JP2510941B2 - Water quality improvement system using long-period wave energy - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a water quality improvement system utilizing long-period wave energy,
More specifically, the present invention relates to a system for improving water quality in an inner bay area that is a closed water area in shape by using long-period wave energy.

[0002]

2. Description of the Related Art Recently, as the demand for the use of coastal waters has increased, the purification of the inner bay must be regarded as the most basic problem.

By the way, since the exchange of seawater is not sufficient in the inner bay where the water is closed due to topographical relations, the amount of suspended oxygen increases and the amount of dissolved oxygen decreases due to sediment such as sludge. As a result, the self-cleaning capacity has become extremely low, and thus improving the water quality in such inner bay areas has become an important issue in terms of environmental improvement.

Therefore, as means for improving water quality in such a closed inner bay water area, for example, suspended impurities are appropriately collected and removed, and sediment such as sludge is dredged and removed, or is injected from the sea. Various measures have been taken, such as covering with sand cover and securing seawater inflow routes outside the bay so that seawater exchange can occur as much as possible.

However, all of these methods are expensive, and although sediments such as suspended impurities and sludge are temporarily removed, they are secondary measures, so the water quality of the inner bay area itself is maintained for a long period of time. It was difficult to improve or maintain it.

On the other hand, a wave pump that uses short-period wave energy such as wind waves as a drive source is used to omit the power cost, pump the bottom layer water of the water area to exchange seawater, and resonate with the wave force. A system that improves the water quality by aerating the compressed air obtained by the mechanism into the water has also been proposed, but the energy of short-period waves such as wind waves is rapidly attenuated, so the drive source However, the water quality could not be satisfactorily improved because the efficiency was extremely poor and there was contamination due to suspended impurities.

[0007]

Therefore, in the present invention, attention is paid to the energy of long-period waves having a wavelength longer than that of wind waves, for example, a resonance phenomenon (sub-vibration) of sea surface vibration found in the inner bay area and sea surface vibration due to tidal waves. However, a rectangular outer shell that resonates with the water level fluctuation of several tens of seconds of these long-period waves and is formed in a rectangular shape is arranged in the inner bay area that is a closed water area in shape. A plurality of openings are formed, and the inflow coefficients of these openings are made different so that seawater is discharged only from a predetermined opening, while the corners of the outer shell are formed inside the outer shell. An air compression mechanism was set up so as to resonate with the water level fluctuation due to the generated overlapping waves, and the compressed air obtained by this air compression mechanism was connected to a diffuser pipe arranged on the seabed via a constant pressure storage tank, and Time for floating impurities in the opening By disposing the filter,
By using the external force of nature (energy of long-period waves) efficiently, the water quality in the inner bay is improved and the pollution due to floating impurities is also prevented.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In the water quality improvement system according to the present invention, a long-period water level fluctuation occurring in an inner bay area which is a closed water area in shape is utilized by utilizing a resonance phenomenon in a corner portion in a rectangular outer shell. Amplify and amplify the amplified water level fluctuation to the vertical vibration (reciprocating motion) of the piston member due to the resonance phenomenon with the piston member of the air compression mechanism to efficiently compress and store the outside air and also to diffuse this compressed air The water quality is improved by increasing the amount of dissolved oxygen and improving the self-cleaning ability by aeration action during the emission. On the other hand, impurities and the like floating in the outer shell are collected by a filter disposed in the opening riding on the one-way flow caused by the difference in the inflow coefficient.

[0009]

The preferred embodiments of the water quality improving system according to the present invention will be described in detail below with reference to the accompanying drawings.

1 and 2, the water quality improvement system 10 according to the present invention is arranged in an inner bay area which is a closed water area in shape. And this water quality improvement system 1
0 includes, for example, an outer shell 16 that surrounds a predetermined portion of the inner bay water area in a rectangular shape by using a sheet pile or the like, and is dimensioned so that the surrounded water area resonates by a water level fluctuation of a cycle of several tens of seconds. Two openings 12, 14 are formed in the rectangular outer shell 16. By forming the outer shell 16 in this manner, the vicinity of the corner portion in the outer shell 16 is formed as shown in FIG.
As described above, since the waves in the two directions of the vertical direction and the horizontal direction are overlapped to form antinodes and resonate, the water level fluctuation is the largest. In this case, the outer shell is, for example,
Even if it is formed in a circular shape, resonance of overlapping waves will occur, but since there is no overlapping of waves, the water level fluctuation will be small. The antinodes of the wave are overlapped at the corners and the water level fluctuations act synergistically to be the largest. Therefore, it is optimal to set the shape of the outer shell to a rectangular shape as in this embodiment.

A plurality of air compression mechanisms 18 are provided at the corners and side edges of the outer body 16 where the water level fluctuation is greatest, and the compressed air constant pressures of these air compression mechanisms 18 and predetermined locations are set. Storage tank 20 and air pipe 22
Connected by this compressed air constant pressure storage tank 2
The air supply pipe 24 derived from 0 is communicated with the air diffuser pipe 26. The air diffusing tube 26 is formed by a conventionally known tube body having a large number of small holes formed along its longitudinal direction, and these air diffusing tubes 26 are fixed to the seabed inside the outer shell 16 by appropriate means.

Each air compression mechanism 18 is composed of an air compression cylinder 28 installed in the sea, and an outside air intake 32 provided with a check valve 30 is opened in a part of the air compression cylinder 28 and is formed by a floating body. Piston member 3
The reciprocating motion of 4 compresses the outside air taken into the cylinder 28. In this case, the piston member 34
The natural period of the vertical movement (heaving) of (1) is set so as to match the resonance period of the internal water of the outer shell 16.

Further, the outer shell 16 stores a seawater in the outer shell 16 through the opening 12 at the time of rising tide and discharges the seawater to the outside from the opening 14 due to the water level difference with the surrounding sea area at the time of low tide. It is formed as a bank, and the opening 12 and the opening 14 are set in a shape such that there is a difference in the inflow coefficient between the forward flow and the backward flow, and when the seawater in the outer shell 16 is replaced by the tidal tide and its replacement is performed. It is configured so that the flow direction of is constant. A filter 36 for collecting impurities floating in the flow is provided in each of the openings 12 and 14.

In the water quality improvement system 11 according to the present invention having such a configuration, seawater is made to flow from the opening 12 into the outer shell 16 by utilizing the fluctuation of the water level due to the tide. At this time, the floating impurities in the surrounding water area are removed by the filter 36.

When a long-period wave having a period of several tens of seconds strikes, the water level in the outer shell 16 which is set to resonate in this period largely fluctuates due to the resonance phenomenon and is superimposed. The overlapping wave maximizes the water level fluctuation near the corner.

The water level fluctuation most amplified in the vicinity of the corner of the outer shell 16 is converted into reciprocating motion of the piston member 34 in the air compression cylinder 28, and enters the air compression cylinder 28 through the outside air intake port 32. Used as energy to compress the introduced air. In this case, the natural period of vertical movement (heaving) of the piston member 34 and the outer shell 1
Since the resonance cycle of the internal water of 6 is matched, the reciprocating movement of the piston member 34 is further amplified and the outside air introduced into the air compression cylinder 28 can be suitably compressed.

The outside air compressed by each air compression mechanism 18 is sent to a compressed air constant pressure storage tank 20 via an air supply pipe 22, and this compressed air constant pressure storage tank 20 is further supplied.
When the pressure reaches a certain level, it is diffused into the seawater as air bubbles through the air supply pipe 24 and each diffuser pipe 26, and the amount of dissolved oxygen is increased by the aeration action at the time of diffusion to improve the water quality by improving the self-cleaning ability. Done.

On the other hand, since the outer shell 16 is formed as a gusset-type levee, for example, during low tide, seawater is discharged from the opening 14 due to the water level difference with the surrounding sea area, and the seawater in the outer shell 16 is replaced. Not only is the opening 1
The filter 36 arranged at No. 4 adsorbs the floating impurities in the outer shell 16 and then releases the seawater. Moreover, since the flow direction of the seawater is also constant, the floating impurities do not become turbid in the shell 16.

Although the floating impurities adsorbed on the filter 36 are removed as appropriate, this water quality improvement system 10 uses a naturally occurring external force called long-period wave energy as a power source, so that running costs are reduced. It can be reduced and maintenance can be performed very easily.

[0020]

As described above, in the water quality improvement system according to the present invention, the fluctuation of the sea level in the rectangular outer shell is amplified by utilizing the fluctuation of the sea water level caused by the energy of the long-period waves, and this is also amplified. The water level vibration and the air compression mechanism are resonated to efficiently compress the air, and further the compressed air is diffused into the outer body water area for aeration, and this aeration increases the amount of dissolved oxygen and promotes the improvement of water quality. Since it is held, not only the power cost is unnecessary, but also maintenance is extremely easy. In addition, impurities floating in seawater are also reliably recovered using a filter placed in the Guchi type opening by utilizing the flow in a certain direction, so that it is possible to achieve efficient water quality improvement. Is to have.

The preferred embodiment of the water quality improving system according to the present invention has been described above. However, the present invention is not limited to this embodiment, and various designs can be made within the scope not departing from the spirit of the present invention. Of course, changes can be made.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a water quality improvement system according to the present invention.

FIG. 2 is a cross-sectional explanatory view of essential parts of the water quality improvement system shown in FIG.

[Explanation of symbols]

10 Water Quality Improvement System, 12 Openings, 14
Opening part, 16 outer shell, 18 air compression mechanism, 20 compressed air constant pressure storage tank, 22
Air pipe, 24 Air pipe, 26 Air diffuser, 28
Air compression cylinder, 30 Check valve, 32 Outside air intake, 34
Piston member, 36 filter.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-3-98696 (JP, A) JP-A-57-5567 (JP, A) Actually-opened Shou 61-108888 (JP, U)

Claims (1)

(57) [Claims] 1. A system for improving water quality by aerating compressed air obtained by an air compression mechanism resonating by wave force in water to aerate an inner bay area that is a closed water area because of its shape. A rectangular outer shell that resonates with water level fluctuations caused by long-period wave energy including sea surface vibration, and is formed in a rectangular shape is provided, and a plurality of openings are formed in this rectangular outer shell. The air compression is formed such that seawater is discharged only from a predetermined opening with different inflow coefficients, while the corners in the outer shell are conditioned to resonate with the water level fluctuation occurring in the outer shell. A mechanism is provided, the compressed air obtained by this air compression mechanism is connected via a constant pressure storage tank to an air diffusing pipe arranged on the seabed, and a recovery filter for floating impurities is arranged at the opening. Water quality improvement system using long period wave energy, characterized in that and.