JP3156173B2 - Pressurized floating purification device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for dissolving oxygen in water by, for example, dissolving air by pressurizing air in sewage, releasing the sewage to the atmosphere, and taking out the dissolved air as fine bubbles. The present invention relates to a pressurized flotation purification device that flotates and separates dirt in water with these bubbles.

[0002]

2. Description of the Related Art In carrying out water treatment, there is generally known a pressurized flotation purification method in which a large amount of fine bubbles are generated in water to be treated, and the fine bubbles are brought into contact with water to perform flotation separation.

[0003] As an apparatus for purifying the pressure flotation, pumped water is put into a closed tank, and 3
By supplying pressurized air of about 5 kg / cm ² , this air is dissolved in water, while the water in which this air is dissolved is released to the atmosphere to make the dissolved air fine bubbles, thereby removing dirt in the water. What is taken out together with fine bubbles is well known.

[0004]

However, in the above-mentioned conventional pressurized floating purification device, the efficiency of dissolving air is poor due to poor stirring and mixing efficiency in the pressurized tank.
As a result, the amount of generated fine bubbles is reduced, and there are problems such as a decrease in flotation separation capability and a decrease in oxygen supply capability to wastewater.

[0005] The present invention addresses the above-mentioned situation and improves the dissolving efficiency of the air by performing aeration in a state in which a vortex is generated in the pressurizing tank, thereby improving the water treatment plant. It is intended to be small and low cost.

[0006]

That is, a feature of the pressure flotation purification apparatus of the present invention that meets the above-mentioned object is that water pumped by a pressure pump or the like is put into a tank for pressurization, and pressurized air is introduced into the tank. While the air is dissolved in water by supplying the air, the water is released to the atmosphere to form the dissolved air into fine bubbles, and the dirt in the water is removed together with the bubbles. A nozzle that forms a tank in an upright cylindrical shape and injects water in the tangential direction of the tank from above the liquid level to the upper part of the outer periphery of the pressurizing tank, and generates a vortex in the tank using the injected water. The part is formed.

Further, in the purifying apparatus of the present invention, it is possible to further increase the stirring effect by forming a stirring plate extending substantially in the radial direction of the tank and partially preventing a vortex. to the water ejected from the nozzle portion, it is also preferable to mix pressurized at a pressure of ^{3kg / cm 2 ~5kg / cm 2} .

[0008]

In the purifying apparatus of the present invention, since the water is injected from the nozzle portion so as to cause a vortex into the tank while entraining the air in the upper part of the tank, it is possible to aerate to a deep layer of the water to form bubbles. The introduction and diffusion effect can be enhanced, and the dissolution efficiency of air can be greatly improved compared to the past, thereby supplying oxygen to wastewater with high efficiency,
This makes it possible to greatly increase the amount of microbubbles in water at the time of opening to the atmosphere.

[0009]

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

FIG. 1 is a block diagram showing a pressurized floating purification apparatus according to an embodiment of the present invention. In FIG. 1, 1 is a pool of water before treatment, 2 is a depressurizing tank, 3 is a pressurizing pump, and 4 is a pressurizing pump. The tank 5 is a pool of water after treatment, and S is a control panel.

The depressurizing tank 2 includes a vacuum pump 6 for depressurizing the water in the tank 2 and degassing a gas previously dissolved in the water. A sensor 9 and a water level sensor 10 are provided.

The pressure reducing valve 7 controls the amount of gas to be removed from the tank 2 and the overall flow rate by adjusting the degree of vacuum in the pressure reducing tank 2. The above vacuum pump 6
By discharging gas accumulated in the upper portion of the tank 2, gas having a higher dissolution rate than air (oxygen) can be removed from water, and the dissolution rate of air in the next step can be increased. The water level sensor 10 controls ON / OFF of the vacuum pump 6, and the pressure sensor 9 measures the degree of vacuum in the tank 2 and detects abnormal pressure.

On the other hand, the pressurizing tank 3 includes a nozzle portion 11 formed at a water outlet following the pressurizing pump 3, an air compressor 12, a pressure sensor 13, and a water level sensor 14. Also, this pressurizing tank 4
A pressure release valve 15 for discharging pressurized water to the pool 5 and an automatic drainage valve 16 for discharging drain are provided at a lower portion of the pool.

The nozzle portion 11 is installed near the outer periphery of the pressurizing tank 4 provided in a cylindrical shape, and injects water from above the liquid level obliquely downward in the tangential direction of the tank 4. Thus, a vortex is generated in the water in the tank 4. Water is the injection is pressurized to 3kg / cm ² ~5kg / cm ² by the pressure pump 3.

In the pressurizing tank 4, three agitating plates 17 are fixed radially to the outer peripheral portion of the tank 4 so as to be orthogonal to the vortex. Increases the stirring effect. Further, a rod-shaped permanent magnet 18 is installed at the center of the pressurizing tank 4 with an upper N pole and a lower S pole. That is, by rotating the water jetted from the nozzle portion 11 around the magnet 18 in the tank 4, the water and the air are more easily dissolved under the influence of the magnetic field.

In the nozzle section 11 and the stirring plate 17, the air in the upper portion of the tank 4 is jetted from the nozzle section 11 so as to generate a vortex into the tank 4 while being entrained, and the vortex is mixed by the stirring plate 17. That is, the vortex and the stirring plate 1
By using in combination with 7, it is possible to efficiently mix and dissolve air and water without requiring any other power.

The air compressor 12 sends pressurized air into the pressurizing tank 4, and the water level sensor 14 detects a water level to detect the water level.
2 ON / OFF control is performed. And pressure sensor 1
The automatic drain valve 16 measures the pressure to detect the presence or absence of abnormal pressure, and the automatic drain valve 16 periodically drains the water to prevent adhesion of foreign matter in the pressurizing tank 4 and discharge dust and the like. Have.

Further, the pressure release valve 15 supplies pressurized water in which air is dissolved at a high concentration from the pressurizing tank 4 to the pool 5.
To generate fine bubbles in the pool 5 from the pressurized water having a large amount of dissolved oxygen.

Finally, the control panel S is operated by a timer.
Pressurizing pump 3, vacuum pump 6, air compressor 1
2. Automatic operation and ON / OFF control of the automatic drain valve 16 are performed. The pressure sensors 9 and 13 automatically stop the operation of the entire apparatus when abnormal pressures are detected in the tanks 2 and 4, respectively.

In the pressurized levitation purifying apparatus according to the embodiment of the present invention, first, 200 to 70
The gas dissolved in the water is removed by degassing under reduced pressure at a degree of vacuum of 0 mmHg. It is thought that gas molecules are in gaps between water molecules, but with conventional pressure / aeration, gas molecules that are dissolved first are pushed out and oxygen or the like is put into this gap. Inefficient. For example, if oxygen is 1 in a ratio of dissolving in water, ammonia is 3000.

Next, the deaerated water is pressurized and mixed with air. In this case, since the gas is easily dissolved in the liquid under pressure according to Henry's law, in the process of degassing to pressurizing, it is possible to increase the amount of dissolved oxygen in the water with high efficiency which is much higher than the conventional one. In this case, by mixing water and air in the pressurizing tank 4 by using the vortex generated by the nozzle portion 11 and the stirring plate 17, the amount of dissolved oxygen in the water can be more efficiently increased. is there.

By the way, when the efficiency of dissolving air is increased by degassing, the residence time of water in the pressurized tank 4 is usually 1.5 times.
２2 minutes, the time is reduced and the pressure tank 4
Can be reduced in size. Also, the pressure is usually 3
It is said to be ５5 kg / cm ² , but it is possible to lower the pressure. In the above process, if the air compressor 12 is turned ON / OFF by detecting the water level in the pressurizing tank 4, it is not necessary to adjust the amount of dissolved air, and the pressure can be adjusted by opening and closing the open valve. The pressure can be arbitrarily set within the capacity of the pressure pump 3 without being affected.

By opening the pressure release valve 15 of the pressurizing tank 4 and releasing the pressurized water to the pool 5, a large amount of fine bubbles are generated in the water, and the dirt floats and separates with the floating of the bubbles. This makes it possible to remove this dirt from the water.

While the embodiment of the present invention has been described above, the depressurizing tank 2 may be configured to also serve as the pressurizing tank 4 in addition to being provided independently as in the embodiment. It is also preferable to attach a deodorizer 19 for deodorizing the degassed gas to the depressurizing tank 2 as necessary, and to attach a check valve 20 to the duct of the pool 1 if necessary.

[0025]

As described above, the pressurized floating purification device of the present invention has an air pressurizing tank formed in an upright cylindrical shape, and an upper portion of the outer peripheral portion of the pressurizing tank is provided with an upper liquid level. From the tank in the tangential direction of the tank, and the injected water forms a nozzle that generates a vortex in the tank.Water from the nozzle into the tank while entraining the air above the tank Injected so as to create a vortex, it enables aeration to the deep layer of water and enhances the effect of introducing and diffusing air bubbles, greatly improving the dissolution efficiency of air compared to the past, and thereby enabling high efficiency in wastewater By supplying oxygen and increasing the amount of microbubbles at the time of opening to the atmosphere, the recovery rate of dirt is improved, and as a result, the remarkable effect of providing a smaller and lower cost water treatment plant than the conventional system is achieved. It is intended to.

Further, by using the vortex and the stirring plate together, it is possible to more efficiently mix the water and the air without requiring any other power.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a pressure flotation purification apparatus according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pool 2 Decompression tank 3 Pressure pump 4 Pressure tank 5 Pool 6 Vacuum pump 7 Pressure reduction valve 8 Flow meter 9 Pressure sensor 10 Water level sensor 11 Nozzle part 12 Air compressor 13 Pressure sensor 14 Water level sensor 15 Pressure release valve 16 Automatic Drain valve 17 Stir plate 18 Permanent magnet 19 Deodorizer 20 Check valve

Claims (3)

(57) [Claims] 1. The water pumped by a pressurizing pump or the like is put into a pressurizing tank, and pressurized air is supplied into the tank to dissolve the air in the water, while releasing the water to the atmosphere. In a pressurized flotation purification device for forming dissolved air into fine air bubbles and removing dirt in water together with the air bubbles, the pressurizing tank is formed in an upright cylindrical shape, and a liquid level is formed on an upper peripheral portion of the pressurizing tank. A pressurized flotation purification apparatus characterized in that water is jetted from above the tank in a tangential direction of the tank, and a nozzle portion for generating a vortex in the tank is formed by the jetted water. 2. The pressurized flotation purification device according to claim 1, wherein a stirring plate extending in a substantially radial direction of the tank is formed in the pressurizing tank. 3. The water jetted from the nozzle portion,
3kg / cm ² ~5kg / cm floatation on purification system of a pressurized claim 1 or 2, wherein a pressure of ^2.