KR20080098839A - Apparatus and method for generating fine bubbles and controlling bubble sizes of surfactant using surfactant characteristics and pressed sprayng from conveyor pump - Google Patents

Abstract

An apparatus for generating fine bubbles of surfactant is provided to produce microbubbles or ultramicro bubbles, to control easily a size of the generated microbubbles according to purposes by producing the various microbubbles using one apparatus, to produce easily the microbubbles having a state that is suitable for a wastewater treatment, to cut down cost and to improve an efficiency of the wastewater treatment. A size of the bubble is diversified according to a purpose of use of treatments of foul water by using a pressure feed pump, transferring and jetting diluting agents(L) of the manufactured surfactant(S) into a dilution tank(1) on a grit of a bubbling chamber(4), forming a bubble group having a large size, transferring and jetting the formed bubble group at an interface of air and the diluting agents of the surfactant in the dilution tank again and controlling a size and a quantity of the generated bubble.

Description

Apparatus and method for generating fine bubbles and controlling bubble sizes of surfactant using surfactant characteristics and pressed sprayng from conveyor pump}

1 is a configuration diagram of a surfactant microbubble generating device as an embodiment of the present invention

2 is a block diagram of a device for generating a surfactant microbubble as another embodiment of the present invention

Figure 3 is a flowchart showing the operation principle of the surfactant micro-bubble generating device according to the present invention and the generation process for each bubble size

4 is a flowchart illustrating a process of generating 100 to 200 μm interface bubbles and 10 to 100 μm interface bubbles through a pump pressure injection of a surfactant microbubble generator according to the present invention.

Figure 5 is a graph showing the relationship between the bubble size and the pressure pump rotation speed generated by the present invention in one embodiment

<Key sign>

W: Influent S: Surfactant 1: Dilution Tank 2: Influent Supply Piping

3: Surfactant supply piping 4: Bubble generation chamber 5: Mixing stirrer L: Diluent

7: Level sensor 8: Opening level piping 9: Atmospheric opening piping

10: diluent transfer pressure pump 10 ': diluent inlet pipe 11: diluent pressure transfer pipe 12: bubble generating chamber connection pipe 13: pressure regulating manual valve 14: air suction ejector

15: fine bubble bypass piping 16: fine bubble discharge automatic control valve

17: Fine Photo Port Pipe 18: Discharge Flow Meter 41: Primary Pressure Injection Nozzle

42: bubble split grit 44: secondary pressure injection nozzle

The present invention utilizes a characteristic in which surfactant molecules are molecularly oriented between hydrophobic and hydrophilic properties between different phases (liquid / gas / solid), and thus the microparticles of bubble-shaped micro-units in which a surfactant molecule wraps in a gas phase are produced. The present invention relates to a device and a method capable of generating bubbles of an appropriate size according to a purpose by incorporating a gas having a volume of 30 to 50% per unit bubble generation liquid and adjusting the bubble size.

More specifically, in the present invention, the prepared surfactant diluent contained in the dilution tank is transferred to the grit of the bubble generating chamber by a pressure transfer pump to form a large bubble group, and the formed bubble group is again interfaced with the dilution tank. By transporting and spraying the activator diluent and the air interface, it is possible to control the size and quantity of the generated bubbles and to generate the multi-volume surfactant ultra-fine foam that can be used by changing the size of the bubble in accordance with the purpose of treating various wastewater. It relates to an apparatus and a method.

The present invention will be described in more detail by using a dilution tank containing a diluent of the influent and the surfactant, and diluting the surfactant stock solution with water to dilute the surfactant dilution water through a pressure pump. The first injection by transferring to the generating chamber can generate and obtain a large group of interfacial bubbles.

In addition, for example, the bubble group of 100-200 µm interfacial bubbles having a bubble size divided by the horizontal and vertical average diameters of the bubbles have high concentrations of sewage sludge (surplus sludge, fresh sludge or mixed sludge) and high-concentration industrial wastewater without pretreatment. And since it is suitable to be applied to a large solid formed in the flocculation solidification process, such as sewage, it is convenient to the 100 ~ 200㎛ interfacial bubble group to be taken out to use. In addition, the post-treatment and associated treatment such as industrial wastewater and livestock wastewater, which have a small size and have a large amount of pin flocs, are not produced at high concentrations and have a large amount of pin flocs. It can be used by generating a step of 10 ~ 100㎛ microbubble by secondary pressure injection to the stored dilution and air interface by addressing the inside. In this way, if the feed pressure of the transfer pressure pump and the grit-equipped bubble generation chamber and the liquid / surface of the dilution tank are applied stepwise, the fine particles of the surfactant are generated in the same volume to be suitable for the purpose of the various wastewater treatment. It is possible to control the buoyancy of the bubble during the separation process by the buoyancy of the bubble.

Therefore, in the wastewater treatment facility consisting of several processes, when the flotation method used in the high concentration sludge concentration of live sewage treatment plant or livestock and post-treatment of industrial wastewater is applied, the bubble generating apparatus is selected according to the present invention so as to be suitable for the characteristics of the wastewater. By increasing the efficiency of solid-liquid separation through proper use, it is possible to create and provide a surfactant ultra-fine foam using only the characteristics of the surfactant and the pumping pressure of the pump without using complicated bubble generating equipment such as a separate pressurization facility and a compressor. have.

In general, the microbubble generating device used for solid matter separation method of sewage water using microbubbles is a device that determines the facility efficiency and direct performance of the flotation method, which is an intermediate treatment process, as one unit operation of the sewage water treatment process. .

The device using the flotation method of sewage water treatment is installed at the rear stage during sewage sludge concentration or industrial wastewater pretreatment load reduction and livestock wastewater treatment which is one independent process, and it is used in combination with both sewage treatment plants and related processes. Sometimes. In any case, it is advisable to select the main bubble generation method of the flotation method in order to reach the target treatment efficiency in the wastewater treatment process.

Conventional bubble generator is a device that generates bubbles by dissolving air in the treated return water by using a pressurized facility to supply air to the compressor and a high pressure of 4 ~ 6kg / ㎠ in the pressure tank as a low concentration during the wastewater treatment process It has been used for microparticle injury. However, the high concentration of sludge, etc., had a negligible effect because the amount of gas volume contained in the unit bubble liquid was small. In addition, since the bubbles are dissolved in the air to use the micro bubbles generated during the decompression to induce air turbulence in the nozzle during ejection, the volume of the treatment tank inevitably must be increased due to the small gas volume of the unit bubbles There was a problem. In addition, the present invention is a method and device for generating a surfactant micro-bubble used in the separation of solids of wastewater and sewage water at atmospheric pressure, the invention and method of the invention "Waste water treatment method and apparatus using a micro-foam (Invention Patent 0163659)" and Further improvement of the "Method and apparatus for generating ultra-miniature bubbles formed by the double film (Invention Patent No. 0338759)" to maximize the size of the ultra-mini-foam and the volume of gas contained per volume of the bubble generating liquid, It relates to a technique belonging to the bubble generating device and method of atmospheric pressure buoyancy method using a surfactant that can control the.

Therefore, the present invention solves the above problems by using only the molecular orientation characteristics of the surfactant and the transport injection of the transfer pressure pump without using a separate auxiliary device such as a pressurization facility, a compressor, a nozzle, etc. It is an object of the present invention to provide a method and apparatus for efficiently controlling microbubbles that serve as mediation of solid-liquid separation and easily adjusting the size of the generated microbubbles according to the purpose of wastewater treatment. In other words, in the bubble liquid generated to facilitate the treatment of various wastewater, the content of gas to the volume of the bubble liquid is 30-40%, so that microbubbles in a state suitable for the wastewater treatment target material can be easily generated. It is an object of the present invention to provide a method and apparatus for generating multi-volume microbubbles using one surfactant.

In order to achieve the above object, the present invention uses the characteristics of the molecular orientation between the hydrophobic and hydrophilic interfacial surface of the surfactant, the diluent of the surfactant at the pumping pressure of the pump at each bubble / gas interface of the bubble generating chamber and the dilution tank By spraying step by step, the gas is embedded in the interfacial molecule so as to form a multi-volume ultra-fine bubble containing a maximum gas per unit bubble liquid. Specifically, dilution water is pumped using a pump pressure of the pump. Through the first injection by transporting to the bubble generating chamber installed with the conveying pipe and the elongated grit through the air through the first to create an interface bubble mainly for 100 ~ 200㎛ interface bubble, and also to surround the outside of the generated bubble liquid Secondary pressure injection is mainly performed by secondary pressure injection to the dilution liquid and air interface stored in the open dilution tank. It is characterized by the ability to selectively generate ultra-miniature bubbles according to the purpose through the apparatus and method capable of generating a microbubble.

Hereinafter, the configuration of the present invention with reference to the accompanying drawings in detail as follows.

1 is a block diagram of a surfactant microbubble generating device as an embodiment of the present invention.

FIG. 2 is a block diagram of a surfactant microbubble generating device when the bubble generating chamber 4 shown in FIG. 1 is used separately from the outside of the dilution tank 1.

Surfactant microbubble generating device that can control the size of the bubble by using the characteristics of the surfactant (S) and the pressure injection of the transfer pump according to the present invention, the surfactant and the influent feed device mixing stirrer (5) is largely provided The dilution tank 1 is provided, and the bubble generating chamber 4 configured to spray-discharge the dilution liquid L to the interface of the dilution liquid L which is impregnated in the dilution tank 1 and the pump piping device connected thereto.

The dilution tank (1) is connected to the inlet water supply pipe (2) and the surfactant supply pipe (3) provided with an inlet automatic control valve (21).

The dilution tank (1) is provided with a level sensor (7) capable of detecting the level of the diluent (L) as shown in FIG.

The lower portion of the dilution tank (1) is provided with a diluent inlet pipe (10 '), the diluent inlet pipe (10') is connected to the diluent transfer pressure pump (10). The diluent transfer pressure pump 10 is provided with a diluent pressure transfer pipe 11, and the diluent pressure transfer pipe 11 is a bubble generating chamber connecting pipe 12, a micro bubble bypass pipe 15, and a fine bubble discharge. It is configured to communicate with the pipe (17).

The bubble generating chamber connection pipe 12 is connected to the upper portion of the bubble generating chamber 4 installed in the dilution tank 1, the micro-bubble bypass pipe 15 is connected to the lower portion of the dilution tank (1). do. In addition, the microbubble discharge pipe 17 is connected to a wastewater treatment tank or the like in which wastewater is contained.

The bubble generating chamber connecting pipe 12 is provided with an air self-suction ejector 14 and a pressure regulating manual valve 13 for sucking air as needed, and the micro bubble discharge pipe 17 has a micro bubble discharge automatic. The control valve 16 and the discharge flowmeter 18 are provided. In addition, the microbubble discharge pipe 10 and the microbubble bypass pipe 15 are further provided with an on-off valve.

The bubble generating chamber (4) is composed of a sealed container in which the inlet pipe and the discharge pipe are extended, and in the sealed container there is a primary pressure spray nozzle (41) connected to the bubble generating chamber connecting pipe (12), and A bubble splitting grit 42 in which the dilution liquid L injected through the primary pressure injection nozzle 41 collides is mounted therein. In order to further increase the amount of bubbles, a plurality of bubble split grit may be additionally installed as necessary. Further, there is also provided a secondary pressure injection nozzle 44 through which the dilution liquid L passing through the bubble splitting grit 42 is injected. Here, the dilution liquid L injected through the secondary pressure injection nozzle 44 is pressure sprayed to collide with each other at the interface of the dilution liquid L stored in the dilution tank 1 to generate microbubbles.

The bubble groups having different sizes generated in the above processes can be used by addressing the discharge pipe from the bubble generating chamber 4 to the outside, and the size of the bubble group is reduced by speaking inside the dilution tank 1 as shown in FIG. Can be used.

Referring to the action of the surfactant micro-bubble generating device that can control the size of the bubble by using the characteristics of the surfactant (S) and the pressure injection of the transfer pump configured as described above are as follows.

Inflow water (W) and the surfactant (S) is introduced into the dilution tank (1) from the inflow water supply pipe (2) and the surfactant supply pipe (3). At this time, the injection amount of the inflow water (W) is controlled by the inflow automatic control valve 21 provided in the inflow water supply pipe (2), and also the inflow water that is diluted in the dilution tank (1) and diluted by the mixing stirrer (5) The water level of the dilution liquid (L) composed of (W) and the surfactant (S) is controlled by the level sensor 7 provided in the dilution tank (1).

The diluent L of the dilution tank 1 is introduced into the diluent inlet pipe 10 ′ by the diluent transfer pressure pump 10 and then transferred to the diluent pressure transfer pipe 11. Next, the diluent pressure transfer pipe 11 is introduced into the bubble generating chamber connecting pipe 12 and introduced into the bubble generating chamber 4 (in this case, the micro bubble discharge pipe 17 and the fine bubble bypass pipe 15 are provided. ) Is closed)

As described above, the diluent L injected into the bubble generating chamber 4 is first injected through the pressure spray nozzle 41 of the bubble generating chamber 4 to collide with the bubble splitting grit 42. Of course, in order to further increase the number of bubbles, a larger amount of finer from the dilution liquid L by re-impacting the dilution liquid L having passed through the first bubble dividing grit 42 to the second bubble dividing grit 43. You can also create an artillery.

As described above, the bubble liquid B in which a bubble group mainly having a size of approximately 100 to 200 μm is generated is diluted in the dilution tank 1 through the secondary pressure injection nozzle 44 of the bubble generating chamber 4. Injection into the interface of (L) causes liquid collision by pressure injection to the dilution liquid (L) stored in the dilution tank (1), and the surfactant (S) molecules are oriented to the outside and gas is contained in the normal 100 Ultra-micron cloth of less than or equal to μm can be produced.

As described above, the dilution liquid L stored in the dilution tank 1 is transferred to the bubble generating chamber 4 through the dilution liquid conveying pressure pump 10, and the bubble liquid injected through the bubble generating chamber 4 is provided. (B) is injected into the diluent (L) through the diluent (L) is generated ultra-ultra-foam bubble again through the diluent pressure transfer pipe 11 and the bubble generating chamber connecting pipe 12 by the diluent transfer pressure pump 10 Continuously circulating the process of re-transmission to the bubble generating chamber (4) in the diluent (L) low in the dilution tank (1) is further increased ultra-ultra-foam of 100㎛ or less to generate a large amount of ultra-micro-foam.

Then, when the microbubble discharge pipe 17 is opened, the dilution liquid L from which the ultra-fine bubbles are generated is discharged to the outside through the microbubble discharge pipe 17, and as the discharge proceeds, the dilution tank 1 The level sensor (7) detects the degree to which the level of the dilution liquid (L) lowered in the low level, thereby opening the influent automatic control valve (21) provided in the influent water supply pipe (2) by the required amount ( W) is supplied to the dilution tank (1).

In addition, the amount of fine bubbles discharged through the fine bubble discharge pipe 17 can be controlled to discharge through the fine bubble discharge automatic control valve 16 provided in the fine bubble discharge pipe 17, if necessary Through the bubble bypass pipe 15, the microbubbles may be re-injected into the dilution tank 1.

On the other hand, the microbubbles generated from the bubble generating chamber 4 may be taken out to the outside, for example, when the bubbles form a large group of interfacial bubbles having a size of more than 100 µm. In order to obtain bubbles having a bubble size exceeding 100 μm in the bubble generating chamber 4, the secondary pressure spray nozzle is not used or operated, and the bubble generating chamber and its connecting piping are not shown in FIG. Likewise, it is convenient to separate out the dilution tank to generate a bubble mainly made of the 100 ~ 200㎛ size. As shown in FIG. 2, the bubble generation chamber 4 is separated from the dilution tank 1, and then the microbubble discharge pipe 17 is directly connected to the secondary pressure injection nozzle 44 of the bubble generation chamber 4. In this case, the microbubbles generated through the bubble generating chamber 4 are not converted into ultra-fine bubbles which are further refined by colliding with the diluent L of the dilution tank 1, and the microbubble discharge pipe 17 having the above-described size It will be discharged through.

This relatively large microbubble is suitable for the properties of sewage sludge (surplus sludge, fresh sludge or mixed sludge) with high concentrations of solids and high concentrations of industrial wastewater and sewage that have not been pretreated, and have a high concentration of solids. It can be used separately for industrial wastewater, livestock wastewater, etc. In this case, microbubbles having a larger bubble size are more effective for floating separation than ultra-miniature bubbles. Of course, it is sometimes effective to use bubbles having various bubble sizes.

The size of the bubble described above can be controlled by the rotational speed of the transfer pressure pump or the diluent transfer pressure. In this case, since the diluent conveying pressure is approximately proportional to the rotational speed of the conveying pressure pump, and the pump rotational speed control is more precise and easier in operation, the size control of the bubble is made to be the rotational speed of the conveying pressure pump. It is characteristic.

Example

According to the apparatus of FIGS. 1 and 2 and the process of FIGS. 3 and 4 according to the present invention, the bubbles are generated, and the diluent transfer pressure pump containing the bubbles is various as shown in <Table 1> and <Table 2>. The bubble size change was observed by varying the rotation speed.

<Table 1> and <Table 2> below shows the size change of the micro bubbles and ultra-miniature bubbles according to the rotational speed and the discharge pressure of the diluent transfer pressure pump (10). 5 is a graph showing the size change of the micro-bubbles and ultra-miniature bubbles again according to the rotation speed of the diluent transfer pressure pump on the basis of the numerical values shown in <Table 1> and <Table 2>.

TABLE 1

TABLE 2

As shown in the table, it can be seen that the size of the microbubble and the ultra-small strength bubble is approximately inversely proportional to the rotational speed of the transfer pressure pump 10 of the diluent (L). That is, as shown in Table 1, when the rotation speed of the diluent transfer pressure pump 10 is 550 RPM (0.3 kg / cm 2), the microbubble size is 190 to 210 μm, and the rotation speed of the diluent transfer pressure pump 10 is 1750 RPM. Since the size of the microbubbles when increased to (1.5kg / ㎠) is 70 ~ 100㎛ it can be seen that the size of the microbubbles decreases as the number of revolutions of the diluent transfer pressure pump 10 increases.

In addition, as shown in Table 2, when the rotation speed of the diluent conveying pressure pump is 550 RPM (0.3 kg / cm 2), the ultra-small fabric size is 40 to 60 μm, and the rotation speed of the diluent conveying pressure pump is 1750 RPM (1.5 kg). / Cm 2), the size of the ultra-micro bubbles is 5 ~ 9㎛, so the micro bubbles can be seen that the size becomes smaller as the number of revolutions of the diluent (L) transfer pressure pump increases as the microbubbles. .

The above-mentioned relationship of Table 1 and Table 2 is shown in FIG. As can be seen here, it can be seen that the bubble size produced is approximately inversely proportional to the rotation of the pressure pump. Therefore, it can be seen that the size of the microbubbles can also be controlled by the rotation speed of the pressure pump.

According to the present invention as described above, it is possible to selectively generate microbubbles or ultra-miniature bubbles, and also to easily control the size of the generated microbubbles according to the purpose to create a variety of microbubbles in one device As a result, it is possible to easily generate microbubbles in a state suitable for the target material for wastewater treatment, thereby achieving various effects such as cost reduction and improving wastewater treatment efficiency.

Claims (4)

To generate bubbles surrounding the gas phase by surfactant molecules, and to adjust the bubble size to generate bubbles of appropriate size according to the application purpose Surfactant diluent mixed with dilution of the influent and the surfactant is transferred to the grit of the bubble generating chamber with a pressure transfer pump to generate a large bubble group of 100 µm to 200 µm in size. In order to generate the bubble size of the generated bubble group into the ultra-fine foam of 10 ~ 100㎛ size again transfer spraying at the interface between the diluent of the dilution tank and the air, it is repeatedly circulated to generate bubbles. Method of producing a microbubble of the surfactant, characterized in that the ultra-high strength bubbles of the size can be generated by controlling the size and quantity of bubbles generated at the time of the pump rotation speed of the pressure transfer pump. A surfactant dilution tank diluted with influent with a mixing stirrer to be mixed by the surfactant supply pipe, the influent water supply pipe, and stirring; A bubble generating chamber for injecting and diluting the diluent at the interface between the dilution liquid and the air that are poor in the dilution tank; It consists of a pressure transfer pump having a pressure transfer pump which can also control the bubble size by the rotation speed control and pipes connected thereto, The dilution tank 1 is installed with a level sensor that can detect the level of the diluent, The bubble generating chamber is composed of an airtight container in which an inlet pipe and a discharge pipe are opened, and in the airtight container, a primary pressure spray nozzle connected to the bubble generating chamber connecting pipe, and injected through the first pressure spray nozzle Bubble dividing grit in which the diluent collides with the secondary pressure spray nozzle for pressure spraying the diluent passed through the bubble dividing grit. The pipe of the pressure transfer device is a surfactant micro-bubble generating device, characterized in that consisting of the bubble generating chamber connection pipe of the bubble conveyed through the diluent transfer pressure pump and the micro bubble bypass pipe and the micro bubble discharge pipe of the connection pipe. . The dilution tank according to claim 2, wherein the bubble generating chamber does not use the secondary pressure injection nozzle when the bubble generating chamber has a bubble size exceeding 100 µm, and the bubble generating chamber and its connecting pipe are separated. Surfactant micro-bubble generating device, characterized in that separated from the outside to generate the bubbles. 3. The surfactant microbubble generating device according to claim 2, wherein the bubble generating chamber connecting pipe has an air-suction ejector and a pressure regulating manual valve.

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