JPH05298A - Apparatus and method for mixing raw water and air - Google Patents

Abstract

PURPOSE:To obtain a mixer decreasing running cost and installation cost and making an apparatus compact by sucking the open air in a main body by the reduced pressure generated in the main body by the outflow of raw water. CONSTITUTION:Raw water enters the inlet end part 22 of an introducing pipe 14 to flow toward the outlet end part thereof at a high speed. When this raw water flows out to the outside at a high speed from the inlet end part of an outflow pipe 16, a cavity part 10 becomes a reduced pressure state by the flow of the raw water and the open air is sucked in the cavity part 10 from the air inflow pipe 18 provided to the cavity part 10 to be mixed with the raw water on the downstream side of the outlet end part 20. By this constitution, raw water is mixed with air by utilizing the flow of raw water and a compact and efficient mixer can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for mixing air with raw water in the treatment of raw water such as sewage, industrial wastewater, river water, well water, and stored water.

[0002]

2. Description of the Related Art The mixing of air used in the treatment of raw water is the same as the aeration in activated sludge treatment or the aeration in the contact aeration biological treatment method. Mixing is widespread.

Such mixing of air is generally performed by sending air into raw water by a compressor or the like (Japanese Patent Laid-Open No. 48-48).
29672).

[0004]

However, in the above-mentioned conventional air mixing method, since it is necessary to use the air compressor, the running cost for air mixing is high, and a container for aeration is required. Therefore, the equipment cost is high, and since it is necessary to make a large contact between the gas and the liquid, it is difficult to make the apparatus compact.

The present invention has been made in order to solve the above problems, and the running cost for air mixing is low, and the equipment cost is also low because no aeration container is required. It is an object of the present invention to provide a raw water / air mixing apparatus and a method therefor, which can be made compact.

[0006]

In order to solve the above problems, the first invention is constructed as follows.

That is, the device according to the present invention comprises a body 12 having a cavity 10 therein, and a cavity 1 in the body 12.
Raw water introduction pipe 14 for introducing raw water into
0) The raw water outflow pipe 16 for flowing out the raw water in the outside, and the air suction pipe 18 for sucking the outside air into the main body 12 due to the pressure reduction in the main body 10 caused by the outflow of the raw water. ing.

The device according to the second aspect of the present invention further includes a main body 12 having a hollow portion 10 therein, and a hollow portion 10 in the main body 12.
A raw water inlet pipe 14 for introducing raw water into the main body 12, a raw water outlet pipe 16 for letting out the raw water in the cavity 10 to the outside, and a pressure reduction in the main body 10 caused by the outflow of the raw water to bring the outside air into the main body 12. The raw water inlet pipe 14 has an outlet end 20 of the inlet pipe 14 formed as a narrower portion than an inlet end 22, and the raw water inlet pipe 18 has an inlet end 24 of the raw water outlet pipe 16. Is formed to have a larger diameter than the outlet end 20 of the raw water introducing pipe 14, and the outlet end 20 of the raw water introducing pipe 14 is arranged in the inlet end 24 in a loosely fitted state.

In the method for mixing raw water and air according to the third aspect of the invention, the raw water is introduced from the raw water introducing pipe 14 into the cavity 10 existing inside the main body 12, and the raw water is discharged from the raw water outflow pipe 16 to the outside. At the same time, the external air is introduced into the main body 12 by the pressure reduction in the cavity 10 due to the outflow, and the external air and the raw water are mixed.

[0010]

In the present invention, the raw water rapidly flows from the inlet end 22 of the raw water introducing pipe 14 toward the outlet end 20 in the hollow portion 10 shielded in the main body 12, and the raw water further flows out. When flowing out from the inlet end 24 of the pipe 16 to the outside at a high speed, the flow of the raw water brings the inside of the hollow portion 10 of the main body 12 into a decompressed state.

As a result, air in the atmosphere is sucked from the air suction pipe 18 provided in the hollow portion 10, and a white foam layer is formed downstream of the outlet end 20 of the raw water introduction pipe 14. The air and raw water are mixed until such time.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to FIG. In the figure, reference numeral 12 indicates a main body, and a shielded hollow portion 10 is provided inside the main body 12.

Reference numeral 14 denotes a raw water introducing pipe, and both ends of the raw water introducing pipe 14 have an inlet end 22 and an outlet end 20.
And the outlet end 20 is configured as a narrower portion than the inlet end 22.

Further, the outlet end 20 side is inserted and installed in the cavity 10 in the main body 12.

Next, reference numeral 16 denotes a raw water outflow pipe, and the raw water outflow pipe 16 is loosely fitted and connected to the raw water introduction pipe 14 in the hollow portion 10 and is installed in a substantially straight line.

Here, as the raw water flows from the inlet end 22 of the raw water inlet pipe 14 to the outlet side of the raw water outlet pipe 16,
The inside of the main body 12 is in a decompressed state, which causes the air suction pipe 1
External air is forcibly sucked into the hollow portion 10 from 8 and the external air and raw water are mixed downstream in the vicinity of the outlet end 20 of the raw water introducing pipe 14.

Here, an actual air mixing apparatus having the structure shown in FIG. 1, that is, the raw water introducing pipe 1
4, the outlet end 20 has an inner diameter of 2 mm, and the raw water outflow pipe 1
When an inner diameter of the inlet end portion 24 of 6 is 4 mm and an inner diameter of the air suction pipe 18 is 0.8 mm, and water having a water temperature of 15 ° C. is flowed at a flow rate of 40 l / min. The amount of dissolved oxygen was measured. The result is shown in FIG.

The constituent members of the air mixing apparatus of the present invention may be any hard member, and stainless steel is preferably used.

The shape and volume of the cavity 10 in the main body 12, the diameter of the inlet end 22 of the raw water introducing pipe 14, the diameter of the outlet end 20, the diameter of the inlet of the air suction pipe 18, etc.
It depends on the amount of raw water to be treated, the flow velocity, the temperature, the amount of impurities, etc., and cannot be clearly limited, but the external air and the raw water are mixed slightly downstream of the outlet end 20 of the raw water introducing pipe 14. It is desirable that it be designed so that a white layer is produced.

[0020]

The present invention is constructed as described above. Further, according to the present invention, regarding the treatment of raw water such as sewage, industrial wastewater, river water, well water, and stored water, air mixing is required for biological treatment and the like, and an air mixing device as a means is a compressor. Such a power source is not required, and the flow of raw water is used for mixing with air, so that it is possible to provide a compact and efficient air mixing apparatus and method thereof.

[Brief description of drawings]

FIG. 1 is an explanatory view of an embodiment of the present invention.

FIG. 2 is an explanatory view of the operation of the embodiment.

[Explanation of symbols]

10 cavity 12 body 14 Raw water introduction pipe 16 Raw water outflow pipe 18 Air suction pipe 20 Exit end 22 Entrance end 24 Inlet end of raw water outflow pipe

Claims (3)

[Claims] 1. A body (1) having a cavity (10) therein.
2), a raw water introduction pipe (14) for introducing raw water into the cavity (10) in the main body (12), and a raw water outflow pipe (16) for outflowing the raw water in the cavity (10) to the outside. An air suction pipe (18) for sucking external air into the main body (12) by decompressing the main body (10) with the outflow of the raw water.
And a mixing device for raw water and air. 2. A body (1) having a cavity (10) inside.
2), a raw water introduction pipe (14) for introducing raw water into the cavity (10) in the main body (12), and a raw water outflow pipe (16) for outflowing the raw water in the cavity (10) to the outside. An air suction pipe (18) for sucking external air into the main body (12) by decompressing the main body (10) with the outflow of the raw water.
And the raw water introducing pipe (14) is
The outlet end (20) of 4) is formed as a narrower portion than the inlet end (22), and the inlet end (24) of the raw water outflow pipe (16) is the outlet end () of the raw water inlet pipe (14). 20) and a raw water characterized in that the outlet end (20) of the raw water introduction pipe (14) is arranged in a loose fit state inside the inlet end (24). Air mixing device. 3. A cavity (1) existing inside the main body (12).
Raw water is introduced into the inside of 0) from the raw water introducing pipe (14), the raw water is discharged from the raw water outflow pipe (16) to the outside, and the main body (1) is decompressed in the cavity (10) by the discharge.
2) A method of mixing raw water and air by introducing external air into the interior and mixing the external air and raw water.