JP2973305B2 - Pressurized oxygen dissolution method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for dissolving oxygen in water with high efficiency by pressurized dissolution of air and pure oxygen together with aeration facilities in wastewater treatment, and the lack of dissolved oxygen in water in rivers and lakes. It is about.

[0002]

2. Description of the Related Art Aeration using oxygen is performed in wastewater treatment facilities and dirty rivers and lakes.
Methods for maintaining the activity of microorganisms and treating wastewater are known.

[0003] This method can maintain a high dissolved oxygen concentration with a small air volume compared to ordinary air aeration, so that it is suitable for treating high-concentration sewage and industrial wastewater, and requires a small site area of the facility. In addition, there is a merit that can be used for improvement of an overloaded treatment plant.

[0004]

When performing conventional aeration, air or oxygen is released as air bubbles from an outlet submerged in the water bottom, and the dissolved oxygen in the water is increased while floating the air bubbles. However, such a method causes a problem that the efficiency of dissolving oxygen is low, so that a demand for a high oxygen supply rate under a high load cannot be satisfied.

The present invention addresses the such circumstances on ordination, in particular by finding mixed and dissolved scheme in water of at least oxygen gas, by releasing air solutions then pressurized treated water and oxygen, in the treated water The purpose is to greatly increase the amount of dissolved oxygen.

[0006]

According to the pressurized oxygen dissolving method of the present invention which meets the above-mentioned object, water pumped by a pressurizing pump or the like is put into a pressurizing tank, and pressurized oxygen is supplied into the tank. was dissolved in water the oxygen under pressure by, later oxygen microbubbles and without the above-mentioned dissolved by the water to release the air, by floating Yu the fine bubbles in the water of oxygen of the bubble When dissolving in water, the above-mentioned pressurizing tank is formed in a vertical cylindrical shape, and a nozzle portion is formed in the upper part of the outer peripheral portion of the pressurizing tank , which injects water in a tangential direction of the tank from obliquely above the liquid level.
To, characterized Rukoto oxygen is rotated in a tank to generate a vortex in the pressurizing tank while entrained oxygen tank top by the water jetted from the nozzle portion is dissolved in water.

[0007]

According to the oxygen dissolving method of the present invention, a large amount of oxygen is dissolved in water by applying pressure,
-Released by excess oxygen fine bubbles and without that was not dissolved in the normal atmospheric pressure, by the fine bubbles float long in the water, secondary oxygen transfer oxygen dissolution of high efficiency is performed happening However, at this time, the water in the pressurizing tank
When dissolving the oxygen in the tank,
Since tangentially water is jetted to cause a vortex flow in the tank while entrained oxygen tank top of Tan
Rotates in click to allow aeration deep layer of water enhances the introduction diffusion effect of oxygen, the dissolution efficiency can be greatly improved, thereby performs oxygenation lapping machine with high efficiency in water, release air solutions It is possible to greatly increase the amount of fine bubbles at the time.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
An embodiment of the present invention will be described.

FIG. 1 is a block diagram showing an apparatus used in the oxygen dissolving method according to the embodiment of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a sectional view taken along line BB of FIG. Denotes a pressurizing pump for introducing water, 2 denotes a tank for pressurizing, 3 denotes a compressor for pressurizing air, and 4 denotes an oxygen cylinder (or oxygen generator).

The pressurizing pump 1 supplies water from the pool P to the pressurizing tank 2 by a water guide pipe 1a, and a nozzle 1b is provided at an end of the water guide pipe 1a on the tank side. As shown in FIGS. 2 and 3 , the nozzle portion 1b is provided with the pressurizing tank 2 provided in an upright cylindrical shape.
Is installed near the outer periphery of the inside , and injects water obliquely downward in the tangential direction of the tank 2 from above the water surface,
2 kg / cm ^{2 to} 5 kg / c by the pressure pump 1
It is pressurized to the m ^2.

On the other hand, the pressurizing tank 2 is provided with a water level detecting sensor 5, a pressure gauge 6, a drainage solenoid valve 7 and a pressure regulating valve 8, and the amount of water supplied from the pressurizing pump 1 is provided. And pressure can be automatically adjusted. The air compressor 3 squeezes and sends outside air (air) to the upper part of the pressurizing tank 2 by a ventilation pipe 3a. The ventilation pipe 3a is provided with a solenoid valve 7 and a regulator 9.

The oxygen cylinder 4 sends pure oxygen to the upper part of the pressurizing tank 2 through a vent pipe 4a.
In this example, the ventilation pipe 4a is connected to the ventilation pipe 3a of the air compressor 3. A regulator 9, an oxygen flow meter 10, a solenoid valve 7 are provided in the ventilation pipe 4 a of the oxygen cylinder 4.
By controlling the amount of oxygen, air having an arbitrary oxygen concentration can be supplied to the pressurizing tank 2 in a pressurized state by the air compressor 3.

That is, the pressurized oxygen dissolving method according to the embodiment of the present invention utilizes such an apparatus. First, water pumped by the pressurizing pump 1 is supplied to the pressurizing tank 2 and the compressor Oxygen pressurized together with air by 3 is supplied into the tank 2 to dissolve oxygen in water under pressurized state. Then, by opening the pressure adjusting valve 8 of the pressurizing tank 2, the pressure in the tank 2 is made open to the atmosphere, whereby oxygen dissolved in the water in the pressurized state is formed into fine bubbles in the water.

The microbubbles of oxygen (air) thus generated are very small, having a diameter of 5 to 10 μm, and float in water for a long time after generation. Then, secondary oxygen transfer occurs due to the long-time floating of the fine bubbles, and high-efficiency oxygen dissolution is performed again in the process. Further, in the apparatus of the embodiment, since the water is injected from the nozzle portion 1b so as to generate a vortex inside the tank 2 while entraining the oxygen in the upper portion of the pressurizing tank 2, aeration to a deep layer of the water is enabled. To increase the effect of introducing and diffusing oxygen and greatly improve its dissolving efficiency, thereby enabling high-efficiency oxygen supply to water and greatly increasing the amount of microbubbles in the water when it is open to the atmosphere. Becomes

[0015]

As described above, according to the pressurized oxygen dissolving method of the present invention, water is put into a pressurizing tank, and pressurized oxygen is supplied into the tank to reduce the oxygen in a pressurized state. The dissolved oxygen is converted into fine bubbles by dissolving it sufficiently in water and then releasing this water to the atmosphere.
By flotation the fine bubbles in the water and can dissolve a oxygen of the bubble again in water, the liquid under pressure
Water is sprayed from diagonally above the surface in the tangential direction of the tank to
Effect more oxygen in water by Rukoto rotated by involving
Together to rate well dissolved, excess oxygen fine bubbles and without that was not dissolved in the normal pressure by release air solution, by long float this Pisa reference example bubbles in the water,
It is possible to perform high-efficiency oxygen dissolution by secondary oxygen transfer, which sufficiently responds to the oxygen supply rate under high load, and contributes to downsizing of treatment facilities and improvement of operation efficiency. This has a remarkable effect.

[0016] Moreover, in particular the present invention, since the water is injected to cause a vortex flow in the tank while entrainment of oxygen of the upper part the tank from the nozzle portion, entrained oxygen vortex
It rotates together with the air, enabling aeration to the deep water layer, enhancing the effect of introducing and diffusing oxygen, and greatly improving the dissolving efficiency. it is possible to greatly increase the amount of fine bubbles in the water at the time-released.

In particular, in a general pressurizing apparatus, air is dissolved at a high pressure in the pressurizing tank of 4 to 8 kg / cm ² , whereas in the present invention, the pressure in the tank is reduced by the mixing of air by the vortex. Sufficient dissolution efficiency can be obtained even at a relatively low pressure of 2-3 kg / cm ² . That is, since gas-liquid dissolution can be performed at the above low pressure, the same power consumption results in 5 kg / cm ² ··· 50 l / min with a 2.2 kW pump and ² kg / cm ² ··· 150 l / min. In addition, it is possible to greatly reduce the power consumption with respect to the discharge amount.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an apparatus used for a pressurized oxygen dissolution method of water according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pressurizing pump 1a Water pipe 1b Nozzle part 2 Pressurizing tank 3 Compressor 3a Vent pipe 4 Oxygen cylinder 4a Vent pipe 5 Water level detection sensor 6 Pressure gauge 7 Solenoid valve 8 Pressure regulating valve 9 Regulator 10 Oxygen flow meter P Pool

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B01F 1/00-5/26 C02F 1/24

Claims (1)

(57) [Claims] 1. Water pumped by a pressurizing pump or the like is put into a pressurized tank, and pressurized oxygen is supplied into the tank to dissolve the oxygen in water under a pressurized state. By releasing the dissolved oxygen into fine bubbles by releasing the bubbles, the pressurizing tank is formed into an upright cylindrical shape when the oxygen of the bubbles is dissolved in water by floating the fine bubbles in water. A nozzle for spraying the water in a tangential direction of the tank from obliquely above the liquid level is disposed above the outer peripheral portion in the pressure tank , and the water sprayed from the nozzle portion entrains oxygen in the upper portion of the tank. while rotating in a tank to generate a vortex stream comprising oxygen in the pressure tank
Pressurized oxygen dissolution method of by rolling oxygen wherein Rukoto dissolved in water.