KR20120080828A - Method of removing green and red tides in water by using nano-bubbler - Google Patents

Abstract

PURPOSE: A method for eliminating red algae and green algae using a nano-bubble generator is provided to improve the ecological environment of aerobic microorganisms and aquatic organisms by increasing dissolved oxygen in water. CONSTITUTION: A method for eliminating red algae and green algae using a nano-bubble generator includes the following: the nano-bubble generator is submerged in water; air or oxygen gas is supplied from an external gas supplying part into the bubble generator at a pressure more than or equal to atmospheric pressure; the air or the oxygen gas passes through a bamboo filtering member to become nano-bubbles in the water; and the nano-bubbles eliminate the red algae or the green algae. The nano-bubbles increase dissolved oxygen in the water. A plurality of nano-bubble generators is integrated to form a bubble assembly.

Description

Method of Removing Green and Red Tides in Water by Using Nano-bubbler}

The present invention relates to a method for removing green algae and red algae in water, and more particularly, to kill green algae and red algae in water using nanobubbles, and to further increase the concentration of dissolved oxygen in water to aerobic microorganisms. To improve the ecological environment of aquatic plants, fish, water fleas, etc., and to help them to multiply and feed them into eutrophic elements, green algae and red algae, to remove green algae and green algae. .

Today, water resources are an important part of the environmental elements that people need to live. The impact of water resources on the general public is enormous. Such efficient securing and distribution of water resources is of high value not only as a function of national infrastructure, but also as an indicator of the pleasant life of the people, and in terms of securing high quality agricultural and industrial water.

In the summer when the temperature of the water temperature rises in such water resources, green algae or red tide are generated even in reservoirs, lakes, fisheries, offshore seas or flowing waters, which is a problem. They kill not only fish in a lake or aquaculture, but also aquatic plants, destroying the ecological environment and causing severe odors.

In general, algal blooms are caused by the proliferation of floating algae (phytoplankton) in the eutrophic lakes or slow-flow streams that accumulate on the surface of the water and change the color of the water to significantly green. The cause of the green algae is known to adversely affect aquatic plants by the algae that causes toxins. For example, it causes serious problems such as the effects of toxins on humans and livestock, ecological problems due to the destruction of ecosystems, and the death of fish and various aquatic organisms due to oxygen deficiency.

On the other hand, the red tide phenomenon refers to a phenomenon in which the phytoplankton grows in a large amount and the color of the sea water turns red. When the red algae are mostly flagella algae or diatoms, they are caused by ciliforms classified as euglena or protozoa. The red tide phenomenon has been widely found in South Korea coast, west sea, and south east coast in recent years, and the red tide is also shifting from the center of diatoms to the flagella algae, and the concentration of red tide is becoming more dense. This is a trend that is increasing the damage of red tide year by year.

As such, recent green algae or red tide phenomena are frequently generated due to wide area, toxication, and prolonged phenomena, and thus, there is an urgent need for technology development to remedy them.

Existing techniques for solving this phenomenon include a method using human labor, a chemical sterilization method using chlorine-based chemicals or ozone, a method of adsorbing green algae or red algae with electrostatic adsorption force using yellow soil, etc. In addition, the filtration method of sucking green algae or red tide and separating green algae and red algae from water with a fine filter and removing algae using other organisms or microorganisms is common.

The direct method of using human labor force is a temporary measure that consumes only the labor force and is not an effective way to solve large areas, frequent green algae or red tide phenomena.

Chemical sterilization method using chlorine-based chemicals or ozone should be considered carefully because it is difficult to use because it is harmful to human body and harmful to crops when used for drinking water and agricultural water, and also affects recreational activities such as swimming pool. In addition, incorrect use of chemicals may adversely affect the natural ecological environment, which may cause worsening of water quality.

Agglomeration sedimentation method using ocher is a method of removing green algae or red algae by adsorbing and flocculating suspended solids (nutrients, fine plankton, etc.) in water through colloidal particles of ocher. However, this approach removes some of the green algae and red algae by mass spraying, but requires more dissolved oxygen to break down red algae that have been flocculated by ocher and settled under water. Increasing oxygen in the water can lead to accelerated eutrophication, eventually leading to the formation of dead lakes or seas that no longer need aquatic plants or microbes that require oxygen.

Filtration of green algae and red algae using a filter is a physical method of separating water from green algae and red algae by pumping water contaminated by green algae and passing it through a filtration device including a filter. There is a disadvantage that it is difficult to use in the general way.

On the other hand, the recently introduced method of removing algae using living organisms or microorganisms has raised the possibility that the microbial species introduced to remove them may destroy or contaminate another ecological environment rather than the problem of algae or red tide. There is a drawback to the need for more seals in order to confirm the possibility.

In addition, recently, a method of removing green algae and red algae using silver nano has been introduced. This method uses sterilizing power of silver nanomaterials, which is difficult to be used by the general public, and its efficiency can still be objectively verified. There is no limit.

As such a conventional method, looking at the prior art introduced in the patent literature as follows.

Republic of Korea Patent No. 396314 "Water treatment method for supervision of green algae and red tide" (2003. 8. 19.); Republic of Korea Patent No. 420253 "Green algae and red algae remover having an effect of increasing dissolved oxygen, nutrient source removal and quality improvement, and the method of removing green algae and red tide using the same" (2004. 2. 13.); Republic of Korea Patent No. 429781 "Green algae removal method using natural enemies" (2004. 4. 20.); Republic of Korea Patent No. 528104 "Water Purification Method Using Microbubble Ozone" (2005. 11. 4.) Republic of Korea Patent No. 569820 "A method for purifying lake water and removing algae" (2006. 4. 4.); Republic of Korea Registered Patent No. 819460 "Ocher-carpox fiber composite and its preparation method for removing green algae or red tide" (2008. 3. 28.) Republic of Korea Patent No. 960227 "Inhibition method and algae inhibitor of algae using silver nano" (2010. 5. 19.)

The present invention is to solve the above-mentioned problems of the prior art, and to remove the green algae and red algae contaminated in the water, harmless to the human body of the green algae and red algae that can supply abundant dissolved oxygen to aquatic organisms The purpose is to provide a removal method.

In order to achieve the above object, the present invention is to provide a bubble generator for generating a nanobubble in water, and to supply air or oxygen gas to the inside of the bubble generator through a connection portion at a pressure higher than atmospheric pressure from an external gas supply unit. Afterwards, the air or oxygen gas is passed through the bamboo filter member of the bubble generator to be converted into nanobubbles in water, and the nanobubbles remove green algae or red algae from the water. Provides a method for removing algae.

In the present invention, the bubble generator is a connecting member coupled to the connecting portion of the gas supplied from the outside, the bamboo filter member to allow the gas inside to be converted into a nanobubble, and to fix the bamboo filter member It is preferable to include a fixing member.

When the green algae removal method according to the present invention is used, green algae or red algae are killed by the burst energy generated when nano-bubbles are ruptured in water sources such as lakes, river water sources, agricultural water sources, and fish farms such as the sea and fish farms. There is an advantage that can be removed efficiently.

In addition, the green algae removal method according to the present invention can not only efficiently remove green algae and red algae in water, but also increase the dissolved oxygen concentration in the water to activate aerobic metabolism of aquatic organisms, It also has the advantage of improving the ecological environment of aquatic plants, fish and daphnia.

In addition, when the green algae removal method according to the present invention is used, it is possible to prevent eutrophication of a lake river water source industrial water source or a large-scale water source, to restore the ecological environment of aquatic organisms, to create a natural food chain, and to improve natural purification ability. You can enjoy it.

In addition, when the removal method of the algae, etc. according to the present invention is used, chemicals, ocher powder, etc. are not left in the treated water, and thus there is an advantage that the concern of secondary pollution by these can be fundamentally solved. .

1 is a schematic cross-sectional view of the bamboo filter member used in the present invention,
2 is a schematic exploded perspective view of a bubble generator used in the present invention as a preferred embodiment,
3 is a schematic cross-sectional view of the bubble generator according to FIG.
4 is a photographic material showing the state before forming the bubble assembly by arranging five bubble generators side by side,
Figure 5 is a photographic material showing the experimental method of the present invention,
6 is a graph measuring the experimental results of the present invention,
7 is photographic data showing the first raw water and the treated water for performing the method of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the accompanying drawings are only intended to describe the technical spirit of the present invention in more detail, and the technical spirit of the present invention is not limited thereto.

The removal method of the algae according to the present invention proceeds in a state in which the bubble generator 100 generating nanobubbles in the water contaminated by the algae is deposited. The nanobubble generator 100 does not use a motor or use a high-speed rotating impeller as in the prior art, it is technical to use a bamboo filter member 110 processed by selecting from bamboo grown in natural conditions for over a year It is characteristic. Since the nanobubble phenomenon of the gas by the bubble generator 100 is related to the natural bamboo filter member 110, it will be described in this regard.

Figure 1 is a schematic cross-sectional view of the bamboo filter member 110 used in the present invention is a conceptual diagram for performing a method for generating a micro bubble in the water.

The present invention proceeds in a state in which the bamboo filter member 110 of the bamboo fiber layer in which the enamel layer is partially removed is deposited in water.

Filter bamboo used in the present invention is selected from the bamboo grown in natural conditions for one year or more. Bamboo, which has not passed one year in its natural state, is not preferable because the bamboo fiber layer 112 is not sufficiently matured, so the gas permeability is weak. In general, the bamboo has a different density of tissue of the bamboo fiber layer 112 according to the number of years to grow. In addition, when bamboo is cut at right angles to its longitudinal direction, the structure of the bamboo fiber layer 112 tends to be more dense from the center of the cylinder to the outside, the outermost layer of the outermost shell is thin and hard enamel layer ( 114). Although bamboo contains a small amount of moisture, it is preferable to dry it. When the bamboo is dried, the moisture is released from the bamboo fiber layer 112 to shrink, and the tissue becomes more dense. In case of excessive drying, the bamboo fiber layer is cut and the bamboo itself is split.

In the present invention, it is preferable that the bamboo removes all or part of the enamel layer 114 constituting the outer shell thereof. This is because the enamel layer 114 has a property of hindering the permeation of bubbles. Removal of the enamel layer 114 may be performed using a tool such as a blade or grinder. The manner of removing the enamel layer 114 is not particularly limited.

The present invention has a technical feature in that the bamboo fibrous layer 112 of bamboo is used as a filter material for gas to pass through. The bamboo fiber layer 112 forms a plurality of water pipes therein. Bamboo is believed to feed water from its roots, use it as a passage for moving water upward through a number of water pipes formed in the bamboo fibrous layer 112, and finally supply it to the leaves. At this time, the water pipe portion is formed in parallel in the longitudinal direction of the bamboo, is present in the bamboo fiber layer 112. However, in the present invention, gas does not penetrate through the water pipe part, but the gas is permeated through the fine gaps of the bamboo fiber layer 112. In FIG. 1, the arrow shows a state in which the gas passes through a fine gap of the bamboo fiber layer 112.

The present invention inserts air or oxygen gas into the inside of the bamboo fiber layer 112, and transmits the gas from the inside of the bamboo fiber layer 112 in the outward direction (that is, arrow direction in the drawing) To form fine bubbles; According to the experimental results, it was confirmed that the above fine bubbles are nano-level bubbles.

The present invention uses air or oxygen gas because it is not only efficient at removing green algae and red algae, but also can dissolve a large amount of oxygen in water thereafter. Although conventional prior arts generally use air or oxygen gas, a technique for minutely bubbled air or oxygen gas to nanobubble level in water has not been developed yet. In the case of forming fine bubbles at the level of nanobubbles with air or oxygen gas, as shown by the following experimental results, the results are very positive for the ecosystem. Because there is no. In order to increase the concentration of dissolved oxygen in water, it is necessary to increase the surface area of oxygen bubbles to increase the chance of gas / liquid contact. To this end, it is important to create a large number of bubbles per unit volume of oxygen in a short time and to increase the solubility by making bubbles as small as possible. In this case, the smaller the bubble size, the slower the rise rate, so that the residence time is increased, so that the solubility is increased. Therefore, the smaller the bubble size, the more the dissolved oxygen concentration can be improved.

Figure 2 is a schematic exploded perspective view of the case of using a cylindrical bamboo filter member as a preferred embodiment of the bubble generator 100 used in the present invention,

3 is a schematic cross-sectional view of the bubble generator 100 according to FIG.

The method according to the present invention proceeds using a bubble generator 100 to generate fine bubbles in water. Although the bubble generator 100 in the accompanying drawings illustrates a cylindrical bamboo filter member, it is only presented as a preferred means for explaining the method of the present invention, it is not limited to this shape.

In the present invention, the bubble generator 100 is a bamboo filter member 110 made of a bamboo material, the holding member 120 for supporting to maintain the bamboo filter member in a predetermined shape and to preserve the shape, and It includes a gas supply member 130 for injecting or supplying gas into the filter member 110 of the.

In the present invention, the bubble generator 100 includes a bamboo filter member 110 made of a bamboo material. Detailed description of the bamboo filter member 110 has already been made above, so a detailed description thereof will be omitted.

In the present invention, the fixing member 120 is composed of a fastening means such as a band on the outside of the bamboo filter member 110, or is composed of fixing means such as a clip on the inside and outside of the bamboo filter member 110. Can be. This is to prevent the bamboo filter member 110 from being ruptured or broken even when used at normal pressure or high pressure in water. The fixing member 120 is coupled to the front cap 122 and the rear side to be coupled to the front side of the bamboo filter member 110 and sealed when the bamboo filter member 110 has a cylindrical shape. And a rear cap 123 (see FIGS. 2 and 3). The front cap 122 and the rear cap 123 may tightly seal the bamboo filter member 110 by inserting a packing 125. The front cap 122 preferably includes a gas vent 124 through which the gas supplied from the gas supply member 130 can flow into the bamboo filter member 110. The front cap 122 and the rear cap 123 is preferably coupled to each other through a connecting rod 126 therebetween. To this end, the male screw formed on the other end of the connecting rod 126 and the female screw 127 formed on the rear cap 123 may be configured to be fastened to each other. In this case, there is no need to take external fastening means externally, there is an advantage that the appearance of the product is beautifully formed.

In the present invention, the gas supply member 130 may be used as a passage for introducing the gas supplied from the outside into the bamboo filter member 110. The gas supply member 130 may be coupled to the front cap 122 or the rear cap 123. The gas supply member 130 has an internal gas passage 131 through which external gas flows, a body portion 132 protecting the internal gas passage 131 and forming an external shape, and an external connection hose. It includes a coupling portion 134 that can be coupled with.

In the method of removing green algae according to the present invention, a plurality of the bubble generators 100 may be bundled to form one bubble assembly, and the bubble assembly may be used by depositing it in water. The bubble assembly is preferably formed by tying two or more bubble generators 100 or less. If more than 10 because it is more preferable to use two bubble assemblies than to form a bundle. In addition, if necessary, a plurality of bubble assemblies may be formed to use a plurality of bubble assemblies. 4 is a photographic material containing a state in which the five bubble generators 100 are arranged side by side to form one bubble assembly.

The removal method of the algae, etc. according to the present invention proceeds in a state in which the bubble generator 100 is immersed in water. This is because the microbubbles generated in the state in which the bubble generator 100 is immersed in water immediately melt into the water, and the algae and the like can be efficiently removed by the action of the microbubbles.

Removal method of the algae, etc. according to the present invention is to supply air or oxygen gas to the bubble generator 100 from the outside, which proceeds through the gas supply unit installed on the outside. The gas supply unit may use a conventional compressor, or a high pressure vessel or a high pressure oxygen cylinder containing a high pressure gas. The gas supplied from the gas supply part is most preferably air or oxygen. This is because the purpose of the present invention is not only to remove the algae, but also to improve the water quality and environmentally friendly water treatment thereafter. The nano bubbles of the air or oxygen gas increases the amount of dissolved oxygen in the water to dramatically improve the water quality.

Green algae removal method according to the present invention utilizes a connection hose for delivering air or oxygen from the gas supply to the bubble generator (100). The connection hose performs a function as a passage for moving the air or oxygen gas from the gas supply part into the bubble generator. Since the connection hose may be a conventional one, a detailed description thereof will be omitted.

The method of removing green algae and the like according to the present invention proceeds by using a bubble generator 100 that allows the internal gas to form fine bubbles when the internal gas is permeated to the outside. The technical feature of the present invention is to use the bubble generator 100, the nanobubble phenomenon of the gas by the bubble generator 100 is described in detail above for the internal structure and mechanism of the natural bamboo filter member 110 As described.

In the method of removing green algae according to the present invention, the nanobubbles formed through the bubble generator 100 are dissolved in water, and a part of the nanobubbles is removed during the process of rupturing the green algae. The remainder of the bubble is dissolved in water, increasing the dissolved oxygen.

The method according to the present invention removes green algae and the like and kills various harmful microorganisms in water as follows. The larger the size of the gas dissolved in the water, the faster the speed of floating on the water, and the more rapidly rising and breaking on the water surface to diffuse into the air, the amount of gas dissolved in the water is very weak. However, when bubbles are generated in the water from tens to hundreds of nanometers in size, nanobubbles can remain in water for up to several months, just as fine dust in air floats in the air for several months. While these nanobubbles remain in water, when contracted and ruptured in water under pressure, water at 40,000 Hz with local heat of about 5,500 ° C can be generated to sterilize pathogenic microorganisms and degrade harmful chemicals. Generate energy. Therefore, not only the green algae and the like on the water can be removed, but also various harmful microorganisms and pathogens in the water can be killed. In addition, as the micro-bubbles burst, the oxygen or air molecules contained therein are released into the water, thereby increasing the dissolved oxygen concentration in the water.

Example 1 Size of Microbubbles

After collecting biennial bamboo and drying it in a cool shade, remove the outer part with a grinder, and then made a cylindrical bamboo filter member 110 consisting of a cylindrical bamboo fibrous layer 112 of about 6 centimeters in diameter and about 21 centimeters in length. On the other side, the front cap 122 and the rear cap 123 on the opposite side thereof were coupled to the connecting rod 126. The inside of the front cap 122 and the rear cap 123 is sealed by inserting the packing 125 to be firmly sealed, the front cap 122 is supplied to the other side of the connecting rod 126 gas supply The member 130 was joined. Through this, the bubble generator 100 was completed. After that, prepare a transparent octagonal bucket with a height of 1.1 meters and a diameter of 55 centimeters, fill it with about 200 liters of water, and combine the bubble generator 100 with an air injection connection hose and put it in the bucket. The air injection hose was connected to an external high pressure oxygen tank. Open the high pressure oxygen tank from the outside to supply oxygen gas at a pressure of about 4bar for about 2 hours. Figure 5 shows the experimental method as a photograph.

In order to confirm the size of the oxygen bubbles generated by Example 1, the size and number of oxygen bubbles in the water was measured. As the measurement method, the water obtained in Example 1 was maintained for about 48 hours, and then used LM10-HS model manufactured by NanoSight Ltd of England. As a result, the average diameter of the microbubbles was 81 nm, the average size of the most bubbles was 62 nm, SD was 35 nm, D ₁₀ was 49 nm, D ₅₀ was 70 nm, and D ₉₀ was 135 nm. The number was confirmed to be 7.93 X 10 ⁸ . These experimental results were accepted as obtaining nano-bubbles that could hardly be obtained by the conventional method, which were unpredictable at all. 6 clearly demonstrates these experimental results.

Example 2 Removal of Green Algae in Reservoir

In order to confirm whether the microbubble generation method of the liquid according to the present invention can be applied to actual aquatic crops and the like, the algae removal performance was tested.

The experiment was conducted at Bulgap Reservoir in Noksan-ri, Bulgap-myeon, Yeongggun-gun, Jeonnam. The reservoir has a water depth of about 4 meters and an external temperature of about 30 ° C. The green algae of the reservoir were observed to form a very thick layer on the surface of the water, about 5 mm thick. Five cylindrical bubble generators 100 according to Example 1 were bundled to form one bubble assembly, which was installed at the bottom of the reservoir. The air was supplied from a high pressure air tank at an external pressure of about 4-5 bar.

As a result of visual observation, after the experiment was started, it was observed that the dark green color gradually faded around the cylindrical microbubble generator, and the area where the color faded was expanded over time. went. After about 2 hours, the green algae can no longer be observed by the naked eye centering on the bubble-producing site.

Fig. 7 is photographic data of the first raw water (right side) of the above mentioned reservoir and the treated water (left) after treatment by the method of the present invention. As can be seen from the photographic data, the raw water on the right side is very turbid, and there is green algae in the upper layer, but the treated water on the left side is relatively clear and no green alga can be found.

In addition, after the first raw water and the treated water according to the present invention were allowed to pass for about three months at room temperature, water quality analysis thereof was performed.

Water quality analysis was conducted by Dasan Life Science Co., Ltd., located in Hwasun-gun, Jeonnam, to verify objectivity. The result of analyzing the first raw water is shown in Table 1 below.

Also, in order to analyze the water quality of the treated water, it was commissioned by Dasan Life Science Co., Ltd., Hwasun-gun, Jeonnam, and water quality analysis was performed under the same conditions. The result of analyzing the treated water was as shown in Table 2 below.

As can be seen from the analysis results of Table 1 and Table 2, about 2,600 CFU / mL of general bacteria were detected in water before nanobubble treatment, and 170 CFU / mL of water after nanobubble treatment. This means that when the method according to the present invention is carried out, the sterilizing effect is about 96% or more with respect to the original raw water.

In addition, turbidity was found to be 1.03 NTU in the first raw water, while turbidity was found to be 0.28 NTU in later treated water, which indicates that the drinking water had a turbidity of 1 NTU or less.

In the case of the odor test which was judged sensually after heating the sample at about 50 ° C., rotting odor was felt in the original raw water, but in the treated water subjected to the nanobubble treatment by the method according to the present invention, three months passed. It can be seen that there was no peculiar smell.

In addition, when comparing the concentration of dissolved oxygen in water, it was found that the dissolved oxygen in the first raw water was 2 ppm, whereas in the case of the nanobubble treated water treated by the method according to the present invention, it was 8 ppm.

As a result, this means that the method of the present invention is very effective in the sterilization of harmful microorganisms in water such as green algae and red tide, and also improves turbidity, eliminates odor causes and increases the concentration of dissolved oxygen, ultimately aerobic microorganisms. It is a very eco-friendly natural purification method that helps the growth of aquatic plants, aquatic plants, fish, daphnia, etc. and removes eutrophic elements. Also, it uses natural air to manufacture separate chemicals for water quality improvement. There is no need for input, which means it is a very economical way.

Although the removal method of green algae and the like according to the present invention has been described in detail, this is only for describing the most preferred embodiment of the present invention, and the present invention is not limited thereto, and the scope thereof is defined by the appended claims. Determined and defined.

In addition, anyone of ordinary skill in the art will be able to make various modifications and imitations by the description of the specification of the present invention, but it will be apparent that this is also outside the scope of the present invention.

100: fine bubble generator, 110: bamboo filter member,
112: bamboo fibrous layer, 120: fixing member,
122: front cap, 124: rear cap,
125: packing, 126: connecting rod,
130: gas supply member, 131: internal gas passage,
132: body portion, 134: coupling portion,

Claims (3)

A bubble generator for generating nanobubbles is deposited in water,
After supplying air or oxygen gas from the external gas supply to the inside of the bubble generator through the connection at a pressure above atmospheric pressure,
By converting the air or oxygen gas through the bamboo filter member of the bubble generator is converted into nanobubbles in water,
The method of removing the green algae and red algae, characterized in that the nanobubbles remove the green algae or red algae in water.
The method of claim 1,
The nanobubble is a method of removing green algae and red algae characterized by further increasing dissolved oxygen in water.
The method of claim 1,
The bubble generator removes the green algae and the red algae characterized in that to form a single bubble assembly by tying a plurality of numbers, using the bubble assembly.

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