KR101010729B1 - Micro-bubble generator, Wastewater disposal plant using the micro-bubble generator and method of disposing of waste water using the same - Google Patents

Abstract

The present invention relates to a microbubble generating device capable of generating microbubbles in water using the principle of cavitation, a wastewater treatment apparatus and a wastewater treatment method using the same.

To this end, the present invention provides a microbubble generating device including a housing having a space formed therein, and a cavitation generating unit provided in the housing to allow cavitation to be generated in a fluid introduced into the housing.

In addition, the present invention includes the micro-bubble generating device, a fluid inlet to allow the fluid to be purified into the interior of the housing, and the fluid discharged from the interior of the housing is accommodated, and includes an oxidative decomposition process and a floating separation process. Provided is a wastewater treatment apparatus and a wastewater treatment method comprising a reaction tank in which a process is performed.

Wastewater Treatment System, Cavitation, Blade, Dissolved Oxygen, Microbubbles

Description

Micro-bubble generator, Wastewater disposal plant using the micro-bubble generator and method of disposing of waste water using the same

The present invention relates to a microbubble generating device and a device using the same, and more particularly, a microbubble generating device for generating microbubbles by inducing cavitation generation, a wastewater treatment device for purifying wastewater using the microbubble generating device. And a processing method thereof.

In general, the conventional techniques for generating microbubbles have used Dissolved Air Flotation, Dispersed Air Flotation, or electrolysis and ultrasonic waves.

However, among the above methods, the dissolved air flotation method is used in the form of a combination of various devices such as a pump, a high pressure compressor, a pressure tank, a valve, a nozzle, and an acid pipe. Therefore, the microbubble generating device using the dissolved air flotation method has a problem of high initial cost and difficult maintenance. In addition, in the case of using an ultrasonic generator, the amount of bubbles generated is low and the efficiency is low.

Since the size of the bubble generated by the above-mentioned micro-bubble generating techniques is 40 µm or more and the particle size of the bubble is relatively large, deformation of the bubble easily comes. That is, in the early stage of the discharge of the bubble, there is a problem in that the bubbles are combined while maintaining the shape of the fine bubbles near the discharge point but moving in the water.

In addition, an air diffuser, an acid disk, or the like may be used as a device for generating microbubbles. Here, a mixture of water and air is pressurized to pass through the diffuser or disk of the micropores, there is a problem that clear water should be used.

In addition, the device for generating micro-bubbles using the gear pump is a principle of discharging the compressed gas-liquid mixture after crushing the bubbles by using the gear in the pressurizing unit by introducing air and water at the same time, the amount of bubbles is dissolved air It is similar to the flotation method, but a kind of cavitation phenomenon causes damage to the device and short life. In addition, there is a limitation that is generally used for small laboratory apparatus because there is a manufacturing difficulty when making the gear large.

On the other hand, the microbubble generating device currently widely used in the environmental industry, for example, in the case of a sewage treatment plant in the microbial reaction tank to install a diffuser and an diffuser disk and inject air into the high pressure compressor to aeration Can generate bubbles.

However, it is very difficult to evenly distribute the air compressed at high pressure through the diffuser, and the size of bubbles generated at this time has a size of several mm that can confirm that the air bubbles rise to the naked eye. In addition, the size of bubbles generated through the ceramic diffuser in the flotation tank is smaller than the size of bubbles generated in the microbial reactor, but is still 50 µm or more, and when the diffuser disc or the diffuser is applied, the distribution of bubbles is uneven and concentrated centrally. Due to the strong spraying, the floating separation is not even, so the efficiency is very low. In addition, if the bubble size is large, the oxygen dissolution rate is lowered, there is a disadvantage that the treatment efficiency is low in the biological reactor.

In addition, a technique for generating micro-bubbles using ultrasonic waves has a problem that the efficiency is low because the power consumption is small to generate ultrasonic waves, but the amount of bubbles generated is small. Therefore, the microbubble generating device using ultrasonic waves has a limitation that can be applied to small devices, such as mainly washing kitchen containers or laboratory equipment.

Looking at the necessity of micro-bubbles in the environmental industry, in the case of livestock wastewater and food waste leachate, which is difficult to control, it is generated more than the amount of domestic sewage. Small but pollutant load is very high.

In particular, in case of water pollution caused by nonpoint sources of pollutants discharged from large areas scattered here and there, livestock wastewater accounts for about 50% of the total load. .

To this end, various wastewater treatment methods are used, but conventional treatment methods are difficult to properly treat high-concentration wastewater with high pollutant load, and the process is difficult, requiring an environmental expert or a manpower with similar professional knowledge. If this is not the case, there was a problem that the damage caused by the immature operation of the device in the field or public treatment plant.

In addition, even if the amount of generated organic wastewater is less than the amount of domestic sewage, the high concentration of organic wastewater has a high pollution load, and if discharged without unauthorized treatment, the possibility of environmental pollution on public water is increased.

Although an activated sludge process is used to treat the high concentration organic wastewater, for example, a high concentration livestock wastewater, the active sludge process may have a maximum organic concentration (BOD) range of about 5,000 to about 5,000 ~. Limited to 10,000 ppm.

Therefore, when the concentration of solids contained in the inflow water is high or the viscosity is high, the oxygen dissolution rate is significantly lowered, the reaction time is prolonged about 2 to 3 weeks, there is a problem that the water treatment efficiency is also lowered.

In addition, when a large amount of organic (about 20,000 ~ 80,000ppm) wastewater including livestock wastewater or food waste leachate is treated by active sludge method through a large amount of oxygen supply, a large-capacity aeration device must be used, thereby increasing the cost of the apparatus. And there was a problem that the maintenance cost is also increased.

In addition, the characteristics of the activated sludge process generally require high concentrations of organic wastewater and oxygen, and high dissolved oxygen. However, when the treatment tank becomes large in size in the conventional activated sludge process, oxygen deficiency phenomenon occurs due to incomplete agitation due to the expansion of the treatment tank and deterioration of the oxygen dissolution rate in the organic medium having high solids and high viscosity. There is a problem that the treatment efficiency of the treatment process is lowered, and the treatment efficiency of the entire treatment process is extremely low.

In order to solve the problems of the micro-bubble generating technology as described above and the problems in the examples of using the micro-bubble generating device in the industrial field, the technical problem to be achieved by the present invention is a micro-bubble that can generate micro-bubbles with a simple equipment It is intended to provide a generator and a device in which the microbubble generator is used, for example, a wastewater treatment apparatus and a wastewater treatment method for improving water quality.

In order to achieve the object to be solved, the present invention is a microbubble generation including a housing having a space formed therein, a cavitation generating unit is provided in the interior of the housing so that the cavitation occurs in the fluid introduced into the housing Provide the device. Here, the bubbles generated by the cavitation generating unit may be crushed into fine bubbles due to the pressure difference with the outside of the housing.

The microbubble generating device may further include a microbubble generating unit in which a plurality of holes are formed to reduce the size of the bubbles while colliding or passing through the bubbles generated by the cavitation generating unit.

The microbubble generating device may further include a gas inlet connected to one side of the housing to allow gas to flow into the housing.

In addition, the present invention is a housing in which a space is formed therein, a fluid inlet portion connected to one side of the housing to purify the fluid to be introduced into the interior of the housing, provided in the interior of the housing inside the housing A cavitation generator for allowing cavitation to occur in the fluid; And it provides a waste water treatment apparatus comprising a reaction vessel in which the fluid discharged from the inside of the housing is accommodated and a process including an oxidative decomposition process and a floating separation process is performed.

Here, between the housing and the reaction tank, one end is further connected to the other side of the housing and the other end is connected to the reaction tank further comprises a discharge portion for guiding the fluid inside the housing to the reaction tank, The cross section of the discharge portion may be enlarged in the conveying direction of the fluid so that a pressure drop is induced to separate bubbles contained in the fluid into microbubbles.

The housing may be located inside the reactor.

In addition, the housing is open at the other side to allow the fluid to be discharged from the housing and flow into the reaction vessel, and when the fluid is discharged, a pressure drop is induced so that the bubbles contained in the fluid explode to form a fine device. The cross section of the housing may be enlarged in the conveying direction of the fluid so as to decompose into captive.

In addition, one side of the housing is further provided with a cavitation offset portion to protect the inner surface of the reaction tank by offsetting the explosive force while rotating by the explosive force generated when the bubbles contained in the fluid discharged from the housing is decomposed into fine bubbles Can be.

In addition, a reinforcing part may be further provided inside the housing to surround the cavitation generating part to block an explosive force generated when the bubble formed by the decompression of the fluid collapses, thereby preventing damage to the inner surface of the housing. have.

In addition, the present invention is a step of introducing a fluid to be purified into the interior of the housing through a fluid inlet connected to one side of the housing in which the space is formed, the fluid is generated by the cavitation generating unit provided inside the housing Generating bubbles by depressurizing and cavitation to generate bubbles; bubbles contained in the fluid are discharged from the housing and moved to a high pressure reaction tank to explode to form micro bubbles; and oxidative decomposition and floating by the fine bubbles It provides a wastewater treatment method comprising the step of performing a process including a separation process.

Effects according to the present invention are first divided into effects obtained in the microbubble generating device and the utilization portion using the same and a description thereof is as follows.

Looking at the effect on the micro bubble generator,

First, microbubbles can be generated using a single device utilizing the principle of cavitation. In other words, since it is possible to generate microbubbles without having complicated pipes and valves and various equipments such as a pressure generator and a mixing tank, it is possible to reduce costs for equipment and facilities. In addition, easy maintenance and low power consumption.

Second, bubbles generated by cavitation are formed into micro bubbles having a very small size. In particular, the bubbles generated by the pressure reduction of the fluid in the cavitation generating unit has a smaller size by breaking into micro bubbles due to the pressure difference with the outside. This is because the pressure difference between the depressurized state due to the increase in flow rate due to the high speed rotation in the cavitation generating unit and the pressure state in the external environment is significantly different from the prior art.

When such microbubbles are used in the water treatment process, the surface area of the bubbles becomes wider, so that the dissolution rate is improved to increase the activity of the microorganisms, thereby improving the water treatment efficiency.

Third, it is possible to apply to a wide range of industrial fields by generating a micro bubble with a very small bubble size. For example, when the microbubble is injected into the activated sludge tank for wastewater treatment, the dissolved oxygen concentration increases, and at the same time, the solids present in the microbial reactor are separated by the microbubbles so that the water treatment efficiency is further improved.

In addition, the conventional bubble generation technology has introduced a separate technology for maintaining an air dissolved state in which bubbles are dissolved in a liquid because the air must be transferred at a high pressure when attempting to inject air into a deep appeal or a deep jersey layer of a dam. It should be, but the microbubble generating device according to the present invention has an advantage that does not need a separate technology for supplying the bubble to the deep jersey layer by generating a microbubble is operated in the deeper portion.

Fourth, the technology for generating micro-bubbles by cavitation has the advantage that it can be installed anywhere in the water or the air for driving the microbubble generating device regardless of the installation location.

Fifth, the micro bubbles generated by cavitation can improve the navigation speed of the ship. In general, since the speed is reduced by the resistance of water in the case of a sailing ship, the frictional resistance by water can be remarkably reduced by the resistance by air by supplying microbubbles to the contact surface with water, which is the lower surface of the ship. This can save transit time through increased speed.

Looking at the wastewater treatment process as an example of the effect on the application of microbubble generation technology,

First, it is possible to achieve over-aeration in wastewater through economical method through cavitation generating part, and by amplifying it again, it is possible to amplify the dissolved rate of oxygen, which shortens the treatment time of wastewater and improves the treatment efficiency and high concentration of organic matter. Wastewater treatment is possible.

Second, by removing the solids and suspended solids contained in the waste water can increase the water treatment efficiency. The solids and suspended solids contained in the waste water in the reactor are floated and separated from the water as the microbubbles stick to each other, and the water quality is improved when the air bubbles and solids floated to the upper part are removed by the skimmer.

Third, the efficient aeration effect that bubbles are blown up to form micro bubbles, and the fluid in the reaction tank can be agitated by using the collapse force at this time, so that a separate stirring device is not required, thereby reducing the installation cost. Miniaturization is possible.

Fourth, by allowing a certain amount of air to be sucked at the same time while the fluid is sucked, since the supplied oxygen can be in contact with the fluid by the cavitation generating unit, dissolved without using a separate stirring device for contacting the fluid and oxygen The increase in oxygen can be made easily.

With reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above-described problem will be described.

1 is a schematic view showing the configuration of a wastewater treatment apparatus according to a first embodiment of the present invention, Figure 2 is a flow chart showing a wastewater treatment method according to a wastewater treatment apparatus according to a first embodiment of the present invention. Hereinafter, the contaminated water quality such as waste water and sewage is referred to as waste water.

As shown in Figure 1 and 2, the wastewater treatment device preferably comprises a housing 10, fluid inlet 20, discharge 80, cavitation generating unit 40 and the reaction tank (50). Do. Here, the housing 10 and the cavitation generating unit 40 installed inside the housing may form a micro bubble generator.

Preferably, the fluid inlet 20 is connected to one side of the housing 10, and the fluid to be treated is introduced into the housing 10 through the fluid inlet 20.

In addition, the cavitation generation unit 40 reduces the pressure by rotating the introduced fluid at a high speed so that cavitation can occur in the fluid introduced into the housing 10. By the cavitation phenomenon generated in this way, bubbles are generated inside the housing 10 without a separate gas supply from the outside. However, the gas inlet 30 is provided in FIGS. 1 and 2 in order to promote the bubble function generated by cavitation and to secure a sufficient amount of micro bubbles generated at the same time.

Here, gas, for example, air may be naturally introduced into the cavitation generating unit 40 through the gas inlet unit 30 from the outside. This is because the cavitation generation unit 40 is depressurized at the moment the fluid is transferred forward by the blade 45 of the cavitation generation unit, so that external gas can be sucked in. Because of this, a separate gas intake device is not required, so that the saving of parts can be achieved.

In addition, the fluid depressurized in the housing 10 generates bubbles, and the bubbles contained in the fluid are pulverized into a large amount of micro bubbles while being transferred to the reaction tank 50 having a high pressure through the discharge part 80, The amount of dissolved oxygen in the reactor 50 may be increased.

Further, since the agitation of the fluid in the reaction tank 50 can be made more smoothly by the explosive force generated when the bubbles are crushed into the micro bubbles, the wastewater treatment efficiency can be improved.

In detail, a predetermined space is formed inside the housing 10, and the housing is supported by the first lower support 90.

At this time, the housing 10 is not limited to any particular shape, but preferably may be formed in a cylindrical cylinder shape.

In addition, the fluid inlet 20 may be connected to one side of the housing 10 to allow fluid to be introduced into the housing 10.

Here, the fluid refers to a fluid to be purified or to be purified, waste water or sewage may be applied.

Therefore, the fluid inlet 20 may be installed such that the storage space 70 (eg, a storage tank) in which the fluid is stored is connected to the housing 10.

To this end, the fluid inlet 20 may include a pump 22 and a fluid inlet tube 24, even if the storage space 70 is installed lower than the housing 10. The fluid received in the storage space 70 by the pump pressure generated in the can be transferred to the inside of the housing 10 through the fluid inlet tube 24.

At this time, the connection of the fluid inlet tube 24 and the housing 10 should be sealed to prevent the leakage of the fluid, of course, the sealing may be made of a sealing member or welding.

In addition, the pump 22 may be formed of a conventional motor pump for generating a pumping force by converting electrical energy into power such as rotational energy.

On the other hand, the inside of the housing 10 is preferably provided with a cavitation generating unit 40 for generating a cavitation in the fluid introduced into the housing 10.

Here, the cavitation generating unit 40 is preferably formed in the form of a rotating body in order to form a vortex in the fluid accommodated in the housing 10 or to increase the flow rate.

And for this purpose, the cavitation generating unit 40 is preferably made to include a rotating shaft 42 and the blade 45.

Here, the rotating shaft 42 is preferably installed in the axial direction of the housing 10, the blade 45 is preferably provided in a spiral on the outer peripheral surface of the rotating shaft 42.

One end of the rotary shaft 42 is connected to the drive shaft 74 of the power generator 72 such as a motor, and the other end thereof is fixed to the housing 10 by the bearing 12.

Through this, the rotation shaft 42 may be rotated in conjunction with the drive shaft 74 that rotates by the rotational force provided by the power generating unit 72.

In addition, the portion in which the rotating shaft 42 penetrates the housing 10 may be sealed by a sealing member (not shown) to prevent leakage of the fluid contained in the housing 10.

The blade 45 is rotated in conjunction with the rotation shaft 42, wherein the blade 45 is rotated so that the fluid accommodated in the housing 10 is transported away from the fluid inlet 20 Is preferred.

In addition, the blade 45 to increase the flow rate of the fluid contained in the housing 10 to increase the dynamic pressure, but to reduce the static pressure of the fluid to form bubbles by the pressure reduction inside the fluid. It is preferable to rotate at a high speed so that cavitation (cavity) can occur substantially.

That is, the fluid contained in the housing 10 is moved forward by the high speed rotation of the blade 45 so that the fluid transfer amount dQ at a certain point (dx / dt) for a predetermined time is transferred to the housing 10. It is preferable to be larger than the fluid transfer amount dQ ₁ supplied, through which the cavitation can occur in the fluid contained in the housing 10.

Here, in order to allow the cavitation to occur substantially in the fluid inside the housing 10, the rotation of the rotation shaft is preferably at least 2400 rpm, and thus, the amount of fluid supplied from the pump 22 is the braid of the rotation shaft. Is less than the amount to transfer.

The pitch p and the width w of the blade 45 may be variously applied according to the size or shape of the housing 10 or the state of the fluid. For example, pitches of the blades may be formed at intervals of 10 to 150 mm so that a predetermined space is formed inside the housing.

The cavitation generating unit may include a fan or a propeller provided in at least one of the blades 45 in the longitudinal direction of the rotation shaft 42.

On the other hand, it is preferable that the gas inlet 30 is connected to one side of the housing 10 so that gas is supplied into the housing 10.

Here, the gas inlet 30 may be made of a pipe, one side is made to open to an external gas (preferably the atmosphere), the other side is preferably in communication with the housing 10. Do.

At this time, the connection between the gas inlet 30 and the housing 10 should be sealed so that the fluid contained in the housing 10 does not leak.

In addition, the inflow of gas (eg, air) through the gas inlet 30 may be performed by a decompression action by continuous transport of the fluid inside the housing 10.

In addition, the external gas sucked by this decompression phenomenon forms a high-speed vortex in the forward direction (fluid conveying direction) according to the rotation of the blade 45 to reduce the internal pressure inside the vortex, thereby maintaining Inhalation can be achieved.

Since the suction of the air may be made by the suction pressure inside the housing 10, a separate pressurization device may not be necessary for supplying air, and thus, parts may be reduced, thereby improving production economy. Can be.

In addition, the fluid inlet 20 is connected to the upper side of the housing 10, the gas inlet 30 is preferably connected to the lower side of the housing 10.

As a result, the fluid containing substances such as solid organic matter and suspended solids flows into the housing 10 and sinks downwards, and the air flows into the housing 10 and moves upwards. The mixing can be made more effectively.

In addition, when the solids and floats introduced into the housing 10 are discharged to the reaction tank together with the microbubbles through the discharge unit 80, the solids and the floats are drawn to the upper portion of the reaction tank by the flotation separation process of the microbubbles. . Then, the suspended solids suspended by the method using a skimmer or the like is removed to increase the water treatment efficiency of the reaction tank.

Each tube diameter of the fluid inlet tube 24 and the gas inlet 30 may be correlated with the fluid transfer amount of the cavitation generating unit 40 according to the rotational speed of the blade 45. Preferably, the ratio of the tube diameter of the fluid inlet tube 24 to the tube diameter of the gas inlet unit 30 may range from 1: 0.2 to 1: 1. However, in order for the pressure reduction phenomenon to occur by the blade rotating in the cavitation generating unit 40, the length of the cavitation generating unit needs to be sufficiently extended, and the diameter of the discharge unit 80 is sufficient to pressurized fluid by the rotation of the braid. It will have to be expanded to reduce the pressure. In addition, the discharge pipe is wound in the form of a coil so that the pressurized fluid accelerates as it exits the discharge port, and the number of turns may be about 2 to 3 times.

On the other hand, since the microbubbles generated by cavitation are generated under reduced pressure, the microbubbles are suddenly pulverized in the place where the pressure of the cavitation generating part is high. Due to the sudden internal collapse of the microbubble is a powerful explosion, the internal surface of the housing 10 by the explosion at this time to prevent damage such as wear or crack (crack) of the housing 10 is prevented It is preferable that the reinforcement 65 is further provided on the inside.

Here, the reinforcement portion 65 and the discharge portion 80 is preferably made of an elastic material (for example, rubber or urethane) to block or alleviate the explosive force that appears when the bubble is liquefied again. In other words, the reinforcing portion is to prevent the damage of the device generated during the micro-bubbling process by the cavitation is to cover the housing with a cushioning material that can absorb the breaking force.

The reinforcement part 65 may be manufactured separately and attached to be in close contact with the inner surface of the housing 10, or may be installed to have a predetermined distance from the inner surface of the housing 10, and may be disposed within the housing 10. It may be installed by surface treatment, such as directly coated on the side.

In addition, the reinforcement 65 is preferably provided not only inside the circumferential surface of the housing 10 but also inside both end surfaces of the housing 10.

On the other hand, the inside of the housing 10 may be further provided with a micro-bubble generating unit 60 to reduce the size of the bubbles formed in the fluid.

The microbubble generating unit 60 serves to prevent the generation of microbubbles irregularly by generating bubbles locally by the rotational force. In addition, the micro-bubble generating unit serves to ensure a predetermined size by crushing the bubbles generated due to the pressure reduction phenomenon of the fluid.

In addition, the micro-bubble generating unit 60 serves to crush the gas introduced through the gas inlet 30 into a bubble of a predetermined size by the rotational force.

To this end, the micro-bubble generating unit 60 is provided between the inner side of the housing 10 and the cavitation generating unit 40, it is preferably formed to surround the blade 45.

In addition, a plurality of holes 62 may be formed in the microbubble generating unit 60 so that the bubbles formed in the fluid collide or pass through the bubbles.

Through this, the air sucked through the gas inlet portion 30 is affected by the rotational force of the blade 45 to form a vortex and the collision with the micro-bubble generating portion 60 provided to surround the blade 45 Due to the impact force it can be broken into fine bubbles can be formed.

In addition, the microbubbles are dissolved in the fluid and become saturated, so that the saturated aeration state or the overaeration state in which the fluid is filled with air can be more easily achieved.

In addition, the fluid and the air flowing into the housing 10 to the generation of bubbles by the cavitation and the generation of micro bubbles by the micro bubble generator 60 is the blade 45 and the It is preferred to flow between the micro-bubble generating unit 60.

To this end, end portions of the fluid inlet portion 20 and the gas inlet portion 30 respectively connected to the housing 10 are preferably communicated with the inside of the microbubble generation portion 60.

Meanwhile, an end of the gas inlet 30 may be connected to the fluid inlet 20 instead of the housing 10.

In this case, since the specific gravity of the fluid contained in the housing 10 is greater than air in the state in which the cavitation generation unit 40 is stopped, the fluid may flow into the gas inlet unit 30, but the cavitation generation unit When the operation 40 operates, a pressure reduction phenomenon may occur, and fluid and gas may be introduced, respectively, and the above-described process may be performed.

In the above, the cavitation generating unit 40 has been described as being made in the form of a rotating body, but is not necessarily limited thereto. If cavitation can be generated by increasing the flow of the fluid accommodated in the housing 10, the present invention may be in various forms. Of course it is possible to convert.

On the other hand, the discharge portion 80 so that the fluid contained in the housing 10 is discharged to the other side surface opposite to one side of the housing 10 is connected to the fluid inlet 20 and the gas inlet 30 It is more preferable to provide.

In addition, it is preferable that the reaction tank 50 is connected to an end portion of the discharge part 80 so that the fluid transferred through the discharge part 80 is discharged and accommodated.

That is, the discharge portion 80 is provided between the housing 10 and the reaction tank 50, one end is connected to the other side of the housing 10, the other end is connected to the reaction tank 50 It is preferable to guide the fluid inside the housing 10 to the reaction tank (50).

In addition, the cross section of the discharge portion 80 is preferably formed to extend in the conveying direction of the fluid. As a result, the fluid transported through the discharge unit 80 may reduce the dynamic pressure while decreasing the flow rate, and is discharged from the discharge unit 80 because the pressure of the fluid present in the reaction tank 50 is high. As the bubbles of the fluid collapse rapidly, they can be separated into a large amount of micro bubbles.

As such, by containing a large amount of micro-bubbles in the fluid, the decomposition efficiency can be improved by promoting the hydrolysis and dissociation of the waste water to accelerate the decomposition, through which the leachate of petroleum mixture, oil contaminated soil It is possible to more efficiently treat hardly decomposable wastewater such as surfactants.

In addition, convection occurs in the fluid contained in the reaction tank 50 by using the force of the bubble explosion generated in the process of forming the micro-bubble, thereby allowing the stirring of the fluid without a separate stirring device, Processing efficiency can be further improved.

At this time, the reinforcement described above to be applied to the housing 10 on the inner surface of the reaction tank 50 so that the destructive force due to the collapse of the bubble can be prevented from causing damage to the inner surface of the reaction tank 50. Can be applied.

In addition, since the smaller the size of the bubble has a number of advantages can be actively utilized in various industrial fields. Specifically, when the size of the bubble is less than 10㎛ due to the characteristics of the micro-bubble bubbles are easily deformed or the bubbles are combined in the water to increase the bubbles are small because it is applied to the water quality improvement in the environmental industry field because the bubble is air It has the advantage that air resistance is significantly less than water. In addition, in order to amplify the sailing speed of the ship, when the microbubble is injected into the water and the contact surface of the ship can reduce the resistance of the ship will be able to increase the speed.

In addition, when the microbubbles are used in the water treatment process, the surface area of the bubbles becomes wider, so that the dissolution rate is improved and the activity of the microorganisms is increased, thereby improving the water treatment efficiency. For example, when the microbubbles are injected into the activated sludge for the wastewater treatment, the dissolved oxygen concentration is increased. At the same time, as the solids present in the microbial reaction tank are separated from the flotation due to the microbubbles, the water treatment efficiency may be further improved.

On the other hand, the reaction tank 50 may be activated by the high temperature microbial strain to increase the temperature due to the fermentation heat naturally generated in the growth process.

Through this, high concentrations of biological oxygen demand (BOD) and suspended solids (SS) can be used to effectively treat high concentrations of organic wastewater, which has a high pollution load and greatly affects environmental pollution. .

The reaction tank 50 may be made of an aerobic reaction tank or aerobic high temperature fermentation tank.

Hereinafter, a method of treating wastewater using the wastewater treatment apparatus will be described.

First, the fluid to be purified is introduced into the housing 10 through the fluid inlet 20 (S100).

At this time, the solid-liquid separation process step (S10) to reduce the concentration of the suspended solids (SS) in the fluid introduced for the purification process can be further preceded, through this process, the main treatment is not a failure in the water treatment process It is possible to remove suspended solids at an appropriate concentration level.

Then, gas is introduced into the housing 10 through the gas inlet part 30 (S110).

At this time, the cavitation generating unit 40 provided inside the housing 10 operates to rotate the blade 45 to cause cavitation to occur in the fluid contained in the housing 10 (S120).

Then, the cavitation is generated and the fluid is bubbled is introduced into the reaction tank 50 is to be subjected to the oxidative decomposition process (S130).

Meanwhile, the fluid (treated water) in which organic matter is completely decomposed by the oxidative decomposition process is moved to a sedimentation tank (not shown) which is separately provided, and the process of discharging only the clear treated water of the upper part through the sludge precipitation process by gravity is more. It may be made (S20).

In this case, when the immersion membrane is applied to the reaction tank, the sedimentation tank may be omitted.

Part of the sludge precipitated in the settling tank is returned to the reaction tank, and the other part is separated into a solid and a liquid through a solid-liquid separation process. In addition, the separated solid is composted, and the liquid may be mixed with the fluid to be purified first (S30).

Here, the first liquid-separated fluid and the final sludge of the solid-liquid separated sedimentation tank has a separate matrix property.

In addition, the micro-bubbles of the reaction tank to perform the process of floating separation of the suspended solids and solids, etc. present in the reaction tank.

3 is a configuration diagram schematically showing the configuration of a wastewater treatment apparatus according to a second embodiment of the present invention. In the wastewater treatment apparatus according to the present embodiment, the housing described above may be located inside the reaction tank, and one side of the housing may be enlarged and opened, and other constructions thereof are the same as in the above-described first embodiment, and thus description thereof is omitted.

As shown in FIG. 3, the housing 110 is preferably located inside the reactor 150.

In addition, the fluid inlet 120 may include a pump 22 and a fluid inlet pipe 124. The fluid received in the reactor 150 by the pump pressure generated in the pump 22 is the It is preferable that the fluid is introduced into the housing 110 through the inlet pipe 124.

Here, the pump 22 may be selectively positioned at either the inside or the outside of the reaction tank 150.

In addition, the fluid inlet pipe 124 preferably communicates with one side of the housing 110 through one side of the reactor 150.

In addition, the gas inlet 130 is preferably in communication with one side of the housing 110 through one side of the reaction tank 150.

The fluid inlet 120 and the gas inlet 130 penetrating the reaction tank 150 should be sealed to prevent leakage of the fluid contained in the reaction tank 150.

On the other hand, it is preferable that the cross section of the housing 110 is enlarged in the direction in which the fluid inside the housing 110 is transferred.

As a result, when the fluid is discharged from the housing 110, a pressure drop is induced, and bubbles contained in the discharged fluid may explode to be decomposed into fine bubbles, and wastewater treatment efficiency may be improved.

In addition, the other side surface of the housing 110 through which the fluid is discharged is preferably formed to be open.

Accordingly, the fluid inside the housing 110 is discharged from the housing 110 by the rotating blade 145 and flows directly into the reactor 150, thereby simplifying and miniaturizing the device. It can be done.

In addition, the inside of the housing 110 is preferably provided with a reinforcing portion 165 of a shape corresponding to the housing 110.

In addition, the housing 110 is preferably supported by the first lower support 190 that can be provided on the inner bottom surface of the reactor 150 is installed.

In addition, the other end of the rotating shaft 142 having one end coupled to the power generator 72 may be coupled to the mounting 12 119 which may be installed to be supported by the second lower support 192.

Through this, the housing 110 and the cavitation generating unit 140 can be firmly fixed.

On the other hand, in the mounting table 119, before the fluid discharged from the housing 110 collides directly with the inner surface of the reaction tank 150, the cavitation offset unit 180 for reducing the explosion force of the bubbles contained in the fluid It is more preferably provided.

Here, the cavitation canceling unit 180 preferably includes a rotating unit 185 and an offset blade 181 provided in the rotating unit 185.

In addition, the offset blade mounted at the rear end of the housing, that is, the rear end of the discharge port through which the fluid is discharged, and the reinforcement part surrounding the cavitation generating part are for canceling the strong gas explosion force generated during the microbubbling process, and provide a control function to control the cavitation phenomenon. do

In addition, the rotating part 185 may be coupled to the bearing 183 provided in the mounting table 119. At this time, the rotating part 185 is preferably provided not to be connected to the rotating shaft 142.

Through this, the rotating unit 185 is able to rotate independently from the rotating shaft 142.

In addition, the offset blade 181 is preferably formed in the shape of a fan or a propeller so that the fluid discharged from the housing 110 may hit.

Accordingly, the offset blade 181 may be rotated by the explosive force generated when the fluid discharged from the housing 110 collides, or bubbles contained in the fluid are decomposed into fine bubbles.

As described above, since the explosive force and the kinetic energy of the fluid are offset by being used as a rotational power source for rotating the offset blade 181, the inner surface of the reactor 150 may be prevented from being damaged by the explosive force. .

In addition, the offset blade 181 is rotated corresponding to the explosive force and the kinetic energy of the fluid, and rotates independently of the rotating shaft 142, so that the explosive force and the kinetic energy of the fluid is rotated of the offset blade 181 Switching to a power source can be made more effective.

Therefore, damage to the offset blade 181 itself can be minimized, and durability of the offset blade 181 can be improved.

In addition, the fluid inside the reactor 150 may be more effectively stirred by the rotation of the offset blade 181.

Figure 4 is a schematic diagram showing the configuration of a wastewater treatment apparatus according to a third embodiment of the present invention. Since the basic configuration of the wastewater treatment apparatus according to the present embodiment is the same as the above-described embodiment, a description thereof will be omitted.

As shown in FIG. 4, the power generating unit 72, the cavitation generating unit 140, the housing 110, the microbubble generating unit 160, the cavitation canceling unit 180, and the fluid inlet unit 220 may include a reaction tank ( It is preferably provided to immerse in the fluid contained in (250).

In addition, the power generator 72 and the housing 110 are preferably fixedly connected to a fixing member 299 (eg, a chain, etc.) that may be connected to a separate support frame 295.

In addition, the fluid inlet 220 is a pump 22 to provide a pumping force to allow the fluid to be introduced from the outside of the reactor 250, or the fluid contained in the reactor 250 is introduced into the housing 110. ) May be further included.

In addition, one side of the gas inlet 230 is in communication with the housing 110, the other side is preferably exposed to the atmosphere through one side of the reaction tank 150.

The housing 110 is applied to a direction in which the force generated during the explosion in the process of micro-bubble bubbles to explode in a suitable position so that the stirring of the fluid can be efficiently performed by the convection of the fluid contained in the reactor 250 It is preferred to be installed.

In addition, the positional change and fixing may be performed by appropriately adjusting the support frame 295 and the fixing member 299.

As described above, the present invention is not limited to the above-described specific preferred embodiments, and various modifications may be made by those skilled in the art without departing from the gist of the present invention as claimed in the claims. It is possible and such variations are within the scope of the present invention.

1 is a configuration diagram schematically showing the configuration of a wastewater treatment apparatus according to a first embodiment of the present invention.

2 is a flow chart showing a wastewater treatment method according to a wastewater treatment apparatus according to a first embodiment of the present invention.

Figure 3 is a schematic diagram showing the configuration of a wastewater treatment apparatus according to a second embodiment of the present invention.

Figure 4 is a schematic diagram showing the configuration of a wastewater treatment apparatus according to a third embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

10,110: housing 20,120,220: fluid inlet

22: pump 24,124: fluid inlet pipe

30,130,230: gas inlet 40,140: cavitation generating unit

42,142: axis of rotation 45,145: blade

50,150,250: reactor 60,160: microbubble generating unit

62: hole 65,165,265: reinforcement

72: power generating portion 80: discharge portion

180: cavitation offset portion 181: offset blade

185: rotating part 295: support frame

299: fixing member

Claims (9)

A housing having a space formed therein; And, Reducing the fluid introduced into the housing by rotating the introduced fluid at a high speed so that cavitation can occur in the fluid introduced into the housing; By the cavitation phenomenon generated by the above method includes a cavitation generation unit that generates bubbles even inside the housing without a separate gas supply from the outside; The bubble generated by the cavitation generating unit is pulverized into fine bubbles due to the pressure difference with the outside of the housing. The method of claim 1, Microbubble generating device comprising a micro-bubble generating portion formed with a plurality of holes to reduce the size of the bubble while the bubble formed by the cavitation generating unit hit or pass. The method of claim 1, And a gas inlet unit connected to one side of the housing to induce gas into the interior of the housing to promote bubble generation generated by cavitation and to secure a sufficient amount of micro bubbles generated at the same time. Microbubble generating device according to any one of claims 1 to 3; A fluid inlet connected to one side of the housing to allow fluid to flow into the housing; And And a reaction tank in which a fluid including bubbles discharged from the inside of the housing is accommodated and a process including an oxidative decomposition process and a floating separation process is performed. The method according to claim 1 or 2, One side of the housing further comprises a reaction tank connected to the discharge unit for discharging the bubbles generated by the micro-bubble generating unit. The method of claim 4, wherein The housing is located inside the reaction vessel, the one side is opened so that the fluid is discharged from the housing and flows into the reaction vessel at the same time, the pressure drop is induced when the fluid is discharged contained in the fluid And the cross section of the housing is enlarged in the conveying direction of the fluid so that the bubble is exploded and decomposed into micro bubbles. The method of claim 4, wherein One side of the housing is rotated by the explosive force generated when the bubbles contained in the fluid discharged from the housing is decomposed into micro-bubbles, the cavitation offset portion to offset the explosive force to protect the inner surface of the reaction tank is further provided Wastewater treatment device. The method of claim 4, wherein The inner circumference of the housing is provided to surround the cavitation generating unit is further characterized in that the reinforcement portion is further provided to block the explosive force generated during the collapse of the bubbles formed in the pressure reduction phenomenon of the fluid to prevent damage to the inner surface of the housing Processing unit. Introducing a fluid to be purged into the housing through a fluid inlet connected to one side of a housing having a space formed therein; Generating a bubble by depressurizing the fluid and generating cavitation by a cavitation generating unit provided in the housing; Bubbles contained in the fluid are discharged from the housing to move to a high pressure reaction tank to explode to form micro bubbles; And, Wastewater treatment method comprising the step of performing a process including the oxidative decomposition process and the flotation separation process by the fine bubbles.

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