KR102365005B1 - A Method For Water Purifying Using Ultrafine Bubble - Google Patents

Abstract

The present invention relates to a method for purifying water using ultrafine bubbles, which is a method for purifying water using a water purifying device which includes: a case having a motor installed therein and formed with a mixing portion in which a suction fan coupled to a motor shaft is installed on a side in which the motor shaft extends; a discharge pipe coupled to the case, through which air bubbles mixed with water is discharged into the water; and an air pipe coupled to the case and serves as a passage through which air is supplied to the mixing portion, wherein a discharge hole is formed in a side of the mixing portion, the discharge pipe is coupled to the case at a position in which the discharge hole is formed, and an air valve is installed on the air pipe to adjust an amount of supplied air, and the method includes: setting the water purifying device according to an area of an opening in the air pipe; and operating the water purifying device by driving the water purifying device to discharge the air bubble mixed with the water into the water through the discharge pipe. According to the present invention, it is possible to significantly reduce pollutants and algae.

Description

A Method For Water Purifying Using Ultrafine Bubble

The present invention relates to a water purification method, and to a water purification method using ultra-fine bubbles for purifying water by discharging air bubbles mixed with water into water.

In general, there are many cases where water does not flow properly in certain water areas such as swamps, lakes, ponds, and reservoirs, where water does not flow and is stagnant or slow flowing, such as rivers or streams. Water treatment to purify water is essential, and if water quality is not properly purified, problems such as algae or suspended matter are generated, causing a bad odor or disturbing the ecosystem.

Therefore, chemical water treatment such as spraying of algae and coagulant, adsorption of nutrients, etc., biological water treatment to absorb nutrients such as nitrogen fixation together with planting of aquatic plants at the point of entry of nutrients, or physical water treatment by suppressing the formation of a thermophilic layer Green algae in certain waters was prevented through physical water treatment that increases dissolved oxygen (DO) through forced circulation or aeration.

Registered Patent No. 10-1196945 uses microbubbles to maintain the surface temperature at a low temperature and to supply oxygen to the bottom layer of water while reducing algae, but the water quality purification effect that can be compared numerically has not been verified. There was a problem. In addition, there was a problem that a standard for securing a reliable water purification effect was not prepared even when the specifications of the motor were changed.

Republic of Korea Registration No. 10-1569450 Registration Patent Publication

The present invention has been proposed to solve the problems of the prior art as described above, and it purifies the water quality by discharging air bubbles mixed with water into the water to increase the amount of dissolved oxygen in the water, and it is possible to efficiently purify the water even if the operator changes. An object of the present invention is to provide a water purification method using air bubbles.

For the above purpose, the present invention provides a case in which a mixing part is formed in which a motor is installed therein and a suction fan coupled to the motor shaft is installed toward the extension of the motor shaft, and an air bubble coupled to the case and mixed with water. a discharge pipe discharged into the water, and an air pipe coupled to the case and serving as a passage through which air is supplied to the mixing unit, wherein the mixing unit has a side discharge hole and the discharge pipe is disposed in the case at a position where the discharge hole is formed A method of purifying water using a water purification device coupled to the air pipe and having an air valve for controlling the amount of supplied air;

A water purification device setting step according to the opening area of the air pipe, and an operating step of the water purification device in which the water purification device is driven and air bubbles mixed with water are discharged into the water through the discharge pipe A method of purifying water using a cloth is provided.

In the above, in the water purification device setting step, the water purification device is installed, the motor is operated, the opening of the air valve is adjusted, and the intake amount of air forming air bubbles mixed with water through the discharge pipe and discharged into the water is adjusted. characterized in that

In the above, in the water purification device setting step, the intake amount of air forming an air bubble that is mixed with water through the discharge pipe and discharged into the water is adjusted by reducing the opening area of the air valve, and the air mixed with water and discharged into the water It is characterized in that it is set to the opening area of the air valve in which the bubble does not rise to the water surface.

In the above, in the water purification device setting step, the intake amount of air forming an air bubble that is mixed with water through the discharge pipe and discharged into the water is adjusted by increasing the opening area of the air valve, and the air mixed with water and discharged into the water It is characterized in that it is set to the opening area of the air valve through which the bubble rises to the surface of the water.

In the above, in the water purification device setting step, the opening area of the air valve is adjusted, and the air bubble mixed with water through the discharge pipe and discharged into the water rises to the surface or does not rise to the surface. characterized in that

In the above, the operation step is characterized in that the water purification device is operated in the opening area of the air valve set in the water purification device setting step.

In the above, the operation step includes an installation step in which the water purification device is installed, and a resetting step in which the air valve opening area is reset to a discontinuous point while increasing or decreasing the opening area of the air valve set in the water purification device setting step. comprising; It is characterized in that it operates in the opening area of the reset air valve.

In the above, the auxiliary fan is further provided to extend forward of the suction fan and extend to the inside of the air pipe, and to rotate together with the motor shaft of the motor and the suction fan to generate a fluid flow to the rear inside the air pipe. do it with

In the above, the operation step is characterized in that the water purification device is operated in the opening area of the air valve set in the water purification device setting step.

In the above, the operation step includes an installation step in which the water purification device is installed, and a resetting step in which the air valve opening area is reset to a discontinuous point while increasing or decreasing the opening area of the air valve set in the water purification device setting step. comprising; It is characterized in that it operates in the opening area of the reset air valve.

According to the water purification method using ultra-fine bubbles according to the present invention, standards suitable for the water purification device used are provided, efficient water quality purification is possible even if the operator changes, suspended substances are removed and dissolved oxygen is dramatically increased, Substances that are pollutants such as phosphorus and nitrogen and algae are also significantly reduced.

1 is a schematic side view showing a water purification apparatus in which the water purification method using ultra-fine bubbles of the present invention is executed;
2 is a schematic side cross-sectional view illustrating the water purification device shown in FIG. 1;
Figure 3 is an experimental graph for explaining the setting step of the water purification device included in the water purification method using ultra-fine bubbles of the present invention,
4 and 5 are attached experimental photos to explain the setting step of the water purification device included in the water purification method using ultra-fine bubbles of the present invention.

All technical and scientific terms used in the description of the present invention, unless otherwise defined, have the meanings commonly understood by one of ordinary skill in the art to which this disclosure belongs. All terms used in the present disclosure are selected for the purpose of more clearly describing the present disclosure and not to limit the scope of the present disclosure.

As used in the description of the present invention, expressions such as "comprising", "including", "having" and the like imply the possibility of including other embodiments, unless otherwise stated in the phrase or sentence in which the expression is included. It should be understood in open-ended terms.

Expressions in the singular used in the description of the present invention may include the meaning of the plural unless otherwise indicated, and the same applies to expressions in the singular in the claims.

In the description of the present invention, when a component is referred to as being “connected” or “coupled” to another component, it means that the component can be directly connected or coupled to another component, or a new other component. It should be understood that the components may be connected or coupled through the medium.

In the water purification method using ultra-fine bubbles of the present invention, the set point should be interpreted as belonging to the scope of the present invention in the range including the setting tolerance.

Hereinafter, with reference to the accompanying drawings, it will be described in detail with respect to the water purification method using the ultra-fine bubbles of the present invention.

1 is a schematic side view showing an example of a water purification device in which the water purification method using ultra-fine bubbles of the present invention is executed, and FIG. 2 is a schematic side view illustrating the water purification device shown in FIG. It is a cross-sectional view, and FIG. 3 is an experimental graph for explaining the setting step of a water purification device included in the water purification method using ultra-fine bubbles of the present invention, and FIGS. 4 and 5 are water purification method using ultra-fine bubbles of the present invention It is an attached experimental photo to explain the setting step of the water purification device included in the .

In FIG. 2 , the direction from the motor 120 toward the installation member 115 is referred to as “front”, and the opposite direction is referred to as “rear”.

1 and 2 , the water purification device 100 includes a case 110 , a motor 120 , a suction fan 130 , a discharge pipe 150 , and an air pipe 140 . made including

The motor 120 is sealed inside the case 110, and the motor shaft 121 of the motor 120 protrudes toward the front. An openable and openable cover is provided at the rear of the case 110 , a handle is provided on the cover, and an electric wire 160 for supplying driving power to the motor 120 is connected.

The case 110 is provided with a mixing unit 110a in which the suction fan 130 coupled to the motor shaft 121 is installed toward the extending side of the motor shaft 121 . The mixing unit 110a has a hollow cylindrical shape that is opened forward, and a radially penetrating discharge hole 117 is formed on the side of the mixing unit 110a.

The case 110 includes a cover 113 provided on the front side of the mixing unit 110a and an installation member 115 provided on the front side of the cover 113 .

The cover 113 has a disk shape, and a hole through the front and rear is formed in the central portion. The size of the hole is formed larger than the diameter of the air tube 140 .

The installation member 115 has a cylindrical shape opened to the rear. A plurality of through-holes 115a are formed in the installation member 115 while being spaced apart along the circumferential direction and penetrated in the radial direction. The installation member 115 is provided in front of the cover 113 .

The motor shaft 121 of the motor 120 extends to the mixing unit 110a. The motor shaft 121 is rotatably supported by a bearing provided inside the case 110 , and a space between the motor shaft 121 and the inner diameter of the mixing unit 110a is sealed in front of the bearing. The end of the motor shaft 121 is located in the mixing unit 110a, and the suction fan 130 is provided at the end of the motor shaft 121 .

The suction fan 130 is integrally rotated with the motor shaft 121 of the motor 120 and is installed on the motor shaft 121 extending to the mixing unit 110a and rotatably installed in the mixing unit 110a. The suction fan 130 serves to generate a flow in the radial direction in the mixing unit 110a during rotation. The suction fan 130 is coupled to the motor shaft 121 so as to generate thrust in the radial direction of the mixing unit 110a, and includes a disc-shaped rotating plate and a plurality of rotating blades protruding forward of the rotating plate. It may consist of parts. The suction fan 130 is not limited to the above shape, and a structure for generating a fluid flow outward in the radial direction is possible.

The discharge pipe 150 is a hollow body which is connected to the discharge hole 117 formed on the side of the mixing unit 110a and is installed, and the air bubble mixed with water in the mixing unit 110a is formed in the discharge pipe 150 . ) through which it is discharged into the water. The discharge pipe 150 is connected to communicate with the discharge hole 117, extends in the radial direction of the mixing unit 110a, and is bent backward. The discharge pipe 150 may be located on the side of the case 110 , or may be located under the case 110 as shown by a dotted line in FIG. 1 .

The air tube 140 is coupled to the case 110 and serves as a passage through which air is supplied to the mixing unit 110a. The air tube 140 is coupled to the installation member 115 and is provided to penetrate from the front to the rear. One end of the air tube 140 extends to the mixing portion 110a and the other end thereof extends radially from the outside of the installation member 115 . The other end of the air tube 140 is exposed to the atmosphere during installation.

The air tube 140 may have a hollow inlet tab portion having a bent structure, and may have a structure in which a hollow tube body is connected to both sides of the inlet tap portion. When the air tube 140 is installed, one end of the air tube 140 located in the mixing unit 110a extends in the longitudinal direction to face the suction fan 130, and the other end extends in the radial direction to stand by from the water surface. exposed in the middle

One end of the air tube 140 may be positioned in front of the cover 113 adjacent to the hole of the cover 113 , or may penetrate the hole of the cover 113 and be positioned in the mixing unit 110a. .

An air valve 141 for controlling the amount of supplied air is installed in the air pipe 140 . The air introduced into the mixing unit 110a through the air tube 140 and the water introduced into the mixing unit 110a through a hole formed in the center of the cover 113 are mixed by the rotation of the suction fan 130 . It forms air bubbles and flows in the radial direction.

2 , the suction fan 130 may further include an auxiliary fan 131 protruding forward of the suction fan 130 to rotate integrally with the motor shaft 121 of the motor 120 . can

The auxiliary fan 131 extends forward of the suction fan 130 and extends to the inside of the air tube 140 , thereby rotating together with the motor shaft 121 and the suction fan 130 of the motor 120 to rotate the air tube. Generates flow in the fluid from the inside of 140 to the back.

The auxiliary fan 131 provides an additional suction power to the suction power generated by the rotation of the suction fan 130, so that the water filled in the air pipe 140 is smoothly discharged to the rear at the beginning of the start-up of the water purification device 100, especially make it possible

Hereinafter, a method of purifying water using ultra-fine bubbles generated from the water purification apparatus 100 will be described.

The water purification method using ultra-fine bubbles according to the present invention includes the steps of setting the water purification device according to the opening area of the air pipe 140 , and the water purification device 100 is driven and mixed with water through the discharge pipe 150 . It comprises a water purification device operating step in which air bubbles are discharged into the water.

In the setting step of the water purification device, the setting location and the installation location of the water purification device 100 may be different or the same.

When the setting place and the installation place of the water purification device 100 are different, the water purification device is installed in a water tank (hereinafter referred to as the setting place) installed indoors, etc., and after setting, a place to purify the water in the set state ( Lake, dam, etc.) can be moved to install and operate to purify water quality.

Since there is a difference in the installation environment, such as the difference between the water quality of the setting place and the water quality of the place (lake, dam, etc.) to purify the actual water quality, after installing it in the place (lake, dam, etc.) By adjusting the opening area of the valve 141, the water purification device is set again (reset). Since the set water purification device is reset, the change in the opening area of the air valve 141 may not be large.

When the setting place and the installation place of the water quality purifier 100 are the same, the water quality purifier is moved to a place for purifying water (lake, dam, etc.) and installed, and the opening area of the air valve 141 is adjusted to purify the water. You can purify the water quality by setting the device and operating it in the set state.

In the water purification device setting step, the water purification device 100 is installed at the setting or installation location, the motor 120 is operated, the opening of the air valve 141 is adjusted, and the air is adjusted according to the control of the air valve 141. The suction amount is controlled, and the air bubble mixed with water in the mixing unit 110a is discharged into the water through the discharge pipe 150 . The air bubbles discharged into the water vary according to the air intake amount according to the control of the air valve 141 .

In the setting step of the water purification device, the setting method of the water purification device 100 includes a method of decreasing the opening area of the air valve 141 and a method of increasing the opening area of the air valve 141 .

The method of reducing the opening area of the air valve 141 is with water while reducing the opening area of the air valve 141 in the state that the air valve 141 is opened as shown by the arrow A of FIG. When the discharged air bubble does not rise to the surface (strictly, when the air bubble discharged with water does not start to rise to the surface), the air valve 141 opening area (A1) is set by the air valve 141 becomes a point

The present inventor estimates that the size of the air bubble discharged at the set point becomes ultra-fine bubble (for example, 0.3 micron or less) to form an inflection point.

In FIG. 3, A1 is the air valve 141 opening area A1 when the air bubble starts not to rise to the surface while decreasing the opening area of the air valve 141 in the water purification device setting step, and the air bubble moves to the water surface. It is an inflection point that does not rise.

The water purification method using ultra-fine bubbles of the present invention includes the setting step of the water purification device as described above so that the opening area of the air valve 141 of the water purification device is operated with the inflection point A1 as the set point.

When the opening area is smaller than the set point, the amount of air flowing into the mixing unit 110a is also reduced, so the efficiency of water purification compared to the input driving the motor 120 is lowered, and when the opening area is larger than the set point, the mixing unit ( Although the amount of air introduced into 110a) increases, all or part of the air bubbles introduced into the water rise to the surface and are released back to the atmosphere, so the water purification efficiency is lowered.

The operation step of the water purification device includes an installation step in which the water purification device 100 is installed at an installation location, and an inflection point (A1) while increasing or decreasing the opening area of the air valve 141 set in the water purification device setting step. and a resetting step of resetting to the opening area of the air valve 141 corresponding to .

The resetting step is performed when the setting location and the installation location of the water purification apparatus 100 are different. In order to shorten the setting time of the water purification device 100 before installation in a place (eg, lake or dam) for water purification, the water purification device 100 is a water purification device set in advance in the setting step of the water purification device ( 100) is reset. The opening area of the air valve 141 to which the water purification device 100 is reset by finely adjusting the air valve 141 at the actual installation site by setting the water purification device 100 in advance through the water purification device setting step works in

According to the present inventor's water purification experiment, the slope of the first section of FIG. 3 is affected according to the degree of contamination of the water to be purified, and the opening area of the air valve 141 corresponding to the inflection point A1 is also changed.

The opening area of the air valve 141 at the inflection point A1 is affected by the area of the air pipe 140, the depth of the outlet of the discharge pipe 150, the output of the motor 120, the installation depth of the case 110, etc. is confirmed

[Experimental example]

The graph of FIG. 3 uses a motor of 5 horsepower, the discharge port diameter of the discharge pipe 150 is 75 mm, the diameter of the air pipe 140 is 15 mm, and the installation depth of the upper end of the case 110 shown in FIG. (H1) is 200 mm, the discharge pipe 150 is horizontally installed so that it is positioned to the side of the case 110, and the air valve 141 opening area in a state where the discharge hole depth (H) of the discharge pipe 150 is 450 mm It is the relationship with the time until the air bubble rises to the surface.

In the graph of FIG. 3, when the opening area of the air valve 141 is wider than the inflection point A1, the air bubble rises to the water surface as shown in FIG. 4, and the opening area of the air valve 141 is equal to or equal to the inflection point A1. When it becomes narrower than (A1), the air bubble does not rise to the surface as shown in FIG. 5 .

A case in which the water quality is purified by the water quality purification method using ultra-fine bubbles according to the present invention to which the water purification device 100 is applied will be described. In the water purification method using ultra-fine bubbles according to the present invention, it was confirmed that various pollutants are reduced compared to the conventional method, and it is maintained in a reduced state, while it is confirmed that the amount of oxygen contained in water also increases and is maintained in an increased state became

[Case 1]

The test case of Cheonan No.○ (1,500 tons of fresh water, 10 horsepower driving motor of the input water purification device, conducted at the inflection point (A1)) is shown in the table below. For comparison, the reduction rate was expressed as a percentage for various water quality items improved in the state before air bubble supply as in the present invention.

Measured water quality items TOC (mg/L) Chl-a T-N (mg/L) T-P (mg/L) Before implementation of the present invention 18.900 1021.500 2.630 0.403 After implementation of the present invention 9.800 178.400 0.750 0.096 Decrease rate (%) 48 83 71 76

The above experiment is the result of monitoring while jointly conducted with Cheonan City Hall, and on the 7th day after the implementation of the present invention, four items were measured and compared with the data before implementation of the present invention. As shown in the table above, when the water quality purification method using the ultrafine bubbles of the present invention is applied, it was confirmed that the water quality was improved in all items, not specific items.

[Case 2]

The test case of the Cheonan ○○ Park lake (10 horsepower driving motor of the input water purification device, conducted at the inflection point (A1)) is shown in the table below. For comparison, the reduction rate was expressed as a percentage for various water quality items improved in the state before air bubble supply as in the present invention.

Measured water quality items TOC (mg/L) Chl-a T-N (mg/L) T-P (mg/L) Before implementation of the present invention 9.000 418.300 2.595 0.891 After implementation of the present invention 4.300 116.400 1.219 0.100 Decrease rate (%) 52 72 53 88

The above experiment is also the result of monitoring while conducting jointly with Cheonan City Hall, and on the 7th day after the implementation of the present invention, four items were measured and compared with the data before implementation of the present invention. As shown in the table above, when the water quality purification method using the ultrafine bubbles of the present invention is applied, it is confirmed that the water quality is improved in all items, not specific items.

[Case 3]

The test case of Incheon ○○ Park lake (25,000 tons of fresh water, 20 horsepower driving motor of the input water purification device, conducted at the inflection point (A1)) is shown in the table below. For comparison, the reduction rate was expressed as a percentage for various water quality items improved in the state before air bubble supply as in the present invention.

(Sample measurement result at the first measurement point)

Measured water quality items COD (mg/L) SS (mg/L) T-N (mg/L) T-P (mg/L) Chl-a Before implementation of the present invention 22.9 48.0 6.43 0.183 119.5 After implementation of the present invention 14.6 10.0 2.28 0.033 15.9 Decrease rate (%) 36 79 65 82 87

(Sample measurement result at the second measurement point)

Measured water quality items COD (mg/L) SS (mg/L) T-N (mg/L) T-P (mg/L) Chl-a Before implementation of the present invention 23.4 46.0 6.41 0.185 117.4 After implementation of the present invention 12.6 8.4 2.27 0.035 15.9 decrease rate 46 82 65 81 86

The above experiment is the result of monitoring while jointly conducted with Incheon Facilities Corporation, and on the first day after the implementation of the present invention, five items were measured and compared with the data before implementation of the present invention in order to prepare for it. In order to confirm the improvement effect, samples were taken and measured at random two points far away from each other.

In the table above, TOC is Total Organic Carbon, TN is Total Nitrogen, TP is Total Phosphorus, SS is Suspended Matter, COD is Chemical Oxygen Demand, and Chl-a is Chlorophyll Chloride for Algae Determination It means the amount of refill-a.

According to the water purification method using ultrafine bubbles according to the present invention, it is confirmed that the reduction of various polluting substances is not improved, but the improvement of the specific polluting substances, and the oxygen content in water is also improved and maintained in an improved state.

100: water purification device
110: case 120: motor
130: suction fan 140: air pipe
150: discharge pipe 160: electric wire

Claims (10)

The case 110 in which the motor 120 is installed and the mixing part 110a in which the suction fan 130 coupled to the motor shaft 121 is installed toward the extending side of the motor shaft 121 is formed, the case ( A discharge pipe 150 coupled to 110 , through which air bubbles mixed with water are discharged into the water, and an air pipe 140 coupled to the case 110 and serving as a passage through which air is supplied to the mixing unit 110a. Including, a discharge hole 117 is formed laterally in the mixing unit 110a, and the discharge pipe 150 is coupled to the case 110 at a position where the discharge hole 117 is formed, and the air tube 140 ) as a method of purifying water quality using a water purification device 100 installed with an air valve 141 for controlling the amount of supplied air;
In the setting step of the water purification device according to the opening area of the air pipe 140 and the opening area of the air valve 141 set in the setting step of the water purification device, the water purification device is driven and water is passed through the discharge pipe 150 and a water purification device operating step in which air bubbles mixed with the water are discharged into the water;
In the water purification device setting step, the water purification device is installed, the motor 120 is operated, and the opening of the air valve 141 is adjusted to form an air bubble that is mixed with water through the discharge pipe 150 and discharged into the water. The amount of air intake is controlled;
In the water purification device setting step, the opening area of the air valve 141 is reduced to adjust the intake amount of air that forms an air bubble that is mixed with water through the discharge pipe 150 and discharged into the water, and is mixed with water and mixed with water. is set to the opening area of the air valve 141 in which the air bubble discharged to the surface does not rise to the surface;
The operation step of the water purification device includes an installation step in which the water purification device is installed at an installation location, and the opening area of the air valve 141 set in the setting step of the water purification device is adjusted so that the air bubble is mixed with water and discharged into the water. a resetting step of resetting the air valve 141 opening area not to rise to the water level; Water purification method using ultra-fine bubbles, characterized in that operated in the opening area of the reset air valve (141). delete delete delete delete delete delete According to claim 1, wherein the suction fan 130 is extended forward to extend to the inside of the air tube 140, and rotates together with the motor shaft 121 and the suction fan 130 of the motor 120, Water purification method using ultra-fine bubbles, characterized in that the auxiliary fan 131 for generating a fluid flow from the inside of the air tube 140 to the rear is further provided. delete delete

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