JPS6157298A - Apparatus for purifying closed water area - Google Patents

Abstract

PURPOSE:To separately perform aeration under stirring, by sending a surface water layer rich in dissolved oxygen to a low water layer by a water feed apparatus to mix both layers under aeration and raising a part of the low water layer to the lower part of a spring layer while raising water sucked in from the remaining low water layer and the lower part of the spring layer to the surface layer. CONSTITUTION:An outer pipe 1 opened at upper and lower ends thereof are provided with water feed and drain openings 1a on the way thereof is vertically provided in water and an inner pipe 2 closed at the upper end thereof and opened at the lower end thereof is inserted in the outer pipe 1. An air chamber 3 is fixed to the outer periphery of the outer pipe 1 at the upper end thereof so as to cover the lower side of the outer pipe 1 while a water seal pipe 4, which partitions the space between the air chamber 3 and the lower outer periphery of the outer pipe to form inverted U-shaped water seal passages 4a, is provided so as to surround the lower end of the outer pipe from below to above within the air chamber 3 while the diameter of the lower end wall of the inner pipe is enlarged and, further, a surface water layer is mixed with air by a water feed apparatus 5 to send the air/water mixture from the upper part of the inner pipe. As a result, the low layer part and the surface layer part can be aerated under stirring simultaneously and separately without destructing a spring layer and ecology can be kept.

Description

[Detailed Description of the Invention] [Field of Application of Invention 7] This invention is a method for purifying closed water bodies such as lakes, reservoirs, and inner bays where eutrophication is progressing by efficiently supplying and purifying air to closed water bodies. 0 Regarding equipment [Conventional technology] In recent years, eutrophication has progressed in closed water bodies such as lakes and inner bays due to the accumulation of nutrients such as nitrogen and phosphorus from surrounding basins, and this has become a social problem. There is. For this reason, currently the method of regulating organic matter, nitrogen, and phosphorus in the inflow water of closed water bodies is being implemented as an effective means of preventing eutrophication.

[Problem that the invention seeks to solve]

However, because the full details of the eutrophication mechanism have not yet been elucidated and efficient purification methods have not been established, attempts to extremely purify and regenerate τ in closed water bodies such as lakes and marshes have not been made. The current situation is that almost nothing has been done.O-Ninvention was made in view of this current situation, and it is aimed at elucidating the entire mechanism of eutrophication, and from there devising a device to purify and regenerate closed water bodies. It is something.

[Means for solving problems]

The present inventors first believe that the premised mechanism of eutrophication progresses in the following manner.90 Lakes and marshes in Japan belong to the temperate zone, and have two cycles throughout the year: autumn and spring, and winter and summer. There are two periods of stagnation. During the stagnation period, as shown in Figure 2, the lake water is divided into the surface layer (a), the water temperature i layer (b), and the low layer (C), and the state of the lake water changes directly.

That is, in the surface layer (a), phytoplankton proliferates through photosynthesis using sunlight, and dissolved oxygen (DO) becomes supersaturated. On the other hand, the surface layer (&
), dead plankton fall and are decomposed into reeds, consuming DO and often resulting in anoxic conditions. When this oxygen deficiency occurs, H and S start to be generated, and at the same time iron,
Manganese, nitrogen, and phosphorus are eluted.

Then, in the next cycle, the eluted nutrients will not diffuse throughout the closed water area, promoting the progress of eutrophication.

Therefore, in order to break this vicious cycle of eutrophication, it is necessary to supply eWC to the lake bottom (101) and prevent the elution of nutrients and the like.

Regarding the method of supplying oxygen to lakes and marshes, the following two methods can be considered depending on the purpose and function, although it varies depending on the depth of the lake, etc., the progress of Kaneikai formation, etc.

■Circulating aeration method: Since this method destroys the bottom layer, it is suitable for lakes and marshes where the water depth is relatively shallow and there is an extreme lack of dissolved oxygen. It is also effective in improving the water quality of water source ponds that suffer from bad odor and taste.

■Deep water is a method of providing sufficient oxygen to deep water without destroying the stratification, and is also effective in preventing the temperature of surface water from dropping in the summer and preventing the outflow of turbid water.

Of these nine, the present invention further improves the circulation Il aerodynamics,
Table m (a
) and lower layer (C).

FIG. 1 shows the configuration of the present invention.
), an inner pipe (2), an air chamber (3), a water seal pipe (4), and a water supply device (5). Note that (100) indicates the water surface and (101) indicates the lake bottom.

The outer pipe (1) is the outer pipe of the double pipe, and is open at the top and bottom ends.
At the same time, float the lower end fl to the lake bottom (ZOO) side.
1) Install it vertically in the water by mooring it to the side. This outer tube (
11 is the surface layer (&
) This serves as a passageway for feeding towards the ) side. However, if a water supply/drainage port (1a) is provided in the middle, and if this port is located below the cline (b), some of the low water can be discharged from there, and on the other hand, the b) It can suck in water below.

The inner pipe (2) is a pipe inserted into the outer pipe (1) of the double pipe girder structure, and when it is inserted, there is a space for low water rise between it and the outer pipe (1). It is formed.

In addition, the upper end of this inner pipe (2) is closed, and the lower end is opened in an air chamber (3), which will be described later, to drain surface water to a low J'5 (
c) It serves as a passageway for sending water to @.

The air chamber (3) has its upper end along the outer periphery of the outer g[1],
It is provided to cover the lower side of the outer tube (1). This air chamber (3) is provided with a tank to store air between it and the lower part of the outer tube (1). The water seal tube (4) is located at the lower end of the outer tube (1) within the air chamber (3). The inner tube (
2) It is provided by expanding the diameter of the lower end wall and surrounding it upward. This water seal tube (4) partitions the air chamber (3) and the outer circumference of the lower part of the outer tube (1) while allowing only the upper part to communicate.]
The water supply device (5) mixes surface water and air, forming an inverted υ-shaped water seal passage (4a) and easily sealing the outer pipe (1) to prevent water from entering. At the same time, the mixed water is sent into the inner pipe (2) and is ejected upward into the air chamber (3).

[For production]

In the surface layer (a) of the lake stop, natural aeration occurs at the surface of the lake (Zoo) due to the influence of wind guards, and there is also the influence of photosynthesis guided by algae, so the surface water is contaminated with dissolved 02 carbon. has almost reached its saturation value ◇However, due to the heat of the sun, the lake surface (100) temperature has risen to near the air temperature.

A water supply system ffl transports this high-temperature surface water rich in dissolved oxygen.
(5) Pump up the pipe (arrow A) and suck the air (arrow port), mix these, and pour this mixed water into the inner pipe (arrow 2).
) to lead inward. At this time, due to the rise in water pressure, some of the air is dissolved, and the dissolved oxygen concentration in the mixed water becomes even higher. The heated water that has descended inside the inner tube (2) as shown by arrow C flows downward into the water seal tube (4) as shown by arrow 2. At this time, the warm water rich in dissolved oxygen mixes with the low-layer water as shown by the arrow H to raise the temperature of the low-layer water and raise the temperature of the water. On the other hand, as the flow rate of the heated water flowing below the water seal g(4) decreases as described above, the air that has not been dissolved in the mixed water and has become a bubble is separated from the water flow. Then, as shown by the arrow, it rises up the inverted U-shaped water seal path (4a) and accumulates in the upper part of the air chamber (3). The air accumulated in the upper part of the air chamber (3) passes through the inverted U-shaped water seal passage (4a) to the outer tube (
1) When conduction occurs inside, the water seal is broken and the accumulated air becomes a bullet-like bubble that rises at once inside Sotoyoshi (1), as shown in the arrows C, H, and C, creating an inverted siphon shape. At this time,
If the water supply/drainage port (la) in the middle of the outer pipe (1) is installed so as to open at the bottom of the layer (b), the low A3 water will be sucked in as shown by the arrow as the bullet-shaped air bubbles rise. 9.Furthermore, a part of the air passes through the same arrows as the above-mentioned air circulation route to the interstitial layer (
b) Stirring the low layer water discharged to the bottom.

On the other hand, if the bullet-shaped air further rises like an arrow,
Suction the water at the bottom of the Y8 layer (b) as shown by the arrow
It passes through N and is discharged to the τ surface layer 5 (&) side (arrow wa). The bubble outside mentioned on the water surface (Zoo) bursts at the water surface (Zoo),
Ripples are generated and spread on the water surface (100). At this time, the pumped and purified low-level water and the water at the bottom of the opening (b) spread on the water surface (Zoo) with ripples and are mixed with the surface water and diffused. At the same time, the rise in water temperature can be suppressed by mixing low-temperature low-level water and water below the cline (b).

In this way, the present invention provides water supply and drainage ports (1a) to prevent the surface layer (a) and the lower layer (1) from being destroyed without destroying the surface layer (1).
0) are individually stirred and aerated at the same time. That is, first, the lower layer (C) is aerated with surface water containing a large amount of dissolved oxygen, and the air sent along with the surface water to the lower layer (0) side is used to direct some of the low layer water to the lower part of the cline (b). It is discharged into the water and left behind, resulting in low agricultural water and EJ! (b) The water in the lower part is pumped up to the front ff1 (a) section to perform -lowering.

〔Example〕

Hereinafter, specific embodiments of the present invention will be described based on the drawings.

FIG. 3 shows an embodiment of the present invention, which is composed of an outer αQ, an inner pipe ■, an air chamber 0υ, a water sealing pipe C40, and a water supply device 0 (a). The outer tube αO is equipped with a float (6) at the upper part, and its lower part engages with the anchor a4 on the lake bottom (101) with a chain (6) via the air chamber (■), which will be described later. t#
: It is installed vertically in the water. In addition, the upper and lower ends of the outer pipe (LO) are open, and a water supply and drainage port α is provided in the middle thereof, and the length adjustment of the chain (6) [therefore, the water supply and drainage port α1] The opening at the bottom of (b) is merely an example of the above-described method of vertically installing the outer tube σQ, and it goes without saying that other methods may be used to vertically install the outer tube σQ.

The inner tube 4 is inserted into the outer tube aQ, with its upper and lower ends protruding from the outer tube uQ, and the upper end thereof is closed.
Also its lower end 1'! It has become an open space.

The air chamber ■ has an opening at the bottom 11. Outer tube through hole 0 on the bottom surface
), the outer tube αQ is passed through the through hole 09, and the peripheral edge of the through hole 0 is fixed to the outer periphery of the outer tube αQ. By installing in this manner, the air chamber OIJ covers the lower part of the outer tube. In addition, as mentioned above, a chain (
2) is moored and connected to the anchor (b). In addition, in this embodiment, a bottom plate 0 is provided at the center of the four inner pipes of the air chamber (1) in a direction perpendicular to the cough pipe (7), and the surface water flowing out from the inner pipe (7) is and change the direction of the mixed water of air bubbles and with it help the separation of air bubbles. Furthermore, an opening between the lower open peripheral edge of the air chamber (G) and the lower peripheral edge of the bottom plate is opened as an inlet/outlet Q, allowing communication between the inside of the air chamber (7) and the low J5 (0) side. .

The water seal tube θQ expands the diameter of the four lower end walls of the inner tube parallel to the bottom plate 0 in the air chamber (1), and folds in the middle to form the inner wall of the air tube and the outer circumferential wall of the outer tube head. The air chamber is extended upwards to enclose the lower end of the outer tube. The space is partitioned to form an inverted U-shaped water seal path, creating a groove structure that allows for water seals.

The water supply system f1 diagram shows a water suction pipe (9) with one end submerged in water on the table/m(a) side, and a low water head pump I connected to this.
s, an ejector ring that communicates with this, and a water transmission pipe that communicates with the inner pipe (7), and a pump that pumps water from the water suction pipe as shown in arrow A at the wharf. It has a function of suctioning and mixing air into the surface water with an ejector (as shown by the arrow), guiding this mixed water into the boiling inner tube of the water supply pipe 6, and causing it to descend therein. The inventors investigated the bubble rise rate and found that it was 0.3 rrv′s O
Measurements were obtained. Therefore, the descending flow velocity in the inner pipe (7) is 0.
．． The speed was kept at 3m/s or higher. In addition, it has become possible to save energy by using a low head pump (for the pump),
Furthermore, instead of the pump and ejector wheel, compressed air may be blown into the water pipe by a blower or compressor.

According to the above-described apparatus, surface water rich in core enzymes can be sent to the lower layer (C) and aerated. In addition, the undissolved air is separated from the water at the bottom plate o-val and becomes air bubbles) in the inverted U1-shaped water seal passage (6). If more than a certain amount accumulates and conducts into the outer tube, the water seal will rupture and form a reverse siphon.7!1. jL becomes a bullet-shaped bubble and ejects into the outer tube αQ all at once. As it rises, low-level water is sucked into the outer tube head, and a part of it is sucked into the lower part of the cocoon layer (b) through the water supply and drainage port α, and the remaining low-level water is sucked in through the water supply and drainage port α: cline ( b) The water in the lower part can be pumped up to the surface layer (&). ◎ Therefore, the lower layer (0) and the surface layer (a) can be stirred and aerated simultaneously and separately without destroying the cline (b).

〔Effect of the invention〕

According to the purification device of the present invention as described above, surface water rich in dissolved acids is sent to the lower layer and mixed with the lower layer water for aeration by increasing the amount of sedimentation due to air supply by the water supply device and increase in water pressure. , it is possible to eliminate the lack of nitrogen in the lower layer, and by providing an inverted U-shaped water seal path that causes bullet-shaped bubbles to rise intermittently, a portion of the low layer water rises to the bottom of the ePIE, reducing residual water shortage. and pJf! Since the water sucked in from the lower part can be made to rise to the surface layer and aerated on the water surface, the lower part and the surface moisture part can be agitated and aerated separately at the same time without flooding the barbed layer, which maintains the ecology. O has the excellent effect of making it possible to

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the trench bottom of the present invention, FIG. 2 is a schematic diagram showing the situation of a closed water area during the stagnation period, and FIG. 3 is an explanatory diagram showing an embodiment of the present invention. In the figure, (1) αQ is the outer tube, (2) ■ is the inner tube, (3) 00
is the air chamber, (4) (10 is the water seal pipe, (5) 4 is the water supply device, (la) αη is the water supply and drainage port, (4 @ 21 is the inverted U-shaped water seal path, (100) is the water surface, ( 101) shows the bottom of the lake. Atsushi Hara, licensed patentee of Nippon Kokan Co., Ltd.

Claims (1)

[Claims] It is installed vertically in water with its upper and lower ends open, and An outer pipe with a water supply and drainage port inside, and Inserted into the tube, the upper end is closed and the lower end is opened. to cover the inner tube and the lower part of the outer tube. is provided, and its upper end is fixed to the outer periphery of the outer tube. an air chamber, and enclose the lower end of the outer tube within the air chamber. While expanding the diameter of the lower end wall of the inner tube, move upward. It is surrounded by an air chamber and under the outer pipe. Separate the outer periphery to form an inverted U-shaped water seal path. A water seal tube that mixes surface water and air. Water supply that transports mixed water from above inside the inner pipe A closed body of water characterized by having a device. purification equipment.