KR101028360B1 - Ballast water treatment device with electric disinfection grid using virtual electrodes - Google Patents

Abstract

The present invention relates to an electrode for treatment of ballast water or other waste water, etc. of a ship, and more particularly, a positive electrode by separating and arranging a positive electrode plate and a negative electrode plate having a predetermined shape in a specific direction from each other. The present invention relates to a lattice electrode and a water treatment system including the same, the structure of which is improved to form a virtual electrode of the liver to penetrate the microbial membrane and further perform electrochemical sterilization.

In the present invention, the conductive metal wires are arranged in a zigzag line in a plurality of rows side by side in a frame having an open central portion, and constitute a positive electrode plate and a negative electrode plate, respectively, wherein the conductive metal wires of the positive electrode plate and the negative electrode plate are formed. A plurality of grid electrodes arranged to face each other at right angles are arranged in series in the longitudinal direction of the pipe in the ballast water inflow and outflow pipe of the ship, and each of the grid electrodes is connected to a DC power source in a flow direction of the ballast water introduced thereto. Provided is a ballast water treatment apparatus using a virtual electrode, characterized by forming a continuous electrical and chemical sterilization action zone.

Positive electrode plate, negative electrode plate, frame, metal wire, virtual electrode, electrode point, ballast water, ballast water inflow and outflow pipe, DC power, DC voltage, DC current, microbial fluorescence meter, hydrogen gas detector

Description

Ballast water treatment device using virtual electrodes {Ballast water treatment device with electric disinfection grid using virtual electrodes}

The present invention relates to an electro-sterilization grid electrode for the treatment of seawater and other waste water, and more particularly, to effectively remove microorganisms, etc. contained in seawater with a low voltage and low current DC power supply, The present invention relates to a lattice electrode for water treatment using a virtual electrode having an improved structure so as to simultaneously obtain an effect of chemical sterilization by hypochlorite generated by electrolysis.

To protect the coastal ecological environment by minimizing the movement of harmful aquatic objects and pathogens by ballast water and to protect the health of the general public, the International Maritime Organization has enacted and promoted various regulations for the treatment of ballast water since 1997. Is coming. Currently, ballast water treatment methods for the sterilization of microorganisms less than 50 microns in size, phytoplankton, zooplankton, E. coli, E. coli, toxic vibrio cholera, etc. include filtering, chlorine disinfection, ultraviolet disinfection, ozone disinfection and electrolysis. Sterilization methods are used.

In the case of using mechanical filtering, it is necessary to use a very expensive filter to filter 5-10 microns in size, and the maintenance cost due to corrosion or clogging of the filter membrane is expensive. In addition, this method has a problem that can not remove pathogens, such as bacteria.

US Pat. No. 5816181 (US patent No. 5816181) proposes a method of heating ballast water with ship engine heat. Maintaining ballast water for a certain amount of time from 35 to 45 degrees Celsius can kill large organisms such as small fish, but small microbial killings are incomplete. This method has a low cost of microbial killing as well as an additional heat source, heat exchanger, pump and complicated piping equipment.

As a chemical water treatment method, chlorine dioxide is widely used as a biocide. As a chemical killing method, US Patent No. 6736,511 (US patent No. 6773611) proposes a method for automatically controlling the concentration of chlorine dioxide in the ballast tank with a chlorine disinfection device. These chemical water treatment methods require facilities to load powder or liquid biocides into the vessel, add them to the ballast water pipeline and mix them, or to produce strong active oxidized samples on the vessel. Such a facility becomes a very complex chemical process processing system and requires considerable facility space and management, the biggest problem being that it produces chlorine oxides or acid by-products that adversely affect the coastal ecosystems and is an additional to prevent the release of these by-products. Need a device.

The gas type biocide is ozone, for example, and US Patent No. 6125778 (US patent No. 6125778) proposes a method of water treatment of ballast water by producing ozone on a ship. Since ozone is harmful to the human body, it is necessary to devise a way to prevent undissolved ozone from being released into the atmosphere when the ballast water is released. In the case of the ozone method, microorganisms having a large size cannot kill.

US Patent No. 7005074 introduces a method for sterilizing ballast water using UV ultraviolet light. However, UV ultraviolet killing is difficult to operate in turbid seawater, and microbial killing is not very efficient.

US Patent No. 6800206 (US Patent No. 6800206) proposes an electrolytic sterilization method. Here, we disclose a method of killing microorganisms and cells in water with ions generated by electrolysis.

US Patent No. 7244348 (US Patent No. 7244348) proposes an apparatus for preparing hypochlorite chemical biocides by electrolyzing seawater while a ship is sailing. This method of electrolysis of seawater generally requires a high voltage power supply and has the additional problem of not only generating chlorine oxide harmful to the natural environment but also safely removing hydrogen generated by electrolysis of water.

The present invention is to provide an effective electrode treatment electrode structure and a water treatment system using the same that can remove microorganisms, bacteria and other organisms present in the water without the side effects as described above in the conventional example.

That is, an object of the present invention is to provide a low-power, simple installation and maintenance, and low manufacturing and management costs, and can effectively remove microorganisms, bacteria and other harmful organisms in the water even with a small installation space To provide a structure and a water treatment system having such an electrode structure.

The present invention has been conceived to solve the above-mentioned conventional problems, and in the present invention, the conductive metal wires are arranged in a zigzag side by side in a plurality of rows in a frame having an open central portion, and constituted of a positive electrode plate and a negative electrode plate, respectively. However, a plurality of grid electrodes are arranged in series in the longitudinal direction of the pipe in the ballast water inlet and outflow pipes of the ship so that the conductive metal lines of the positive electrode plate and the negative electrode plate face each other at right angles to each other. Ballast water treatment apparatus using a virtual electrode is characterized in that the electrode forms a continuous electric and chemical sterilization action region in the flow direction of the water to be introduced by being connected to the DC power source.
Here, a set of lattice electrodes composed of the positive electrode plate and the negative electrode plate is installed at right angles to the flow direction of the water to be treated in the pipe, and between the positive electrode plate and the negative electrode plate in the set of lattice electrodes. It is provided so that the space | interval d is smaller than the space | interval D between adjacent grid electrodes.
At this time, the interval d between the positive electrode plate and the negative electrode plate is such that the time for the untreated water flowing between the positive electrode plate and the negative electrode plate to be at least 1 ms (0.001 second). Preferably, the spacing D between the lattice electrodes is formed such that the time at which the ballast water passes through the corresponding section is at least 10 ms (0.01 second).
In addition, it is preferable that the voltage and the current are respectively supplied to the grid electrode such that the DC voltage of the DC power supply is at most 50 Volt and the DC current is at most 10 mA / cm ² .
On the other hand, at least one of the front or rear side of the grating electrode is preferably provided with a microbial fluorescence meter that can monitor the concentration of the microorganisms contained in the water to be treated flowing in the pipe.
In addition, it is more preferable that a hydrogen gas detector is provided on the rear side of the lattice electrode to monitor the concentration of hydrogen gas by electrolysis of the water to be treated. At this time, when the concentration of the hydrogen gas detected by the hydrogen gas detector is more than a predetermined value it will be preferable to automatically adjust the current of the DC power supply.

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The lattice electrode of the present invention has the advantage of being simple in structure, low in manufacturing cost, and effectively removing microorganisms, bacteria, and other harmful organisms contained in water to be treated, such as ballast water, and various wastewaters, even with low power consumption. have. Therefore, it is very excellent in terms of energy efficiency and very economical in terms of production cost.

In particular, since the grating electrode of the present invention can be easily installed in a ballast water inlet / outlet, etc., no separate facility for water treatment is required, and the installation space is small, and thus space-efficient.

In addition, it is a method of killing and removing living organisms by punching holes in the membranes of living organisms, and by implementing low voltage and low current, it is possible to prevent the generation of environmental pollutants, and the effect of removing microorganisms is immediate.

In addition, the grid electrode of the present invention and the water treatment system using the same can be widely applied not only to ballast water treatment, but also to the treatment of feces on ships or water purification of general living water, wastewater and sewage.

The present invention is an electroporation method that destroys cell membranes by using an electric field formed by flowing a DC current in seawater and hypochlorite having strong oxidation activity from electrolysis of seawater by DC current. It relates to a device for sterilizing the back. In the present invention, the sterilization apparatus is provided with a positive and negative electrode plate made of conductive wires in a ballast water inlet and outlet pipe at appropriate intervals, and a voltage is applied thereto so that current flows in the entire space between the positive electrode plate and the negative electrode plate. It is a device that destroys all microorganisms and bacteria in seawater by electric shock and hypochlorite reaction.

By repeating the above-mentioned cathode electrode plate, all microorganisms in the seawater are completely killed during the flow of the treated water, and the processing of the treated water is performed only when the ballast water is intake and discharged. This is the least power consuming and efficient than any existing device, and is installed in the treated water flow pipe, eliminating the need for a separate device space.

The present invention is a hypochlorite produced by electroporation and electrochemical reaction of sodium chloride in seawater, which makes it possible to kill germs such as seawater, wastewater, microorganisms and coliforms in sewage with a DC voltage of 50 Volt or less and a current density of 10 mA / cm ² . The present invention relates to an electrosterile grating electrode for forming a three-dimensional virtual electrode and a water treatment system using the same.

In molecular biology, electroporation is used when biological probes or drugs need to be injected into cells. That is, when a potential difference of 1 Volt or more occurs around the non-conducting cell membrane, a hole is formed in the cell membrane due to insulation breakdown, and at this time, a biological probe or a drug is injected into the hole. In this case, the hole opening described above should be instantaneous, and the cell will die if the voltage is continuously applied.

The present invention is to sterilize microorganisms using this phenomenon. In other words, by flowing a current to the seawater as a conductor at a low voltage to generate a potential difference of 1 volt or more around the non-conductive cell membrane to insulate and destroy the cell membrane of the cell to kill the microorganisms permanently. In general, since the thickness of the cell membrane is only a few microns, it is experimentally destroyed even with a potential difference of 1 Volt.

In the present invention, in addition to the means for removing microorganisms by the electric field, sodium chloride in seawater is electrochemically reacted at low voltage to minimize the generation of hydrogen, while hypochlorous acid (ClO) is strongly oxidized to organic materials. ) To further kill microorganisms, E. coli, etc.

1 is a block diagram of a grid electrode consisting of a pair of a positive electrode plate and a negative electrode plate of the present invention, Figure 2 is a water treatment in which the grid electrode is installed in series in the ballast water inlet and outlet pipe according to an embodiment of the present invention A partially cutaway perspective view of the system, FIG. 3 is a power supply connection diagram of the positive electrode plate and negative electrode plate of the present invention. As shown, the grating electrode 100 of the present invention is composed of a positive electrode plate 110 and a negative electrode plate 120, the positive electrode plate 110 is a conductive metal wire 114 coplanar The negative electrode plate 120 is configured to be arranged to be connected side by side up and down, and the conductive metal wires 124 are arranged to be connected side by side on the same plane. The grid electrode 100 is negatively connected to the positive electrode plate and the negative electrode plate 120 so that the metal wire 114 of the positive electrode plate 110 and the metal wire 124 of the negative electrode plate 120 are orthogonal to each other when introduced into an actual water treatment process. The electrode plates are arranged to be spaced apart from each other. Here, the metal wires 114 and 124 of the lattice electrode are preferably selected from silver nickel, chromium, stainless steel, titanium, iridium, and alloys thereof having excellent corrosion characteristics.

In the present invention, the positive electrode and the negative electrode are not formed on the same plane, but fixed to each of the other frames 112 and 122, and the positive electrode plate 110 and the negative electrode plate 120 are disposed inside the ballast water inlet and outlet pipe 200. Install at intervals. By adjusting the distance between the positive electrode plate 110 and the negative electrode plate 120, a sufficient residence time can be secured so that microorganisms or bacteria in seawater or sewage can interact with the flow of electric current. By adjusting the spacing between the substrates, DC voltage and current flow are controlled to produce satisfactory biocidal effects without electrolyzing large amounts of water. When the positive electrode plate 110 and the negative electrode plate 120 are alternately installed to form 90 degrees to each other, the resistance value of the seawater at the intersection where the gap between the positive metal wire 114 and the negative metal wire 124 is the closest 90 degrees Since is the lowest, the Ohm's law flows the most current to form a virtual electrode. As the current flows freely around the left and right neighboring electrodes around the virtual electrode, the same average current flows in the entire space, and microorganisms or bacteria are destroyed by an electric shock with a DC voltage of 50 Volt or less and a current density of 10 mA / cm ² . To be killed. When the lattice electrode 100 including a pair of positive and negative electrode pairs is provided in duplicate, the microorganisms that do not die while passing through the first electrode lattice are the second, third, fourth, and so forth. It is completely removed through the electrode. At the same time, in the present invention, a low voltage and a low current are applied to the electrode, in which sodium chloride in seawater generates an electrochemical reaction to generate hypochlorite having strong oxidation activity, thereby oxidizing organic microorganisms to further kill harmful organisms such as microorganisms. do.

Zimmerman, et al (Zimmerman, U., G. Pilwat, and F. Riemann, “Dielectric breakdown of cell membranes”, Biophys. J. 1974 Nov; 14 (11): 88199.), Have about 1 Volt around the microbial cell membrane. If the above potential difference is found, a hole is formed in the cell membrane by dielectric breakdown, and the contents of the cell flow out of the cell by electric permeabilization and the microbial tissue is destroyed.

Sodium chloride (NaCl) and other salt ions are dissolved in the seawater, which leads to good electrical conductivity. For example, the average electrical conductivity of 20 degrees Celsius and 30 ppm salinity is 35400 S / cm, about 30 Ohm / cm . When a direct current is applied for about 1 ms (0.001 sec) at a current density of less than about 10 mA / cm ² in the inflow and outflow pipes of seawater connected to the ballast tank, the microorganisms in the seawater are completely killed. Therefore, the interval between the positive and negative electrode plates 110 and 120 may be determined such that the flow rate of seawater passes through the positive and negative electrode plate plates 110 and 120 to be 1 ms (0.001 second) or more.

In the present invention, a plurality of positive and negative points are not provided on one electrode substrate, and water treatment is not carried out. Instead of producing infinite positive and negative points as actual electrodes, the metal wires are arranged in one direction as shown in FIG. 1. As shown in FIG. 2, the positive electrode plate 110 and the negative electrode plate 120 are staggered 90 degrees perpendicular to each other in the water to be treated pipe 200 as shown in FIG. 2.

4 is a schematic view showing an example of a virtual electrode formed by the lattice electrode of the present invention. In the drawing, the points on the metal line 124 of the negative electrode plate 120 corresponding to A, B, and C on the metal line 114 of the positive electrode plate 110 are A ', B', and C '. That is, when the line is drawn down on the metal line 124 of the negative electrode plate 120 at the points A, B, and C on the metal line 114 of the positive electrode plate 110, the points where A " 'Becomes a point. Therefore, the straight lines AA ', BB' and CC 'face each other at right angles, and the distance is the shortest, and therefore the seawater resistance on this path is the lowest, so the current flows the most. That is, A and A ', B and B', and C and C 'function as an electrode point. In the present invention, many virtual electrode points are implemented by installing metal grids in the form of a linear grid, which is easy to manufacture, without actually manufacturing a large number of point electrodes. In 4, G is the middle of A, B, G 'is the intersection of AB' and BA '.

5 is a graph showing the current flow between the virtual electrode and the neighboring electrode according to the present invention, Figure 6 is a view of forming a virtual electrode between the positive electrode plate and the negative electrode plate of the present invention. In FIG. 5, the straight line descending from the upper left to the lower right indicates a current magnitude flowing to the negative point A 'and the virtual virtual point B' of A ', which are perpendicular crossing points on the negative metal line, based on the positive point A of FIG. 4. Since the maximum current i2 flows between AA 'and the distance between the virtual electrode points B' adjacent to A 'in A' is large, a current i1 having a large resistance and smaller than i2 flows. In FIG. 4, the current flows from the virtual electrode A of the anode to the virtual electrode B ′ of the cathode, and the current flows from the virtual electrode B of the anode to the virtual electrode A ′ of the cathode. Since the current field is an open field, as shown in FIG. 6, current flows from the electrode point A of the anode to the negative virtual electrode points B ', C', D '... Only the current flow up to is shown in FIG.

Since the current flows in all directions from each electrode point of the anode to all electrode points of the cathode, the average integrated current in each current field is constant as the integrated current i = i1 + i2 as shown in the example of FIG. Able to know. This constant current flows in the total volume formed by the positive electrode plate 110 and the negative electrode plate 120 inside the double ballast water inlet and outlet pipe, so that microorganisms passing through this region are formed in the electric field formed by the flow of current. Is killed by dielectric breakdown by a potential difference of at least 1 Volt between and inside the cell membrane.

7 is a schematic longitudinal cross-sectional view of a water treatment system according to an embodiment of the present invention, and FIG. 8 is a schematic longitudinal cross-sectional view of a water treatment system according to another embodiment of the present invention. In the installation of the positive and negative electrode plates of FIG. 7, the distance D between the positive and negative electrode plate spacing d and the pair of lattice electrodes 100 is determined by considering the flow rate in the conduit of the ballast water treatment apparatus. It is set to have a sufficient contact time so that the sterilization action by the electroporation method can take place by being sufficiently exposed to. For example, the interval 'd' in FIG. 6 is such that the flow rate of the actual positive and negative electrode plates 110 and 120 of the ballast number is at least 1 ms (0.001 sec), and the interval of D allows a delay time of 10 ms. Set the interval. In order to impose a current density of at least 10 mA / cm ² in the electric field, the larger the above-mentioned intervals 'd' and 'D' are adjusted so that the applied DC voltage becomes higher.

28 grams / liter of sodium chloride is usually dissolved in seawater, which not only increases the electrical conductivity but also causes electrochemical reaction of sodium chloride as shown in the following chemical formula. It generates sodium hypochlorite (NaOCl) and hydrogen gas. The main chemical equation of this reaction is as follows.

NaCl + H ₂ O + 2e- → NaOCl + H ₂

Hypochlorite (ClO) generated by this electrochemical action ) Kills microorganisms such as microorganisms and E. coli in addition to the electroporation method described above. As shown in the above chemical formula, hydrogen gas is also generated during the chemical reaction. Since the generation rate of hydrogen gas is proportional to the current density, the hydrogen gas is monitored by the hydrogen gas detector 310 of FIG. / 40, that is, the current is automatically adjusted by the DC power supply (DC Power Supply) 300 so that more than 0.1% does not occur. This trace amount of hydrogen gas enters the ballast tank along the flow of the ballast water and then is discharged to the outside through the ballast tank exhaust. The hydrogen gas detector 320 is preferably provided at the rear side of the grating electrode 100.

As described above, the present invention kills germs such as microorganisms in the seawater, wastewater and filthy water, E. coli and the like by electroporation and hypochlorite. When a group of lattice electrodes 100 does not completely kill microorganisms, as shown in FIG. 7, a plurality of lattice electrodes 100 may be arranged in series at intervals of D.

It is preferable to install a microbial fluorescence detector 320 on the front side, the rear side, or both of the grating electrodes 100 serving as the biocidal functions. The microbial fluorometer measures the concentration of microorganisms in the ballast water inlet and outlet pipe 200 to automatically adjust the appropriate voltage and current density required for each grid electrode 100 in the DC power supply 300. . At this time, the interval between the grid electrode 100 of each group is preferably set so that the microorganism can stay in the electric field for 10 ms regardless of the flow rate of the ballast water flowing in and out. In addition, the DC voltage supplied to the grid electrode 100 can be adjusted to a desired value.

All living tissues contain nicotinamide adenine dinucleotides (NADHs), which help metabolism, and when these NADHs are irradiated with ultraviolet light at 340 nm, they fluoresce at 460 nm. By using the intensity of the fluorescence it is possible to monitor the concentration of infiltration concentrations of microorganisms, E. coli and the like.

The microbial fluorescence meter 320 provided on the rear side of the grating electrode 100 monitors the microbial killing result and if the removal result of the microorganism is not satisfactory, add the number of the grating electrodes 100 or increase the applied current density. Makes the killing of microorganisms and pathogens more perfect.

When the ballast water is discharged, the ballast water is preferably discharged in a direction opposite to the inflow direction of the ballast water, as shown in FIG. 8, in order to remove debris from the electrode plates 110 and 120 of the lattice electrode 100.

As described above, according to the present invention, a plurality of grid electrodes 100 are installed in a ballast water inflow pipe, and microorganisms in seawater have a low voltage below DC 50 Volt and a low current of 10 mA / cm ² by electroporation. It relates to a device for killing germs. At the same time, the present invention relates to a device that additionally kills microorganisms, pathogens, etc. with hypochlorous acid generated by electrochemical action of sodium chloride in seawater as a result of applying current to seawater.

The present invention is particularly effective against E. coli harming organisms and public health such as zooplankton, phytoplankton, zebra mussel, etc. in other regions that destroy local ecosystems introduced by ballast water of large transport vessels. The present invention relates to an apparatus for sterilizing seawater such that Escherichia coli, Vibrio cholerae, and the like fall below a standard set by the International Maritime Organization. In particular, low power consumption saves energy and minimizes operating costs. In addition, a biocidal reaction zone consisting of a plurality of electrode plates can be installed inside the ballast water inlet / outlet pipe, which requires no additional installation space. It is an advantage that there is little burden on ship propulsion energy due to the load.

The electroporation method employing the grid electrode 100 for water treatment using the virtual electrode of the present invention can be utilized not only for the water treatment of the ballast tank, but also for the treatment of excreta on a ship, or for purification of general living water, waste water, and sewage. In addition, since the water treatment system of the present invention can be installed inside the ballast inflow pipe, it does not require a separate system space, and it does not always operate, and only needs to operate only when the ballast water is input and output.

9 and 10 are configuration diagrams of the grid electrodes 101 and 102 modified according to another embodiment of the present invention. Reference numerals 114a, 114b, 114c, and 114d in the drawing denote metal lines constituting the positive electrode plate, and 124a, 124b, 124c, and 124d denote metal lines constituting the negative electrode plate. In the embodiment of FIG. 1, the wires 114 and 124 are arranged in the frames 112 and 122 to complete by arranging one strand of wires in a zigzag pattern from the beginning to the end. A plurality of branch lines 114a, 114c, 124a, and 124c extend from 114d, 124b, and 124d. That is, in FIG. 9, in the case of the metal line constituting the positive electrode plate, a plurality of branch lines 114a extending from the main line 114b are disposed up and down side by side, and in the case of the metal line constituting the negative electrode plate, the main line 124b is disposed in the negative line. A plurality of branching lines 124a extending side by side are arranged side by side. In FIG. 10, similar to the case of FIG. 9, the main lines 114d and 124d form a closed loop and a plurality of branch lines 114c and 124c are arranged in parallel. In the case of FIG. 1, the metal wires 114 and 124 have a series connection structure consisting of one strand, and a voltage drop occurs at an end portion thereof. However, as shown in FIGS. 9 and 10, when branched into a plurality of strands from one or more main lines 114b, 124b, 114d, and 124d in a parallel series structure, each branch line 114a, 124a, 114c, and 124c is used. The voltage drop does not occur, so power loss can be minimized.

The present invention is for the treatment of seawater, sewage, wastewater and other water to be treated, and its structure is simple and low power, so that the present invention can be applied to water treatment of onshore or offshore facilities or operating engines, and in particular, connected to ballast tanks such as ships. When installed in the incoming and outgoing pipe, etc., it is possible to maximize the efficiency of seawater treatment. Therefore, the present invention is expected to be widely used for land and sea wastewater treatment due to its simple structure, low production cost, and high removal efficiency.

1 is a configuration diagram of a lattice electrode of a pair of a positive electrode plate and a negative electrode plate of the present invention.

2 is a partial cutaway perspective view of a water treatment system in which a grid electrode is installed in series in a ballast water inlet and outlet pipe according to one embodiment of the present invention;

3 is a power supply connection diagram of a positive electrode plate and a negative electrode plate of the present invention;

Figure 4 is a schematic diagram showing an example of a virtual electrode formed by the grating electrode of the present invention.

5 is a graph showing the current flow between the virtual electrode and the neighboring electrode according to the present invention.

Figure 6 is a virtual electrode formation between the positive electrode plate and the negative electrode plate of the present invention.

7 is a schematic longitudinal cross-sectional view of a water treatment system according to one embodiment of the present invention.

8 is a schematic longitudinal sectional view of a water treatment system according to another embodiment of the present invention.

9 and 10 are schematic diagrams of a modified grid electrode according to another embodiment of the present invention.

Claims (8)

Conductive metal wires are arranged side by side in a zigzag in a plurality of rows in a frame having a central opening, and each is composed of a positive electrode plate and a negative electrode plate, wherein the conductive metal wires of the positive electrode plate and the negative electrode plate are perpendicular to each other. A plurality of grid electrodes spaced apart to face each other are arranged in series in the longitudinal direction of the pipe in the ballast water inflow pipe of the ship, and each of the grid electrodes is continuously connected to the flow direction of the water to be treated by being connected to a DC power source. And a ballast water treatment apparatus using a virtual electrode to form a chemical sterilization action region. The method of claim 1, The set of lattice electrodes composed of the positive electrode plate and the negative electrode plate is installed at right angles to the flow direction of the water to be treated in the pipe, and the gap between the positive electrode plate and the negative electrode plate in the set of grid electrodes ( Ballast water treatment apparatus using a virtual electrode, characterized in that d) is provided to be smaller than the distance (D) between the adjacent grid electrodes. The method of claim 2, The distance d between the positive electrode plate and the negative electrode plate is formed such that the time for the water to be processed to flow between the positive electrode plate and the negative electrode plate is at least 1 ms (0.001 sec). The spacing D between the grid electrodes is a ballast water treatment apparatus using a virtual electrode, characterized in that the time for the ballast to pass through the interval is at least 10ms (0.01 seconds). The method according to any one of claims 1 to 3, Ballast water treatment apparatus using a virtual electrode characterized in that the voltage and current are supplied to the grid electrode so that the DC voltage of the DC power supply is not more than 50 Volt, the DC current is not more than 10 mA / cm ² , respectively. The method according to any one of claims 1 to 3, Ballast water treatment using a virtual electrode at at least one of the front or rear side of the grating electrode is provided with a microbial fluorescence measuring device for monitoring the concentration of the microorganisms contained in the water to be flowed into the pipe; Device. The method according to any one of claims 1 to 3, Ballast water treatment apparatus using a virtual electrode on the rear side of the grid electrode is provided with a hydrogen gas detector for monitoring the concentration of hydrogen gas by the electrolysis of the water to be treated. The method of claim 6, Ballast water treatment apparatus using a virtual electrode characterized in that the current of the DC power supply is automatically adjusted when the concentration of hydrogen gas detected by the hydrogen gas detector is a predetermined value or more. delete

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