KR102664947B1 - Micro-nano bubble generating device with pressure turning method applied - Google Patents

Abstract

The present invention relates to a micro-nano bubble generating device using a pressurized swirling method that improves water quality and purifies water quality using fine bubbles with small bubble diameters.
One embodiment of the micro-nano bubble generating device using the pressurized swirling method disclosed herein is a device for generating fine bubbles for purifying water in a water tank, comprising a pump that provides power to circulate the water; A compressor that provides gas for generating the fine bubbles and a fine bubble generating device provided in the water tank and connected to the pump and the compressor to generate fine bubbles to levitate contaminants present in the water; , the fine bubble generator forms a flow path through which gas moves while rotating the water provided from the pump, and at the nozzle end of the fine bubble generator, the flow path is sheared by the rotational speed difference of the water to generate fine bubbles. It can be characterized as generating.

Description

Micro-nano bubble generating device with pressure turning method applied}

The present invention relates to a micro-nano bubble generating device using a pressurized swirling method that improves water quality and purifies water using fine bubbles with small bubble diameters.

Due to population growth and industrialization, the demand to utilize lakes and rivers as water is rapidly increasing. However, industrialization and urbanization have had the opposite effect and have increased the pollution load on water resources, and the resulting water pollution is worsening.

In particular, in the case of rivers and rivers, the level of pollution continues to increase due to the environment in which discarded pollutants are inevitably concentrated.

In addition, due to the characteristics of Korea's climate, rain falls heavily in the summer, and many dams were built to secure this concentrated rain as water resources, resulting in the creation of a proportionate number of large lakes.

Artificial lakes created in this way to secure water resources have a long hydraulic residence time and become stagnant water areas, so the concentration of nutrients such as nitrogen and phosphorus generally increases while organic matter is low.

Due to the characteristics of the lake, which provides an appropriate environment and abundant nutrients for the growth of algae in the lake, excessive algae growth and enrichment are emerging as serious environmental problems, and fundamental measures are needed to address these causes.

The problem caused by the rapid growth of algae in the lake is not only the coloring of the water source, but also the taste and odor caused by extracorporeal enzyme secretion, which can cause civil complaints. When this is linked to the chlorine disinfection in the water treatment process, the highly toxic trihalomethane (trihalomethane) THMs) can form, threatening the health of citizens who use them as a source of drinking water. The excessive occurrence of these algae causes coagulation and sedimentation in addition to economic losses such as increased maintenance costs due to deterioration of mechanical equipment and piping and mechanical functions during the water purification process. It acts as a serious obstacle to the water treatment system by increasing backwashing due to obstruction, closure of the filter, or shortening of the filter duration, causing significant damage to the maintenance of the existing treatment system.

Common countermeasures for this include a method of spraying red clay to remove algae generated in freshwater lakes and letting it settle to the bottom of the water, and a method of attaching a fine air generator to the bottom of the water and then removing the algae by levitating it with fine air. A method of killing by spraying heavy metals such as copper solution (Cu2+), a method of killing by a disinfectant such as sodium hypochlorite (NaClO), a method of removing using inorganic oxides such as zeolite, and a method of killing by aerosol. There are methods of collecting birds by physical methods after they are injured by birds, and methods of cultivating natural enemy microorganisms and then spraying them, but most methods use sedimentation with a spoon, which is the most widely used method. For economic reasons, a method of spreading red clay powder to adsorb algae and allow it to settle at the same time is being used.

However, the method of spreading red clay powder to adsorb algae and allow it to settle at the same time has a high possibility of secondary water pollution due to sedimentation of the red clay powder to which algae are adsorbed, raising the risk of destroying the water ecosystem.

In addition, a method is being used to remove algae by attaching a fine air generator to the bottom of the spoon and then floating the algae with the fine air. However, in this case, algae removal is only possible in a local water area, so there is a limit to removing algae generated in a wide water area. In the case of killing methods using disinfectants such as sodium hypochlorous acid (NaClO), there is a problem that microorganisms beneficial to the water ecosystem can be killed by hypochlorous acid, and removal using inorganic oxides such as zeolite In the case of this method, problems similar to conventional red clay may occur because it settles in water.

As a technology for a device that generates fine bubbles, Patent Publication No. 10-2013-0009318 (fine bubble generating device using solid seawater based on a swirling unit) has been conceived.

Referring to Figure 1, the prior art includes a valve 110, a flow meter 120, a feed pump 130, a venturi injector 140, a turning unit 150, a separation chamber 160, a dissolution tank 170, It consists of a nozzle unit 180.

According to this prior art, gas and water are mixed through the venturi injector 140, and the dissolved water mixed with gas and water is supplied to the turning unit 150 and rotated to further increase the solubility of the gas, and the turning unit (150) The dissolved water flowing out from 150) passes through the separation chamber 160 and flows into the dissolution tank 170.

In the dissolution tank 170, the dissolved water and the unmixed gas are separated, the gas is discharged to the outside, and only the dissolved water is supplied to the nozzle unit 180, and the dissolved water is sprayed through the nozzle unit 180, Fine bubbles are created.

Here, the gas and dissolved water flowing into the dissolution tank 170 are separated from the top and bottom, and the gas collects in the upper part of the dissolution tank 170. When the gas pressure continues to increase and exceeds the standard value, the dissolution tank 170 The pressure in the dissolution tank 170 is maintained constant by opening the vent 175 provided at the top, that is, the valve device.

Therefore, according to the prior art, dissolved water is generated by swirling the water and gas introduced through the swirling unit 150 to collide with each other, and then discharging the dissolved water into the water through the nozzle unit 180 to form fine bubbles. By generating , the production rate of fine bubbles can be improved compared to the amount of water and gas used.

Meanwhile, in this prior art, as shown in FIG. 2, the turning unit 150 receives the mixture (f1) of water and air flowing out from the venturi injector 140, rotates it, and rotates the turned mixture (f2). A rotating body 151 that receives the mixture of water and air through the inlet 153, which serves to discharge the mixture into the separation chamber 160, and a rotation guide that mixes the introduced water and air while rotating ( 159) and a dissolved water discharge unit 155 that discharges the mixed pressure of water and air.

Here, the inlet portion 153 is formed in the tangential direction of the rotating body 151, and the dissolved water discharge portion 155 is formed on one side wall on the longitudinal central axis of the rotating body 151, and the inlet portion 153 The area is provided with a connector 156 that supplies water and air to the inlet 153.

The rotation guidance guide is composed of a pipe-shaped first guide wall and a second guide wall. One end of the first guide wall (159a) surrounds the dissolved water discharge portion (155) area and the dissolved water discharge portion (155) It is fixed to one inner wall surface of the orbiting body 151, and the other end is spaced apart from the other inner wall opposite to one inner wall of the orbiting body 151 on which the dissolved water discharge portion 155 is formed.

The second guide wall (159b) is disposed on the radial outer side of the first guide wall (159a) and is spaced apart from the first guide wall (159a), and one end of the second guide wall (159b) is formed with a pivoting portion where the dissolved water discharge portion (155) is formed. It is fixed to the other inner wall surface opposite to one inner wall surface of the main body 151, and the other end is spaced apart from one inner wall surface of the rotating main body 151 on which the dissolved water discharge portion 155 is formed.

Therefore, according to this prior art, the water and air flowing into the swing body 151 through the inlet 153 are between the guide wall 159b and the inner peripheral surface of the swing body 151, and the second guide wall 159b. ) and the first guide wall (159a), and while moving inside the second guide wall (159b), they rotate strongly and collide with each other to generate dissolved water of high solubility, and the generated dissolved water is generated at the dissolved water discharge unit (155). ) is discharged through.

According to the prior invention of this pressurized dissolution type, a high-pressure pump or multi-stage pump is applied, which consumes a lot of power to generate high-density microbubbles, so it is suitable for small-capacity water purification (laboratories, bathtubs, and washing devices), and is suitable for large-capacity water purification and sewage treatment. It is ineffective for water purification.

In addition, the flow may be blocked frequently due to foreign matter being caught in the structure of the guide wall and rotating body for the generation of dissolved water, and in the process of generating dissolved water, insoluble gases are not properly separated from the dissolved water and are mixed together. If it is maintained in this state, there is a problem in that the flow of dissolved water is not smooth in the passage leading from the turning unit to the separation chamber to the dissolution tank, which may cause pulsation phenomenon.

Therefore, the present invention aims to solve the above-mentioned problems.

One of the various tasks of the present invention is to provide a micro-nano bubble generating device using a pressurized rotation method that is free from clogging by foreign substances and can increase the amount of microbubbles generated compared to the same power.

One of the various tasks of the present invention is to provide a micro-nano bubble generating device using a pressurized rotating method that can reduce power consumption by eliminating clogging of foreign substances and allowing easy contact with oxygen in wastewater through the shearing and rotating method.

One of the various tasks of the present invention is to provide a micro-nano bubble generating device using a pressurized swirling method that can increase the amount of dissolved oxygen by generating appropriate bubbles depending on the contaminant.

Various embodiments for solving the problem of the present invention include a device for generating fine bubbles for purifying water in a water tank, a pump providing power for circulating the water, and a gas for generating the fine bubbles. A compressor that provides and a fine bubble generating device provided in the water tank and connected to the pump and the compressor to generate fine bubbles to levitate contaminants present in the water, the fine bubble generating device comprising: Pressurization, characterized in that it forms a flow path through which gas moves while rotating the water provided from the pump, and generates fine bubbles by shearing the flow path at the nozzle end of the fine bubble generating device due to a difference in rotational speed of the water. A micro-nano bubble generating device using a rotating method is provided.

The fine bubble generator may be connected to the pump and the compressor so that the direction in which water is provided from the pump and the direction in which gas is provided from the compressor are perpendicular to each other.

The gas provided from the compressor may move along a flow path formed in the central portion as the water provided from the pump rotates.

It may further include a sensor provided in the water tank to measure the degree of contamination of the water, and a control unit that adjusts the size of fine bubbles generated by the fine bubble generator according to the degree of contamination of the water measured by the sensor.

The control unit may control the diameter of the fine bubbles to 2 to 80 μ (microns).

The sensor is a sensor that measures dissolved oxygen in the water, and the control unit generates a smaller diameter of the fine bubbles to increase the levitation speed of contaminants present in the water when the dissolved oxygen in the water is low. The bubble generator can be controlled.

It may further include a pressure gauge connected between the pump and the fine bubble generator and a flow meter connected between the compressor and the fine bubble generator, and values measured by the pressure gauge and the flow meter may be transmitted to the control unit.

Each feature of the above-described embodiments may be implemented in combination in other embodiments as long as it is not contradictory or exclusive to other embodiments.

According to various embodiments of the present invention, by applying the pressurized shear and turning method, there is no clogging of foreign substances and the effect of improving water quality can be increased by increasing the amount of microbubbles generated compared to the same power.

In addition, it is suitable for wastewater treatment with a lot of foreign substances, such as large-capacity water purification and sewage water quality purification, and effective water quality improvement can be expected by generating microbubbles of an appropriate size depending on the amount of dissolved oxygen in the wastewater.

The effects of the present invention are not limited to those described above, and other effects not mentioned will be clearly recognized by those skilled in the art from the description below.

Figure 1 is a diagram showing a micro/nano bubble generating device using a pressure swirling method according to an embodiment of the present invention.
Figures 2 and 3 are diagrams showing configurations for generating fine bubbles in Figure 1.
Figure 4 is a diagram showing a fine bubble generating device according to an embodiment of the present invention.
Figure 5 is a diagram showing an embodiment of the fine bubble generating device of Figure 4.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. The detailed description below is provided to facilitate a comprehensive understanding of the methods, devices and/or systems described herein. However, this is only an example and the present invention is not limited thereto.

In describing the embodiments of the present invention, if it is determined that a detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. In addition, the terms described below are terms defined in consideration of functions in the present invention, and may vary depending on the intention or custom of the user or operator. Therefore, the definition should be made based on the contents throughout this specification. The terminology used in the detailed description is only for describing embodiments of the present invention and should in no way be limiting. Unless explicitly stated otherwise, singular forms include plural meanings. In this description, expressions such as “comprising” or “comprising” are intended to indicate certain features, numbers, steps, operations, elements, parts or combinations thereof, and one or more than those described. It should not be construed to exclude the existence or possibility of any other characteristic, number, step, operation, element, or part or combination thereof.

Additionally, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the nature, sequence, or order of the component is not limited by the term.

FIG. 1 is a diagram showing a micro-nano bubble generating device using a pressurized swirl method according to an embodiment of the present invention, and FIGS. 2 and 3 are diagrams showing configurations for generating fine bubbles in FIG. 1.

Hereinafter, the description will be made with reference to FIGS. 1 to 3.

The microbubbles of this embodiment refer to ultra-fine bubbles of 50 ㎛ or less, and the microbubbles are reduced to nanobubbles with a diameter of 10 ㎛ or less due to internal contraction, then generate high-temperature, high-pressure ultrasound and free radicals and crush and disappear. In other words, microbubbles become nanobubbles and collapse and disappear.

The micro-nano bubble generating device using the pressurized swirling method of this embodiment is a device for generating fine bubbles for purifying water in a water tank, and includes a control unit 10, a pump 20, a compressor 30, and a fine bubble. It may include a generator 100 and a DO sensor 60.

To explain the principle of the fine bubble generator 100, the solid material flotation method involves solid material being attached to fine bubbles, and the attached solid material floating to the water surface due to the difference in buoyancy with water, ultimately causing suspended solids to form on the water surface. It is a principle of concentration.

The fine bubble generator 100 uses the principle of dispersing ultrafine bubbles of an ionized double membrane in wastewater, causing contaminants such as suspended solids to instantly coagulate and attach to the bubbles, separating solid and liquid, and then floating on the water surface and purifying water. .

This fine bubble generating device (100) is formed of a double membrane containing invisible fine bubbles (25 microns) and 40% to 65% of air per volume, so the adhesion of suspended solids (SS) and levitation speed are fast. , has a removal rate of over 99%.

The fine bubble generating device 100 is a flotation process that separates solid and liquid in a static state by arbitrarily adjusting the size of the bubbles according to the nature and type of wastewater in a stable emulsion of fine bubbles dispersed in water.

The control unit 10 can control the size of the diameter of fine water droplets generated through the fine bubble generating device 100. The control unit includes a sensor 60 that measures dissolved oxygen in the water 51 in the water tank 50, a compressor 30 that provides gas to generate fine bubbles, and a pump 20 that provides power to circulate the water. In conjunction with , the generation size of fine bubbles can be controlled depending on the dissolved oxygen in the water 51.

More specifically, the average size of bubbles generated by the fine bubble generator 100 through the control unit 10 is preferably 25 μ (microns). This is because, according to Stokes theory, a 25μ (microns) bubble has a levitation speed of 0.2cm/sec (0.12m/min per minute), so the average size of the microbubbles generated through the microbubble generator 100 is 25μ (microns). In one case, nanobubbles with a diameter of 10μ or less can be effectively created through internal contraction.

And the control unit 10 of this embodiment can control the diameter of fine bubbles to 2 to 80 μ (microns) depending on the dissolved oxygen in the water 51. In this case, the number of bubbles generated is about 60 billion/l, The surface area of the bubble is 1,200,000㎠/ℓ, Recycle ration is 2.5~5% (flow rate), Available Flotation Air is 40~65% (by volume), and Operating Aeration Pressure is 1~1.5 ㎏/㎠.

In particular, Operating Aeration Pressure showed a difference of about 4 times under the same conditions compared to the existing DAF (Dissolved Air Flotation), which can increase the amount of micro bubbles generated compared to the same power as described above, resulting in more effective water quality improvement. You can expect it.

More specifically, in the case of DAF, it is used to treat fine solids with low specific gravity, but the floc is destroyed due to fluctuation when pressurized water is injected, and the fine bubbles (80 microns) are supersaturated by circulating water in air with a pressure of 4 to 5 kg/cm2. It is created in this state and operated at this pressure.

The flotation ability is determined by the solubility of air in the water. Since only about 3 to 5% of the air is dissolved, about 50 to 200% of the throughput of circulating water is required to provide the required air volume, which may increase the power cost and reduce the flotation ability. there is.

On the other hand, the micro-nano bubble generator using the pressurized swirling method of this embodiment separates solid and liquid in a static state by generating various micro bubbles with a trace amount of surfactant depending on the nature and type of wastewater, and the micro bubbles (25 microns) are It is made according to physical and chemical controls and operates at a pressure of 1 to 1.5 kg/cm2.

And since it contains about 40 to 65% of air per volume, the surface area is 30 times that of DAF, so the amount of air required is small, requiring only 2.5% to 5% of circulating water.

This embodiment may further include a member 40 provided in the water tank 50 to prevent foreign substances from entering the fine bubble generating device 100. The member 40 includes a plurality of holes 41 and can effectively filter foreign substances.

The fine bubble generating device 100 of this embodiment applies a shear-and-turn method to structurally prevent clogging of foreign substances inside the fine bubble generating device 100, and also prevents the member 40 from being blocked. By applying this method, foreign substances can be prevented from flowing into the fine bubble generating device 100.

Referring to FIG. 2, the fine bubble generator 100 of this embodiment may be connected to a flow path (a) that receives gas from the compressor 30 and a flow path (w) that receives water circulated from the pump. A flow meter 31 may be provided on the flow path (a), and a pressure gauge 21 may be provided on the flow path (w). The values measured through the flow meter 31 and the pressure gauge 21 are transmitted to the control unit 10 to control the size of the micro bubbles generated through the above-described fine bubble generator 100.

FIG. 4 is a diagram showing a microbubble generating device according to an embodiment of the present invention, and FIG. 5 is a diagram showing an embodiment of the microbubble generating device of FIG. 4 .

Hereinafter, it will be described with reference to FIGS. 4 and 5.

The fine bubble generating device 100 of this embodiment may include a first connection part 101, a second connection part 103, a nozzle body 110, and a nozzle end 130.

The first connection part 101 is connected to a flow path through which water (w) provided from the pump 20 flows, and the second connection part 103 is connected to a flow path through which gas (a) provided from the compressor 30 flows. You can.

The water (w) provided from the pump 20 rotates within the nozzle body 110 to form a flow path 113 through which the gas (a) moves in the central part, and at the nozzle end 130 of the fine bubble generator. The flow path 113 may be sheared due to the rotational speed difference generated as the water rotates, thereby generating fine bubbles (b).

As described above, in order to effectively rotate the incoming water (w) within the nozzle body 110 and effectively form the flow path 113 in the central portion, the direction in which the water (w) is provided from the pump 20 is the nozzle body ( A direction perpendicular to 110) is preferable.

In addition, the fine bubble generator 100 is configured so that the direction in which water (w) is provided from the pump 20 and the direction in which gas (a) is provided from the compressor 30 are perpendicular to each other. can be connected with

More specifically, the gas (a) provided from the compressor 30 may move along the flow path 113 formed in the central portion as the water (w) provided from the pump 20 rotates at high speed.

In the above-described structure, the nozzle end 130 can generate fine bubbles (b) by shearing the flow path 113.

Although various embodiments of the present invention have been described in detail above, those skilled in the art will understand that various modifications can be made to the above-described embodiments without departing from the scope of the present invention. . Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the claims and equivalents of the claims as well as the claims described later.

10: control unit 20: pump
30: Compressor 100: Fine bubble generator

Claims (7)

In a device for generating fine bubbles for purifying water in a water tank,
a pump that provides power to circulate the water;
A compressor providing gas for generating the fine bubbles;
A sensor provided in the water tank to measure dissolved oxygen in the water;
a fine bubble generator provided in the water tank and connected to the pump and the compressor to generate fine bubbles to levitate contaminants present in the water; and
A control unit that adjusts the size of fine bubbles generated by the fine bubble generator according to the dissolved oxygen in the water measured by the sensor,
The fine bubble generator is,
a nozzle body connected to the pump and the compressor through a flow path;
a nozzle end formed at one end of the nozzle body;
a second connection part provided at the other end of the nozzle body and connecting the nozzle body to a flow path through which gas supplied from the compressor flows; and
A first connection part is provided at a right angle to the second connection part at the end of the nozzle and connects the nozzle body with a flow path through which water provided from the pump flows,
The first connection part and the second connection part are connected to the nozzle body so that the direction in which water is provided from the pump and the direction in which gas is provided from the compressor are perpendicular to each other,
The water provided from the pump circles the inside of the nozzle body along the inner surface of the nozzle body, forming a flow path in the central part of the nozzle body through which gas moves along the longitudinal direction of the nozzle body,
The passage through which the gas moves is sheared at the end of the nozzle due to a difference in rotational speed of water provided from the pump, thereby generating fine bubbles,
The control unit controls the fine bubble generator to generate a smaller diameter of the fine bubbles in order to increase the rate of levitation of contaminants present in the water when the dissolved oxygen in the water is low. Pressure turning method, characterized in that This applied micro-nano bubble generating device. delete According to paragraph 1,
The gas provided from the compressor moves along a flow path formed in the central portion while the water provided from the pump rotates. A micro/nano bubble generating device using a pressurized swirl method. delete According to paragraph 1,
The control unit is a micro-nano bubble generating device using a pressurized rotation method, characterized in that the diameter of the fine bubbles is controlled to 2 to 80 μ (microns). delete According to clause 5,
A pressure gauge connected between the pump and the fine bubble generator and
It further includes a flow meter connected between the compressor and the fine bubble generator, wherein the values measured by the pressure gauge and the flow meter are transmitted to the control unit.

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