KR20190010417A - High efficiency micro bubble generator, floatation plant using the same and operating method of the same - Google Patents

Abstract

The present invention relates to a micro bubble generating device with high efficiency, a flotation apparatus using the same and an operating method thereof. Specifically, the present invention relates to a micro bubble generating device with high efficiency and a flotation apparatus using the same which generate micro floc by providing micro bubble into contaminated water and simultaneously spraying a coagulant and purify contaminated water by attaching micro bubble to the micro floc and floating the same. According to an embodiment of the present invention, included are: a mixing tank (100) which has a first inner space (I1) be formed at the inside thereof and has contaminated water which is introduced from the outside be stored at the first inner space (I1); a micro bubble generating device (200) which is installed at the first inner space (I1) and generates micro bubble at the contaminated water; a floatation tank (300) which has a second inner space (I2) be formed at the inside thereof and has the contaminated water which is introduced from the first inner space (I1) be stored at the second inner space (I2); and a connection pipe (400) which is installed to make a first inner space (I1) of the mixing tank and a second inner space (I2) of the floatation tank (300) be piped.

Description

TECHNICAL FIELD [0001] The present invention relates to a high-efficiency micro-bubble generating device, a floating separation device using the same, and a method of operating the same. BACKGROUND ART [0002]

The present invention relates to a high-efficiency micro-bubble generator, a floating separation apparatus using the same, and a method of using the same. More specifically, the present invention relates to an apparatus for efficiently supplying dissolved oxygen to an aeration tank for treating wastewater by supplying fine bubbles into polluted water, And a flotation separator using the flotation apparatus. [0002] The present invention relates to a high-efficiency microbubble generator for purifying contaminated water by causing micro flocs to adhere to micro flocs by floating the micro flocs.

In general, the oxygen supply device during the wastewater treatment process is a water treatment facility for effectively supplying dissolved oxygen in a biological reactor of activated sludge using microorganisms. The floatation type wastewater treatment device is a device for treating micro- micro floc is formed and then grown as a macro floc through coagulation assistant. At this time, micro-bubbles are adhered to remove macro-floc floating by buoyancy to remove various foreign substances. to be.

Fig. 1 is a schematic view showing the construction of such a flotation type sewage disposal apparatus.

Referring to FIG. 1, a conventional flotation type sewage treatment apparatus mixes an inorganic flocculant such as PAC (poly aluminum chloride) through rapid stirring to form a micro floc, A separate rapid mixing tank 10 and a constant speed mixing tank 20 for injecting a drug such as a polymer (coagulation assistant) were required to grow the size of the solution.

In addition, additional facilities such as a pressurizing tank and a circulation pump for installing a micro bubble generator for floating the generated macro floc were separately required.

Further, the structure 30 in which the air is introduced is formed separately, and the time required for the air injection process is separately required.

However, there has been a problem in that space and facilities for supplying the mixing bath and fine bubbles for mixing the chemicals are separately required, and the time required for each process is increased.

Korean Patent Registration No. 10-1054087

The present invention relates to a method and apparatus for supplying microbubbles to an aerobic microorganism during a wastewater treatment process to efficiently manage the dissolved oxygen concentration and to supply microbubbles for producing flocs and microbubbles Time and configuration of the micro-bubble generator, and a method of using the same.

It is another object of the present invention to provide a highly efficient micro-bubble generating device capable of guiding the flow of a flow rate change in order to float floating flocs with microbubbles attached thereto, a floating separation device using the same, and a method of using the same.

The objects of the present invention are not limited thereto, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

According to an embodiment of the present invention, there is provided an air conditioner comprising: a motor (210) disposed inside a contaminated water; A first plate 220 disposed at a lower end of the motor 210; A rotation shaft 230 mounted on the motor 210 and passing through the first plate 220; An impeller 240 mounted on the lower end of the rotary shaft 230 and rotating and having a first inlet hole 244 formed at the lower end thereof; A second plate 250 disposed at the lower end of the impeller 240 and having a hole 251 formed at the center thereof; And an inflow pipe 260 formed at one end thereof with the outflow hole 265 disposed to face the first inflow hole 244 through the hole 251; The impeller portion 240 includes a top plate 241 connected to a lower portion of the rotation shaft 230; A lower plate 242 spaced apart from the upper plate 241 by a predetermined distance and having a first inlet hole 244 formed at the center thereof; And a plurality of impeller blades (243) provided between the upper plate (241) and the lower plate (242); Wherein the impeller portion 243 has a curved shape from the inside to the outside and a space S in which a negative pressure is generated inside the impeller portion 240 by rotation of the impeller portion 240 , And the ratio of the area of the upper plate (241) of the impeller part (240) to the area of the first inlet hole (244) is 10% or more to 20% or less. to provide.

The other end of the inflow pipe 260 branches into a plurality of openings and one of the other ends opens toward the atmosphere to introduce air into the inflow pipe 260, And the first medicine flows into the inflow pipe (260) in communication with the tank (261).

In addition, a first valve 262 is formed at the other end of the inflow pipe 260 to open and close the other end of the inflow pipe 260, respectively.

In addition, a metering pump 263 is provided in the first medicine storage tank 261 to adjust the amount of the first medicine to be injected, thereby providing a highly efficient micro-bubble generator.

Also, the rotation frequency of the impeller blade (243) is 20 Hz to 60 Hz.

The outflow hole 265 is connected to the first inlet hole 244 so as to communicate with the space S in the impeller 240.

The outflow hole 265 is spaced apart from the first inflow hole 244 by a predetermined distance so that as the impeller 240 rotates, the contaminated water outside the impeller 240 and the outflow The air flowing out from the hole 265 flows into the first inlet hole 244 and flows into the internal space S of the impeller 240. [ have.

According to an embodiment of the present invention, a motor 210 'disposed in the atmosphere and having a motor through hole 211' formed therein in a vertical direction; A first plate 220 'disposed at the lower end of the motor 210'; A rotating shaft 230 'mounted on the motor 210' and rotating and having a rotating shaft hole 231 'passing through the first plate 220' and communicating with the motor through hole 211 '; An impeller 240 'mounted on the lower end of the rotary shaft 230' and rotating and having a second inlet hole 241a 'communicating with the rotary shaft hole 231'; And a second plate (250 ') disposed at the lower end of the impeller portion (240') and having a funnel shape inclined downward, wherein the motor through hole (211 ' The hole 231 'and the second inlet hole 241a' are positioned on the same axis to form an inlet L. The impeller 240 'is connected to the lower portion of the rotary shaft 230' An upper plate 241 'having the second inflow hole 241a' formed at the center thereof; A lower plate 242 'that is spaced apart from the upper plate 241' by a predetermined distance and disposed in parallel; And a plurality of impeller blades 243 'provided between the upper plate 241' and the lower plate 242 ', wherein the impeller blades 243' have a curved shape from the inner side to the outer side , And the ratio of the area of the upper plate (241 ') of the impeller part (240') to the area of the second inflow hole (241a ') is 10% or more to 20% or less. do.

Further, the rotation frequency of the impeller blade (243 ') is 20 Hz to 60 Hz, and a highly efficient micro-bubble generator can be provided.

According to an embodiment of the present invention, a mixing tank 100 in which a first internal space I1 is formed and polluted water introduced from the outside is stored in the first internal space I1; The fine bubble generator (200) according to any one of claims 1 to 9, which is installed in the first inner space (I1) and generates fine bubbles in the contaminated water. A floatation tank 300 in which a second internal space I2 is formed and the polluted water introduced from the first internal space I1 is stored in the second internal space I2; A connection pipe 400 installed so that a first inner space I1 of the mixing chamber 100 and a second inner space I2 of the floating tank 300 are communicated with each other; The present invention also provides a floating separation device using the high-efficiency microbubble generator.

The flotation tank 300 is installed in the second internal space I2 and has a baffle 310 for guiding fine bubbles combined with contaminants of polluted water flowing in the first internal space I1 to rise ); An angle adjuster 320 for adjusting the angle of the baffle 310; And a scraper portion (330) for removing floating matters floating on the polluted water stored in the second internal space (I2). The micro-bubble generating device according to the present invention can be provided with a micro-bubble generator.

In addition, the connection pipe 400 may include a second medicine storage tank 410 formed to inject the second medicine into the connection pipe 400; An injection pipe 420 for connecting the connection pipe 400 and the second medicine storage tank 410; And a second valve (430) for controlling an injection amount of the second medicine injected into the connection pipe (400). The micro-bubble generating device according to the present invention can be provided with a highly efficient micro-bubble generating device.

According to an embodiment of the present invention, a step S100 of storing contaminated water introduced from the outside into the first internal space I1 of the mixing chamber 100; An upper plate 241 connected to a lower portion of a rotary shaft 220 connected to the motor 210 by operating the motor 210 of the fine bubble generator 200 installed in the first inner space I1, (S200) rotating the impeller part 240 including the lower plate 242 which is spaced apart from the first impeller 241 by a predetermined distance and formed with a first inlet hole 244 at the center thereof; Generating a negative pressure in the space S by rotation of the impeller 240; (S400) in which the air and the first medicine are sucked into the space (S) by the negative pressure; The air and the first medicine are injected into the contaminated water by the centrifugal force generated by the rotation of the impeller portion 240 to mix the first medicine and the contaminated water while the air forms microbubbles S500); The first drug reacts with contaminants in the contaminated water to generate micro floc (S600); The micro flocs move in the direction of the connection pipe 400 according to the flow of the contaminated water and the micro flocs are flocculated by the polymer injected from the connection pipe 400 Creating a macro floc (S700); A step S800 of moving the macro floc along the baffle 310 in the flotation tank 300 by buoyancy of the microbubbles; And a step (S900) of collecting and removing the macro floc which has risen with the surface of the floating tank (300) by the scrapers (332); , Wherein a ratio of an area of the upper plate (241) of the impeller part (240) to an area of the first inlet hole (244) is 10% or more to 20% or less. And a method of operating the floating separation device.

According to the embodiment of the present invention, fine bubbles are supplied to the aerobic bioreactor under the aerobic bioreactor during the wastewater treatment process to effectively increase the dissolved oxygen concentration, and the drug for generating flocs in the flotation separation process is sprayed The present invention can provide a high-efficiency micro-bubble generator and a floating separation device using the same and a method of using the same, which can reduce the time and configuration required for the process operation by generating minute bubbles at the same time as the supply box.

Further, it is possible to provide a highly efficient micro-bubble generating device capable of guiding the flow of the flow rate change for floating the flocs when the micro-bubble-attached flocs move, a floating separation device using the same, and a method of using the same.

The objects of the present invention are not limited thereto, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

1 is a configuration diagram of a floating separation apparatus according to the prior art.
2 to 3 are conceptual diagrams of a high efficiency microbubble generator according to a first embodiment of the present invention and a floating separation apparatus using the same.
4 is a perspective view of a microbubble generator according to a first embodiment of the present invention.
5 is a cross-sectional view of a microbubble generator according to a first embodiment of the present invention.
6 is a cross-sectional view of an impeller according to a first embodiment of the present invention.
7 is a use state diagram of the microbubble generator according to the first embodiment of the present invention.
FIG. 8 is another use state diagram of the high efficiency microbubble generator and the floating separation apparatus using the same according to the first embodiment of the present invention.
FIG. 9 and FIG. 10 are photographs of a high-efficiency micro-bubble generating device and a floating separation device using the same according to the first embodiment of the present invention.
11 is a view showing an apparatus for generating micro-bubbles according to a second embodiment of the present invention.
12 is a cross-sectional view of the micro-bubble generator of Fig.
FIG. 13 is a photograph showing a photograph of a high-efficiency micro-bubble generating device and a floating separation device using the same according to a second embodiment of the present invention.
FIG. 14 is a flow chart of a high-efficiency micro-bubble generating device and an operation method of the floating separation device using the same according to the present invention.
15 is another embodiment of the apparatus for generating micro-bubbles according to the third embodiment of the present invention.
16 is a cross-sectional view of the micro-bubble generator of Fig.
17 is a photograph showing the apparatus for generating micro-bubbles according to the third embodiment of the present invention.
18 is a photograph showing a part of the apparatus 100 for generating fine bubbles in which the first inlet hole and the outlet hole are spaced apart from each other according to the third embodiment of the present invention.
FIG. 19A is a photograph of the contaminated water before microbubbles are generated, and FIG. 19B is a photograph showing microbubbles generated in the contaminated water through the microbubble generator according to the third embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments of the present invention can be modified in various forms, and the scope of the present invention should not be construed as being limited to the following embodiments. This embodiment is provided to more fully describe the present invention to those skilled in the art. The shape of the elements in the figures is therefore exaggerated to emphasize a clearer description.

FIGS. 2 to 3 are conceptual diagrams of a high efficiency microbubble generator according to a first embodiment of the present invention and a floating separation apparatus using the same. FIG. 4 is a perspective view of a microbubble generator according to a first embodiment of the present invention, FIG. 5 is a cross-sectional view of a micro-bubble generator according to a first embodiment of the present invention, and FIG. 6 is a cross-sectional view of an impeller according to a first embodiment of the present invention.

2 to 6, a high efficiency microbubble generator and a floating separation device 10 using the same are provided with a mixing tank 100, a microbubble generator 200, a floating tank 300, and a connection pipe 400 .

The mixing chamber 100 may have a first inner space I1 formed therein. In the first internal space I1, contaminated water introduced from the outside can be stored.

The fine bubble generator 200 is installed in the first inner space I1 and can generate minute bubbles in the contaminated water. The fine bubble generator 200 may include a motor 210, a first plate 220, a rotating shaft 230, an impeller 240, a second plate 250, and an inlet pipe 260 .

The motor 210 can be disposed inside the contaminated water in the first internal space I1.

The first plate 220 may be formed as a funnel shape inclined downward. The first plate 220 may be disposed at the lower end of the motor 210 and may have a hole formed at the center thereof.

The rotation shaft 230 is mounted on the lower end of the motor 210 and can rotate. The rotation axis 230 may be formed through the hole of the first plate 220.

The impeller 240 is mounted on the lower end of the rotating shaft 230 and can rotate. The impeller portion 240 can generate minute bubbles. At this time, the generated minute bubbles can be distributed along the bottom of the first plate 220 which is inclined downward. 6, the impeller portion 240 may include an upper plate 241, a lower plate 242, an impeller blade 243, and a first inlet hole 244.

The upper plate 241 may be connected to a lower portion of the rotation shaft 230. The upper plate 241 can be rotated in accordance with the rotation of the rotation shaft 230.

The lower plate 242 may be disposed parallel to the upper plate 241 at a predetermined interval. The lower plate 242 may have a first inlet hole 244 formed at the center thereof. The first inlet hole 244 may be connected to the inside of the impeller portion 240 from the outside. That is, the first inlet hole 244 is formed to allow air and chemicals to flow into the interior of the impeller portion 240.

The impeller blades 243 may be provided between the upper plate 241 and the lower plate 242. A plurality of impeller blades 243 may be formed. The impeller blade 243 can be rotated as the upper plate 241 rotates. The impeller blades 243 may be formed of a backward vane, that is, a backward curved vane, which reduces the resistance of the contaminated water during rotation. Further, the impeller blade 243 may be formed with a curved portion 243a so as to be curved outwardly from the inside. Therefore, a space S in which air, chemicals, and contaminated water can be mixed may be formed inside the impeller 240. Accordingly, the impeller blades 243 are formed in a vertically symmetrical manner, so that the fluid resistance is small and the wind pressure is high, so that a large amount of air can be supplied at the same depth. In addition, the resistance against the contaminated water can be minimized, and the rotational efficiency of the impeller blades 243 can be improved with relatively little power. The impeller blade 243 may be formed vertically between the upper plate 241 and the lower plate 242.

Accordingly, the impeller blades 243 can improve the mixing ratio of the chemicals by injecting the air by the first inflow hole 244 and the chemicals by the strong centrifugal force. The air and the chemicals with improved mixing ratio are made fine in the course of passing through the impeller part 240 and are injected into the water by the rotational force like micro bubbles.

The ratio of the diameter of the upper plate 241 of the impeller 240 to the diameter of the first inlet hole 244 may be 9% or more and 22% or less. More preferably, the ratio of the diameter of the upper plate 241 of the impeller portion 240 to the diameter of the first inlet hole 244 may be 10% or more and 20% or less. For example, when the diameter of the upper plate 241 of the impeller 240 is 0.3 m (300 mm), the diameter of the first inlet hole 244 may be 0.13 m.

The rotational frequency of the impeller blade 243 can be rotated from 20 Hz to 60 Hz. More preferably, the rotational frequency of the impeller blades 243 can be rotated from 30 Hz to 60 Hz. That is, the rotating speed can be varied depending on the capacity of the contaminated water to be treated and the area of the mixing chamber 100. For example, in order to smoothly diffuse the minute bubbles from the inside to the outside of the impeller portion 240, the rotational speed of the impeller blade 243 may be 20 Hz or more and 20 Hz to 60 Hz based on the quadrupole motor frequency.

The micro bubble generator 200 installed at a water depth of 1.5 m has a configuration in which the diameter of the upper plate 241 of the impeller 240 is 0.3 m (= 300 mm) The inflow hole 244 may be formed to be 0.13 m (130 mm), and the suction of the first medicine and the minute bubbles may be simultaneously performed at the rotation speed of 60 Hz of the impeller blade 243. However, since the rotation frequency may be changed according to the water depth, it must be operated at a minimum of 20 Hz and at least 570 rpm (preferably at least 30 Hz) in order to prevent the first drug diffusion efficiency from deteriorating.

The second plate 250 may be formed as a funnel shape inclined downward. The second plate 250 may be disposed at the lower end of the impeller portion 240. A hole 251 may be formed at the center of the second plate 250.

The inlet pipe 260 may be disposed so that one end thereof passes through the hole 251 and faces the first inlet hole 244. An outflow hole 265 may be formed at one end of the inflow pipe 260. Specifically, the outflow hole 265 is arranged to be connected to the first inflow hole 244, and one end of the inflow pipe 260 is connected to the first inflow hole 244 through the outflow hole 265. Therefore, the medicine or air introduced into the inflow pipe 260 can be introduced into the space S inside the impeller 240.

The other end of the inflow pipe 260 may be branched into a plurality of branches. Any one of the other ends of the inflow pipe 260 may be opened toward the atmosphere to allow air to flow into the inflow pipe 260. The other end of the inflow pipe 260 may communicate with the first medicine storage tank 261 to introduce the first medicine into the inflow pipe 260. That is, the first medicine flowing into the inlet pipe 260 may flow into the impeller 240 through the first inlet hole 244. The first valve 262 may be formed at the other end of the inflow pipe 260. The first valve 262 can control on / off of the air and the first medicine to be introduced into the inflow pipe 260. The first medicament may include an inorganic coagulant such as PAC (poly aluminum chloride). PAC can form a small size of micro bubbles. Accordingly, the microbubbles formed can be moved to the float tank 300 described later along the flow of the polluted water.

This inorganic coagulant is a mixture of several solid particles suspended in the contaminated water to make a lump or a micro floc formed by an inorganic coagulant to be added to a liquid to make a macro floc It means medicine. That is, the first medicine flowing through the inflow pipe 260 is distributed as the contaminated water like the micropore of the impeller 240 and flocculates with the floating material in the polluted water to form floc.

A metering pump 263 may be provided at the other end of the inflow pipe 260. The metering pump 263 can adjust the amount of air and the amount of the first medicine. That is, the amount of the first chemical to be injected varies depending on the processing capacity and the degree of contamination of the polluted water to be treated. The amount of the first chemical to be injected may be adjusted using the metering pump 263 to set the substrate removal rate of the polluted water.

Since the micro-bubble generating device 200 for injecting and mixing air and chemicals at the same time does not require a separate process for injecting the drug, unlike the conventional floatation separation device, the process time is shortened and the unnecessary configuration It is possible to increase the drug mixing efficiency.

The floating tank 300 may have a second inner space I2 formed therein. The floating tank 300 can store the contaminated water introduced from the first internal space I1 into the second internal space I2. The floating tank 300 may include a baffle 310 mounted in the second inner space I2 and guiding the fine bubbles flowing in the first inner space I1 to rise. That is, since the micro bubbles trapping the flocs passing through the connection pipe 400 described later rise along one side of the baffle 310, the micro bubbles are directed to the surface of the floatation vessel 300 It can be guided to rise. Referring to FIG. 3, the baffle 310 may include an angle adjuster 320 so that the angle is adjustable. Accordingly, when the water level in the floating tank 300 is changed through the change of the treatment flow rate, the angle of the baffle 310 can be adjusted when the floc of the contaminated water must be smoothly guided to the water surface. For example, when the level of the floating tank 300 is lowered due to a decrease in the process flow rate, the angle of the baffle 310 is gently laid down to the right to widen the macro floc toward the water surface of the second inner space I2 .

The float tank 300 may include a scraper portion 330 to remove floats floating on the contaminated water stored in the second internal space I2. The scraper portion 330 may include a body 331, a scraper 332, and a support member 333. The support member 333 may be installed above the floating tank 300. The body 331 may be mounted on the support member 333 and rotated to one side. The scraper 332 is installed on the body 331 and can remove floc floating on the water surface above the second inner space I2 as the body 331 rotates.

Generally, in the case of a wastewater treatment plant mixed solution in which a large amount of aerobic microorganisms exist, dissolved oxygen is consumed by microorganisms. Therefore, it is preferable to increase the dissolved oxygen amount (DO) consumed by the microorganism in the mixed solution of the wastewater treatment plant. In this embodiment, the DO concentration characteristics according to the diameter of the first inlet hole 244 of the impeller portion 240 and the diameter of the upper plate 241 are compared and analyzed.

[Experimental Example]

The ratio of the diameter of the upper plate 241 of the impeller portion 240 to the diameter of the first inlet hole 244 can be set to 10% or more and 20% or less to increase the dissolved oxygen amount DO of the mixing chamber 100 . As a basis for this, the following [Tables 1] to [Table 9] are the results of experiments and experiments in which the dissolved oxygen amount was measured according to the change of the air inflow amount.

Experimental conditions

- Experimental target water: aeration tank mixture of wastewater treatment facility

- Reactor Size: 30㎥

- Reactor conditions: water temperature 33 ~ 34 ℃, MLSS 9,000 ~ 10,000 mg / L

- DO meter: YSI 550A model

- Motor specification: 15kw, 4P, 60Hz (1720rpm)

- Do not stir air and reduce the DO to 0.1ppm by stirring, and then measure the maximum dissolved oxygen amount after running the prototype.

The ratio of the diameter of the upper plate 241 to the diameter of the first inflow hole 244 is set to be larger than the diameter of the first inflow hole 244 under the conditions that the rotational frequency of the impeller portion 240 (i.e., the rotational frequency of the impeller blade 243) is 60 Hz, 50 Hz, (DO) change in the mixing tank 100 according to the measurement of the dissolved oxygen amount (DO).

When the rotational frequency of the impeller 240 is different from 60 Hz, 50 Hz, and 30 Hz, and the diameter of the upper plate 241 is equal to 0.3 m (= 300 mm) 1 shows the DO concentration according to the area of the first inflow hole 244 / the area ratio (%) of the upper plate 241 according to the change of the diameter of the inflow hole 244.

Specifically, Table 1 shows a case where the rotational frequency of the impeller portion 240 is 60 Hz when the diameter of the upper plate 241 is 0.3 m (= 300 mm), and Table 2 shows the case where the diameter of the upper plate 241 is 0.3 the rotational frequency of the impeller portion 240 is 50 Hz when m (= 300 mm) and the rotational frequency of the impeller portion 240 is 50 Hz when the diameter of the upper plate 241 is 0.3 m (= 300 mm) . Thus, in Table 1 to Table 3, the DO concentration according to the area of the first inflow hole 244 / the area of the upper plate 241 (%) was measured according to the diameter change of the first inflow hole 244 will be.

Diameter of top plate (m)
(M)
Inflow area /
Top plate area (m ² )
Inflow area /
Percentage of top plate area (%)
DO (ppm)
0.3
0.04
0.01
One%
1.2
0.3
0.07
0.05
5%
1.8
0.3
0.09
0.09
9%
3.8
0.3
0.1
0.11
11%
4.5
0.3
0.12
0.16
16%
4.8
0.3
0.13
0.187
19%
5.1
0.3
0.14
0.217
22%
4.7
0.3
0.15
0.25
25%
2.8
0.3
0.17
0.32
32%
2.0

Diameter of top plate (m)
(M)
Inflow area /
Top plate area (m ² )
Inflow area /
Percentage of top plate area (%)
DO (ppm)
0.3
0.04
0.01
One%
0.9
0.3
0.07
0.05
5%
1.3
0.3
0.09
0.09
9%
3.5
0.3
0.1
0.11
11%
3.8
0.3
0.12
0.16
16%
4.2
0.3
0.13
0.187
19%
4.6
0.3
0.14
0.217
22%
3.8
0.3
0.15
0.25
25%
3.1
0.3
0.17
0.32
32%
2.5

Diameter of top plate (m)
(M)
Inflow area /
Top plate area (m ² )
Inflow area /
Percentage of top plate area (%)
DO (ppm)
0.3
0.04
0.01
One%
0.4
0.3
0.07
0.05
5%
0.8
0.3
0.09
0.09
9%
1.4
0.3
0.1
0.11
11%
1.8
0.3
0.12
0.16
16%
2.1
0.3
0.13
0.187
19%
2.1
0.3
0.14
0.217
22%
1.9
0.3
0.15
0.25
25%
0.9
0.3
0.17
0.32
32%
0.8

 [Table 1] to [Table 3] show that DO concentration is higher than other ranges in the case of not less than 9% and not more than 22%. Particularly, when the area of the first inflow hole 244 / the area ratio of the top plate 241 is 10% or more to 20% or less (preferably, 11% to 19%), the DO concentration is higher than the other cases. In addition, in the section where the area of the first inflow hole 244 / the area of the top plate 241 (%) is 9% or more and 19% or less, it is confirmed that the DO concentration increases as the diameter of the first inflow hole 244 increases .

However, when the area of the first inflow hole 244 / area ratio (%) of the upper plate 241 is the same, it can be seen that the DO concentration increases as the rotational frequency of the impeller 240 increases. Specifically, on the same condition that the diameter of the upper plate 241 is 0.3 m (= 300 mm) and the area of the first inflow hole 244 / the area of the upper plate 241 is 9% to 22% 240 Hz, 60 Hz, 50 Hz, and 30 Hz, respectively.

For example, when the impeller portion 240 in Table 1 is the same condition that the first inflow hole 244 area / the top plate 241 area ratio (%) is 19% in Tables 1 to 3, The DO concentration is 5.1 when the rotational frequency of the impeller portion 240 is 60 Hz and the DO concentration is 4.6 when the rotational frequency of the impeller portion 240 is 50 Hz in Table 2. In Table 3, At 30 Hz, DO concentration was 2.1.

That is, it can be seen that the DO concentration increases as the rotational frequency of the impeller 240 increases with the same area of the first inflow hole 244 / area 241 of the upper plate 241.

When the rotational frequency of the impeller 240 is different from 60 Hz, 50 Hz and 30 Hz, and the diameter of the upper plate 241 is equal to 0.2 m (= 200 mm) 1 shows the DO concentration according to the area of the first inflow hole 244 / the area ratio (%) of the upper plate 241 according to the change of the diameter of the inflow hole 244.

Specifically, Table 4 shows the case where the rotational frequency of the impeller portion 240 is 60 Hz when the diameter of the upper plate 241 is 0.2 m (= 200 mm), and Table 5 shows the case where the diameter of the upper plate 241 is 0.2 the rotational frequency of the impeller 240 is 50 Hz when m (= 200 mm) and the rotational frequency of the impeller 240 is 50 Hz when the diameter of the upper plate 241 is 0.2 m (= 200 mm) . Thus, in Table 4 to Table 6, the DO concentration according to the area of the first inflow hole 244 / the area of the upper plate 241 (%) was measured according to the diameter change of the first inflow hole 244 will be.

Diameter of top plate (m)
(M)
Inflow area /
Floor area (m2)
Inflow area /
Percentage of top plate area (%)
DO (ppm)
0.2
0.04
0.04
4%
1.1
0.2
0.05
0.06
6%
1.5
0.2
0.06
0.09
9%
3.6
0.2
0.07
0.12
12%
4.1
0.2
0.08
0.16
16%
4.3
0.2
0.09
0.2
20%
4.1
0.2
0.1
0.25
25%
2.8
0.2
0.12
0.36
36%
2.2

Diameter of top plate (m)
(M)
Inflow area /
Floor area (m2)
Inflow area /
Percentage of top plate area (%)
DO (ppm)
0.2
0.04
0.04
4%
0.7
0.2
0.05
0.06
6%
0.9
0.2
0.06
0.09
9%
1.5
0.2
0.07
0.12
12%
1.8
0.2
0.08
0.16
16%
2
0.2
0.09
0.2
20%
2.1
0.2
0.1
0.25
25%
1.0
0.2
0.12
0.36
36%
0.8

Diameter of top plate (m)
(M)
Inflow area /
Top plate area (m ² )
Inflow area /
Percentage of top plate area (%)
DO (ppm)
0.2
0.04
0.04
4%
0.3
0.2
0.05
0.06
6%
0.4
0.2
0.06
0.09
9%
0.9
0.2
0.07
0.12
12%
1.2
0.2
0.08
0.16
16%
1.4
0.2
0.09
0.2
20%
1.3
0.2
0.1
0.25
25%
0.5
0.2
0.12
0.36
36%
0.4

[Table 4] to [Table 6] show that DO concentration is higher than other ranges in the case of not less than 9% and not more than 20%.

However, it can be seen that the DO concentration increases as the rotational frequency of the impeller 240 increases on the same ratio of the area of the first inflow hole 244 / the area of the upper plate 241. Specifically, on the same condition that the diameter of the upper plate 241 is 0.2 m (= 200 mm), the area of the first inlet hole 244 / the area ratio (%) of the upper plate 241 is 9% 240) are 60 Hz, 50 Hz, and 30 Hz, respectively.

For example, when the rotational frequency of the impeller portion 240 is 60 Hz in the same condition that the area of the first inflow hole 244 / the area ratio of the top plate 241 is 16% The DO concentration is 2 ppm when the rotational frequency of the impeller 240 is 50 Hz and the DO concentration is 1.4 when the rotational frequency of the impeller 240 is 30 Hz in Table 5. In Table 5, ppm.

That is, it can be seen that the DO concentration increases as the rotational frequency of the impeller 240 increases with the same area of the first inflow hole 244 / area 241 of the upper plate 241.

When the rotational frequency of the impeller 240 is different from 60 Hz, 50 Hz, and 30 Hz, and the diameter of the upper plate 241 is equal to 0.4 m (= 400 mm), [Table 4] 1 shows the DO concentration according to the area of the first inflow hole 244 / the area ratio (%) of the upper plate 241 according to the change of the diameter of the inflow hole 244. Specifically, Table 7 shows the case where the rotational frequency of the impeller portion 240 is 60 Hz when the diameter of the upper plate 241 is 0.4 m (= 400 mm), and Table 8 shows the case where the diameter of the upper plate 241 is 0.4 Table 9 shows the case where the rotational frequency of the impeller portion 240 is 30 Hz when the diameter of the upper plate 241 is 0.4 m (= 400 mm), and the rotational frequency of the impeller portion 240 when m (= 400 mm) . Thus, in Table 7 to Table 9, the DO concentration according to the area of the first inflow hole 244 / the area of the upper plate 241 (%) was measured according to the diameter change of the first inflow hole 244 will be.

Diameter of top plate (m)
(M)
Inflow area /
Top plate area (m ² )
Inflow area /
Percentage of top plate area (%)
DO (ppm)
0.4
0.08
0.04
4%
1.8
0.4
0.1
0.06
6%
2.2
0.4
0.12
0.09
9%
3.4
0.4
0.13
0.105
11%
4.8
0.4
0.16
0.16
16%
6.3
0.4
0.18
0.2
20%
6.2
0.4
0.19
0.225
23%
2.7
0.4
0.22
0.3
30%
2.4

Diameter of top plate (m)
(M)
Inflow area /
Top plate area (m ² )
Inflow area /
Percentage of top plate area (%)
DO (ppm)
0.4
0.08
0.04
4%
1.5
0.4
0.1
0.06
6%
2.8
0.4
0.12
0.09
9%
3.9
0.4
0.13
0.105
11%
4.6
0.4
0.16
0.16
16%
6.2
0.4
0.18
0.2
20%
6
0.4
0.19
0.225
23%
2.9
0.4
0.22
0.3
30%
2.6

Diameter of top plate (m)
(M)
Inflow area /
Top plate area (m ² )
Inflow area /
Percentage of top plate area (%)
DO (ppm)
0.4
0.08
0.04
4%
1.1
0.4
0.1
0.06
6%
1.7
0.4
0.12
0.09
9%
2.0
0.4
0.13
0.105
11%
2.2
0.4
0.16
0.16
16%
3.3
0.4
0.18
0.2
20%
3.2
0.4
0.19
0.225
23%
1.8
0.4
0.22
0.3
30%
1.5

[Table 7] to [Table 9] show that DO concentration is higher than other ranges in the case of not less than 9% and not more than 20%.

However, it can be seen that the DO concentration increases as the rotational frequency of the impeller 240 increases on the same ratio of the area of the first inflow hole 244 / the area of the upper plate 241. Specifically, when the diameter of the upper plate 241 is 0.4 m (= 400 mm), the area of the first inlet hole 244 / area ratio (%) of the upper plate 241 is 9% It can be confirmed that the DO concentration is lowered in the order of the rotational frequencies of 60 Hz, 50 Hz, and 30 Hz.

For example, when the rotational frequency of the impeller portion 240 is 60 Hz in the same condition that the area of the first inflow hole 244 / area ratio of the top plate 241 is 16% The DO concentration is 6.2 ppm when the rotational frequency of the impeller 240 is 50 Hz and the DO concentration is 30 Hz when the rotational frequency of the impeller 240 is 30 Hz in Table 9. In Table 9, Respectively. That is, it can be seen that the DO concentration increases as the rotational frequency of the impeller 240 increases with the same area of the first inflow hole 244 / area 241 of the upper plate 241.

The experimental results shown in [Table 1] to [Table 9] show that as the area of the first inflow hole 244 into which the air flows is increased, the air inflow amount increases and the dissolved oxygen amount DO) increases.

The area of the first inflow hole 244 / the area ratio (%) of the top plate 241 is 9% or more and 22% or less when the diameter of the top plate 241 is 0.3 m in [Table 1] The range was found to be higher DO concentration.

The area of the first inflow hole 244 / the area ratio (%) of the top plate 241 is not less than 9% and not more than 20% when the diameter of the top plate 241 is 0.2 m in [Table 4] The range was found to be higher DO concentration.

The area of the first inflow hole 244 / the area ratio (%) of the top plate 241 is not less than 9% and not more than 20% when the diameter of the top plate 241 is 0.4 m in [Table 7] The range was found to be higher DO concentration.

Accordingly, the ratio of the area of the upper plate 241 included in all cases of Table 1 to Table 9 and the area of the first inflow hole 244 is 10% or more and 20% or less. That is, when the area of the top plate 241 and the area of the first inflow hole 244 is 10% or more and 20% or less, the dissolved oxygen amount DO can be increased to increase the fine bubble generation efficiency.

However, when the area of the first inflow hole 244 / the area ratio of the top plate 241 exceeds a certain ratio (about 23% or more), the area of the first inflow hole 244 is enlarged to increase the air inflow However, it was confirmed that the dissolved oxygen amount (DO) concentration of the mixing tank 100 was decreased.

This is because the efficiency of generating fine bubbles by the rotation of the impeller 240 is reduced and the oxygen transmission rate is reduced even though the air supply amount is increased. In other words, an increase in the area of the first inflow hole 244 in the pipe of the same wind pressure becomes proportional to the air supply amount. However, the air supply amount larger than the supply amount capable of generating the minute bubbles in the impeller portion 240 forms large bubbles, which may cause the oxygen delivery efficiency to be lowered.

When the rotational frequency of the impeller portion 240 in Table 1 is 60 Hz (see Table 1), the rotational frequency of the impeller portion 240 in Table 1 is 60 Hz The DO concentration was higher than when the rotational frequencies of [Table 2] and [Table 3] were 50 Hz and 30 Hz, respectively.

Similarly, in the condition of the same ratio of the area of the first inflow hole 244 and the area of the upper plate 241 in [Table 4] to [Table 6] and [Table 7] The DO concentration was higher than that when the rotational frequency was 50Hz and 30Hz.

That is, it can be seen that the increase in the rotational speed of the impeller portion 240 leads to an increase in the oxygen transmission rate.

In this regard, the rotation frequency of the impeller blade 243 is 30 Hz to 60 Hz (preferably, 50 Hz to 60 Hz) on the basis of the quadruple motor frequency, and the fine bubbles are smoothly diffused from the inside to the outside of the impeller portion 240 . As a basis for this, experiments and results of measuring the dissolved oxygen amount according to the number of revolutions of the motor as described below were derived. Since the rotational frequency of the impeller blade 243 corresponds to the rotational frequency of the motor, the amount of dissolved oxygen was measured according to the number of rotations of the motor in the following experiment.

In general, the mixing tank 100 is an environment in which the consumption of dissolved oxygen continuously occurs under the condition of aerobic substrate decomposition of wastewater and activated sludge continuously. Accordingly, the concentration of dissolved oxygen (DO) in the mixing chamber 100 increases or decreases with the change in the amount of dissolved oxygen. Therefore, when the rotational frequency of the prototype is set as an operating variable under the same operating condition, the optimum rotational frequency range can be found by measuring the dissolved oxygen amount (DO) concentration of the mixing tank 100 during operation.

The motor specifications of the prototype used in the experiment are 15 kW, 4 P, 60 Hz (1720 rpm), the diameter of the impeller upper plate 241 is 0.3 m, and the diameter of the first inflow hole 244 is 0.13 m.

The experimental conditions are shown in the table below.

- Reactor conditions: Bioreactor for treatment of wastewater (430 m ³ ), water temperature 34 ° C, MLSS 9,000 mg / L, wastewater inflow rate 130 m ³ / hr

- Prototype operating conditions: Analysis of the effect of increasing the number of revolutions and DO concentration (DO ppm) in the bioreactor with increasing operating frequency; Same blowing volume

- DO meter: YSI 550A model

Experiments were conducted to determine the amount of dissolved oxygen in the mixing chamber 100 according to the increase in the rotational frequency of the motor under the above experimental conditions. As a result, the results as shown in the following table were obtained.

division Condition 1 Condition 2 Condition 3 Condition 4 Condition 5 Condition 6 Condition 7 Remarks frequency 0 10 20 30 40 50 60 Hz Dissolved oxygen amount (DO) 0.3 0.8 1.8 3.2 3.7 4.8 5.2 ppm Operating load (amperes) 0 8.9 11.2 13.4 15.4 18.5 22.5 A

As shown in the above table, the concentration of the dissolved oxygen amount DO gradually increases in accordance with an increase in the rotational frequency of the motor (i.e., an increase in rotational frequency of the impeller blade 243).

First, it was measured that the dissolved oxygen amount (DO) was maintained at less than 1 ppm when the rotational frequency was less than 20 Hz. It can be confirmed that the oxygen transmission rate is lowered due to the reduction of the micro bubble generation rate due to the decrease of the rotation speed of the impeller blade 243 at 10 Hz or less. For example, when the mixing tank 100 is not smoothly stirred or the oxygen transmission rate is decreased, the dissolved oxygen amount DO of the mixing tank 100 is decreased.

On the other hand, when the rotation frequency is in the range of 20 Hz to 60 Hz, the rotation frequency is 1.8 ppm to 5.2 ppm. Particularly, when the rotational frequency was in the range of 50 Hz to 60 Hz, the rotational frequency was 4.8 ppm to 5.2 ppm, and the increase in the dissolved oxygen amount (DO) concentration was confirmed. In particular, under condition 7, which is the maximum rotational frequency of the rotational frequency, the dissolved oxygen amount (DO) increases to 5.2 ppm. However, it is not possible to increase the frequency more than the rated frequency 60Hz in Korea at present. Therefore, fine bubbles can be smoothly diffused from the inside of the impeller portion 240 to the outside.

Therefore, the ratio of the area of the upper plate 241 of the impeller portion 240 to the area of the first inlet hole 244 is 10% or more and 20% or less, and the characteristic that the rotational frequency of the impeller portion 240 is 20 Hz to 60 Hz Increases the dissolved oxygen amount (DO) of the mixing tank 100, thereby increasing the fine bubble generation efficiency.

7 is a use state diagram of the microbubble generator according to the first embodiment of the present invention.

Referring to FIG. 7, the connection pipe 400 may be installed between the first inner space I1 of the mixing chamber 100 and the second inner space I2 of the floating tank 300. That is, the connection pipe 400 can be installed so that the first inner space I1 of the mixing chamber 100 and the second inner space I2 of the floating tank 300 are communicated with each other. The connection pipe 400 may include a second medicine storage tank 410 for injecting the second medicine into the connection pipe 400. The second medicament may include a polymer or the like that increases the size of micro flocs passing through the connector tube 400. That is, the coagulation assistant (second medicine) may be supplied into the connection pipe 400. The supplied coagulant aid (second drug) can increase the size of micro flocs combined with micropores into macro flocs. Accordingly, a plurality of minute bubbles can be combined with the macro floc whose size is increased, so that the microbubbles float in the floating tank 300. The connection pipe 400 may include an injection pipe 420 through which the second medicine passes by connecting the second medicine storage tank 410 and the connection pipe 400. The connection pipe 400 may include a second valve 430 for controlling a second medicine to be injected into the connection pipe 400. Accordingly, the second valve 430 can generate an optimal macro floc by controlling the second medicine to be injected according to the volume of the mixing chamber 100 and the volume of the micro flocs.

FIG. 8 is another use state diagram of the high efficiency microbubble generator and the floating separation apparatus using the same according to the first embodiment of the present invention.

Referring to FIG. 8, a plurality of micro-bubble generating devices 200 may be provided for shortening the mixing time of the first medicines, increasing the contaminated water treatment capacity, increasing the amount of injected medicines, and increasing the amount of microbubbles generated. Although three micro-bubble generating devices 200 are provided in Fig. 8, the number of micro-bubble generating devices 200 is not necessarily limited to this, and the number of micro-bubble generating devices 200 can be changed in accordance with a target drug mixing time.

FIG. 9 and FIG. 10 are photographs of a high-efficiency micro-bubble generating device and a floating separation device using the same according to the first embodiment of the present invention.

9 and 10, FIG. 9 is a view showing a fine bubble generating device 200 installed in the first inner space I1 of the mixing chamber 100. As shown in FIG. 10 is a view showing the motor 210, the first plate 220, the rotating shaft 230, the impeller 240 and the second plate 250 of the apparatus 100 for producing fine bubbles.

11 is a cross-sectional view of the apparatus for generating fine bubbles according to a second embodiment of the present invention, FIG. 12 is a cross-sectional view of the apparatus for generating fine bubbles in FIG. 11, FIG. 1 is a photographic view of a generator and a floating separation apparatus using the same.

11 to 13, the fine bubble generator 200 includes a motor 210 ', a first plate 220', a rotating shaft 230 ', an impeller 240' and a second plate 250 ' ).

The motor 210 'may be placed in the atmosphere. Therefore, the risk of failure is lower than when placed in water. The motor 210 'may be formed with a motor through hole 211' passing vertically through the center thereof.

The first plate 220 'may be formed as a downwardly inclined funnel shape. The first plate 220 'may be disposed at the lower end of the motor 210' and a hole may be formed at the center.

The rotary shaft 230 'is mounted on the lower end of the motor 210' and can rotate. The rotation axis 230 'may be formed through the hole of the first plate 220'. The rotary shaft 230 'may be formed at the center thereof with a rotary shaft hole 231' communicating with the motor through hole 211 '.

The impeller 240 'is attached to the lower end of the rotating shaft 230' and can rotate. The impeller portion 240 'can generate minute bubbles. At this time, the generated minute bubbles can be distributed along the bottom of the first plate 220 'which is inclined downward. Referring to FIG. 10, the impeller portion 240 'may include an upper plate 241', a lower plate 242 ', an impeller blade 243', and an impeller through hole 244 '.

The upper plate 241 'may be connected to the lower portion of the rotation shaft 230'. A second inflow hole 241a 'may be formed in the center of the upper plate 241'. The second inlet hole 241a 'may be formed at the center of the upper plate 241' in communication with the rotation shaft hole 231 '. The second inlet hole 241a 'may be connected to the inside of the impeller portion 240' from the outside. That is, the second inflow hole 241a 'is formed such that at least one of air and chemicals can be introduced into the impeller 240'.

The lower plate 242 'may be disposed parallel to the upper plate 241' with a predetermined distance therebetween.

The impeller blade 243 'may be provided between the upper plate 241' and the lower plate 242 '. A plurality of impeller blades 243 'may be formed. The impeller blade 243 'can be rotated as the upper plate 241' rotates. The impeller blade 243 'may be formed with a backward vane, that is, a backward curved vane, which reduces the resistance of the contaminated water during rotation. Further, the impeller blade 243 'may be formed with a curved portion 243a' so as to be curved inward from the inside. Therefore, a space S in which air and chemicals can be mixed can be formed inside the impeller portion 240 '. Accordingly, the impeller blades 243 'are formed in a vertically symmetrical manner, so that the fluid resistance is small and the wind pressure is high, so that a large amount of air can be supplied at the same depth. In addition, the resistance to the contaminated water can be minimized, and the rotational efficiency of the impeller blades 243 'can be improved with relatively little power. The impeller blade 243 'may be formed vertically between the upper plate 241' and the lower plate 242 '.

Therefore, the mixing ratio of the contaminated water can be improved by the air and the chemicals introduced into the impeller blade 243 'from the second inflow hole 241a'. The air and the contaminated water with improved mixing ratio can be miniaturized in the process of passing through the impeller portion 240 'to generate minute bubbles.

The second plate 250 'may be formed as a downwardly inclined funnel shape. The second plate 250 'may be disposed at the lower end of the impeller portion 240'.

The motor through hole 211 ', the rotating shaft hole 231' and the second inlet hole 241a 'of the thus formed fine bubble generator 200 are vertically penetrated and the inside of the impeller portion 240' An inflow path L communicating with the inflow path L can be formed. That is, at least one of the air and the first medicine may be injected from the outside and introduced into the impeller portion 240 '. Further, the introduced air and the first chemical may be mixed and formed into a microcapsule.

The micro bubble generator of another embodiment of the present invention includes the first medicine storage tank 261, the first valve 262, and the metering pump 263 in the same manner as the micro-bubble generator 200 of the embodiment, And the amount of the first drug to be injected may be adjusted.

The ratio of the lateral area of the impeller portion 240 'to the lateral area of the second inlet hole 241a' is 1: 0.1 or more to 0.2 or less and the frequency of the impeller blade 243 'is 20 Hz to 60 Hz. The effect to be achieved is also the same.

FIG. 14 is a flow chart of a high-efficiency micro-bubble generating device and an operation method of the floating separation device using the same according to the present invention.

Referring to FIG. 14, a high-efficiency micro-bubble generator and an operation method of the floating separator using the same will be described. A highly efficient micro-bubble generator and an operation method of the floating separator using the same, (S100), which is stored in the first internal space (I1).

The step S200 of rotating the impeller 240 by driving the motor 210 of the fine bubble generator 200 installed in the first internal space I1 may be included.

And generating a negative pressure in the space S by rotation of the impeller 240 (S300).

(S400) in which the air and the first medicine are sucked into the space S by the negative pressure. At this time, the sucked air and the first medicine are injected through the inflow pipe 260, and the inflow pipe 260 is provided with the metering pump 263, so that the correct amount of air and the first medicine are injected into the impeller 240 .

And a step S500 of mixing the first medicine and the contaminated water while the air and the first medicine are injected into the contaminated water by the centrifugal force generated by the rotation of the impeller portion 240 so that the air forms fine bubbles .

And a step (S600) in which the first chemical reacts with the contaminants in the contaminated water to generate micro flocs. That is, the inorganic flocculant of PAC (poly aluminum chloride) as a raw material of the first medicine reacts with the suspended substance contained in the contaminated water to generate micro floc.

The micro floc moves toward the connection pipe 400 in accordance with the flow of the polluted water and the micro floc flocculates due to the polymer injected from the connection pipe 400, floc (step S700).

(Step S800) in which the macro floc rises along the baffle 310 in the floating tank 300 by buoyancy of the microbubbles. At this time, the baffle 310 can be gently inclined so that the macro floc is not destroyed when the amount of the rising macro floc is large.

And a step (S900) in which the macro floc which has risen from the water surface of the floating tank 300 is collected and removed by the scraper 332. At this time, a plurality of scrapers including the scrapers 332 are installed on the float tank 300 to remove the raised macro flocs.

Suspended substances in the contaminated water can be removed in the above sequence.

The charged polluted water flows into the micro-bubble generator 200 installed in the first internal space I1 and generates micro-bubbles by using the first medicine and air. At this time, the generated micro-bubbles are mixed with an inorganic coagulant such as poly aluminum chloride (PAC), which is a raw material of the first medicine, to coagulate with the suspended substances contained in the contaminated water to generate micro flocs (S200) .

The generated micro floc moves in the direction of the connection pipe 400 according to the flow of the polluted water and is combined with the polymer injected from the connection pipe 400 to generate macro floc (S300). These macro flocs are bulkier than micro flocs.

 Therefore, the bulky macro floc includes step S400 in which a plurality of minute bubbles adhere to each other and float up to the floating vessel 300 by buoyancy. At this time, the rising macro floc moves in the direction of the floating tank 300 in accordance with the flow of the polluted water, and can be lifted up along the baffle 310 inclined at an angle to prevent the macro floc from being destroyed. have.

The floc which has risen above the floating tank 300 is removed by the scraper portion 330 (S500).

Suspended substances in contaminated water can be removed as described above.

15 is a sectional view of a micro-bubble generator according to a third embodiment of the present invention, FIG. 16 is a cross-sectional view of the micro-bubble generator of FIG. 15, 18 is a photograph showing a part of the apparatus 100 for generating fine bubbles in which the first inlet hole and the outlet hole are spaced apart from each other according to the third embodiment of the present invention, FIG. 19B is a photograph showing the generation of micro-bubbles in the contaminated water through the apparatus for generating micro-bubbles according to the third embodiment of the present invention.

Referring to FIGS. 15 and 16, the apparatus 100 for generating micro-bubbles may be installed in the first internal space I1 to generate micro-bubbles in the contaminated water. The fine bubble generator 200 may include a motor 210, a first plate 220, a rotating shaft 230, an impeller 240, a second plate 250, and an inlet pipe 260 .

The motor 210 can be disposed inside the contaminated water in the first internal space I1.

The first plate 220 may be formed as a funnel shape inclined downward. The first plate 220 may be disposed at the lower end of the motor 210 and may have a hole formed at the center thereof.

The rotation shaft 230 is mounted on the lower end of the motor 210 and can rotate. The rotation axis 230 may be formed through the hole of the first plate 220.

The impeller 240 is mounted on the lower end of the rotating shaft 230 and can rotate. The impeller portion 240 can generate minute bubbles. At this time, the generated minute bubbles can be distributed along the bottom of the first plate 220 which is inclined downward. 16, the impeller portion 240 may include an upper plate 241, a lower plate 242, an impeller blade 243, and a first inlet hole 244.

The upper plate 241 may be connected to a lower portion of the rotation shaft 230. The upper plate 241 can be rotated in accordance with the rotation of the rotation shaft 230.

The lower plate 242 may be disposed parallel to the upper plate 241 at a predetermined interval. The lower plate 242 may have a first inlet hole 244 formed at the center thereof. The first inlet hole 244 may be connected to the inside of the impeller portion 240 from the outside. That is, the first inlet hole 244 is formed to allow air and chemicals to flow into the interior of the impeller portion 240.

The impeller blades 243 may be provided between the upper plate 241 and the lower plate 242. A plurality of impeller blades 243 may be formed. The impeller blade 243 can be rotated as the upper plate 241 rotates. The impeller blades 243 may be formed of a backward vane, that is, a backward curved vane, which reduces the resistance of the contaminated water during rotation. Further, the impeller blade 243 may be formed with a curved portion 243a so as to be curved outwardly from the inside. Therefore, a space S in which air, chemicals, and contaminated water can be mixed may be formed inside the impeller 240. Accordingly, the impeller blades 243 are formed in a vertically symmetrical manner, so that the fluid resistance is small and the wind pressure is high, so that a large amount of air can be supplied at the same depth. In addition, the resistance against the contaminated water can be minimized, and the rotational efficiency of the impeller blades 243 can be improved with relatively little power. The impeller blade 243 may be formed vertically between the upper plate 241 and the lower plate 242.

Accordingly, the impeller blades 243 can improve the mixing ratio of the chemicals by injecting the air by the first inflow hole 244 and the chemicals by the strong centrifugal force. The air and the chemicals with improved mixing ratio are made fine in the course of passing through the impeller part 240 and are injected into the water by the rotational force like micro bubbles.

The second plate 250 may be formed as a funnel shape inclined downward. The second plate 250 may be disposed at the lower end of the impeller portion 240. A hole 251 may be formed at the center of the second plate 250.

The inlet pipe 260 may be disposed so that one end thereof passes through the hole 251 and faces the first inlet hole 244. An outflow hole 265 may be formed at one end of the inflow pipe 260. Specifically, the outflow hole 265 may be disposed above and below the first inflow hole 244. The outlet hole 265 may be spaced apart from the first inlet hole 244 by a predetermined distance (about 20 mm). The outflow hole 265 may be formed to have a diameter corresponding to the first inflow hole 244.

 A pressure difference is generated between the inside and the outside of the impeller portion 240 as the impeller portion 240 rotates at a high speed so that water (that is, contamination) is generated in the first inlet hole 244 of the impeller portion 240 Water) and air. More specifically, due to the pressure difference between the inside and the outside of the impeller portion 240, the air or chemicals flowing out of the outflow hole 265 of the inflow pipe 260 and the contaminated water outside the impeller portion 240 (S) of the impeller portion (240) through the through hole (244).

The other end of the inflow pipe 260 may be branched into a plurality of branches. Any one of the other ends of the inflow pipe 260 may be opened toward the atmosphere to allow air to flow into the inflow pipe 260. The other end of the inflow pipe 260 may communicate with the first medicine storage tank 261 to introduce the first medicine into the inflow pipe 260. That is, the first medicine flowing into the inlet pipe 260 may flow into the impeller 240 through the first inlet hole 244. The first valve 262 may be formed at the other end of the inflow pipe 260. The first valve 262 can control on / off of the air and the first medicine to be introduced into the inflow pipe 260. The first medicament may include an inorganic coagulant such as PAC (poly aluminum chloride). PAC can form a small size of micro bubbles. Accordingly, the microbubbles formed can be moved to the float tank 300 described later along the flow of the polluted water.

By separating the inflow pipe 260 from the first inflow hole 244, contaminated water and air can be introduced into the first inflow hole 244 together with the first inflow hole 244. In this case, the increase in DO concentration can be confirmed in the following experiment.

The first inlet holes 244 formed in the lower plate 242 of the outflow hole 265 and the impeller portion 240 are larger than the first inlet holes 244 formed in the impeller portion 240, The mixed water is mixed with the air and mixed into the impeller 240 by the rotational force of the impeller 240.

In this experiment, 10% of the diameter of the upper plate 241 and the diameter of the first inlet hole 244 were compared with each other under the following conditions.

Table 11 shows the relationship between the rotational frequency of the impeller portion 240 and the rotational speed of the impeller portion 240, the diameter of the top plate 241 of 0.3 m (= 300 mm), the diameter of the first inlet hole 244 of 0.095 m 10 mm, 20 mm, 30 mm, 40 mm, and 50 mm between the first inlet hole 244 and the outlet hole 265 when the diameter was 0.095 (= 95 mm).

Table 12 shows the relationship between the rotational frequency of the impeller 240 and the diameter of the top plate 241 of 0.2 mm (= 200 mm), the diameter of the first inflow hole 244 of 0.065 m (= 65 mm), the diameter of the outflow hole 265 10 mm, 20 mm, 30 mm, 40 mm, and 50 mm between the first inlet hole 244 and the outlet hole 265 when the diameter was 0.065 (= 65 mm).

Table 13 shows the relationship between the rotation frequency of the impeller 240 and the rotation frequency of the impeller 240, the diameter of the upper plate 241 of 0.4 m (= 400 mm), the diameter of the first inlet hole 244 of 0.104 m 10 mm, 20 mm, 30 mm, 40 mm, and 50 mm between the first inlet hole 244 and the outlet hole 265 when the diameter was 0.104 (= 104 mm).

Diameter of top plate (m) Air inflow Public diameter = air inflow pipe diameter (m) Inflow area /
Percentage of top plate area (%) Lower plate air inflow course
Air intake pipe clearance (mm) DO (ppm) 0.3 0.095 10 0 4.2 0.3 0.095 10 10 5.2 0.3 0.095 10 20 5.9 0.3 0.095 10 30 5.5 0.3 0.095 10 40 3.8 0.3 0.095 10 50 2.9

Diameter of top plate (m) Air inflow Public diameter = air inflow pipe diameter (m) Inflow area /
Percentage of top plate area (%) Lower plate air inflow course
Air intake pipe clearance (mm) DO (ppm) 0.2 0.065 10 0 3.8 0.2 0.065 10 10 4.7 0.2 0.065 10 20 5.1 0.2 0.065 10 30 4.9 0.2 0.065 10 40 3.1 0.2 0.065 10 50 2.2

Diameter of top plate (m) Air inflow Public diameter = air inflow pipe diameter (m) Inflow area /
Percentage of top plate area (%) Lower plate air inflow course
Air intake pipe clearance (mm) DO (ppm) 0.4 0.104 10 0 4.8 0.4 0.104 10 10 5.5 0.4 0.104 10 20 6.2 0.4 0.104 10 30 6.0 0.4 0.104 10 40 4.4 0.4 0.104 10 50 4.1

In a comparative experiment on the separation distance between the first inlet hole 244 and the outlet hole 265 of the impeller portion 240 shown in Tables 11 to 13, the first inlet hole 244 and the outlet hole 245, The DO concentration is the highest when the separation distance of the first electrode 265 is 20 mm. The first inlet hole 244 and the second inlet hole 244 are formed to be equal to each other when the distance between the first inlet hole 244 and the outlet hole 265 is zero, ) And the outflow hole 265 is 10 mm or more and 30 mm or less, it can be seen that the DO concentration is increased.

As described above, it can be confirmed that when the contaminated water and the air are mixed with each other and introduced into the impeller by the separation between the first inflow hole 244 and the outflow hole 265, the amount of minute bubbles generated increases and the oxygen transmission rate improves.

However, if the clearance increases by 30 mm or more, the air supply amount decreases to the inside of the impeller portion 240 due to a physical collision between the water and the air, and the oxygen transmission rate is lowered. The first inflow hole 244 and the outflow hole It is determined that the optimum design range is applied in the range of 10 to 30 mm of the clearance of the protrusion 265.

That is, the apparatus 200 for generating micro-bubbles according to the second embodiment of the present invention enhances the efficiency of generating fine bubbles by mixing water and air, and improves the oxygen transmission rate of the entire reactor by improving the diffusion efficiency of the mixture of water and air appear.

19A and 19B are photographs of contaminated water before microbubbles are generated, FIG. 19B is a photograph showing microbubbles generated in the contaminated water through the microbubble generator according to the third embodiment of the present invention, to be. Comparing FIGS. 19A and 19B, it can be seen that microbubbles are remarkably increased.

The foregoing detailed description is illustrative of the present invention. In addition, the foregoing is intended to illustrate and explain the preferred embodiments of the present invention, and the present invention may be used in various other combinations, modifications, and environments. That is, it is possible to make changes or modifications within the scope of the concept of the invention disclosed in this specification, within the scope of the disclosure, and / or within the skill and knowledge of the art. The above-described embodiments illustrate the best mode for carrying out the technical idea of the present invention, and various modifications required for specific application fields and uses of the present invention are also possible. Accordingly, the detailed description of the invention is not intended to limit the invention to the disclosed embodiments. In addition, the appended claims should be construed to include other embodiments.

10: High Efficiency Micro-bubble generator and Flotation Separator using the same
100: Mixing tank
I1: first inner space
200: Micro bubble generator
210: motor
220: First Edition
230:
240: Impeller section
241: top plate
242: Lower plate
243: impeller blade
243a:
244: first inflow hole
250: Second Edition
251: hole
260: inlet pipe
261: First medicine storage tank
262: first valve
263: Quantitative pump
300: Flotation tank
I2: second inner space
310: Baffle
320:
330: scraper portion
331: Body
332: scraper
333: Support member
400: connector
410: second medicine storage tank
420: injection tube
430: second valve
200: Micro bubble generator
210 ': motor
211 ': Motor through hole
220 ': First Edition
230 ': rotating shaft
231 ': rotating shaft hole
240 ': impeller portion
241 ': top plate
241a ': a second inflow hole
242 ': lower plate
243 ': impeller blade
243a ': bending section
244 ': Impeller through hole
250 ': Second Edition

Claims (13)

A motor 210 disposed inside the contaminated water;
A first plate 220 disposed at a lower end of the motor 210;
A rotation shaft 230 mounted on the motor 210 and passing through the first plate 220;
An impeller 240 mounted on the lower end of the rotary shaft 230 and rotating and having a first inlet hole 244 formed at the lower end thereof;
A second plate 250 disposed at the lower end of the impeller 240 and having a hole 251 formed at the center thereof; And
An inflow pipe 260 formed at one end thereof with the outflow hole 265 disposed to face the first inflow hole 244 through the hole 251;
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The impeller portion 240 may be formed,
An upper plate 241 connected to a lower portion of the rotation shaft 230;
A lower plate 242 spaced apart from the upper plate 241 by a predetermined distance and having a first inlet hole 244 formed at the center thereof; And
A plurality of impeller blades 243 provided between the upper plate 241 and the lower plate 242;
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The impeller blade 243 has a curved shape from the inside to the outside and a space S in which a negative pressure is generated is formed by the rotation of the impeller 240 inside the impeller 240 ,
Wherein a ratio of an area of the upper plate (241) of the impeller part (240) to an area of the first inlet hole (244) is 10% or more to 20% or less.
The method according to claim 1,
The other end of the inflow pipe 260 is branched into a plurality of pipes,
One of the other ends opens toward the atmosphere to introduce air into the inlet pipe 260 and the other end communicates with the first medicine storage tank 261 and flows into the inlet pipe 260 Wherein the first micro-bubble generator is configured to introduce the first medicine.
3. The method of claim 2,
Wherein a first valve (262) is formed at the other end of each of the inflow pipe (260) to open / close the other end of the inflow pipe (260).
The method of claim 3,
Wherein a metering pump (263) is provided in the first medicine storage tank (261) to adjust the amount of the first medicine to be introduced.
5. The method of claim 4,
Wherein the rotational frequency of the impeller blade (243) is 20 Hz to 60 Hz.
6. The method of claim 5,
The outflow hole 265
Is connected to the first inflow hole (244) so as to communicate with the space (S) inside the impeller part (240).
6. The method of claim 5,
The outflow hole (265)
The first inlet hole 244 is spaced apart from the first inlet hole 244 by a predetermined distance,
As the impeller 240 rotates, the contaminated water outside the impeller 240 and the air flowing out from the outflow hole 265 flow into the first inlet hole 244, and the impeller portion 240) to the inner space (S) of the high-efficiency micro-bubble generator.
A motor 210 'disposed in the atmosphere and having a motor through hole 211' formed therein in a vertical direction;
A first plate 220 'disposed at the lower end of the motor 210';
A rotating shaft 230 'mounted on the motor 210' and rotating and having a rotating shaft hole 231 'passing through the first plate 220' and communicating with the motor through hole 211 ';
An impeller 240 'mounted on the lower end of the rotary shaft 230' and rotating and having a second inlet hole 241a 'communicating with the rotary shaft hole 231'; And
And a second plate (250 ') having a downwardly inclined funnel shape and disposed at a lower end of the impeller portion (240'),
The motor through hole 211 ', the rotary shaft hole 231', and the second inlet hole 241a 'are coaxially positioned to form an inflow path L,
The impeller portion 240 '
An upper plate 241 'connected to a lower portion of the rotary shaft 230' and having the second inlet hole 241a 'formed at the center thereof;
A lower plate 242 'that is spaced apart from the upper plate 241' by a predetermined distance and disposed in parallel; And
And a plurality of impeller blades 243 'provided between the upper plate 241' and the lower plate 242 '
The impeller blade 243 'has a curved shape from the inside to the outside,
Wherein a ratio of an area of the upper plate (241 ') of the impeller portion (240') to an area of the second inlet hole (241a ') is 10% or more to 20% or less.
9. The method of claim 8,
And the rotational frequency of the impeller blade (243 ') is 20 Hz to 60 Hz.
A mixing tank 100 in which a first inner space I1 is formed and the polluted water introduced from the outside is stored in the first inner space I1;
The fine bubble generator (200) according to any one of claims 1 to 9, which is installed in the first inner space (I1) and generates fine bubbles in the contaminated water.
A floatation tank 300 in which a second internal space I2 is formed and the polluted water introduced from the first internal space I1 is stored in the second internal space I2; And
A connection pipe 400 installed so that the first inner space I1 of the mixing tank 100 and the second inner space I2 of the floating tank 300 are communicated with each other;
Wherein the high-efficiency micro-bubble generator includes a high-efficiency micro-bubble generator.
11. The method of claim 10,
The float bath (300)
A baffle 310 installed in the second inner space I2 to guide the minute bubbles combined with contaminants of the contaminated water flowing in the first inner space I1 to rise;
An angle adjuster 320 for adjusting the angle of the baffle 310; And
A scraper part 330 for removing floats floating on the polluted water stored in the second inner space I2;
Wherein the micro-bubble generating device is a micro-bubble generator.
11. The method of claim 10,
The connection pipe (400)
A second medicine storage tank 410 formed to inject the second medicine into the connection pipe 400;
An injection pipe 420 for connecting the connection pipe 400 and the second medicine storage tank 410; And
A second valve 430 for controlling an injection amount of the second medicine injected into the connection pipe 400;
Wherein the high-efficiency micro-bubble generating device comprises a high-efficiency micro-bubble generator.
(S100) in which the contaminated water introduced from the outside is stored in the first inner space I1 of the mixing chamber 100;
An upper plate 241 connected to a lower portion of a rotary shaft 220 connected to the motor 210 by operating the motor 210 of the fine bubble generator 200 installed in the first inner space I1, (S200) rotating the impeller part 240 including the lower plate 242 which is spaced apart from the first impeller 241 by a predetermined distance and formed with a first inlet hole 244 at the center thereof;
Generating a negative pressure in the space S by rotation of the impeller 240;
(S400) in which the air and the first medicine are sucked into the space (S) by the negative pressure;
The air and the first medicine are injected into the contaminated water by the centrifugal force generated by the rotation of the impeller portion 240 to mix the first medicine and the contaminated water while the air forms microbubbles S500);
The first drug reacts with contaminants in the contaminated water to generate micro floc (S600);
The micro flocs move in the direction of the connection pipe 400 according to the flow of the contaminated water and the micro flocs are flocculated by the polymer injected from the connection pipe 400 Creating a macro floc (S700);
A step S800 of moving the macro floc along the baffle 310 in the flotation tank 300 by buoyancy of the microbubbles; And
(S900) in which the macro floc which has risen to the surface of the floating tank 300 is collected and removed by the scraper 332;
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Wherein the ratio of the area of the upper plate (241) of the impeller part (240) to the area of the first inlet hole (244) is 10% or more to 20% or less. How it works.

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