KR20010048041A - Electro-flotation based method of removing red tide plankton and chlorophyat and apparatus for the same - Google Patents

Abstract

PURPOSE: A method for removing red tide or green algae using electro-flotation and apparatus therefor are provided to remove red tide and green algae, suspended solid, VOC (volatile organic compounds) and odor by coagulation being brought about electric field and floating by nitrogen gas generated. CONSTITUTION: The apparatus consists of many electrodes (30) fixed by fixing bars (34a, 34b, 34c, 34d) and installed at the bottom of a buoyancy plate (20); a power supply part (10) supplying direct voltage into electrodes (30) for forming electric field between electrodes; the buoyancy plate (20) for floating the apparatus.

Description

Removal method of red tide and green algae using electric flotation and device for the same {ELECTRO-FLOTATION BASED METHOD OF REMOVING RED TIDE PLANKTON AND CHLOROPHYAT AND APPARATUS FOR THE SAME}

The present invention relates to red tide or green algae removal, and more particularly, to a red tide / green algae removal apparatus and method for removing red or green algae using the principle of electrical injury.

As a result of the massive breeding of the environment where plankton is suitable for breeding, the variety of pigments of the plankton causes the color of solution to turn red, green, and brown, which is called red tide, green tide, and brown tide. Also called). In general, red algae occur mainly in the oceans and green algae usually occur in freshwater lakes and rivers.

These algae usually grow in independent nutrients so that red algae are made up of flagella or diatoms. In other words, it grows with the help of solar energy using nitrogen and carbon dioxide in the water. Nitrogen in water is a protein source, carbon dioxide is an organic material, phosphorus (P) is an energy source. The polluted water is rich in nitrogen (NH ₄ ⁺ ) and phosphorus (P) and grows using the decomposition of polluted organic matter or carbon dioxide introduced from the air.

The growth of algae is another source of organics (pollutants) and the water is increasingly polluted. This phenomenon is called eutrophication. The more eutrophic water is, the more vicious the algae are, causing a highly toxic substance.

There are various kinds of algae, such as toxic and less toxic, but in particular, the toxins produced by algae generated in a relatively polluted area are problematic. These red algae are decomposed by microorganisms due to the death of phytoplankton, which consumes oxygen dissolved in seawater, resulting in a lack of dissolved oxygen. It is difficult to swim, phytoplankton blocks gills and suffocates the fish and shellfish, and toxic plankton among the plankton to damage not only fish and shellfish but also people.

Red tide is a phenomenon that occurs mainly in tropical and subtropical waters, but in addition to environmental pollution, the frequency of occurrence in Korea's waters has recently become more frequent, destroying ecosystems and severely damaging coastal fishing. Therefore, by removing the algae that cause these toxic substances can reduce the damage of aquaculture farms, such as due to red tide.

Accordingly, in order to prevent the red tide phenomenon, various preventive measures and solutions have been sought. Currently known as red tide prevention technology is largely using microorganisms, natural enemies, and physical and chemical methods. The previous two technologies are still considered premature to be put to practical use, and the physical and chemical red tide removal methods are considered to be the most practical.

As a physical method, all the wastes and pollutants in land and aquaculture are settled in the sedimentary layer and decay and decompose, consuming dissolved oxygen and generating various toxic substances. Therefore, a method of dredging or grinding these sedimentary layers is needed. Thus, it is a way to prevent the occurrence of red tide in advance. However, this method may have some effects when the target area is small, but the effectiveness of the method is poor in the case of a large ocean.

As a chemical method, first of all, a chemical coagulant method, an ocher spray method (clay adsorption method), an iron adsorption method, an ozone method, an ultrasonic treatment method, and a bio-control method are examined as a method of spraying and removing chemicals on the ocean where red tide has occurred. . One of the methods widely used at present is the red clay spraying method which sprays the red tide causative agent, a liquid treatment agent composed of ocher and limestone, which adsorbs plankton and settles on the bottom. However, ocher spraying is not a restrictive and fundamental measure, and sedimentary ocher and red algae have the problem of destroying the bottom ecosystem.

On the other hand, it is no exaggeration to say that there is virtually no method of removing algae from the lake. It is possible to temporarily remove copper sulfate (CuSO4), but only a temporary effect is achieved by heavy metal administration.

In view of the above problems of the prior art, the first object of the present invention is to provide a red tide / green algae removal device which is excellent in performance and can be easily manufactured at low cost based on the principle of electric injury.

It is a second object of the present invention to provide a method for removing red tide generated in the sea using a red tide / green tide removing device according to the first object.

A third object of the present invention is to provide a method of blocking green algae from entering the water of the intake station by using the red tide / green algae removing device according to the first object.

1 is a view for explaining the principle of the electrocoagulation method.

2A, 2B and 2C are a perspective view, a side view, and a cross-sectional view of a red tide / green algae removing apparatus using an electric injury according to a preferred embodiment of the present invention, respectively.

Figure 3a, 3b, 3c is a perspective view, a plan view and a side view for explaining a method for removing the red tide generated in the sea using a red tide removing device according to a preferred embodiment of the present invention with a ship.

Figures 4a and 4b is a view for explaining a method for removing the green algae flowing into the water intake using the green algae removal apparatus according to a preferred embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

10: power supply unit 20: buoyancy plate

22: coupling rod 24: coupling hole

30: electrode plate 34a, 34b, 34c, 34d: fixing bar

36: electrical connector 100: red / green algae removal unit

200a, 200b: Driving vessel 300, 500: Inhaler

310a, 310b, 310c, 310d: connecting rope

510: suction pump 600: water intake tower

610: intake pipe

As a first aspect for achieving the above object, a plurality of electrode plates for receiving a DC power supply to form an electric field, and a power supply means for supplying a DC power so that the plurality of electrode plates alternately charged to the positive electrode and the negative electrode; And a lower surface of the plurality of electrode plates are integrally coupled with each of the plurality of electrode plates so that the plurality of electrode plates are vertically and parallelly suspended at regular intervals, and the power supply means is seated on the upper surface, and the electrode plate and the power supply means are coupled to each other. It is provided with a buoyancy member to provide buoyancy to float in the water in a state, provided that the red tide or green tide is agglomerated by the electric field formed between the plurality of electrode plates floating on the surface of the water. do.

Preferably, the removal device further includes suction means for sucking and removing the red tide or the green tide floated on the surface of the water.

In addition, both side walls of the buoyancy member is formed with a coupling rod and a coupling hole, respectively, to connect a plurality of red / green algae removal device to make a long red / green algae removal device. A fixing bar for fixing the electrode plate spacing of the plurality of electrode plates connects the plurality of electrode plates.

As a side for achieving the second object, a plurality of electrode plates for forming an electric field by receiving a DC power supply, a fixing bar for fixing the electrode plate spacing of the plurality of electrode plates, and the plurality of electrode plates alternate A power supply means for supplying a direct current power supply to the anode and the cathode to a cathode and a cathode; and a bottom surface of the plurality of electrode plates is integrally coupled with each of the plurality of electrode plates so that the plurality of electrode plates are suspended in parallel at regular intervals. A supply means is seated and has a buoyancy member that provides buoyancy to float in water while the electrode plate and the power supply means are coupled to each other, and the red tide is agglomerated by an electric field formed between the plurality of electrode plates to rise above the water surface. At least one unit connected to make a red tide removing device, and the red tide removing device There is provided a method for removing a red tide by injecting the transport vessel into the area where the red tide has occurred while driving a suction device for sucking and removing the red tide floated on the water surface by the red tide removing device.

Furthermore, as a side for achieving the third object, a plurality of electrode plates for forming an electric field by receiving a DC power supply, a fixing bar for fixing the electrode plate spacing of the plurality of electrode plates, and the plurality of electrodes Power supply means for supplying a direct current power so that the plate is alternately charged to the positive and negative poles, and the lower surface is integrally coupled with each of the plurality of electrode plates so that the plurality of electrode plates are suspended in parallel at regular intervals, the upper surface The power supply means is seated, provided with a buoyancy member to provide a buoyancy to float in the water in the state in which the electrode plate and the power supply means is coupled to the green algae agglomerated by the electric field formed between the plurality of electrode plates The green algae removing device is configured by connecting at least one unit to be floated upward, The device is installed so as to completely enclose the intake tower so that the raw water flowing into the intake tower must pass through the green algae removal device, and an algae suction device is installed between the green algae removal device and the intake tower to rise above the water surface by the green algae removal device. A green algae removal method is provided in which raw water from which green algae has been removed is introduced into the intake tower by suctioning and removing one green algae.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

Electro-agglomeration refers to the formation of an electric field by charging two aluminum conductors with a positive electrode and a negative electrode, polarizing impurities contained in water by the electric field so that they coagulate with each other, and at the same time, agglomerates of hydrogen gas generated by ionization of water It refers to the phenomenon of floating on the surface of the water. The impurities dissolved in the contaminated water can be removed by removing the impurities (sludge) that floated above the surface of the water.

1 is a view for explaining the principle of the electro-aggregation method, two aluminum electrode plates (2, 4) immersed in water in the tank (8) containing a lot of impurities are connected to the DC power supply to charge the anode and cathode This is as if a cell is formed. The various impurity particles contained in the water are also ionized by the electric field formed by the two electrode plates to be charged. The cathode 2 is oxidized while losing electrons and is eluted into water with Al ³⁺ ions. In addition, when the anode 4 receives the electrons generated from the cathode 2 and delivers the electrons into the water, the hydrogen ions in the water receive the electrons and are reduced to generate hydrogen gas. This can be summarized as the following formula (1).

Al ^-> Al ³⁺ + 3e -

2H ⁺ + 2e ^-- > H ₂ (g)

Al ³⁺ ions eluted from the water combine with the surrounding negatively charged colloidal material. At this time, as the hydrogen gas generated from the anode is released into the air, water disturbance occurs between the two metal plates. Neutralized colloidal materials, such as impurities contained in water, collide with each other due to water disturbance, causing aggregation to increase. Here, colloidal material is a generic term for suspended solids, including fine impurity particles, usually up to 0.1 μm or more of algae.

The flocks, which are agglomerated with fine impurities, are floated by a myriad of hydrogen gases that rise above the surface. The molecular weight of hydrogen is so small that the floating effect is particularly high (hydrogen molecular weight = 2 g / mol, water molecular weight = 18 g / mol). If the polarity of each of the two aluminum electrode plates 2 and 4 is alternately changed to the negative electrode and the positive electrode, there is no disturbance of current flow or contamination of the electrode by foreign substances generated at the positive electrode.

This principle can be applied to remove red and green algae. 2A, 2B and 2C are a perspective view, a side view, and a cross-sectional view of a unit device 100 for removing red tide / green algae based on the principle of electrocoagulation injury, respectively, according to a preferred embodiment of the present invention.

The apparatus 100 includes a buoyancy plate 20 which can float on water, a power supply unit 10 mounted on the upper surface of the buoyancy plate 20, and a plurality of electrodes suspended in parallel to the lower surface of the buoyancy plate 20. It has a plate 30.

The power supply unit 10 is configured as a DC supply device for applying a DC voltage to the plurality of electrode plates 30. The odd-numbered electrode plates 30a, 30b, 30c, 30d, 30e, 30f, and 30g are electrically connected to the cathode of the power supply unit 10 through the electrical connector 36, and the even-numbered electrodes are connected to the anode of the power supply unit 10. The electrode plates 30a, 30b, 30c, 30d, 30e, 30f, and 30g are electrically connected through the electrical connector 36. Thus, an electric field is formed between the electrode plates. The positive electrode and the negative electrode of the power supply unit 10 are alternately changed periodically so that the aggregated material is not adsorbed on the electrode plate 30. Therefore, the polarity of each electrode plate is switched every cycle.

Each electrode plate 30 is also coupled to mechanically hang side by side perpendicular to the bottom surface of the buoyancy plate 20. The upper and lower sides of the electrode plate 30 are provided with fixing bars 34a, 34b, 34c, and 34d to stably maintain the gap between the electrode plates, thereby integrally binding the electrode plates 30.

The buoyancy plate 20 has a high buoyancy so as not to be submerged in the water by overcoming the weight load acting on the electrode plate 30 and the power supply unit 10 and at the same time have a high strength and flexibility so as not to be damaged by the impact of waves do. For example, a synthetic resin with excellent strength and flexibility is made of a panel having an empty space therein, and styrofoam or hydrogen gas is injected therein to increase buoyancy.

In addition, both sides of the buoyancy plate 20 is provided with a plurality of coupling rods 22 and the same number of coupling holes 24 at corresponding positions of the coupling rods. The coupling rod 22 and the coupling hole 24 are used as a means for connecting the unit 100 to each other when trying to form a long train-type red tide / green algae removal device by connecting a plurality of the unit device (100).

When the device 100 is placed in the water where red tide or green tide is generated and operated, the red tide or green tide is agglomerated and flocculated sludge floats on the water surface. If the sludge floats properly by using a suction device, it is possible to effectively remove red or green algae contained in the water.

3A, 3B, and 3C are perspective, plan, and side views for explaining a method of removing red tide generated in the sea by using the above-described unit device 100 together with the driving vessels 200a and 200b.

A plurality of unit devices 100 are connected to each other to constitute a train-type red tide / green algae removal device 100 ', and the removal device 100' is connected to two driving vessels 200a and 200b ropes 310c and 310d. Connect using). In addition, a rear of the removal device 100 'is provided with an inhaler 300 for sucking agglomerated red tide sludge that has floated toward the water surface by the removal device 100' through the connecting ropes 310a and 310b. 200b). The inhaler 300 is provided with a filter (not shown) to filter out the agglomerated red tide sludge. In addition, a suction pump (not shown) may be used for quick removal of red tide sludge. The driving vessels 200a and 200b may be fixed or moved according to the state of the generated red tide 400 or the flow of algae.

4A and 4B are views for explaining a method for removing green algae flowing into a water intake using a green algae removing device configured by applying the unit device 100 described above.

The water intake pipe 610 installed in the water intake tower 600 for supplying raw water to the water purification plant is configured as a train-type red tide / green algae removal device 100 " by connecting a plurality of unit devices 100. Surround it completely. In addition, between the intake pipe 610 and the apparatus 100 "is provided with a suction pipe 500 for suctioning the flocculated green algae sludge floating on the water surface. The suction pipe 500 is agglomerated by installing a filter (not shown) It is possible to filter out the green algae sludge, and to connect the suction pump 510 for the rapid removal of the red algae sludge.

According to such a configuration, even though the green algae are included in the water flowing into the intake pipe 610, the green algae are agglomerated and floated on the water surface by the principle of the electroaggregation described above. The green algae sludge is introduced into the suction pipe 500 according to the flow direction of the water and is filtered out. As a result, green algae can be effectively removed before intake.

According to the red tide / green algae removal apparatus according to the present invention by using the effect of electrocoagulation and injury can be removed by floating only the red tide or green algae without disturbing the water. In particular, by installing this unit near the intake source, the green algae, suspended matter, volatile organic substances, tastes and odorous substances can be removed before intake, thereby improving the water quality of the raw water before the treatment and reducing the load on the purification plant. In addition, since the red tide can be effectively removed in a short time by entering the red tide occurrence area of the coastal sea, it can contribute to reducing the damage of fisheries caused by the red tide.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed within the scope of the present invention without departing from the spirit and scope of the invention described in the claims below. I can understand that you can.

Claims (6)

A plurality of electrode plates for forming an electric field by receiving DC power; Power supply means for supplying direct current power such that the plurality of electrode plates are alternately charged to the anode and the cathode; And A lower surface is integrally coupled with each of the plurality of electrode plates so that the plurality of electrode plates are suspended vertically and parallel at regular intervals, and the power supply means is seated on the upper surface, and the electrode plate and the power supply means are coupled to each other. With a buoyancy member to provide buoyancy to float in the water in the state, Red tide / green tide is a red tide / green tide removal device, characterized in that to rise on the surface of the water while agglomerated by the electric field formed between the plurality of electrode plates. 2. The red tide / green tide removing apparatus according to claim 1, wherein coupling rods and coupling holes are formed on both side walls of the buoyancy member to connect the plurality of red tide / green tide removing devices to form a long red tide / green tide removing device. . 2. The red tide / green tide removing device according to claim 1, further comprising a fixing bar for fixing an interval of the electrode plates of the plurality of electrode plates. 2. The red tide / green tide removing apparatus according to claim 1, further comprising suction means for sucking and removing the red tide or the green algae which floated on the water surface. A plurality of electrode plates for forming an electric field by receiving a DC power supply, a fixing bar for fixing the gap between the electrode plates of the plurality of electrode plates, and a plurality of electrode plates alternately supplying DC power so that the plurality of electrode plates are alternately charged to the anode and the cathode. A power supply means and a lower surface of the plurality of electrode plates are integrally coupled with each of the plurality of electrode plates so that the plurality of electrode plates are suspended in parallel at regular intervals, and the power supply means is seated on the upper surface of the electrode plate and the power supply. Red tide is removed by connecting at least one unit having a buoyancy member that provides buoyancy to float in the water while the supply means is coupled so that the red tide is flocculated by the electric field formed between the plurality of electrode plates and floats on the surface of the water. A device, which is floated on the water surface by the red tide removing device and the red tide removing device. While driving the suction holding device for removing by suction the crude Suspended from the transport vessel method for removing red tide charged into the transport vessel to the region where the red tide occurs. A plurality of electrode plates for forming an electric field by receiving a DC power supply, a fixing bar for fixing the gap between the electrode plates of the plurality of electrode plates, and a plurality of electrode plates alternately supplying DC power so that the plurality of electrode plates are alternately charged to the anode and the cathode. A power supply means and a lower surface of the plurality of electrode plates are integrally coupled with each of the plurality of electrode plates so that the plurality of electrode plates are suspended in parallel at regular intervals, and the power supply means is seated on the upper surface of the electrode plate and the power supply. Green algae are removed by connecting at least one unit having a buoyancy member that provides buoyancy to float in the water while the supply means is coupled and allowing the green algae to float on the water surface by agglomeration of the green algae by the electric field formed between the plurality of electrode plates. Device, and the green algae removal device is installed so as to completely enclose the intake tower. Raw water flowing into the algae must pass through the algae removing device, and an algae suction device is installed between the algae removing device and the water intake tower, and the green algae are removed by suctioning and removing the algae floating on the water surface by the algae removing device. Green algae removal method to allow raw water to enter the intake tower.