KR20120104927A - Dissolved airfloatation system and a water treatment equipment using the nozzle for generating micro and/or naco bubbles - Google Patents

Abstract

PURPOSE: A floating bath and a water treating apparatus using a nozzle are provided to extend the residence time of bubbles in water by lowering the floating speed of the bubbles. CONSTITUTION: A water treating apparatus(200) includes a floating bath(100), a nozzle(250), and a dissolved water generator(240). One or more partitions(150, 160) are arranged at the floating bath. The heights of the partitions are lower than the adequate surface of water in the floating bath. The floating bath filters and floats the pollutants of wastewater using bubbles of micro particles. The nozzle generates the bubbles in the floating bath based on air dissolved water. The dissolved water generator supplies the dissolved water to the nozzle. The nozzle includes a hollow shaped outer chamber, a hollow shaped inner chamber, and a collision plate. The inner chamber receives the dissolved water and discharges the dissolved water toward the collision plate. The bubbles form a bubble filtering layer to prevent the precipitation of the pollutants. [Reference numerals] (130) Circulating region; (140) Cleaning region; (210) Circulating water pump; (220) Air supplying unit; (230) Air injector; (240) Dissolved water generator; (AA) Introducing water; (BB) Treated water

Description

Floating tank and water treatment device using nozzle to generate micro bubbles {DISSOLVED AIRFLOATATION SYSTEM AND A WATER TREATMENT EQUIPMENT USING THE NOZZLE FOR GENERATING MICRO AND / OR NACO BUBBLES}

The present invention relates to a nozzle for generating fine bubbles and to a floating tank and a water treatment apparatus using the same.

Population concentration due to urbanization and industrialization due to industrial development leads to the generation of a large amount of living sewage and industrial wastewater, which has a serious impact on the environmental ecosystem due to the increase and accumulation of pollution load on the surrounding environment. For example, water pollution is aggravated by the proliferation of food waste, synthetic detergents, domestic sewage such as septic tanks, industrial wastewater, fishery wastewater, or livestock wastewater flowing out of factories.

However, despite the fact that water pollution is accelerating, it is becoming difficult to treat contaminated water due to the trend of limiting devices and places that can handle contaminated water in reality, and enormous cost to improve water pollution. This happens. Therefore, there is a need to find a way to improve the water quality by treating the contaminated water cheaper and more effectively.

An object of the present invention is to provide a flotation tank and a water treatment apparatus using fine bubbles capable of efficiently treating wastewater by raising a bubble with contaminants attached to the wastewater and forming a bubble filter layer using the floated bubbles.

An object of the present invention is to provide a nozzle and a fine bubble generator using the same that can be used in the flotation tank and water treatment apparatus for treating waste water and can generate fine bubbles.

According to an exemplary embodiment of the present invention, there is provided at least one partition wall lower than the proper surface of the inside, the floating tank for filtering and floating the contaminants of the waste water using the bubbles of the fine particles; A nozzle for generating bubbles of the fine particles into the floating tank from dissolved water in which air is dissolved; And a melted water generator for supplying the dissolved water to the nozzle, wherein the nozzle is formed in a cylindrical outer chamber having an empty inside, and located inside the outer chamber and having a hollow inside. And an impingement plate, wherein the inner chamber receives dissolved water from the dissolution water generator and flows toward the impingement plate, and bubbles of the fine particles introduced into the flotation tank float above the flotation vessel. There is provided a water treatment apparatus using fine bubbles, characterized in that to form a bubble filter layer to prevent precipitation of the contaminants.

According to another exemplary embodiment of the present invention, there is provided a nozzle for use in a microbubble generating device, comprising: a cylindrical outer chamber having an empty interior; A cylindrical inner chamber located inside the outer chamber and having an empty interior; And an impingement plate, wherein the internal chamber receives air and water, and provides a nozzle for a fine bubble generator, characterized in that the incoming water and air flow out toward the impingement plate.

According to one or more embodiments of the present invention, since the micro-bubbles rise and perform independent dispersion movement, there is no synergistic coupling phenomenon, and bubbles are saturated in the underwater environment, so that the bubbles have a very slow rise speed. That is, the time the bubble stays in water is long, and the ability to collect contaminants can be greatly improved.

In addition, since bubbles having a large surface area form a bubble filter layer and are suspended in water, the time that the pollutant is suspended becomes long, and consequently, the pollutant can be removed more efficiently.

According to one or more embodiments of the present invention, micro and / or nano sized microbubbles may be created.

1 is a view showing a flotation using a bubble according to an embodiment of the present invention,
2 is a view showing a water treatment apparatus using a bubble according to an embodiment of the present invention,
3 is a view for explaining the independent dispersion motion of bubbles generated from the nozzle according to an embodiment of the present invention,
4 is a view showing an example of a process of forming a bubble filter layer by generating fine bubbles in the water treatment apparatus according to an embodiment of the present invention,
5 is a view for explaining the effect of remaining in the water of the bubble filter layer generated in the water treatment apparatus according to an embodiment of the present invention,
6 is a view showing the configuration of a nozzle according to an embodiment of the present invention;
7 to 9 are views provided to explain the nozzle of FIG. 6, and
11 to 12 are views for explaining the effect of the nozzle according to the embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features, and advantages of the present invention will become more readily apparent from the following description of preferred embodiments with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In this specification, when an element is referred to as being on another element, it may be directly formed on another element, or a third element may be interposed therebetween. Also in the figures, the thickness of the components is exaggerated for an effective description of the technical content.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. The terms "comprises" and / or "comprising" used in the specification do not exclude the presence or addition of one or more other elements.

Hereinafter, the present invention will be described in detail with reference to the drawings. In describing the specific embodiments below, various specific details have been set forth in order to explain the invention in greater detail and to assist in understanding it. However, those skilled in the art can understand that the present invention can be used without these various specific details. In some cases, it is mentioned in advance that parts of the invention which are commonly known in the description of the invention and which are not highly related to the invention are not described in order to prevent confusion in explaining the invention without cause.

1 is a view showing a floating tank using a bubble according to an embodiment of the present invention.

Referring to FIG. 1, the flotation tank 100 using bubbles according to an embodiment of the present invention includes a flotation reaction zone 110, a bubble filter zone 120, a circulation zone 130, a cleaning zone 140, and a first zone. The partition wall 150 and the second partition wall 160 may be included.

The floating tank 100 shown in FIG. 1 floats the contaminants (Scum) contained in the waste water onto the water, so that the injured contaminants are suspended for a long time by bubble filtering and are easily carried out by a device such as a skimmer (not shown). Device to be removed. The contaminants may be solid microparticles.

The floating reaction region 110 may be formed by one of the surfaces located on both sides of the floating tank 100 and the first partition wall 150. In addition, one of the surfaces located on both sides of the floating reaction region 110 (one surface of the injured tank 100) is provided with a first inlet (not shown), the second inlet on the lower surface of the floating reaction region 110 A part (not shown) may be provided. Wastewater containing hardly degradable contaminants is introduced into the floating reaction region 110 through a first inlet (not shown), and bubbles of fine particles may be introduced through a second inlet (not shown). have. Herein, the bubbles of the microparticles collectively refer to bubbles having a micro size and / or a nano size. On the other hand, the fine bubble generator in the present specification means a configuration including an air injector, dissolved water generator, and a nozzle, it may further include a pump or air supply for supplying water to the air injector.

The waste water and the bubble may be introduced at the same time or the bubble may also be introduced together after a predetermined time elapses after the waste water is introduced. This is to allow the pollutants of the waste water to be adsorbed to the bubbles and float with the bubbles. That is, the bubbles flowing into the flotation reaction zone 110 rise to the top of the flotation tank 100 while adsorbing contaminants in the wastewater.

The bubble may have a micro particle size or a nano particle size. The surface of the bubble (or signifier) is charged with negative (-) ions in the floating reaction region 110, whereby the bubble is subjected to independent dispersion by the ion repulsion between the bubbles can prolong the residence time in the water.

The bubble filter region 120 is a region corresponding to the upper portion of the floating reaction region 110, the circulation region 130, and the cleaning region 140. In the bubble filter region 120, a bubble filter layer may be formed by bubbles floating in the floating reaction region 110. The bubble filter layer may prevent the contaminants adsorbed on the floating bubble from settling into the floating reaction region 110, the circulation region 130, and the cleaning region 140.

The circulation region 130 is formed between the first partition wall 150 and the second partition wall 160, and the wastewater in which some contaminants are removed from the wastewater flowing into the floating reaction region 110 is moved to vortex or circulate. Area. Wastewater circulated or vortexed in the circulation region 130 is not diffused into the bubble filter region 120 by the first and second barrier walls 150 and 160. Thereby, it can prevent that a bubble filter layer disintegrates by the flow of waste water.

On the other hand, since some contaminants in the wastewater are removed by bubbles floating in the flotation reaction region 110, the wastewater from which some contaminants have been removed flows into the circulation region 130. Therefore, as shown in FIG. 1, wastewater in the flotation reaction region 110 may be turbid than wastewater in the circulation region 130. Wastewater moved from the floating reaction zone 110 to the circulation zone 130 may be re-introduced into the floating reaction zone 110. Hereinafter, the wastewater located in the circulation region 130 is called circulating water. Circulating water can be used to keep the bubble filter layer on top.

The cleaning area 140 may be formed by the other one of the surfaces located on both sides of the floating tank 100 and the second partition wall 160. Waste water (hereinafter, referred to as “treated water”) in which most contaminants have been removed by a bubble or bubble filter layer may be introduced into the cleaning area 140 and stored therein. When a certain amount of treated water is stored in the cleaning area 140, the treated water may be discharged to a tank such as an anaerobic tank (not shown).

The first and second barrier ribs 150 and 160 physically separate the floating reaction zone 110, the circulation zone 130, and the cleaning zone 140, and the bubble filter layer is not disintegrated by the circulation water or the treated water. It may be provided inside the floating tank 100 to maintain a filter layer of a constant thickness. In detail, the circulation water and the treated water in the circulation area 130 and the cleaning area 140 are vortexed only in the circulation area 130 and the cleaning area 140 by the first and second partitions 150 and 160. Or cycle. As a result, since the circulating water or the treated water does not move to the bubble filter region 120 in which the bubble filter layer is formed, the bubble filter layer may be maintained. This is because when the bubble filter layer is disintegrated, bubbles with contaminants adhere to the circulation zone 130 or the cleaning zone 140 and are subsequently mixed with the treated circulating or treated water.

The heights of the first and second bulkheads 150 and 160 may be lower than the height of the flotation tank 100 to provide a movement path while the wastewater is being treated while contaminants are removed. Alternatively, the height of the second partition wall 160 may be lower than or equal to the height of the first partition wall 150. For example, the movement path of the wastewater, the wastewater flowing into the floating reaction zone 110 is moved to the circulation region 130 over the first partition wall 150 while some contaminants are removed by the bubble or bubble filter layer. In addition, the remaining contaminants in the circulating water moving to the circulation region 130 may be removed by the bubble filter layer and may move beyond the second partition 160 to the cleaning region 140.

Although the first and second partitions 150 and 160 are illustrated in FIG. 1, three or more partitions may be provided in the floating tank 100. As the number of partitions increases, contaminants in the wastewater can be removed more cleanly by the flotation filter layer.

2 is a view showing a water treatment apparatus using a bubble according to an embodiment of the present invention.

Referring to FIG. 2, the water treatment apparatus 200 using the bubble includes a circulating water pump 210, an air supplier 220, an air injector 230, a dissolved water generator 240, a nozzle 250, and a floating tank 100. ) May be included.

With the circulating water pump 210, wastewater from which some contaminants have been removed from the floating tank 100 may be introduced through an outlet (not shown) provided at the lower portion of the circulation area 130, and may be discharged to the air injector 230. have. When one side of the circulating water pump 210 is connected to the bottom of the circulating area 130 of the flotation tank 100 in a conduit, the circulating water pump 210 may receive the circulating water. The circulating water pump 210 may be a pressurized pump that compresses and discharges circulating water.

The air supplier 220 may spray the air injector 230 with air in the atmosphere or air in an air tank (not shown).

The air injector 230 may inject air introduced from the air supply 220 into the circulating water introduced from the circulating water pump 210 and discharge the air to the dissolved water generator 240.

The dissolved water generator 240 may dissolve air in circulating water introduced from the air injector 230 to generate dissolved water, and discharge the generated dissolved water to the nozzle 250 through a conduit. The air vent 241 discharges large air particles to the outside. A conduit connecting the melted water generator 240 and the nozzle 250 may be provided through an outlet (not shown) provided in the lower portion of the floating reaction region 110.

The nozzle 250 may generate bubbles having a size of fine particles from the dissolved water introduced from the dissolved water generator 240 to the floating reaction region 110. For example, the nozzle 250 may spray the incoming melted water into a bubble form, that is, bubbles of fine particles while hitting the inner surface of the nozzle 250. The nozzle 250 may be provided with a plurality of injection nozzle holes through which bubbles are injected. The nozzle 250 may use a collision type two-fluid nozzle capable of changing the injection nozzle diameter (diameter of the injection nozzle hole) for each bubble generation flow rate. The injection nozzle diameter can be changed mechanically. The impingement type two-fluid nozzle may cause bubbles to be generated while colliding droplets of microparticles under optimum conditions when injecting dissolved water, and may uniformly distribute the diameters of the bubbles.

Hereinafter, the features of the nozzle 250 according to an exemplary embodiment of the present invention will be briefly described.

1) It is possible to increase the size of the nozzle 250 that generates fine bubbles.

The nozzle 250 for spraying bubbles having a fine particle size can be miniaturized or large in size. In general, the nozzle is limited to the applicable field, such as living environment field and a small amount of water treatment device. This is because the microbubble has a large particle size or a small nozzle size of the nozzle, so that there is a limit in generating a large amount of micro bubbles. However, the nozzle 250 used in the embodiment of the present invention may be applied to the injection nozzle diameter differently for each generation flow rate of the bubble, and may be used as a large-capacity fine bubble generator when connected in a manifold manner. . For example, when 10 200 l / min nozzles are manufactured in one manifolder type, the manifolder type nozzle 250 may generate fine bubbles of 2 m ³ / min (2,880 m ³ / day). In addition, when five 500 l / min nozzles are manufactured in one manifolder type, the manifolder type nozzle 250 may generate fine bubbles of 2.5 m ³ / min (3,600 m ³ / day).

2) The clogging phenomenon of the nozzle 250 due to solid matter can be suppressed.

In general, the nozzle may be easily blocked by foreign matter such as a floating material due to a small injection nozzle diameter or a collision protrusion in the nozzle. However, the impingement-type two-fluid nozzle 250 can adjust the injection nozzle diameter. Therefore, when the wastewater flowing into the flotation tank 100 is pretreated to remove most of the suspended solids of 5 mm or more, if the spray nozzle diameter is adjusted wide (for example, about 5 mm), the suspended solids of about 5 mm pass through without being blocked. You can. In addition, since the fine bubbles are small particles, the contaminants that are solid particles of the fine particles may also be adsorbed onto the fine bubbles to be sufficiently floated and removed.

Meanwhile, the flotation tank 100 includes the flotation reaction region 110, the bubble filter region 120, the circulation region 130, the cleaning region 140, the first partition wall 150, the second partition wall 160, and the discharge port ( 170). The floating tank 100 of FIG. 2 is the same as the floating tank 100 described with reference to FIG. 1.

Briefly, the flotation tank 100, the bubbles of the fine particles injected from the nozzle 250 is floating in the flotation reaction region 110 to adsorb the pollutants, the bubbles adsorbed by the pollutants are first and second A bubble filter layer may be formed in the bubble filter region 120 by the partitions 150 and 160. The first and second barrier ribs 150 and 160 may allow circulation water and treated water to circulate only in the circulation area 130 and the cleaning area 140, respectively, and prevent the inflow into the bubble filter area 120. . As a result, the bubble filter layer is not disturbed by the interference of the circulating water or the treated water, and can maintain a layer having a predetermined thickness, and as a result, can continuously provide an effect of filtering contaminants. The treated water of the cleaning area 140 may be discharged to a tank such as an anaerobic tank through the discharge port 170.

In addition, one of the surfaces located on both sides of the floating reaction region 110 (one surface of the injured tank 100) is provided with a first inlet (not shown), the second inlet on the lower surface of the floating reaction region 110 A part (not shown) may be provided. Wastewater containing hardly degradable contaminants is introduced into the floating reaction region 110 through a first inlet (not shown), and bubbles of fine particles may be introduced through a second inlet (not shown). have.

The lower surface of the circulation area 130 is provided with a discharge port (not shown) for discharging the circulating water to the circulating water pump 210, the discharge port (not shown) and the circulating water pump 210 by a pipe (not shown) Can be connected.

The function of the bubble filter layer formed in the flotation tank 100 is as follows.

Generally, the filter used in the water treatment filtration technology includes a pressure filter for filling a filter with sand or a fiber carrier, a fiber yarn filter, a membrane filter, and the like. Water treatment filtration technology must backwash to remove the solids concentrated in the filtration layer after filtration and regenerate the filter carrier, and the filtration function is stopped during the backwashing process and continuous operation is impossible. In general, the filter is generated by 5-10% of the water supply backwash (contaminated water), the reprocessing cost must be incurred to treat this, and the treatment plant also increases in consideration of this.

However, when the bubble filter layer proposed in the embodiment of the present invention is formed in the flotation tank 100 to treat inflow water such as wastewater in a down flow, contaminants of the wastewater are gradually formed in the flotation reaction region 110. Contaminants may be adsorbed onto the bubbles of the bubble layer and float. This increases the filtering effect of contaminants or fine-sized solids in the form of ordinary solids. In addition, although a fluid flow rate loss (pressure loss) occurs due to the water resistance of the carrier of the filter, the bubble filter layer has almost no pressure loss.

In addition, the filter is generally about 5 to 10% of the influent water generated in the backwash water, but in the embodiment of the present invention, since only the contaminant that is injured is mechanically removed using a scum skimmer (not shown), the pollutant generation amount It is about 0.1 to 0.5% of this inflow. Therefore, the amount of backwash water generated in the present invention has an effect corresponding to a level of 1 to 5% compared to the amount of backwashed water of the filtration apparatus.

Bubbles, on the other hand, are closely related to temperature, pressure, water viscosity, and the like. Bubbles having a diameter of 50 μm to 100 μm or more are called macro bubbles, bubbles having a diameter of 20 μm to 50 μm are called micro bubbles, and bubbles having a diameter of 1 μm to 20 μm are usually microbubbles (MNB: Micro / Nano Bubble). The fine bubbles used in the embodiment of the present invention may have a diameter of, for example, 2㎛ ~ 30㎛, but is not limited thereto.

3 is a view for explaining the independent dispersion motion of the bubble generated from the nozzle according to an embodiment of the present invention.

Referring to FIG. 3, bubbles sprayed from the nozzle 250 are charged with negative (-) ions while being sprayed to perform independent dispersion by ion repulsion between bubbles. Because of the independent dispersion movements, no synergistic coupling phenomenon occurs in which each bubble floats, so that each bubble can float while independently adsorbing contaminants in the wastewater.

The characteristics of the fine bubbles as the fine particle bubbles injected by the nozzle 250 are as follows.

-The size of the microbubbles is very small in micro units, which makes the floating speed slow. For example, according to Stokes' equation, when the diameter of the bubble is 50 µm, the floating speed in water at room temperature is 84 mm / min.

In addition, since the bubbles floating on the upper part of the floating tank 100, that is, the bubble filter area 120, have a small size, the specific surface area (bubble surface area per the same volume) increases, which is the adsorption operation or mass transfer of the gas-liquid interface. It can act advantageously for manipulation.

The surface of the microbubbles is charged with (-) ions while OH ^- ions formed by ionizing water molecules are collected at the interface by a cluster structure (for example, a hydrogen bonding network) generated at the gas-liquid interface.

(제타) 전위는 버블 지름(20㎛~60㎛)과 관계없이 -35mV이다. 이 제타전위는 pH의 영향을 받아 강산성에서는 대략 0mV, 강알칼리성에서는 대략 -100mV가 된다. 수중의 먼지성분 흡착은 미세 기포의 표면전하와 관계가 있다.Of fine bubbles in distilled water

The (zeta) potential is -35 mV irrespective of the bubble diameter (20 µm to 60 µm). This zeta potential is approximately 0 mV in strong acidity and -100 mV in strong alkalinity under the influence of pH. Adsorption of dust components in water is related to the surface charge of microbubbles.

-The pressure difference inside and outside the bubble in water can be obtained by Young-Laplace equation below.

In Equation 1, s is the surface tension of water, d is the diameter of the bubble, P is the pressure difference between the inside and outside of the bubble, the smaller the bubble diameter increases the pressure difference between the inside and outside of the bubble. Assuming this change occurs in adiabatic compression, the temperature in the bubble also rises sharply. Therefore, when bubbles burst by external force such as ultrasonic waves, high pressure and high temperature are instantaneously generated.

-As the bubble is independantly distributed, there is no synergy. In detail, a normal bubble (Macro bubble or mm sized bubble) has a phenomenon in which buoyancy is increased by the inter-bubble bond as the bubble rises in the water and rises to the surface at a higher speed. It is charged with ionic repulsion, and the bubble is saturated in the underwater environment due to mutual collision and independent dispersion.

4 shows an example of a process in which a bubble is formed by generating fine bubbles in the water treatment apparatus according to an embodiment of the present invention.

Referring to FIG. 4, when wastewater flows into the floating tank and bubbles are generated from the nozzles, bubbles that are adsorbed with contaminants are generated and floated from the floating reaction zone after one minute. A bubble filter layer is formed in the bubble filter region of the floating tank. After about 5 minutes, the bubble filter layer and bubbles are formed in most of the floating tanks, resulting in saturation. As a result, the rise of the bubbles takes a long time to improve the durability of the bubble filter layer.

5 is a view for explaining the residual effect of the bubble filter layer generated in the water treatment apparatus according to an embodiment of the present invention.

Referring to FIG. 5, even after 1 to 3 minutes elapses after the saturation (Milky Saturation), the fine bubbles and the bubble filter layer remain in the water. Therefore, the bubble filter layer formed by the embodiment of the present invention is maintained in the flotation tank for a long time can be usefully used for the removal of contaminants and the discharge of treated water, providing the effect of improving the reaction persistence and dissolution rate in water can do.

According to the embodiment of the present invention described above, the circulating water pump 210 injects the circulating water discharged from the floating tank 100 to the dissolved water generator 240. That is, the flotation tank 100 reuses the wastewater already used to float the pollutants. On the contrary, according to another embodiment of the present invention, the circulating water pump 210 may be supplied with water from the water supply (not shown) other than the floatation tank 100 and injected into the dissolved water generator 240. That is, the water used for the rise of contaminants in the flotation tank 100 can be supplied from outside the flotation tank 100.

6 is a view showing a configuration of a nozzle according to an embodiment of the present invention, Figures 7 to 9 are views provided to explain the nozzle of FIG.

The nozzle 250 illustrated in FIG. 2 may have a configuration as shown in FIGS. 6 to 9, and the nozzle 250 will be described in detail with reference to the drawings illustrated in FIGS. 6 to 9.

The nozzle 250 may include an impingement plate 251, an outer chamber 253, an inner chamber 257, and an injection hole 259. The nozzle 250 may further include a flange 255 and a support 262.

The outer chamber 253 has a cylindrical shape, and the inner chamber 257 is located therein.

The inner chamber 257 has a cylindrical shape with an empty inside, and may include a main body 256, an inclined portion 254, and an outlet portion 252.

The nozzle 250 may receive a mixture of dissolved water (a state in which air is dissolved in water) flowing out of the dissolved water generator 240 to generate microbubbles. As such, when water and air are not simply mixed, and the nozzle 250 receives the dissolved water in a state in which air is dissolved in water, fine bubbles are generated as shown in FIGS. 11 to 13 to be described later. The effect becomes great.

The injection port 259 is formed in the outer chamber 253 and may receive the dissolved water flowing out of the dissolved water generator 240. The inlet 259 penetrates the outer chamber 253 and is directly connected to the inner chamber main body 256. Thus, the dissolved water flowing through the inlet 259 directly enters the inner chamber main body 256.

The dissolved water introduced into the injection port 259 is introduced into the main body 256 of the inner chamber and rotated.

The molten water rotated in the main body 256 is moved to the inclined portion 254 to be accelerated and rotated, and the accelerated rotated molten water flows out through the outlet 252 and then collides with the collision plate 251. The dissolved water under pressure until immediately before the outflow to the outlet 252 is released, and microbubbles are generated as the impingement plate 251 is buried.

The inclined portion 254 has a conical funnel shape to facilitate acceleration, one end of the inclined portion 254 is connected to the main body 256, the other end of the inclined portion 254 is connected to the outlet portion 252. It is. The diameter of the portion connected to the main body 256 in the inclined portion 254 is larger than the diameter of the portion connected to the outlet portion 252.

The outlet part 252 is a shape of a hollow tube, and receives the molten water accelerated and rotated by the inclined part 254, and the collision plate 251 in a state in which the rotational speed of the molten water and the pressure of the molten water are maintained. Spill so that it will crash towards you.

The impingement plate 251 is formed in the shape of a rectangular plate, and is positioned so that the melted water flowing out of the outlet portion 252 is directed in a direction perpendicular to the direction in which the outlet portion 252 outflows the dissolved water.

The collision plate 252 and the outlet part 252 are spaced apart by a predetermined distance, and the collision plate 252 is fixed to the outer chamber 253 by the support 262.

As in the present embodiment, the fine water may be generated by dissolving the melted water generated by the melted water generator 240 through the nozzle.

10 to 12 are views for explaining the effect of the nozzle according to the embodiment of the present invention.

10 and 11 are simulation results of the flow rate and the flow of water in the nozzle according to the present invention. As can be seen from these figures, the melted water is accelerated and rotated in the nozzle to impinge on the impingement plate so that bubbles can be generated.

Figure 12 shows the distribution of bubbles generated from the nozzle when the nozzle according to the present invention is located in the floating region. Referring to FIG. 12, bubbles generated in the nozzle are about 1.3% of bubbles having a diameter of 5 μm, about 27.9% of bubbles having a diameter of 10 μm, and about 38% of bubbles having a diameter of 20 μm.

Referring to FIG. 12, the flow of bubbles is indicated in chronological order, and as can be seen from this flow, the nozzle can be usefully used in the water treatment apparatus according to the present invention.

The microbubble generating device using the nozzle and the nozzle described above has been described as an example used in the flotation tank and the water treatment device, but it can be used in other devices (devices requiring fine bubbles) other than such a device.

While the present invention has been described with reference to the particular embodiments and drawings, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. This is possible. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the claims.

100: flotation 110: flotation reaction zone
120: bubble filter area 130: circulation area
140: cleaning area 150: first partition
160: second bulkhead 200: water treatment device
210: circulating water pump 220: air supply
230: air injector 240: melted water generator
250: nozzle

Claims (6)

A floatation tank having one or more partition walls lower than an appropriate level of water therein and filtering and floating contaminants of the waste water using bubbles of fine particles;
A nozzle for generating bubbles of the fine particles into the floating tank from dissolved water in which air is dissolved; And
And a dissolved water generator for supplying the dissolved water to the nozzle.
The nozzle includes a cylindrical outer chamber having an empty inside, a cylindrical inner chamber located inside the outer chamber and having an empty inside, and a collision plate,
The inner chamber receives the dissolved water from the dissolved water generator and flows toward the impingement plate,
Bubbles of the fine particles introduced into the flotation tank rises to the upper portion of the flotation tank to form a bubble filter layer to prevent the precipitation of the pollutants, water treatment apparatus using a fine bubble. The method of claim 1,
When a plurality of partitions are provided in the floating tank, wastewater from which the pollutants are partially removed is moved and vortexed in an area between the partitions.
And a pump for suctioning the vortexed wastewater and introducing the dissolved water into the dissolved water generator. The method of claim 1,
The flotation tank,
The floating reaction zone in which the bubble flowing into the flotation tank floats upward while absorbing the contaminant, the circulation zone in which the wastewater from which the contaminant is partially removed is vortexed out of the wastewater flowing into the lower portion of the floating reaction zone, and the Water treatment device using a micro-bubble characterized in that the bubble is divided into a cleaning area for storing the treated water treated with the waste water. The method of claim 1,
The inner chamber,
A main body receiving the dissolved water from the inlet;
An inclined portion having a funnel shape to accelerate the rotation by receiving the molten water from the main body; And
And an outflow part receiving the dissolved water from the inclined part and outflowing the dissolved water so that the introduced dissolved water collides with the impingement plate. A nozzle used for a micro bubble generator,
A cylindrical outer chamber with an empty interior;
A cylindrical inner chamber located inside the outer chamber and having an empty interior; And
Including a collision plate;
The internal chamber receives air and water, and nozzles for generating fine bubbles, characterized in that the incoming water and air outflow toward the impingement plate. The method of claim 5,
The inner chamber,
A main body receiving water and air through an injection hole formed in the outer chamber;
A slope having a funnel shape connected to the main body to receive water and air and accelerate the water and air; And
And an outlet portion connected to the inclined portion to receive dissolved water, and an outlet portion for discharging the dissolved water so that the introduced dissolved water collides with the impingement plate.

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