JPH07222995A - Aeration facility for river - Google Patents

Abstract

PURPOSE:To enable effective aeration of a river by highly dense supply of diffusing air over the entire width of the river. CONSTITUTION:A part of the bank 1 of a river is cut to extend the width of the river, and an air diffusion pipe 3 is stretched over the entire width of the river. Lots of air diffusion holes 7 are formed in the whole circumference or a part of the circumference of the wall of the pipe 3. Air introduced into the pipe 3 from an air supply source 5 is discharged from the holes 7 to aerate water in the river. The range of aeration covers the whole width of the river, and air is discharged from lots of the holes 3, so that highly dense aeration can be conducted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aeration facility for a river, which promotes a purification action by supplying dissolved oxygen (DO) to water flowing in the river.

[0002]

2. Description of the Related Art Along with the development of industry and changes in lifestyle, water pollution of many rivers, lakes and reservoirs has become a problem. Originally, rivers that had been purified by self-cleaning action, especially in rivers around urban areas, increased inflow of industrial and domestic wastewater, and pollutants in excess of the self-cleaning ability flow in, so COD (chemical oxygen demand) and The self-cleaning action of BOD (biochemical oxygen demand) is insufficient, and deterioration of water quality is a problem. Under such circumstances, in recent years, various purification measures have been taken to purify polluted river water. FIG. 6 is a front view showing a conventional aeration facility for purifying a river by aeration. In the aeration facility shown in this figure, the diffuser pipe 10 is arranged in the width direction to the bottom of the river, and the air sent from the air supply source 11 is discharged from the diffuser pipe 10 into the river water to generate the river water. Aeration. Therefore, the air diffuser 10 has 10 to 10 in the longitudinal direction.
Air diffuser holes 12 (which may be a diffuser) are provided in a line at intervals of 0 cm.

[0003]

Generally, in rivers around the city, a bank 1 is constructed by diagonally laying revetment blocks on the riverbank, and because of this bank 1, the lateral width of the river goes downward. Therefore, it becomes narrower and the narrowest at the bottom of the river. Therefore, even if the air diffuser 10 is arranged over the entire width of the river bottom, the portions A on both sides of the river will be out of the floating range of the bubbles discharged from the air diffuser 10, and the water that has not been aerated will remain on both sides A. Will pass through. In addition, in the air diffuser 10 used in the conventional aeration facility,
Since the air diffuser holes 12 were provided only in one row in the vertical axis direction, the gap B between the bubble bands 13 discharged from the air diffuser holes 12 was large, and a large amount of water was left in the gap B without being aerated. Was passing. As described above, in the conventional aeration facility, the aeration efficiency is poor, and therefore, in order to perform sufficient aeration, it is necessary to increase the aeration amount or arrange a number of air diffusers in the river basin. There was a problem that operation or equipment costly. The present invention has been made to solve such a problem, and an object of the present invention is to provide an economical aeration facility for a river that can efficiently aerate the river.

[0004]

In order to achieve the above-mentioned object, the aeration facility of the present invention has a structure in which a part of a river bank is cut out to expand the lateral width of the river bottom, and the entire or partial circumference of the peripheral wall. Further, an air diffusing tube having a large number of air diffusing holes is arranged over the entire width of the river bottom, and the air diffusing tube is connected to an air supply source.

[0005]

As described above, according to the present invention, since the lateral width of the river bottom is enlarged by cutting out a part of the river bank and the air diffuser is arranged over the entire width of the river bottom, the diffusing pipes are provided on both sides of the river. It is possible to spread the released air and efficiently perform aeration. Moreover, since a large number of diffuser holes are provided on the entire or partial peripheral surface of the diffuser pipe, the gap of the band of bubbles discharged from these diffuser holes is small, and it is possible to aerate the flowing river water without fail. , More efficient aeration can be realized.
The rivers to which the present invention is applied include not only natural rivers but also artificially formed water channels.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a front sectional view showing an aeration facility for a river according to an embodiment of the present invention, and FIG. 2 is a perspective view showing the appearance of the facility. In this embodiment, the notches 2 and 2 are provided at the opposite positions on the banks 1 and 1 on both banks of the river.
Is provided. These notches 2 and 2 are formed by cutting the inclined surface of the bank 1 to a position outside the boundary line 1a with the water surface, and the notch side surface 1b is a vertical plane with respect to the riverbed. As a result, the river width at the notch formation becomes equal from the river bottom to the water surface.

An air diffuser 3 is provided over the entire width at the river bottom between the notches 2 and 2. The tip of the air diffuser 3 is a closed end, and the base end side is connected to the air supply source 5 via the pipe 4.
Connected with. The air supply source 5 may be an electric pressure pump or the like as long as it can supply the air amount necessary for river aeration to the entire hollow portion of the air diffuser 3. This air source 5
Is usually installed on the riverbed near the location of the diffuser pipe 3. In addition, in order to prevent the water flowing into the diffuser pipe 3 from the diffuser hole 7 described later from flowing into the pipe 4 side at the connecting portion between the diffuser pipe 3 and the pipe 4 while the air supply is stopped. ,
The check valve 6 may be provided.

A large number of air diffusion holes 7 are formed in the peripheral wall of the air diffusion pipe 3 as shown in FIGS. These air diffusing holes 7 may be formed over the entire peripheral surface of the peripheral wall, or may be formed only on a partial peripheral surface of the peripheral wall, for example, the upper half peripheral surface. Here, the shape and arrangement of the air diffuser holes 7 may be arbitrary, as long as they are distributed and provided at least in the circumferential direction of the air diffuser pipe 3, and are not particularly limited. It is preferable that the bubbles rising from the air diffuser 3 form a flat surface so that there is no water space in which the bubbles do not rise. For example, in the embodiment shown in the drawing, the air diffuser holes 7 are bored in the vertical axis direction at an arbitrary and as narrow interval as possible, and the air diffuser holes 7 that are continuous in the vertical axis direction and form each row 8 are arranged in the upper and lower rows. The perforated portions are perforated by slightly shifting in the same direction, and the peripheral surface of the air diffuser is bored except for the bottom so that the air diffuser holes 7 are spirally formed in a fine pitch in the vertical axis direction.
By forming in this way, the band interval of the bubbles discharged from each air diffuser 7 and rising to the water surface can be made narrower, for example, about 5 mm, so that the bubbles cross the circulating water in a plane shape. Since it rises in the water, it is possible to prevent water from passing through without being aerated. The cross-sectional shape of the air diffuser 3 can be arbitrarily selected such as polygonal or circular. Further, the equivalent diameter of the air diffusing tube 3 is also arbitrary, and it is sufficient that air can be circulated and air can be ejected through the air diffusing holes 7 that are formed as described later. The material of the air diffuser 3 is not particularly limited as long as it can maintain its shape in the river water to be purified without deterioration such as corrosion for a long time. Generally, a vinyl chloride tube can be used.

Since the present invention is configured as described above, the air sent from the air supply source 5 into the hollow portion of the air diffusing pipe 3 is discharged into the river water through the air diffusing holes 7. The air discharged from the air diffuser 7 forms a continuous band 9 of bubbles as shown in FIG. 5, and there is almost no gap 13 between the respective bubble bands generated by the conventional method, that is, , Forming a bubble plane and rising toward the water surface. Part of the air released from each air diffuser 7 dissolves in the river water, increasing the amount of dissolved oxygen. As a result, aeration purification of river water is realized. In this embodiment, since the lateral width of the river is equalized from the river bottom to the water surface by the notches 2 and 2 formed in the river bank 1, 1, the bubbles from the air diffusing pipes 3 arranged in the entire width of the river bottom are prevented. The belt extends all over the width of the river, improving the aeration efficiency. Further, in the air diffuser 3 of this embodiment, a large number of air diffusers 7 are formed in the circumferential direction and the longitudinal direction on the entire circumferential surface or a partial circumferential surface of the circumferential wall, so that the air is discharged from each of the diffused holes 7. Since the band of bubbles is formed on the surface of the river water at high density, the aeration efficiency is further improved.

The present invention is not limited to the above-described embodiment, but various modifications and applications are possible within the scope of the invention. For example, in the above embodiment, the notch having a width that makes the lateral width of the river equal from the river bottom to the water surface is formed in the bank, but due to this notch, the water pressure resistance performance of the bank decreases and falls below the safety standard. The cutout width may be set as appropriate so that the width of the riverbed is expanded as much as possible while ensuring the safety standards. Even in this case,
As the width of the riverbed is expanded, the range in which aeration and aeration can be performed is wider than in the past, and the effect of the present invention that the aeration efficiency is improved is achieved. In addition, since dust that floats in the water and on the water surface tends to collect on the surface of the water where the band of bubbles discharged from the air diffuser floats up, a garbage collection facility, a flocculant spraying facility, etc., will be installed along with the aeration. It is also possible to purify rivers.

[0011]

As described above, according to the river aeration facility of the present invention, sufficient aeration can be performed even on both sides of the river, which was not sufficient in the conventional facility, and each bubble emitted from the diffuser pipe is Since the bands can be formed at narrow intervals, the aeration of the river can be efficiently performed with a smaller amount of air diffusion than in the conventional case, which is economical in terms of operation and equipment costs.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an aeration facility for a river according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an appearance of the facility.

FIG. 3 is an enlarged front view showing a part of an air diffuser which is a constituent member of the facility.

FIG. 4 is a side sectional view of the same.

FIG. 5 is a side sectional view showing an aeration situation of a river by the facility.

FIG. 6 is a front cross-sectional view showing a conventional river aeration facility.

[Explanation of symbols]

 1 Levee 2 Notch 3 Air diffuser 5 Air supply source 7 Air diffuser

Claims (1)

[Claims] 1. A river bank is partially cut away to increase the lateral width of the river bottom, and an air diffuser having a large number of air diffuser holes is provided on the entire circumference or partial circumference of the surrounding wall over the entire width of the river bottom. Also, an aeration facility for a river, characterized in that the air diffuser is connected to an air supply source.