JPH08192143A - Method and apparatus for partitioning water by fine air bubbles - Google Patents

Abstract

PURPOSE: To float sludge in a partitioned area while preventing the diffusion of sludge by partitioning a region having to treat sludge by air bubbles. CONSTITUTION: A fine air bubble generating means is arranged on the bottom part in water in which a sludge substance is present and constituted of a hollow tubular member 2 having opening parts 5 provided to the top part thereof and forming a closed planar shape by the continuation of the opening parts. The closed planar shape has the same contour as a region to be partitioned by fine air bubbles and high pressure air is supplied to the hollow part 2a of the tubular member 2 to generate continuous fine air bubbles from the opening parts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for partitioning a predetermined region such as a river or a lake where sludge substance exists by generating a large amount of fine bubbles with the fine bubbles.

[0002]

2. Description of the Related Art Conventionally, there is a technique for removing sludge substances by providing fine air bubble generating means at the bottom of water where sludge substances are present. For example, an aeration device or the like corresponds to this.
Here, since the aeration device is intended to be used in a closed space such as a water tank, when it is used in a river or lake, it only diffuses sludge and can recover sludge substances. There wasn't.

On the other hand, water containing a large amount of fine bubbles is supplied to a river or a lake (where sludge substances are present), and the sludge substances are floated by the adhesion of the fine bubbles, and the floating sludge substances are removed. It is known that the rivers and lakes can be purified by removing them.

[0004]

However, when supplying water containing a large amount of fine bubbles to a river or lake where purification treatment is to be performed, the sludge substance settled at the bottom is diffused, and the sludge substance is dispersed. However, there is a possibility that the degree of pollution will increase due to the widespread diffusion of the. In addition, there is a problem that the sludge substance is fragmented while being spread over a wide area, and the amount of sludge recovered is reduced.

In order to cope with these problems, there is a demand for a technique capable of partially recovering sludge existing in a predetermined area without diffusing sludge substances. However, at present, such a technology has not been provided yet.

The present invention has been proposed in view of the problems of the prior art as described above, and by partitioning the region to be treated with sludge by fine bubbles, it is possible to prevent the sludge from diffusing and raise it. The purpose is to provide such a method and apparatus.

[0007]

The method of partitioning water with fine bubbles according to the present invention includes the step of installing fine bubble generating means at the bottom of water in which sludge substances are present, wherein an opening is formed at the top and The fine bubble generating means is constituted by a hollow tubular member whose openings continuously form a closed plane shape, and the closed plane shape is the same as the contour of the region to be partitioned by the fine bubbles, and the hollow of the tubular member. Supplying high-pressure air to the portion to generate continuous fine bubbles from the opening.

Further, the device for partitioning water with fine bubbles according to the present invention is installed at the bottom of water in which sludge substance exists, and in the device for partitioning water with fine bubbles by generating a large amount of fine bubbles, an opening is provided at the top. A hollow tubular member having a portion formed therein and the opening portion continuously forming a closed plane shape, wherein the closed plane shape is formed in the same shape as the contour of a region to be partitioned by fine bubbles. The hollow portion of is communicated with the supply source of high-pressure air and also with the opening.

In the practice of the present invention, in order to generate a large amount of fine bubbles, water is caused to flow through a channel having an annular slit, and the downstream portion of the annular slit is gradually curved toward the downstream side. A curved surface having an increasing radius is formed, and high-pressure air is supplied to a flow path of water through an air supply path communicating with the annular slit, and the supplied high-pressure air is separated from the curved surface. When it makes fine bubbles,
Is preferred. As such a device, an annular slit is formed in the flow path, and the downstream side portion of the annular slit is formed of a curved surface whose radius of curvature gradually increases toward the downstream side, and is connected to the annular slit. An air supply path for supplying high-pressure air to the flow path is provided, and the curved surface that constitutes the downstream side portion of the annular slit is configured so as to become fine bubbles when the supplied high-pressure air separates from the curved surface. It is preferable to use a device for generating fine bubbles.
However, the present invention is not limited to this, and it is also possible to use other types of fine bubble generators.

Further, the opening may be a slit, or may be a hole continuously drilled at relatively short intervals.

[0011]

According to the present invention having the above-mentioned structure,
By supplying the high pressure air to the opening, a large amount of fine bubbles are generated from the opening and rise toward the water surface. As a result, the fine air bubbles act like an air curtain to prevent sludge and the like from diffusing. And
Since the opening has a closed shape, an air curtain made up of a large number of fine bubbles also forms a closed area having the same planar shape as the closed shape, so that sludge is removed from the area within the closed shape to the outside. Is prevented from moving or leaking.

Further, a large amount of fine bubbles not only functions as an air curtain, but also adheres to the sludge existing in the area within the closed shape to float the sludge. As a result, the sludge in the area is partially floated and collected.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 illustrates an embodiment in which a device for carrying out the method of partitioning water in the present invention is used, in which a sludge purifying device 10 is installed in the water W to purify sludge, and its surroundings. Partition the underwater range to purify sludge,
In order to prevent the diffusion of sludge, a partitioning device 1 composed of a hollow tubular member 2 having a closed planar shape that partitions water into bubbles is installed in a desired range and shape.

Further, these devices are connected to an air compressor (not shown) provided in the air compressor chamber 12 by air circuits 9 and 11.

FIG. 2 shows a cross section of the tubular member 2 of the partition device 1, which is composed of a flexible non-stretchable member (for example, FRP) on the inner surface of an elastic body (for example, rubber). The tubular member 2 formed by the
There is provided an opening 5 that communicates with the lower opening 4 of the opening 5.

An annular slit 3 is provided on the wall surface of the opening 5, and a curved surface whose radius of curvature R in the longitudinal section increases from the annular slit 3 toward the downstream side of the opening 5 (upward in the drawing). 3a is formed so that the inclination angle θ between the tangent line at the end of the curved surface and the center line is 10 degrees.

Further, the slit 3 is formed as a portion where a hollow portion 2a which is an air reservoir of the tubular member 2 opens to the opening portion 5, and the hollow portion 2a is provided in an air compressor which is a supply source of high pressure air. It is connected by an air circuit 9. Here, the width dimension B at the place where the slit 3 is opened or communicated with the opening 5 is formed to be 0.3 mm.

High-pressure air from the air compressor is supplied to the hollow portion 2a of the tubular member 2 via the air circuit 9. Then, the high pressure air in the hollow portion 2a is supplied to the annular slit 3
From the curved surface 3a by the so-called "Coanda effect", and is separated from the curved surface 3a near the curved surface 3a reaching the upper surface 6 of the opening 5 to form bubbles indicated by K and rise in the water. . In other words, the high pressure air has a curved surface 3a.
It becomes fine bubbles when peeled from.

As a result of various studies and experiments, the inventor has the inclination angle θ of 5 to 30 degrees, the slit width B of 0.001 mm to 0.5 mm, and the air pressure of the surroundings. It has been found that when the pressure is higher than the water pressure by 1.0 to 10 kg / cm ² , the high-pressure air becomes fine bubbles and is mixed in the water when the high-pressure air is separated from the curved surface 3a. In this embodiment, all the conditions relating to the shape from the slit 3 to the upper curved surface 3a and the conditions relating to the air pressure are the same as those described above (for high pressure air to be separated from the curved surface 3a, bubbles are made finer). The condition) is satisfied. Here, the opening may be a continuous opening along the closed plane shape.

FIG. 3 shows another embodiment of the present invention in which a slit 13 which is an opening and a curved surface 15 which is continuous with the slit 13 are directly provided on the top 14 of a tubular member 2 which constitutes a closed plane shape. Hollow part 2a which is an air reservoir of the tubular member 2
Is connected to an air compressor (not shown) by an air circuit 9 via a connection port 8.

The slit 13 is connected to a curved surface 15 that expands as it goes away from the opening on the hollow portion 2a side, and its cross-sectional shape is formed so that the curvature R increases toward the top surface 14a. An intersection angle θ between the tangential direction at the portion reaching 14a and the small plane of the top surface 14a is formed in the range of 5 to 30 degrees (for example, 10 degrees) with respect to the top surface 14a,
The width B of the slit 13 is 0.3 mm. Since the operation of this embodiment is the same as that of the embodiment of FIG. 2, duplicated description will be omitted.

The illustrated embodiment is merely an example, and is not intended to limit the technical scope of the present invention. For example, in the embodiment of FIGS. 2 and 3, instead of the slit 3 or 13, a plurality of holes formed continuously at short intervals are formed, and the place where the holes are drilled is high pressure air from the curved surface. If it is configured so as to satisfy the above-mentioned conditions for making the bubbles fine when peeled, fine bubbles are generated from the holes, and an air curtain can be formed. Forming a plurality of holes is simpler in structure and easier to produce than forming slits.

According to the present invention, when a tubular member which is a bubble generating means is formed into a desired closed plane shape and a high pressure air is supplied, a large amount of bubbles are generated in water in a predetermined shape, and the water is bubbled by the bubbles. It is intended to include all technologies capable of partitioning into a predetermined shape.

[0025]

The effects of the present invention are listed below. (1) The water to be purified can be partitioned into a desired shape. (2) By recovering sludge while partitioning water into air bubbles, sludge can be efficiently recovered without diffusing. (3) Since the device is simple and fine bubbles can be easily generated, the cost of recovery work can be kept low.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of the partition device of FIG.

FIG. 3 is an enlarged cross-sectional view of a main part showing another embodiment of the present invention.

[Explanation of symbols]

 1 ... Bubble partitioning device 2 ... Tubular member 3, 13 ... Slit 4 ... Lower part of opening 5 ... Opening part 6 ... Upper surface 7 ... Lower surface 3a, 15 ... Curved surface

Claims (2)

[Claims] 1. A hollow tubular member including a step of installing fine air bubble generating means at the bottom of water in which sludge substances are present, wherein an opening is formed at the top and the opening continuously forms a closed plane shape. The fine bubble generating means is constituted by,
The closed plane shape is the same as the contour of a region to be partitioned by fine bubbles, and includes a step of supplying high-pressure air to the hollow portion of the tubular member to generate continuous fine bubbles from the opening. A method of partitioning water with fine bubbles. 2. A device, which is installed at the bottom of water containing sludge substances and divides water by fine air bubbles by generating a large amount of fine air bubbles, wherein an opening is formed at the top and the opening is continuous. It has a hollow tubular member forming a closed plane shape, the closed plane shape is configured to have the same shape as the contour of the region to be partitioned by the fine bubbles, and the hollow portion of the tubular member communicates with a supply source of high pressure air. A device for partitioning water with fine bubbles, which is also in communication with the opening.