a configuration, purified water can be returned to the open sea side where polluted water is generated, and the open sea side can be effectively purified.

FIGS. 4 and 5 show a caisson having a water treatment function according to a second embodiment of the present invention. here,
As the purified water ejection hole 29, a vertically long slit is formed in the vertical direction. Other configurations are the same as those in FIGS. In this way, the purified water jet holes 29 are formed by the vertically elongated slits.
Is advantageous in that the gravel 32 can be prevented from slipping out without providing the fence 32, as compared with the case of using round holes as shown in FIGS.

[0015]

As described above, according to the present invention, a space is formed in a caisson, and a water conduit for taking in polluted water toward the space by wave force and aerating the polluted water is provided. Provided, in the space, a gravel for subjecting the polluted water introduced into the space to intergranular contact oxidation purification, and a drainage channel for discharging the water purified by the gravel from the space to the outside of the caisson. Because of this, oxygen-rich polluted water aerated by wave force can be introduced into the space from the headrace, and through this space, water can be passed between the gravel to perform contact oxidation purification between gravel. The purified water can be drained out of the caisson through the drainage channel, so that the caisson can purify the polluted water.

[Brief description of the drawings]

FIG. 1 is a sectional view of a caisson having a water treatment function according to a first embodiment of the present invention.

FIG. 2 is a front view of the caisson of FIG. 1;

FIG. 3 is a rear view of the caisson of FIG. 1;

FIG. 4 is a sectional view of a caisson having a water treatment function according to a second embodiment of the present invention.

FIG. 5 is a rear view of the caisson of FIG. 4;

[Explanation of symbols]

 11 Caisson 19 Space 25 Wave-dissipating water-permeable hole 28 Overflow hole 29 Purified water outlet 30 Gravel

Claims (1)

[Claims] Claims: 1. A space is formed in a caisson, and a water conduit is provided for performing intake of polluted water toward the space by a wave force and aeration to the polluted water.
A gravel for subjecting the polluted water introduced into this space to contact oxidation purification between gravel is arranged, and a drainage channel for discharging water purified by the gravel from the space to the outside of the caisson is provided. Caisson with water treatment function.